Aygul Dovletova
Founder & Maintainer
Aygul builds ZeroUtil as a privacy-first alternative to the sea of ad-heavy tool sites. Every utility on ZeroUtil is designed to run entirely in the browser — no uploads, no accounts, no tracking beyond basic usage analytics. Background in full-stack web engineering with a focus on fast, minimal interfaces.
Articles by Aygul Dovletova
AES-GCM vs AES-CBC: Which Mode to Use and Why
What block cipher modes do, why GCM has mostly replaced CBC for new code, the IV and authentication rules that matter, and where each mode still earns its place.
Flesch-Kincaid Explained: What the Score Means and How to Use It
How the Flesch Reading Ease and Flesch-Kincaid Grade Level scores are computed, what they're good for, and the limits worth knowing before you optimize for them.
How to Calculate a Sale Discount: Formulas, Examples, and Common Traps
The math behind percent off, stacked discounts, sales tax order, and the tricks retailers use to make a discount look bigger than it is.
The 90-Minute Sleep Cycle Rule: What It Actually Means
How sleep cycles really work, why the 90-minute rule is a useful approximation, and how to time bedtime so you wake up between cycles instead of mid-cycle.
How US Federal Tax Brackets Work (2024 Guide)
Marginal vs effective tax rates, how the brackets stack, what your 'tax bracket' actually means, and the worked example most people get wrong.
The Developer's JSON Guide: Everything Worth Knowing About JSON in 2026
A comprehensive guide to JSON — the spec, the variants, the tooling, debugging, JWT and Base64 context, and how to ship systems that don't break on malformed payloads.
The Online Privacy Guide: Practical Threat Models for Browser-Based Work in 2026
A comprehensive guide to online privacy in 2026 — threat models, browser-based vs. cloud tools, passwords, encryption, and the habits that matter most.
How QR Codes Actually Work: A Practical Guide
What the squares mean, how error correction works, when to use which encoding mode, and why your printed QR code sometimes doesn't scan.
Unix Timestamps and Timezones: The Confusion That Eats Your Week
A practical walkthrough of Unix time, timezones, daylight saving time, and the handful of patterns that keep teams from shipping date bugs to production.
Compound Interest, Explained Like You Actually Have to Use It
The math behind compound interest, why the Rule of 72 works, and why time matters more than rate for most real financial decisions.
Password Strength in 2026: What Length and Character Sets Actually Buy You
A practical look at entropy, NIST's current guidance, real GPU cracking speeds in 2026, and why passphrases beat forced complexity every time.
Never Paste This Into a Random Online Tool
A practical threat model for developers and knowledge workers who use web tools at work. What's actually safe, what isn't, and what to do instead.
Base64 Explained: What It Is, Why It Exists, and When Not to Use It
A practical walkthrough of Base64 encoding — what it actually does to your bytes, why it's not encryption, and the handful of real places it still earns its keep in 2026.
JWT Authentication Mistakes That Keep Appearing in Production
A tour of the JWT pitfalls that still ship to production in 2026 — algorithm confusion, weak secrets, missing expiry, and the subtle ways a library can fail open.
Why Your PDF Tool Should Run in the Browser, Not the Cloud
What actually leaks when you upload a PDF to a random online tool, what modern in-browser PDF libraries can genuinely do, and a checklist for before you upload anything sensitive.
Debugging Malformed JSON: A Field Guide
Every JSON parse error has a real cause hiding behind an unhelpful message. A practical guide to the five failure modes that produce 90% of the pain.
Client-Side Image Compression: What's Actually Happening in the Browser
How browsers compress images without touching a server — the real pipeline behind Canvas, OffscreenCanvas, and WebCodecs, and when it's not enough.
JSON vs. JSON5 vs. JSONC: Which One and When
Three formats that look nearly identical, behave completely differently, and produce a steady stream of parser errors when confused. A practical guide to telling them apart.
5 Common Percentage Mistakes and How to Avoid Them
Percentage points vs percent, symmetric vs asymmetric changes, markup vs margin - the five places percentage math quietly lies, and how to get them right.
Social Media Character Limits 2026: X, Bluesky, LinkedIn & More
Current character limits for X, Bluesky, LinkedIn, Instagram, Threads, Mastodon and TikTok in 2026 - and how each counts emoji, URLs and multibyte text.
Word Count Rules: Hyphens, Contractions, Emoji & Punctuation
Do hyphenated words, contractions, and emoji count as one word? How Microsoft Word, Google Docs, and style guides count punctuation, dashes, and Unicode.
Tools maintained by Aygul Dovletova
AES-256 Encrypt / Decrypt Online - Free, In-Browser
Encrypt and decrypt text with AES-128, AES-192, or AES-256 in GCM, CBC, or CTR mode. PBKDF2 key derivation, entirely in your browser.
Fun & UtilityAesthetic Text Generator
Transform text into vaporwave, upside down, small caps, bold, italic, strikethrough, bubble, and square Unicode styles.
Math & CalculatorsAge Calculator
Calculate exact age in years, months and days from a birthdate.
ConvertersAngle Converter
Convert between degrees, radians, gradians, turns, arcminutes and arcseconds.
Math & CalculatorsArea & Volume Calculator
Calculate area of 2D shapes and volume of 3D solids.
Fun & UtilityASCII Art Generator
Convert text to large block-letter ASCII art. Supports A-Z, 0-9, and basic punctuation.
CSS & DesignAspect Ratio Calculator
Calculate and visualize aspect ratios for any dimensions.
Video & AudioAudio Converter
Convert audio between MP3, WAV, M4A, OGG and FLAC. Pick bitrate for lossy formats. Files auto-deleted after 15 minutes.
Video & AudioAudio Trimmer
Cut a section from MP3, WAV, M4A, OGG or FLAC files. Stream-copy is fast and lossless. Files auto-deleted after 15 minutes.
Video & AudioAudio Waveform Generator
Generate a SoundCloud-style waveform image from any audio file. Decoded in your browser, exported as PNG or SVG.
Home & LifestyleBaby Name Generator
Generate random baby names with filters for gender, cultural origin and starting letter.
QR & BarcodeBarcode Generator
Generate barcodes in CODE128, EAN-13, UPC, CODE39 and more formats.
QR & BarcodeBarcode Reader
Free online barcode reader — upload an image to scan and decode barcodes. Supports EAN, UPC, Code 128, QR and more.
Developer ToolsBase64 Encoder & Decoder
Encode UTF-8 text to Base64 online or decode Base64 back to UTF-8 and plain text. Runs in your browser with no upload.
Image ToolsBase64 to Image Converter
Decode a Base64 string or data URL back into a viewable image and download it as PNG, JPG, WebP or GIF. Runs in your browser.
Security & PrivacyBasic Auth Header Generator
Create HTTP Basic Authentication headers from a username and password or API token.
Text ToolsBinary to Text
Convert text to binary and binary back to text.
CSS & DesignBlob Shape Generator
Generate organic blob shapes as SVG.
Math & CalculatorsBMI Calculator
Calculate your Body Mass Index and find your weight category.
CSS & DesignBorder Radius Generator
Create CSS border-radius with a visual corner editor.
CSS & DesignCSS Box Shadow Generator
Create CSS box shadows with a visual editor. CSS box-shadow generator, shadow maker and box-shadow builder with live preview, multi-layer support and Material elevation presets.
Finance ToolsBudget Planner (50/30/20)
Plan your monthly budget using the 50/30/20 rule. Editable percentages with weekly, monthly and annual breakdowns.
QR & BarcodeBulk QR Code Generator
Generate multiple QR codes at once from a list of URLs or text.
Developer ToolsBulk URL Encode / Decode
Encode or decode many URLs at once. Paste a newline-separated list and the tool processes each line in parallel, preserving order and blank lines.
Date & TimeBusiness Days Calculator
Count business days between two dates excluding weekends and custom holidays.
Math & CalculatorsByte / Bit Converter
Convert between bits, bytes, KB, MB, GB, TB and PB.
Home & LifestyleCalorie Calculator
Calculate BMR and TDEE using the Mifflin-St Jeor equation with weight loss and gain targets.
Text ToolsCase Converter
Convert text between UPPER, lower, Title, Sentence, camelCase, snake_case and more.
Text ToolsCharacter Counter
Count characters with platform-specific limits for Twitter, Instagram and more.
Developer ToolsCode Screenshot
Create beautiful code snippet images with customizable themes.
Fun & UtilityCoin Flipper
Flip a virtual coin with animation. Track heads/tails counts, percentages, and streaks.
Fun & UtilityColor Blindness Simulator
Simulate how colors appear with protanopia, deuteranopia, tritanopia, and achromatopsia using color transformation matrices.
Developer ToolsColor Converter
Convert colors between HEX, RGB, HSL and CMYK formats.
CSS & DesignColor Palette Generator
Generate harmonious color palettes, Tailwind-style 50-900 scales and design-system tokens from any base hex color. Also a hex color palette generator (Farbpalette Generator auf Deutsch).
CSS & DesignColor Picker
Pick colors visually and get HEX, RGB, and HSL values.
Finance ToolsCompound Interest Calculator
Calculate compound interest with customizable principal, rate, time, frequency and optional monthly contributions.
ConvertersCooking Measurement Converter
Convert between cups, tablespoons, teaspoons, milliliters, fluid ounces and liters.
Date & TimeCountdown Timer
Set a target date and time, then watch a live countdown showing days, hours, minutes and seconds.
ProductivityCover Letter Generator
Generate professional cover letters from a fill-in template with your details and experience.
Developer ToolsCron Expression Parser
Parse cron expressions into human-readable schedules with next run times.
Security & PrivacyCSP Header Generator
Build Content-Security-Policy headers with a visual form, presets and per-directive configuration.
CSS & DesignCSS Animation Generator
Create CSS keyframe animations with presets and visual preview. Doubles as an animate-CSS generator and keyframe maker.
CSS & DesignCSS Clip Path Generator
Create CSS clip-path shapes with visual editing and presets. Clip-path maker and CSS shape generator in one tool.
CSS & DesignCSS Filter Generator
Create CSS filter effects with blur, brightness, contrast, grayscale and more. Image-filter CSS in one click.
Developer ToolsCSS Formatter / Minifier
Format, beautify and minify CSS code.
CSS & DesignCSS Grid Generator
Build CSS Grid layouts visually with live preview. Works as a grid system generator and HTML grid generator.
CSS & DesignCSS Pattern Generator
Create repeating CSS background patterns with visual presets.
CSS & DesignCSS Scrollbar Styler
Create custom CSS scrollbar styles with visual controls.
CSS & DesignCSS Triangle Generator
Create CSS triangle and arrow shapes using the pure-CSS border technique. Triangle generator and path CSS generator in one.
Developer ToolsCSV to JSON Converter
Convert CSV data to JSON array format.
ConvertersData Storage Converter
Convert between bits, bytes, KB, MB, GB, TB and PB with binary (1024) and decimal (1000) modes.
Date & TimeDate Difference Calculator
Calculate the exact difference between two dates in years, months, days, weeks, hours and minutes.
Date & TimeDate Formatter
Format any date in 12 patterns including ISO 8601, US, EU, RFC 2822, Unix timestamp and relative.
Fun & UtilityDecision Wheel
Add custom options and spin a colorful wheel to make random decisions. Animated CSS wheel with smooth deceleration.
Fun & UtilityDice Roller
Roll D4, D6, D8, D10, D12, or D20 dice. Choose quantity, see individual results and totals with roll history.
Developer ToolsDiff Checker
Compare code or text with line-by-line diff and unified output.
ProductivityDigital Whiteboard
Draw and sketch on an HTML5 canvas with pen, eraser, colors, and PNG download.
Math & CalculatorsDiscount Calculator
Calculate discount amount, sale price, savings, and discounted value with optional sales tax. Supports stacked coupons.
ConvertersElectricity Cost Calculator
Calculate daily, monthly and yearly electricity cost from watts, hours per day and electricity rate.
ProductivityEmail Signature Generator
Generate professional HTML email signatures with contact details and social links.
Text ToolsEmoji Picker & Search
Search and copy emojis by name or category.
ConvertersEnergy Converter
Convert between joules, calories, kilocalories, BTU, kilowatt-hours and electronvolts.
Video & AudioExtract Audio from Video
Pull the audio track out of MP4, WebM, MOV and MKV. Output as MP3, WAV, AAC or Opus. Files auto-deleted after 15 minutes.
Text ToolsFancy Text Generator
Generate stylish text with bubbles, squares, upside down and more for social media.
Image ToolsFavicon Generator
Generate favicons in all standard sizes (16x16 to 512x512) for websites and PWAs.
Math & CalculatorsFibonacci Sequence Generator
Generate Fibonacci numbers up to any length.
Text ToolsFind & Replace
Find and replace text with regex support and case-sensitive options.
ProductivityFlashcard Maker
Create and study flashcards with front/back content, shuffle, and navigation.
CSS & DesignFlexbox Playground
Build CSS flexbox layouts visually with live preview and copy-ready CSS output.
CSS & DesignFont Pair Suggester
Discover beautiful Google Font pairings for your projects.
Fun & UtilityFortune Cookie
Open a virtual fortune cookie to reveal a random fortune with lucky numbers. 50+ unique fortunes.
Math & CalculatorsFraction Calculator
Add, subtract, multiply and divide fractions with simplified results.
Finance ToolsFreelance Hourly Rate Calculator
Compute the hourly rate a freelancer must charge to hit a target take-home after taxes, business expenses, profit margin and realistic billable utilisation.
ConvertersFuel Economy Converter
Convert between MPG (US), MPG (UK), L/100km and km/L with inverse relationship handling.
Math & CalculatorsGCD / LCM Calculator
Find the greatest common divisor and least common multiple of two numbers.
CSS & DesignGlassmorphism Generator
Create frosted glass CSS effects with backdrop blur. Glassmorphism generator and glass effect CSS builder in one.
SEO & Web ToolsGoogle SERP Preview
Preview how your page appears in Google search results with character count indicators.
CSS & DesignGradient Generator
Create CSS linear and radial gradients with a visual editor.
ProductivityGrammar Checker
Check text for double spaces, repeated words, misspellings, capitalization, and passive voice.
Developer ToolsHash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text.
SEO & Web ToolsHeading Structure Analyzer
Extract and visualize H1-H6 heading hierarchy with SEO issue detection.
Developer ToolsHMAC Generator
Generate HMAC signatures with SHA-1, SHA-256, SHA-384 and SHA-512.
SEO & Web ToolsHreflang Tag Generator
Generate hreflang link tags for multilingual websites with x-default support.
Developer ToolsHTML Entity Encode / Decode
Encode special characters to HTML entities or decode them back.
Developer ToolsHTML Formatter / Beautifier
Format, beautify and minify HTML code.
Developer ToolsHTML to JSX Converter
Convert HTML to JSX with automatic attribute conversion.
Text ToolsHTML to Markdown
Convert HTML to clean Markdown text.
Developer ToolsHTTP Status Code Reference
Searchable reference for all HTTP status codes with descriptions.
Image ToolsImage Blur & Pixelate
Apply blur or pixelation effects to images with adjustable intensity.
Image ToolsImage Color Picker
Upload an image and pick colors in HEX, RGB, and HSL with a visual color history.
Image ToolsImage Compressor
Compress images by adjusting quality to reduce file size without losing visual clarity.
Image ToolsImage Cropper
Crop images with preset aspect ratios like 1:1, 16:9, and 4:3 using a visual editor.
Image ToolsImage Flip & Rotate
Flip images horizontally or vertically and rotate by 90, 180, or 270 degrees.
Image ToolsImage Format Converter
Convert images between PNG, JPEG, and WebP formats in one click.
Image ToolsImage Metadata Viewer
View file info, dimensions, aspect ratio, and basic EXIF data from any image.
Image ToolsImage Resizer
Resize images by pixels or percentage with aspect ratio lock.
Image ToolsImage Resizer (Server-Side)
Resize JPEG, PNG, WebP, AVIF, and HEIC on our EU servers with proper fit modes. Files auto-deleted after 15 minutes.
Image ToolsImage to ASCII Art
Convert images to ASCII art using text characters with adjustable width and brightness.
Image ToolsAVIF Converter
Convert JPEG, PNG, WebP, or HEIC to AVIF with a quality slider. Files auto-deleted after 15 minutes.
Image ToolsImage to Base64 Converter
Convert an image to a Base64 data URL or raw Base64 string for HTML, CSS, and API payloads. Runs in your browser.
PDF ToolsImage to PDF
Combine multiple JPG and PNG images into a single PDF document.
Image ToolsImage Vectorizer
Convert PNG, JPG, WebP, GIF or BMP images to scalable SVG vector format directly in your browser.
Image ToolsImage Watermark
Add customizable text watermarks with controls for size, color, opacity, and position.
Finance ToolsInflation Calculator
Calculate the impact of inflation on purchasing power over any time period.
Finance ToolsROI Calculator (Return on Investment)
Calculate ROI, CAGR, annual return and percentage gain from initial investment, final value and holding period. Works for stock ROI, after-tax ROI, social ROI and required-return scenarios.
Text ToolsInvisible Character Detector
Find and remove hidden zero-width and invisible characters from text.
ProductivityInvoice Generator
Create professional invoices with line items, tax calculation, and printable output.
Developer ToolsJavaScript Formatter / Minifier
Format, beautify and minify JavaScript code with Prettier-style defaults.
Developer ToolsJSON Diff Viewer
Compare two JSON documents semantically. Detects added, removed and changed keys and array elements; ignores object key order.
Developer ToolsJSON Formatter
Format, validate and minify JSON with syntax highlighting.
Developer ToolsJSON to CSV Converter
Convert JSON arrays to CSV format with custom delimiters.
Developer ToolsJSON to YAML Converter
Convert JSON to YAML format instantly.
Developer ToolsJSONPath Evaluator
Run JSONPath queries against a JSON document and see the matched values. Supports child, index, slice, wildcard and recursive-descent operators.
Developer ToolsJWT Decoder
Decode and inspect JWT tokens — header, payload and claims.
Developer ToolsJWT Token Generator
Sign a JWT (HS256, HS384, HS512) from a JSON payload and shared secret. Runs entirely in your browser using the Web Crypto API.
SEO & Web ToolsKeyword Density Checker
Analyze word frequency with single words, bigrams and trigrams with density percentages.
ConvertersLength Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.
Text ToolsLine Counter
Count total lines, blank lines and get line statistics.
Math & CalculatorsLoan / Mortgage Calculator
Calculate monthly payments, total interest and amortization for any loan.
Finance ToolsLoan EMI Calculator
Calculate Equated Monthly Installments for any loan. See EMI, total interest and payment breakdown.
Text ToolsLorem Ipsum Generator
Generate placeholder text in paragraphs, sentences or words.
Fun & UtilityLove Calculator
Enter two names and calculate a fun compatibility score from 0-100% with hearts and visual display.
Developer ToolsMarkdown Preview
Write Markdown and see rendered HTML in a live split-pane preview.
ProductivityMarkdown Table Generator
Build a Markdown table interactively. Add rows and columns, set per-column alignment and copy the GitHub-flavoured output.
Text ToolsMarkdown to HTML
Convert Markdown to HTML with live preview.
ProductivityMeeting Cost Calculator
Calculate the true cost of meetings based on attendees, hourly rates, and duration with a live timer.
SEO & Web ToolsMeta Tag Generator
Generate complete HTML meta tags including Open Graph and Twitter Card tags.
Developer ToolsMIME Type Lookup
Look up MIME types by file extension or search by type.
Text ToolsMorse Code Translator
Translate text to Morse code and Morse code to text.
Finance ToolsMortgage Calculator
Estimate monthly mortgage payments, total interest and total cost. Includes full amortization schedule.
Home & LifestyleMoving Box Calculator
Estimate moving boxes needed by room type with breakdown by small, medium and large sizes.
Video & AudioMute Video
Remove the audio track from MP4, WebM, MOV and MKV. Stream-copy keeps the video quality intact. Files auto-deleted after 15 minutes.
Finance ToolsNet Worth Calculator
Calculate your net worth by adding assets and liabilities. Dynamic rows with debt-to-asset ratio.
CSS & DesignNeumorphism Generator
Create soft UI neumorphic shadows and effects.
ProductivityNotes Scratchpad
Simple persistent notepad with auto-save, word count, and local storage.
Math & CalculatorsNumber Base Converter
Convert numbers between binary, octal, decimal and hexadecimal.
SEO & Web ToolsOpen Graph Preview
Preview how your page looks when shared on Facebook and LinkedIn.
Home & LifestylePaint Calculator
Calculate how many gallons of paint you need for a room based on dimensions, doors and windows.
ProductivityParaphrasing Tool
Rewrite text using synonym replacement for basic paraphrasing. No AI required.
Security & PrivacyPassword Entropy Calculator
Estimate password entropy, character pool size and crack-time ranges for online and offline attacks.
Security & PrivacyPassword Generator
Generate cryptographically secure random passwords with configurable length, character types and entropy display.
Security & PrivacyPassword Strength Checker
Check password strength with entropy calculation, pattern detection and common password matching.
Finance ToolsPaycheck Calculator
Estimate take-home pay after federal tax, Social Security and Medicare deductions.
Security & PrivacyPBKDF2 Hash Generator
Derive cryptographic keys from passwords using PBKDF2 with configurable iterations, salt and hash function.
PDF ToolsPDF Compressor
Compress PDFs with Ghostscript image downsampling. Pick a quality preset. Files auto-deleted after 15 minutes.
PDF ToolsPDF Merge (Server-Side)
Merge up to 20 PDFs into a single document on our EU servers using qpdf. Files auto-deleted after 15 minutes. Handles large or password-cleared inputs the in-browser merger cannot.
PDF ToolsPDF Merger
Merge multiple PDF files into a single document with drag-and-drop reordering.
PDF ToolsPDF Page Reorder
Rearrange pages in a PDF document with a visual drag-and-drop interface.
PDF ToolsPDF Password Protect
Add AES-256 password protection to PDF files via qpdf. Files auto-deleted after 15 minutes.
PDF ToolsPDF Rotate (Server-Side)
Rotate every page of a PDF, or just a selected range, by 90, 180, or 270 degrees on our EU servers. qpdf-based, metadata preserved. Auto-deleted after 15 minutes.
PDF ToolsPDF Rotate Pages
Rotate individual or all pages in a PDF by 90, 180, or 270 degrees.
PDF ToolsPDF Split (Server-Side)
Split a PDF into multiple files by page ranges on our EU servers. Returns a zip containing one PDF per range. Auto-deleted after 15 minutes. Handles documents the in-browser splitter cannot.
PDF ToolsPDF Splitter
Extract specific pages or page ranges from a PDF into a new document.
PDF ToolsPDF to Image
Convert PDF pages to PNG or JPG images with adjustable quality and scale.
PDF ToolsPDF to Text
Extract text content from PDF documents with word and character counts.
PDF ToolsPDF Unlock
Remove password protection from a PDF you have the password to. qpdf-based. Files auto-deleted after 15 minutes.
Math & CalculatorsPercentage Calculator
Calculate percentages: X% of Y, percentage increase/decrease, and more.
Home & LifestylePet Age Calculator
Convert dog or cat age to human years with breed size adjustment for dogs.
Image ToolsPlaceholder Image Generator
Generate custom placeholder images with configurable size, colors, and text.
Date & TimePomodoro Timer
25-minute work and 5-minute break cycles with progress bar, session counter and phase tracking.
ConvertersPressure Converter
Convert between pascals, kilopascals, bar, atmospheres, PSI, mmHg and torr.
Math & CalculatorsPrime Number Checker
Check if a number is prime and find all primes up to any limit.
QR & BarcodeQR Code Generator
Generate QR codes for URLs, text, email, phone and WiFi.
QR & BarcodeQR Code Reader
Scan and decode QR codes from any image online - upload a photo, screenshot or saved picture and read the QR contents instantly in your browser.
Fun & UtilityRandom Color Generator
Generate random colors with HEX, RGB and HSL values. Random color picker, colour randomizer and 5-color palette builder with history.
Fun & UtilityRandom Name Generator
Generate random first and last names with options for gender, real, fantasy, or business name types.
Math & CalculatorsRandom Number Generator
Generate random numbers within a range with options for uniqueness and sorting.
Fun & UtilityRandom Quote Generator
Generate random inspirational, funny, motivational, and wisdom quotes from a curated collection of 50+ quotes.
Text ToolsRandom String Generator
Generate random strings with configurable length and character set.
SEO & Web ToolsReadability Checker
Free reading level checker and writing grade level analyzer. Flesch-Kincaid, Flesch Reading Ease, Gunning Fog and Coleman-Liau scores in one place.
Home & LifestyleRecipe Scaler
Scale recipe ingredients up or down proportionally for any number of servings.
Developer ToolsRegex Tester
Test regular expressions with live highlighting, matches and capture groups.
Text ToolsRemove Duplicate Lines
Remove duplicate lines from text with case-sensitive and sorting options.
ProductivityResume Builder
Build a professional resume with sections for experience, education, and skills. Print or download as HTML.
Finance ToolsRetirement Calculator
Project your retirement fund based on current savings, monthly contributions and expected returns.
SEO & Web ToolsRobots.txt Generator
Generate robots.txt files with user-agent rules, allow/disallow paths and sitemap.
Math & CalculatorsRoman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers.
Text ToolsROT13 Encoder / Decoder
Encode and decode text with ROT13 and other rotation ciphers.
Security & PrivacyRSA Key Generator
Generate RSA key pairs (2048 or 4096 bit) in PEM format using the Web Crypto API.
Math & CalculatorsSalary / Hourly Rate Calculator
Convert between annual salary, monthly, weekly, daily and hourly pay rates.
Finance ToolsSalary to Hourly Converter
Convert an annual salary to an hourly wage and back. Hourly, weekly, bi-weekly, monthly and annual figures side by side.
SEO & Web ToolsSchema Markup Generator (JSON-LD)
Generate JSON-LD structured data for Article, FAQ, Product, Organization, LocalBusiness, HowTo, Recipe and Event.
SEO & Web ToolsArticle Schema Generator (JSON-LD)
Generate Article JSON-LD schema for blog posts, news pages and long-form guides.
SEO & Web ToolsFAQ Schema Generator (JSON-LD)
Generate FAQPage JSON-LD schema for FAQ sections with Question and Answer nodes.
SEO & Web ToolsOrganization Schema Generator (JSON-LD)
Generate Organization JSON-LD schema with logo, contactPoint and sameAs for knowledge panel signals.
SEO & Web ToolsProduct Schema Generator (JSON-LD)
Generate Product JSON-LD schema with Offer, price, currency and AggregateRating for merchant listings.
Math & CalculatorsScientific Calculator
Full-featured scientific calculator with trigonometry, logarithms and more.
Security & PrivacySecure Token Generator
Generate cryptographically secure random tokens in base64url, hex, alphanumeric or UUID v4 format.
Security & PrivacySecurity Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text or files using the Web Crypto API.
SEO & Web ToolsSEO Slug Generator
Generate SEO-friendly URL slugs with stop word removal and length control.
SEO & Web ToolsSEO Word Counter
Count words, characters, headings, paragraphs with keyword density and reading level.
ConvertersShoe Size Converter
Convert shoe sizes between US, UK, EU and JP sizing systems for men and women.
Home & LifestyleSleep Cycle Calculator
Find when to sleep or wake up based on 90-minute REM cycles. Free bedtime and wake time calculator.
ProductivitySocial Media Character Counter
Check character counts against limits for Twitter, Instagram, LinkedIn, Facebook, YouTube, and TikTok.
ConvertersSpeed Converter
Convert between km/h, mph, m/s, ft/s and knots.
Developer ToolsSQL Formatter
Format and beautify SQL queries with keyword uppercasing.
Math & CalculatorsStatistics Calculator
Calculate mean, median, mode, standard deviation, variance and more.
Date & TimeStopwatch
Precise online stopwatch with start, stop, reset and lap time recording. Centisecond accuracy.
Text ToolsString Length Calculator
Calculate string length in characters, bytes (UTF-8/UTF-16) and graphemes.
Image ToolsEXIF Stripper
Remove EXIF, GPS, camera, software, and XMP metadata from JPEG, PNG, WebP, HEIC. Files auto-deleted after 15 minutes.
SEO & Web ToolsStructured Data Validator
Validate JSON-LD structured data for correct context, type and required fields.
Image ToolsSVG to PNG Converter
Convert SVG vector graphics to PNG raster images at any custom size.
CSS & DesignSVG Wave Generator
Create decorative SVG wave dividers for websites.
Developer ToolsTailwind CSS Playground
Write HTML with Tailwind CSS classes and see live results. Use it as an online Tailwind editor and Tailwind play environment.
Finance ToolsTax Bracket Calculator
Calculate federal income tax using 2024 and 2025 US tax brackets, with 2023 reference. See effective rate, marginal rate and tax per bracket.
ConvertersTemperature Converter
Convert between Celsius, Fahrenheit and Kelvin with formula display.
Text ToolsText Diff / Compare
Compare two texts side by side and highlight the differences.
Text ToolsText Repeater
Repeat text multiple times with custom separators.
Text ToolsText Reverser
Reverse text by characters, words or lines.
CSS & DesignText Shadow Generator
Create CSS text shadows with a visual editor and presets. Doubles as a CSS font shadow generator.
Text ToolsText Sorter
Sort lines alphabetically, numerically, by length or randomly.
Text ToolsText to Handwriting
Render text as handwritten notes with customizable fonts and paper styles.
Text ToolsText to Slug
Generate URL-friendly slugs from any text.
Home & LifestyleTile Calculator
Calculate tiles needed for floors or walls with grout spacing and waste percentage.
ConvertersTime Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months and years.
Date & TimeTimezone Converter
Convert times between timezones instantly. Supports 28+ world timezones with DST handling.
Math & CalculatorsTip Calculator
Calculate the tip and split the bill between any number of people. Works as a tip splitter and bill splitter in one.
Developer ToolsTOML to JSON Converter
Convert TOML configuration to JSON format.
Security & PrivacyTOTP Generator
Generate time-based one-time passwords (TOTP) from a base32 secret with live 30-second countdown.
SEO & Web ToolsTwitter Card Preview
Preview how your page looks when shared on Twitter/X with meta tag generation.
ProductivityTyping Speed Test
Test your typing speed with real-time WPM, accuracy, and character tracking.
Text ToolsUnicode Text Converter
Convert text to bold, italic, script, fraktur and other Unicode styles.
Math & CalculatorsUnit Converter
Convert length, weight, temperature, speed, volume and area units.
ConvertersAll-in-One Unit Converter
Master converter with tabs for length, weight, temperature, speed, area and volume.
Developer ToolsUnix Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Developer ToolsURL Encoder / Decoder
Online URL encoder and decoder for query strings, paths, and HTTP request values - percent-encodes characters with encodeURIComponent.
Developer ToolsURL Parser
Break a URL into protocol, host, port, path, query parameters and hash with a structural view of every component.
Developer ToolsUser Agent Parser
Parse user agent strings to identify browser, OS and device.
Developer ToolsUUID Generator
Generate UUID v4 identifiers, single or in bulk.
Developer ToolsUUID Version Detector
Identify the version (v1, v3, v4, v5, v6, v7, v8) and variant of any UUID and extract embedded timestamps.
Video & AudioVideo Compressor
Compress MP4, WebM and MOV videos with H.264 to make them smaller for sharing. Files auto-deleted after 15 minutes.
Video & AudioVideo Concatenator
Join 2 to 10 video clips into a single MP4. Reorder before submit, server-side FFmpeg picks concat-demuxer for matching codecs and re-encode for mixed inputs. Files auto-deleted after 15 minutes.
Video & AudioVideo Converter
Convert videos between MP4, WebM, MKV, MOV, and extract MP3 audio.
Video & AudioVideo Cropper
Crop MP4, WebM, MOV and MKV videos to a rectangle or aspect preset (16:9, 9:16, 1:1, 4:3). Server-side FFmpeg, no signup. Files auto-deleted after 15 minutes.
Video & AudioVideo Reverser
Reverse an MP4, WebM, MOV or MKV video and its audio with one click. Server-side FFmpeg handles the full re-encode. Files auto-deleted after 15 minutes.
Video & AudioVideo Speed Changer
Speed up or slow down MP4, WebM, MOV and MKV videos from 0.25x to 4x. Audio is re-pitched with FFmpeg's atempo chain so voices stay natural. Files auto-deleted after 15 minutes.
Video & AudioVideo to GIF Converter
Convert MP4, WebM and MOV videos to animated GIFs. Files are auto-deleted after 15 minutes.
Video & AudioVideo Trimmer
Cut a section from MP4, WebM or MOV videos. Stream-copy is fast and lossless.
Video & AudioVoice Recorder
Record voice memos directly in your browser. The audio never leaves your device - no upload, no signup.
Home & LifestyleWallpaper Calculator
Calculate wallpaper rolls needed for a room with pattern repeat, square-feet workflow, and metric/imperial conversions.
Home & LifestyleWater Intake Calculator
Calculate daily water intake based on body weight, activity level and climate.
Date & TimeWeek Number Calculator
Find the ISO week number, day of year, days remaining, quarter and more for any date.
ConvertersWeight Converter
Convert between milligrams, grams, kilograms, ounces, pounds, stone and tons.
Text ToolsWhitespace Remover
Trim, collapse or remove whitespace and blank lines from text.
QR & BarcodeWiFi QR Code Generator
Generate a QR code for your WiFi network so guests can connect by scanning.
Text ToolsWord Counter
Count words, characters, sentences, paragraphs and estimate reading time.
Date & TimeWorld Clock
Live-updating clocks for multiple timezones. Add and remove cities to build your custom dashboard.
Developer ToolsXML Formatter / Validator
Format, beautify and validate XML with customizable indentation.
SEO & Web ToolsXML Sitemap Generator
Generate valid XML sitemaps from a list of URLs with changefreq and priority.
Developer ToolsYAML to JSON Converter
Convert YAML to JSON format instantly.