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ZeroUtil

Developer Tools

JSON formatters, encoders, decoders and dev utilities

Base64 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.

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Bulk 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.

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Code Screenshot

Create beautiful code snippet images with customizable themes.

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Color Converter

Convert colors between HEX, RGB, HSL and CMYK formats.

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Cron Expression Parser

Parse cron expressions into human-readable schedules with next run times.

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CSS Formatter / Minifier

Format, beautify and minify CSS code.

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CSV to JSON Converter

Convert CSV data to JSON array format.

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Diff Checker

Compare code or text with line-by-line diff and unified output.

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Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text.

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HMAC Generator

Generate HMAC signatures with SHA-1, SHA-256, SHA-384 and SHA-512.

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HTML Entity Encode / Decode

Encode special characters to HTML entities or decode them back.

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HTML Formatter / Beautifier

Format, beautify and minify HTML code.

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HTML to JSX Converter

Convert HTML to JSX with automatic attribute conversion.

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HTTP Status Code Reference

Searchable reference for all HTTP status codes with descriptions.

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JavaScript Formatter / Minifier

Format, beautify and minify JavaScript code with Prettier-style defaults.

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JSON Diff Viewer

Compare two JSON documents semantically. Detects added, removed and changed keys and array elements; ignores object key order.

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JSON Formatter

Format, validate and minify JSON with syntax highlighting.

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JSON to CSV Converter

Convert JSON arrays to CSV format with custom delimiters.

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JSON to YAML Converter

Convert JSON to YAML format instantly.

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JSONPath Evaluator

Run JSONPath queries against a JSON document and see the matched values. Supports child, index, slice, wildcard and recursive-descent operators.

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JWT Decoder

Decode and inspect JWT tokens — header, payload and claims.

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JWT 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.

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Markdown Preview

Write Markdown and see rendered HTML in a live split-pane preview.

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MIME Type Lookup

Look up MIME types by file extension or search by type.

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Regex Tester

Test regular expressions with live highlighting, matches and capture groups.

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SQL Formatter

Format and beautify SQL queries with keyword uppercasing.

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Tailwind CSS Playground

Write HTML with Tailwind CSS classes and see live results. Use it as an online Tailwind editor and Tailwind play environment.

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TOML to JSON Converter

Convert TOML configuration to JSON format.

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Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

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URL Encoder / Decoder

Online URL encoder and decoder for query strings, paths, and HTTP request values - percent-encodes characters with encodeURIComponent.

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URL Parser

Break a URL into protocol, host, port, path, query parameters and hash with a structural view of every component.

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User Agent Parser

Parse user agent strings to identify browser, OS and device.

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UUID Generator

Generate UUID v4 identifiers, single or in bulk.

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UUID Version Detector

Identify the version (v1, v3, v4, v5, v6, v7, v8) and variant of any UUID and extract embedded timestamps.

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XML Formatter / Validator

Format, beautify and validate XML with customizable indentation.

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YAML to JSON Converter

Convert YAML to JSON format instantly.

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