SEO & Web Tools
Free, browser-based SEO and web tools for the work you do before a page ships: write meta tags, preview how a result looks in Google and on social, generate technical files like robots.txt and XML sitemaps, and audit copy for readability and keyword balance. Everything runs in your browser, so draft titles, descriptions and unpublished URLs are never uploaded to ZeroUtil.
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Google SERP Preview
Preview how your page appears in Google search results with character count indicators.
Try freeHeading Structure Analyzer
Extract and visualize H1-H6 heading hierarchy with SEO issue detection.
Try freeHreflang Tag Generator
Generate hreflang link tags for multilingual websites with x-default support.
Try freeKeyword Density Checker
Analyze word frequency with single words, bigrams and trigrams with density percentages.
Try freeMeta Tag Generator
Generate complete HTML meta tags including Open Graph and Twitter Card tags.
Try freeOpen Graph Preview
Preview how your page looks when shared on Facebook and LinkedIn.
Try freeReadability Checker
Free reading level checker and writing grade level analyzer. Flesch-Kincaid, Flesch Reading Ease, Gunning Fog and Coleman-Liau scores in one place.
Try freeRobots.txt Generator
Generate robots.txt files with user-agent rules, allow/disallow paths and sitemap.
Try freeSchema Markup Generator (JSON-LD)
Generate JSON-LD structured data for Article, FAQ, Product, Organization, LocalBusiness, HowTo, Recipe and Event.
Try freeArticle Schema Generator (JSON-LD)
Generate Article JSON-LD schema for blog posts, news pages and long-form guides.
Try freeFAQ Schema Generator (JSON-LD)
Generate FAQPage JSON-LD schema for FAQ sections with Question and Answer nodes.
Try freeOrganization Schema Generator (JSON-LD)
Generate Organization JSON-LD schema with logo, contactPoint and sameAs for knowledge panel signals.
Try freeProduct Schema Generator (JSON-LD)
Generate Product JSON-LD schema with Offer, price, currency and AggregateRating for merchant listings.
Try freeSEO Slug Generator
Generate SEO-friendly URL slugs with stop word removal and length control.
Try freeSEO Word Counter
Count words, characters, headings, paragraphs with keyword density and reading level.
Try freeStructured Data Validator
Validate JSON-LD structured data for correct context, type and required fields.
Try freeTwitter Card Preview
Preview how your page looks when shared on Twitter/X with meta tag generation.
Try freeXML Sitemap Generator
Generate valid XML sitemaps from a list of URLs with changefreq and priority.
Try freePlan your search snippet before you publish
How a page reads in search results is decided by the title and meta description, not by the content alone. The Google SERP preview renders your title tag and meta description exactly as Google would, including pixel-width truncation, so you can see when a title gets cut off or a description trails into an ellipsis. Pair it with the SEO word counter to keep titles and descriptions inside their pixel and character budgets while you draft.
Social platforms build their own cards from separate tags. Use the Open Graph preview to check how a link unfurls on Facebook, LinkedIn and Slack, and the Twitter card preview to confirm the summary or large-image card that X will display. Getting these right once saves you from broken thumbnails and missing titles after a page is already live.
Generate the meta tags and technical files
Once the copy is set, turn it into markup. The meta tag generator outputs a clean block of title, description, robots and canonical tags ready to paste into your <head>. For multilingual sites, the hreflang tag generator produces the reciprocal language and region annotations search engines need to serve the right version. Control crawling with the robots.txt generator and help discovery with the XML sitemap generator.
Structured data done right
Rich results come from valid structured data. Use the schema markup generator to build JSON-LD for articles, products, FAQs, breadcrumbs and organizations, then run it through the structured data validator to catch missing required properties before Google does. A clean, well-formed SEO slug keeps URLs short, lowercase and readable for both users and crawlers.
Audit the page itself
On-page signals still matter. The heading structure analyzer maps your H1 to H6 outline so you can spot skipped levels and multiple H1s that confuse both readers and parsers. The readability score grades sentence and word complexity against common readability formulas, and the keyword density checker shows how often each term appears so you can avoid both thin coverage and obvious over-optimization.
A practical pre-publish checklist
- Snippet - title and description fit the SERP pixel budget and read well out of context.
- Social - Open Graph and Twitter card tags resolve a title, description and image.
- Markup - canonical, robots and hreflang tags are present and consistent.
- Structure - one H1, a logical heading outline and a clean slug.
- Schema - JSON-LD validates with no missing required fields.
- Copy - readability is appropriate for the audience and keyword usage looks natural.
Why browser-based SEO tools
SEO drafts often involve content and URLs that are not public yet - an unannounced product page, a campaign landing page, a competitor analysis you would rather keep private. ZeroUtil SEO tools run entirely in your browser, so the titles, descriptions, schema and sitemaps you generate stay on your device. There is no account, no saved project history on our side and no upload step.
Frequently Asked Questions
How do I preview how my page will look in Google search results?
Open the Google SERP preview, paste your page title, meta description and URL, and the tool renders a live snippet that matches how Google displays it. It accounts for pixel-width truncation, so you can see exactly where a long title or description would be cut off before you publish.
What is the difference between meta tags and structured data?
Meta tags such as title, description and canonical describe the page to crawlers and control the basic SERP snippet, while structured data (JSON-LD schema) describes the entities on the page so search engines can show rich results like star ratings, FAQs and breadcrumbs. Use the meta tag generator for the former and the schema markup generator plus structured data validator for the latter.
Do I need hreflang tags for my site?
You only need hreflang if you publish the same or equivalent content for different languages or regions. The hreflang tag generator builds the reciprocal annotations that tell Google which version to serve to which audience, which prevents the wrong-language page from outranking the right one in local results.
Are these SEO tools really private?
Yes. Every preview, generated tag, sitemap and schema block is produced locally by JavaScript in your browser. Unpublished titles, draft descriptions and internal URLs are not uploaded to ZeroUtil, and there is no signup or saved project data on our side.
How can I check if my content is easy to read and well-optimized?
Run your copy through the readability score to grade sentence and word complexity, then use the keyword density checker to see how often each term appears. Together they help you keep content clear for readers while avoiding both thin keyword coverage and obvious over-optimization.