Free developer tools

Format, Validate, Convert!

A growing suite of fast, private developer tools. Everything runs client-side, so your data never leaves your device, and when you are done, publish the result to a live HTTPS link in one click.

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JSON tools

JSON Beautifier Free online JSON beautifier and pretty printer. Paste messy JSON and get clean, indented, readable output instantly, all in your browser, nothing uploaded. JSON Minifier Free online JSON minifier. Strip whitespace and line breaks to shrink JSON for faster APIs and smaller payloads. Runs in your browser, never uploaded. JSON Validator Free online JSON validator and syntax checker. Find the exact line and reason your JSON is invalid, then fix it fast, all in your browser, never uploaded. JSON to XML Converter Free online JSON to XML converter. Turn any JSON object or array into clean, well-formed XML instantly, processed in your browser and never uploaded. XML to JSON Converter Free online XML to JSON converter. Parse any XML document into clean, structured JSON in one click, done entirely in your browser and never uploaded. JSON to CSV Converter Free online JSON to CSV converter. Flatten a JSON array into a clean, spreadsheet-ready CSV for Excel or Google Sheets, in your browser, never uploaded.

HTML tools

HTML Formatter Free online HTML formatter and beautifier. Paste messy or minified HTML and get clean, properly indented markup instantly, in your browser, never uploaded. HTML Viewer Free online HTML viewer. Paste HTML and see it rendered live, with the formatted source alongside. Runs in a safe browser sandbox, nothing is uploaded. HTML Validator Free online HTML checker. Spot unclosed tags, broken nesting, and missing attributes with fast structural checks that run in your browser, never uploaded. Test HTML Free online HTML, CSS & JavaScript playground with a live preview. Write code in separate panes, see it run instantly, then publish it to a live page.

Converters

HTML to Markdown Free online HTML to Markdown converter. Paste HTML or drop a file and get clean, GitHub-flavored Markdown instantly, in your browser, nothing uploaded. Markdown to HTML Free online Markdown to HTML converter with live preview. Turn GitHub-flavored Markdown into clean, safe HTML that runs in your browser, never uploaded.

PDF tools

PDF Viewer Free online PDF viewer. Open and read any PDF in your browser, no upload, no sign-up. Pages render locally and privately, and hosting it is one click.

SEO tools

Meta Tag Generator Free meta tag generator. Fill in a title, description and image, then get the title, description, Open Graph and Twitter tags ready to paste into a page. Open Graph Checker Free Open Graph checker. Enter a URL and see the title, description, image and card tags a crawler actually reads, plus what is missing and why it matters. Favicon Generator Free favicon generator. Drop an image and get every size a browser and a phone asks for, as PNGs plus the link tags to paste, generated in your browser. Robots.txt Generator Free robots.txt generator. Choose what crawlers may fetch, add disallow rules and a sitemap line, and get a valid robots.txt you can download or publish. Sitemap Generator Free XML sitemap generator. Paste a list of URLs and get a valid sitemap.xml with optional lastmod dates, ready to download, publish or cite in robots.txt. Redirect Generator Free redirect generator. Paste your old and new paths and get the rules in _redirects, .htaccess and Nginx syntax, with the status code explained for each. Webpage to PDF How to save any webpage as a PDF using the print dialog already in your browser, what breaks in the export, and how to put the result on a shareable link.