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    Free Tools: Test, Measure, and Fix Your Site

    23 free tools to test, measure, and fix web performance: TTFB tests, compression checks, image converters, minifiers, and more.

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    All Free Tools

    22 tools

    • Drag-and-drop images and compress them losslessly or lossily right in your browser. Download smaller, faster-loading files in one click.

    • Resize JPG, PNG, or WebP images to exact dimensions. Lock aspect ratio, pick format and quality, download instantly.

    • Convert PNG and JPG to WebP for 25–35% smaller files at the same visual quality. Batch upload supported.

    • Convert PNG and JPG to AVIF for the smallest modern image format. 30–50% smaller than WebP at equivalent quality.

    • Generate favicons in every size browsers and devices need (16–512px) from a single upload, plus copy-paste HTML.

    • Encode or decode Base64 strings or files instantly in your browser. Swap between encode and decode in one click.

    • Strip whitespace, comments, and redundancy from CSS to reduce file size and speed up render-blocking requests.

    • Quick browser-side JS minification, strips comments and collapses safe whitespace while preserving strings and regex.

    • Shrink HTML by removing whitespace and comments. Preserves <pre>, <script>, <style>, and <textarea> contents.

    • Pretty-print, minify, and validate JSON. Catch syntax errors instantly with browser-side parsing.

    • Check whether a URL is served with Gzip or Brotli compression, and what content-encoding header was returned.

    • Inspect Cache-Control, ETag, Expires, and CDN cache headers for any URL to diagnose caching problems.

    • Look up A, AAAA, CNAME, MX, TXT, NS, SOA, and CAA records for any domain. Powered by Google Public DNS.

    • Generate copy-paste lazy-loading HTML for images, iframes, background images, and YouTube embeds to improve LCP.

    • Strip comments, metadata, editor cruft, and excess whitespace from SVG files. Round decimals to shrink file size.

    • Inspect every HTTP response header for any URL, Cache-Control, ETag, CDN cache status, security headers, and more.

    • Trace the full redirect chain for any URL. See every 301, 302, 307, and 308 hop until the final destination.

    • Measure how long the server takes to deliver the first byte. TTFB above 800ms hurts Core Web Vitals.

    • Extract above-the-fold CSS rules to inline in <head> and eliminate render-blocking stylesheets.

    • Measure total page weight and see how much each image, script, stylesheet, and font is adding.

    • Scan a page for render-blocking CSS and JavaScript that delay First Contentful Paint and LCP, with fixes.

    • Find CSS selectors that don't match any element in your HTML and download a leaner stylesheet.

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