Developer Tools
Handy helpers for web developers. Find API specs, source maps, import maps, preload links, SRI hashes, fonts and SVG files used by any public website. Great for audits, learning and debugging.
- Free to use
- No sign up
- Works in your browser
OpenAPI / Swagger Spec Downloader
Find and download the OpenAPI or Swagger spec behind any API docs page. Get it as JSON or YAML and see every endpoint in a table.
OpenAPI Bundle Downloader
Turn a multi-file OpenAPI spec into one single file. We fetch every external $ref and put its content in place. Download as JSON or YAML.
Source Map Downloader
Check which JavaScript and CSS files on a page have public source maps (.map files), and download them as a ZIP. Useful for debugging and security checks.
Import Map Downloader
Extract the JavaScript import map from any page and save it as importmap.json. See every module name, where it points and its scope.
Service Worker Finder
Find the service worker file of any website and download it. See how it is registered and whether it uses offline cache, push or Workbox.
Preload URL Exporter
Export all rel="preload" links of a page to CSV. See each file, its "as" type, crossorigin and fetchpriority, and spot common preload mistakes.
Modulepreload Link Exporter
List every rel="modulepreload" link on a page and export it. See which JavaScript modules a Vite or modern app loads early.
Prefetch & Preconnect Exporter
Export all resource hints of a page: prefetch, preconnect, dns-prefetch, prerender and speculation rules. See what the site warms up in advance.
SRI Hash Exporter & Generator
List every script and stylesheet with its Subresource Integrity (SRI) value. Find files without SRI and generate sha384 hashes and ready HTML tags.
External Script Exporter
List every external JavaScript file a page loads. See first-party vs third-party scripts, blocking scripts and the services behind each domain.
CSS URL Extractor
Extract every url() from a page's CSS: background images, fonts and @imports. See where each one is used and download the assets as a ZIP.
Font URL Extractor
Find which web fonts a website uses. See every @font-face with family, weight, style, format and file URL. Export the list to CSV.
CSS Font Pack Downloader
Download all web fonts used by a page as a ZIP, with a ready fonts.css file. Perfect for self-hosting Google Fonts for speed and privacy.
SVG Asset Downloader
Find all SVG images on a page, including inline SVG icons, and download them as clean .svg files in one ZIP. Preview each one first.
Lottie JSON Downloader
Find Lottie animations on a webpage and download the JSON or .lottie files. See size, length and frame rate of each animation.
PWA Icon Pack Downloader
Download all app icons of a website in one ZIP: PWA manifest icons, favicons, Apple touch icons and more. Check for missing icon sizes.
Web Manifest Asset Packager
Download a website's web app manifest together with all its icons, screenshots and shortcut icons in one ZIP, with paths changed to local files.
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