Tools
Check a page’s heading structure (H1-H6) in document order, and catch common issues like a missing or duplicate H1.
Convert an iPhone HEIC photo to JPG, directly in your browser.
Generate an HMAC of a message with a secret key, using SHA-1, SHA-256, SHA-384 or SHA-512 — computed locally in your browser.
View public holidays for a country in a month calendar layout.
Format, beautify and minify HTML online directly in your browser. Fast, private and free — your markup never leaves your device.
Turn CSV-shaped text (or generated dummy data) into a clean HTML table — with header, border, class, and caption options.
Free online HTML, CSS and JavaScript playground with instant live preview — runs entirely in your browser, nothing is uploaded to our server.
Check the HTTP response headers any URL sends back — server, caching, security headers, and more.
Reduce a JPG, PNG or WebP image’s file size by re-encoding it at an adjustable quality, directly in your browser.
Crop a JPG, PNG or WebP image by dragging a selection area, directly in your browser.
