Build and sign a JWT online
Build and HMAC-SHA256-sign a JWT from a header, payload, and secret, instantly in your browser.
Frequently asked questions
HS256 (HMAC-SHA256), computed with the browser's native Web Crypto API.
No, signing happens entirely in your browser.
Popular tools
Generate a QR code for free
Create a static QR code for a URL, text, Wi-Fi, or contact card in seconds.
Compress a PDF file for free
Shrink PDF file size while keeping quality readable, right in your browser.
Format and validate JSON online
Paste JSON to pretty-print, minify, and validate it instantly in your browser.
Split a PDF into separate files for free
Extract pages or split a PDF into multiple files instantly in your browser.
Compress an image online for free
Reduce image file size while preserving visual quality, right in your browser.
Convert PDF to Word for free
Turn a PDF into an editable Word document in seconds.
Generate a strong random password
Generate a cryptographically random password with adjustable length and character sets, in your browser.
Convert PNG to JPG for free
Convert a PNG image to JPG right in your browser, with adjustable quality.
Generate a Wi-Fi QR code for free
Create a QR code that connects devices to your Wi-Fi network instantly.
Merge PDF files online for free
Combine multiple PDF files into a single document in your browser. No install, no signup.
Resize an image online for free
Resize JPG, PNG, or WebP images to exact dimensions or a percentage, right in your browser.
Generate a vCard QR code for free
Share your contact details instantly with a scannable vCard QR code.