Free online web utilities

Local file sharing in the browser that discovers nearby devices and sends files directly.

HTML5 internet speed test that measures download, upload, ping and jitter.

Sends files and text between devices on the same network or via a room code, with no signup.

Peer-to-peer file transfer that gives you a link; the data goes straight from sender to receiver.

Demo of the UAParser.js library that detects browser, engine, OS, device and CPU from a user-agent string.

Cheat sheet of easing functions with previews and ready-to-use CSS values.

Makes a printable card with a QR code and credentials so guests can join your Wi-Fi.

Generates CSS for soft-UI neumorphic shadows on a configurable shape.

Shows your public IP address with country, city and ASN details.

HTML5 speed test for measuring download and upload speeds, also usable on a local network.

QR code generator for URLs, text, Wi-Fi and vCards with styling options and a scanner.

Free API and web page for generating memes from templates through URLs.

Drag handles to create organic blob shapes using the eight-value border-radius syntax.

Encodes SVG markup so it can be used inside a CSS background-image url().

Visual CSS clip-path maker with preset shapes and draggable points.

Builds mailto links with subject, body, cc and bcc filled in and encoded.

Peer-to-peer tool for sharing files, text and screens between devices in the browser.

Builds favicon files and HTML for every platform from one image, with per-platform previews.

Whois lookup for domains, IPv4/IPv6 addresses and AS numbers with a modern interface.

Paste service that keeps the text in the URL fragment, so no database or server storage is needed.

Generates a fluid type scale as CSS clamp() variables.

Calculates a CSS clamp formula to interpolate a value between two viewport widths.

Previews an icon inside maskable-icon safe zones and exports a PWA-ready version.

Generates favicons and app icons from an image, with open source code.