Free online web utilities

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.

Turns an ordinary website link into the matching university Web VPN address so campus-only resources can be opened.

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

Shows any text you type in large letters across the full screen, for signage or display use.

Generates a linearly scaling font-size using CSS clamp().

Collection of web-based utilities for everyday tasks, including converters and data manipulation, which can also be self-hosted.

Serves random or specific photos at any size through a URL.

A toolbox of 152 free browser-based tools, available in 17 languages with no signup.

Dynamic dummy image generator controlled by URL parameters.

Playground page for a QR code generator and reader with several rendering options.

Calculates optimized subnet masks for a list of host-count requirements.

Turns pasted JavaScript into a draggable bookmarklet link.

Turns a pasted userscript into an install link and previews its metadata.

Demo page for a JavaScript barcode writer supporting many barcode types.

Measures distance to servers, jitter, lag spikes, packet loss and bandwidth to judge if Xbox Cloud Gaming will run well.

Measures download, upload, latency and jitter using Cloudflare's test infrastructure.

Interactive demo of a JavaScript library that renders common 1D barcodes.

Escapes special characters in text as HTML entities.

Decodes percent-encoded URL strings back to readable text.

Percent-encodes text for safe use in a URL.

Converts SVG markup into a React JSX component.

Helps evaluators produce a WCAG-EM conformance report.

Decodes QR codes and barcodes from an uploaded image or URL.