About One Developer Tools

One Developer Tools is a curated collection of more than 300 single-purpose web utilities for developers, students, marketers, designers and anyone who lives in the browser.

Why we built it

Useful online tools are scattered across thousands of ad-heavy, login-walled, slow-loading websites. We wanted one clean place where every tool is fast, free, private, and does one thing well.

How it works

Every tool runs entirely in your browser using standard web APIs — Canvas, Web Crypto, Intl, fetch, localStorage. Nothing you paste, upload or type leaves your device. There are no accounts, no paywalls, and no usage limits.

What you'll find

• SEO utilities: meta generators, structured-data builders, keyword analysis.
• Image tools: resize, compress, crop, convert, filter — all client-side.
• Developer utilities: formatters, validators, encoders, hash generators, regex testers.
• Tools for students: GPA calculators, citation builders, study timers.
• Converters: units, formats, encodings, time, base, currency.
• Text, math, productivity, security and color tools.

Open and free

Everything here is free to use commercially. If you have an idea for a tool we don't yet offer, get in touch.