About U5F

U5F is a collection of free, browser-based developer tools — things like formatters, encoders, converters, and generators that developers reach for dozens of times a week. Every tool runs entirely on your device: nothing you paste or upload is sent to a server.

Our mission

Small utilities shouldn't require an account, a subscription, or a round-trip to a server. U5F exists to make everyday developer tasks — formatting JSON, hashing a string, converting a timestamp — fast, free, and private by default.

How it works

Each tool is a self-contained page built on the same reusable template, so the experience stays consistent as the catalog grows. Processing happens client-side using standard browser APIs (the Web Crypto API for hashing, Canvas for image work, and so on) rather than a backend service.

Who it's for

U5F is built for developers, but anyone doing everyday technical tasks — students, writers working with data, or anyone who needs a quick conversion — is welcome to use it.