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JSON, Base64, regex, UUID and more

Word counter, case converter, lorem ipsum

Color picker, palette, contrast checker

Units, number bases, time zones, JSON/CSV

Resize, compress, convert, favicon gen

Meta tags, OG preview, slug generator

Percentage, date diff, ROI, age

Character counters, image size guides

Password generator, hash checker, IP info

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Most-used tools by our community

Word & Character Counter

Count words, characters, sentences and paragraphs instantly.

Format, validate and beautify your JSON in one click.

Developer Use tool

Base64 Encode / Decode

Encode or decode Base64 strings instantly in your browser.

Converter Use tool

URL Encode / Decode

Encode or decode URL components quickly and safely.

Converter Use tool

Color Picker & Converter

Pick colors and convert between HEX, RGB, HSL and more.

useTool is a collection of fast, free browser-based tools built for developers, designers, writers, and anyone who works with data. Every tool runs entirely in your browser — your input is never sent to a server, stored, or logged. Whether you're formatting JSON from an API response, encoding a string in Base64, counting the words in a draft, or converting a hex color to RGB, useTool gives you a clean, distraction-free interface that works instantly. No account required, no rate limits, no paywalls. Just open a tool, paste your data, and you're done.