Developer tools
that just work.

Fast, free, privacy-first. Everything runs in your browser.

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Nothing leaves your machine

Formatting, decoding and generating all happen locally.

One keystroke away

Press ⌘K anywhere to jump straight to any tool.

Free, no account

Every core tool is free and always will be.

Popular tools

JSON Formatter

Format, beautify and validate JSON instantly.

JWT Decoder

Decode and inspect JSON Web Tokens.

UUID Generator

Generate v4 UUIDs in bulk.

Base64 Encoder

Encode text or files to Base64.

Regex Tester

Test regular expressions against sample text.

Unix Timestamp Converter

Convert Unix timestamps to and from dates.

Hash Generator

Generate SHA-1, SHA-256 and SHA-512 hashes.

SQL Formatter

Format and beautify SQL queries.

Text Tools

Text DiffWord CounterCase ConverterRegex Tester

Free online developer tools

iZZi DevTools collects the small utilities every developer reaches for — JSON formatting and validation, Base64 and URL encoding, JWT inspection, UUID and password generation, text diffing, timestamp conversion and SQL formatting — on fast pages with no sign-up. Each tool runs entirely in your browser, so the data you paste never touches a server.