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LeetTools.dev

Fast, private, client-side developer tools for JSON, JWT, Base64, passwords, UUIDs, and archives.

Run useful developer tools in your browser with a privacy-first workflow and no server-side processing for supported tools.

All Tools

Browse the full toolbox by category. LeetTools.dev includes generators, formatters, encoders and decoders, and archive utilities for everyday engineering workflows.

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Generators

Password Generator

Instantly generate secure, random passwords on LeetTools.dev. Create strong, unique passwords locally in your browser.

OPEN TOOL
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Passphrase Generator (XKCD)

Generate memorable, high-entropy passphrases based on the XKCD method. Secure, random, and easy to remember.

OPEN TOOL
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Username Generator

Generate creative, cool, and anonymous usernames for games, social media, and developer accounts.

OPEN TOOL
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UUID / GUID Generator

Generate UUID v4 (random) and v7 (time-ordered) locally in your browser. Batch copy, formatting options, no server.

OPEN TOOL
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Formatters

JSON Formatter & Validator

Professional, real-time JSON formatter and validator. Prettify, minify, and debug JSON data instantly with a master-class editor.

OPEN TOOL
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Encoders & Decoders

JWT Debugger

Secure, client-side JSON Web Token debugger. Decode, verify, and analyze JWT headers and payloads instantly in your browser.

OPEN TOOL
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Base64 & Base Converter

A powerful, all-in-one suite for Base64, Base32, Base58, and Base62 encoding. Fast, secure, and client-side text conversion in your browser.

OPEN TOOL
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Archives

Archive Extractor

Browse and extract Zip, 7z, RAR, Tar, and more in your browser. Your file never leaves this device. A password field appears only when you might need it.

OPEN TOOL
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Archive to Zip

Turn RAR, 7z, Tar, and other archives into a single .zip download in your browser. Your file stays on this device.

OPEN TOOL
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Zip Creator

Combine files into a single .zip download. Add an optional password if you want the archive protected. Nothing is uploaded—everything stays on your device. Other archive types (tar, 7z, …) are not offered here.

OPEN TOOL
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Why LeetTools

LeetTools.dev is built for developers who want quick results without sending working data to third-party services. For supported tools, processing happens locally in the browser, which helps reduce privacy risk and keeps workflows fast.

The toolbox covers common tasks such as formatting JSON, decoding JWTs, converting Base64, generating strong passwords, creating UUIDs, and working with archive files. Each tool page also includes supporting reference content so the page stays useful beyond the interactive UI.