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Every developer tool
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Format, convert, validate and debug — fast. No sign-up needed, no data leaves your device.

DevToolsHub is a free, privacy-first collection of 28+ developer utilities — formatters, encoders, converters, generators and inspectors — in one place, with instant live output as you type. Everything runs entirely in your browser, so your data never leaves your device: no sign-up, no tracking, nothing to install. Search or pick a category to get started.

Formatters

6

Format, validate and minify JSON — live.

Beautify SQL queries with keyword casing.

Beautify and indent HTML.

Beautify or minify CSS.

Markdown Editor

Write Markdown with live preview and toolbar.

Validate JSON and pinpoint errors.

Encoders

3

Base64 Encode / Decode

Encode or decode Base64 with Unicode support.

URL Encode / Decode

Percent-encode or decode URLs.

HTML Entity Encoder

Encode or decode HTML entities.

Converters

8

Timestamp Converter

Convert between Unix timestamps and dates.

Number Base Converter

Convert between binary, octal, decimal and hex.

Color Converter

Convert between HEX, RGB, HSL and HSV.

Convert text between casing styles.

JSON → TypeScript

Generate TypeScript interfaces from JSON.

JSON → GraphQL

Generate GraphQL types from JSON.

Convert between YAML and JSON.

Convert CSV data to a JSON array.

Generators

6

Generate RFC4122 v4 UUIDs in bulk.

Password Generator

Generate strong random passwords.

Lorem Ipsum Generator

Generate placeholder text.

Generate SHA-1/256/384/512 checksums.

Build and preview cron schedules.

Generate placeholder text in multiple languages.

Inspectors

5

Decode and inspect JSON Web Tokens.

Test regular expressions and view matches.

HTTP Status Codes

Reference for HTTP response status codes.

Compare two blocks of text line by line.

Send HTTP requests and inspect responses.