Dev Atlas
Tool directory

Free browser-side developer tools.

Browse Dev Atlas utilities by workflow. Current tools run locally in your browser and focus on fast debugging, encoding, decoding, formatting, generation, and conversion tasks.

Formatters

Clean up structured data, stylesheets, and code snippets.

Available

JSON Formatter

Format, minify, and validate JSON locally with readable parsing feedback.

New

CSS Minifier

Format and minify CSS snippets locally for quick cleanup and debugging.

New

JavaScript Minifier

Format and minify JavaScript snippets locally for fast inspection.

Encoders

Encode and decode common web-safe text formats.

New

Base64 Encoder

Encode UTF-8 text to Base64 and decode Base64 strings locally.

New

URL Encoder

Encode and decode URL components for paths and query strings.

New

HTML Entity Encoder

Escape HTML-sensitive characters and decode HTML entities.

Inspectors

Inspect tokens, patterns, hashes, and schedules.

Available

JWT Decoder

Decode JWT header and payload locally, including issued-at and expiration timestamps.

New

Regex Tester

Test JavaScript regular expressions and inspect matches locally.

New

Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from local text input.

New

Cron Parser

Parse five-field cron expressions and preview upcoming runs.

Converters

Move between common data formats, time values, and colors.

Available

Timestamp Converter

Convert Unix seconds, Unix milliseconds, ISO strings, local time, and UTC time.

New

Color Converter

Convert HEX, RGB, and HSL colors and preview CSS color values.

Generators

Create development identifiers and fixture values.

New

UUID Generator

Generate random UUID v4 values for test data and local identifiers.