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DevToolbox

A comprehensive collection of 100+ free, client-side developer tools. All processing happens in your browser – your data never leaves your device.

100% Client-Side
Privacy-First
No Installation
100% Free
JSON Formatter
Developer Tools

Format, validate, and beautify JSON data.

XML Formatter
Developer Tools

Format and beautify XML data.

CSS Formatter
Developer Tools

Beautify and format CSS code.

Base64 Encoder/Decoder
Developer Tools

Encode and decode text to and from Base64.

URL Encoder/Decoder
Developer Tools

Encode or decode strings for use in URLs.

URL Parser
Developer Tools

Parse a URL into its components (protocol, host, path, etc.).

Hash Generator
Developer Tools

Generate MD5, SHA1, SHA256, SHA512 hashes.

HMAC Generator
Developer Tools

Generate a keyed-hash message authentication code (HMAC).

Bcrypt Generator
Developer Tools

Hash and verify passwords with Bcrypt.

Checksum Calculator
Developer Tools

Calculate checksums like CRC32 for text.

JWT Decoder
Developer Tools

Decode and inspect JSON Web Tokens.

JWT Creator
Developer Tools

Create new JSON Web Tokens from scratch.

UUID Generator
Developer Tools

Generate universally unique identifiers (UUIDs).

Regex Tester
Developer Tools

Test regular expressions against strings.

HTML Encoder/Decoder
Developer Tools

Convert special characters to and from HTML entities.

HTML to Markdown
Developer Tools

Convert HTML content to Markdown.

HTML Stripper
Developer Tools

Remove HTML tags from a string.

HTML Minifier
Developer Tools

Minify HTML code to reduce file size.

CSS Minifier
Developer Tools

Minify CSS code to reduce file size.

JavaScript Minifier
Developer Tools

Minify JavaScript code using Terser.

SQL Formatter
Developer Tools

Beautify and format SQL queries.

Cron Job Parser
Developer Tools

Parse a cron string into a human-readable format.

Epoch Time Converter
Developer Tools

Convert between Unix timestamps and human-readable dates.

CSS Unit Converter
Developer Tools

Convert between px, em, rem, and pt.

Color Converter
Developer Tools

Convert between HEX, RGB, HSL, HWB, and CMYK.

Chmod Calculator
Developer Tools

Calculate Linux file permissions visually.

MIME Type Lookup
Developer Tools

Find the MIME type for a file extension.

Gzip Compressor
Developer Tools

Compress and decompress text using Gzip.

Screen Information
Developer Tools

Display screen resolution, color depth, etc.

User Agent Parser
Developer Tools

Display information from your browser user agent.

Keyboard Event Tester
Developer Tools

Inspect properties of keyboard events.

Image Compressor
File Tools

Compress JPG/PNG images to reduce file size.

Image Resizer
File Tools

Resize images to your desired dimensions.

Image Converter
File Tools

Convert images between PNG, JPEG, and WEBP.

ICO Converter
File Tools

Create a favicon.ico from an image file.

Image Color Palette Extractor
File Tools

Extract a color palette from an image.

PDF Merger/Splitter
File Tools

Merge multiple PDFs into one or split a PDF into parts.

CSV <=> JSON Converter
File Tools

Convert between CSV and JSON formats.

Image to Base64
File Tools

Convert an image file to a Base64 string.

Base64 to File
File Tools

Decode a Base64 string into a downloadable file.

Binary Viewer
File Tools

View the binary content of a file.

JSON <=> YAML Converter
File Tools

Convert data between JSON and YAML formats.

JSON <=> XML Converter
File Tools

Convert data between JSON and XML formats.

SVG to PNG / JPEG
File Tools

Convert SVG code or files to PNG or JPEG.

SVG to CSS
File Tools

Convert SVG to a CSS background-image.

Audio Spectrum Analyzer
File Tools

Visualize the frequency spectrum of an audio file.

QR Code Generator
Miscellaneous

Create QR codes from text or URLs.

Markdown Previewer
Miscellaneous

Write Markdown and see a live preview.

Color Tools
Miscellaneous

Color picker, gradient generator, and converters.

Password Generator
Miscellaneous

Generate strong, secure passwords.