50+ tools — all free, all client-side

DevToolbox

A comprehensive collection of developer tools. All processing happens in your browser — your data never leaves your device.

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50+
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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.