The Ultimate Free Developer Toolkit
Format JSON, encode Base64, test RegEx, decode JWTs, minify code, and more â all instantly in your browser. Your data never touches a server.
All Tools
JSON Formatter & Validator
Format, minify, validate, and convert JSON data. Inspect tree views, run visual diff comparisons, or convert JSON to CSV instantly.
Open ToolBase64 Encoder & Decoder
Encode or decode raw text, convert images to Base64 data URLs, decode files, or preview generated images completely in the browser.
Open ToolURL Encoder & Decoder
Perform URL percent encoding and decoding, batch process multiple URLs, parse query string parameters into structured tables, and build UTM campaigns.
Open ToolRegEx Tester & AI Generator
Test regular expressions with live match highlighting, capture group details, and cheat sheets. Generate complex expressions from English descriptions using AI.
Open ToolJWT Decoder & Debugger
Decode, verify, and inspect JSON Web Token headers, payloads, and signatures. Track token expiration timers and generate test tokens locally.
Open ToolCSS / JS / HTML Minifier & Beautifier
Compress or format CSS, Javascript, and HTML files. View real-time file size savings, batch upload resources, and retrieve production-ready minified code.
Open ToolMarkdown Editor & README Creator
Write Markdown code with split-screen real-time preview. Use professional templates to compile outstanding GitHub README profiles and download outputs.
Open ToolColor Converter & Palette Picker
Pick colors, build modern gradients, extract palettes from images, verify WCAG accessibility contrast scores, and convert HEX, RGB, HSL, and CMYK formats.
Open ToolUnix Epoch Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Adjust timezone settings, evaluate relative times, and parse cron expressions.
Open ToolHash & HMAC Generator
Generate secure cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) and HMAC keys. Calculate hashes of local files safely and privately.
Open ToolWhy Developers Choose ToolsHub
100% Client-Side Privacy
Unlike other online utilities, ToolsHub performs all operations directly in your browser. Your JSON data, JWT tokens, and encoded strings never travel across the network. Your privacy is guaranteed by design.
Sub-millisecond Execution
Because all code runs client-side with zero network latency, execution is instant. Large-scale formatting and code compression are processed via the Web Crypto API and optimized algorithms for absolute speed.
Premium Responsive Design
Designed with a premium dark theme and dynamic focus states, ToolsHub is fully optimized for desktop, tablet, and mobile views. Keep it pinned in your browser sidebar for instant access.
10+ Professional Utilities
From JSON formatting to cryptographic hash generation, ToolsHub covers every common developer workflow in one unified, fast-loading site. No more switching between dozens of bookmark tabs.
Free Online Developer Tools â Trusted by Thousands of Engineers
JSON Formatter & Validator
Our JSON Formatter lets you paste raw JSON and instantly beautify, minify, or validate it. View your data as an interactive tree, perform visual diffs, or convert JSON to CSV â all without sending a single byte to any server. Whether you're debugging API responses or cleaning up configuration files, this tool handles it in milliseconds.
Base64 Encoder & Decoder
The Base64 tool handles text encoding/decoding, image-to-Base64 conversion, and file processing entirely in-browser. Perfect for embedding images in CSS, encoding authentication headers, or decoding opaque data payloads from APIs and email headers.
URL Encoder & RegEx Tester
Our URL Encoder/Decoder handles percent encoding, query string parsing, and UTM campaign building. Pair it with the RegEx Tester for live match highlighting, capture group inspection, and an AI-powered pattern generator that converts plain English into working regular expressions.
JWT Decoder & Hash Generator
Inspect JSON Web Tokens by pasting them to see decoded headers, payloads, and signature verification. Use the Hash Generator to compute MD5, SHA-1, SHA-256, and SHA-512 checksums for text or files using the browser's native Web Crypto API â with HMAC support for keyed hashing.