78+ Free Developer Tools You'll Actually Use — No Signup Required

JSON is the lingua franca of modern APIs, and dealing with it should be painless. Our JSON suite covers the entire lifecycle — from formatting raw payloads to diffing two responses side-by-side. The JSON Formatter handles deeply nested structures with syntax highlighting and collapsible trees, while the Schema Validator lets you paste a JSON Schema and validate payloads against it in real time.

Need to move data between formats? The CSV ↔ JSON converter handles messy CSVs gracefully, and JSON ↔ YAML makes config file conversions trivial. The JSON Path Finder is particularly useful when you're exploring a large API response and need to extract the exact $.data.items[0].id path for your code.

The bread-and-butter utilities you reach for daily. Base64 Encode/Decode handles both text and file inputs — drag-and-drop an image and get the data URI instantly. URL Encoder/Decoder correctly handles Unicode and multi-byte characters, so you can debug query strings with confidence. The HTML Entities tool converts between named entities, numeric codes, and raw characters.

For content work, the Markdown Preview gives you a live, GitHub-flavored rendering with syntax highlighting. Text Diff provides a side-by-side comparison with line-level and character-level highlighting — perfect for comparing config files or API responses. And when you need placeholder content, Lorem Ipsum Generator produces paragraphs, sentences, or words on demand.

Whether you're shipping production code or trying to read someone else's, these tools have you covered. The CSS Minifier / Beautifier handles modern CSS including nested rules and custom properties. JavaScript Minifier strips whitespace and comments while the beautifier restores readable formatting with proper indentation.

The HTML Beautifier is a lifesaver when you're inspecting minified markup from a CMS or email template. And the SQL Formatter turns unreadable single-line queries into properly indented, keyword-highlighted SQL that you can actually review in a PR.

Sometimes you just need a thing — a UUID for a database seed, a secure password for a staging server, or a QR code for a demo. Our generators are fast and configurable. The UUID Generator supports v1, v4, and v7 formats, with bulk generation (up to 1000 at once) and one-click copy.

The Password Generator lets you dial in length, character sets, and entropy requirements — and shows you the estimated crack time in real time. QR Code Generator creates codes for URLs, text, Wi-Fi credentials, and vCards with customizable size and error correction. The CSS Gradient Generator gives you a visual editor with live preview and outputs clean CSS you can paste directly into your stylesheet.

Developers constantly juggle representations. The Color Converter seamlessly translates between HEX, RGB, HSL, and CMYK — with a visual picker so you can explore variations. The Unix Timestamp Converter parses timestamps in seconds and milliseconds, shows the human-readable date in multiple timezones, and lets you input dates to get timestamps back.

Image to Base64 converts uploaded images into data URIs ready for embedding in CSS or HTML — handy for email templates and small icons. The Number Base Converter handles binary, octal, decimal, and hexadecimal with support for arbitrary precision large numbers.

Security work demands tools you can trust — especially tools that don't send your tokens and hashes to a third-party server. The Hash Generator computes MD5, SHA-1, SHA-256, SHA-512, and HMAC hashes entirely in your browser using the Web Crypto API. Drag-and-drop file hashing is supported for verifying downloads and checksums.

The JWT Decoder is the tool you'll use most during auth debugging. Paste a token and instantly see the decoded header, payload, and signature — with expiration time highlighted and timezone-aware formatting. It detects expired tokens, validates structure, and highlights common claims like iss, sub, and exp. The Password Generator creates cryptographically secure passwords using crypto.getRandomValues().

CSS is where design meets code, and sometimes you need to see the output before you commit. The CSS Gradient Generator provides a visual editor for linear, radial, and conic gradients with multiple color stops, angle control, and real-time preview. It generates clean, cross-browser CSS with the correct vendor prefixes.

The Box Shadow Generator lets you layer multiple shadows, adjust offsets, blur, spread, and color — all with a live preview against different background colors. Combined with the Color Converter for finding the perfect palette, these tools eliminate the guess-and-refresh cycle of manual CSS tweaking.

Every developer has that moment: you know the concept, but you can't remember the exact syntax. Our cheat sheets are designed for exactly that — concise, scannable, and comprehensive. Each sheet covers a technology's most-used features with clear examples and organized categories.

The collection spans the full modern stack: Python, JavaScript, SQL, CSS, Git, Docker, Bash, TypeScript, React, HTML, and Linux. Whether you're a senior engineer who context-switches between languages daily or a junior dev building muscle memory, these are designed to be your tab-pinned reference.

Each cheat sheet is freely available online. For those who want an offline-ready, printable collection, we offer the complete bundle as a premium download.