Developer Tools

Format, validate, and minify JSON data with syntax highlighting

Encode text to Base64 and decode Base64 strings

Encode and decode URL components and query strings

Generate random UUID v4 identifiers

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text

Test and debug regular expressions with match highlighting

Decode and inspect JWT token header and payload

Beautify and format HTML code with proper indentation

Minify CSS code by removing whitespace and comments

Minify JavaScript code to reduce file size

Format and beautify SQL queries with proper indentation

Format and validate XML documents with syntax highlighting

Convert YAML to JSON and JSON to YAML format

Convert common TOML config files to JSON and JSON objects back to TOML in your browser

Parse browser user-agent strings to detect browser, OS, device type, rendering engine, architecture, and bots

Live preview of Markdown with syntax highlighting

Compare two texts and highlight differences side by side

Build and validate cron expressions with human-readable descriptions

Convert colors between HEX, RGB, HSL, and other formats

Convert CSV with headers to JSON objects, or arrays of objects back to CSV

Convert a cURL command to JavaScript fetch, Python requests, Go, PHP, or Axios

Run JavaScript in your browser with a live console — supports top-level await, DOM manipulation, Fetch API, and shareable permalinks

Upload a .har file and visualize request waterfall, timings, sizes, and headers — like browser DevTools, in your browser

Build a full URL with query parameters; values are encoded for safe sharing

Convert Unix timestamps to human-readable dates and times in multiple formats

Convert numbers between binary, octal, decimal, and hexadecimal bases

Convert numbers between any base — binary, octal, decimal, hex, Base32, Base36, Base58 (Bitcoin), Base62, and custom alphabets, with BigInt support, two's complement, and ASCII interpretation

Generate complementary, analogous, triadic, and monochromatic color palettes from any base color

Create beautiful linear and radial CSS gradients with a live preview

Parse and understand cron expressions with human-readable descriptions and next run times

Parse and analyze HTTP response headers with descriptions and security insights

Generate Apache .htaccess rules for HTTPS redirects, caching, GZIP, and security

Test and validate robots.txt rules online — check whether URLs are allowed or blocked for Googlebot, Bingbot, and other crawlers.

Convert CSV data into a formatted Markdown table with alignment options

Generate .env and .env.example files visually with templates for Node.js, Next.js, and Vite projects

Convert any JSON object to a Zod schema with smart type inference for email, URL, datetime, and more

Build multi-layer CSS box shadows visually with live preview — copy the CSS with one click

Build flexbox layouts visually — control direction, wrap, alignment, and per-item properties with a live preview and copy-ready CSS

Design CSS Grid layouts visually — set columns, rows, gaps, spans, and alignment with a live preview and instant CSS output

Generate .gitignore files for any tech stack — Node, Python, React, Go, Java, and 30+ more

Check WCAG 2.1 AA/AAA color contrast ratios for accessible web design

Turn code into beautiful shareable images with syntax highlighting, themes, and window chrome — like carbon.now.sh

Test every key on your keyboard — check for stuck, missing, or malfunctioning keys with a visual layout

Generate production-ready Dockerfiles for Node.js, Python, Go, Java, Rust, and more with multi-stage builds and best practices

Generate a professional GitHub README.md with badges, features, installation, usage, and license sections

Convert JSON arrays of objects to CSV format with custom separators and download

Validate JSON data against a JSON Schema with detailed error reporting

Encode special characters to HTML entities and decode HTML entities back to text

Paste JSON and instantly get TypeScript interfaces or type aliases with nested types

Convert vanilla CSS to Tailwind utility classes and Tailwind classes back to CSS

Paste JSON and click any value to get its JSONPath in bracket or dot notation

Build and send HTTP requests visually with headers, query params, body, and auto-generated cURL/fetch code

Generate Nginx server blocks with SSL, reverse proxy, gzip, security headers, CORS, and rate limiting

Build docker-compose.yml visually with pre-built templates for PostgreSQL, Redis, MongoDB, Nginx, and more

Calculate Unix file permissions in octal, symbolic, and command format with an interactive grid

Optimize and minify SVG files by removing comments, metadata, editor attributes, and unnecessary whitespace

Generate signed JSON Web Tokens (JWT) with HS256 using the WebCrypto API, right in your browser

Complete reference for all HTTP status codes — descriptions, use cases, and common causes for every 1xx–5xx code

Convert JSON arrays of objects to SQL INSERT statements — choose your database dialect and table name

Complete ASCII and Unicode character table with decimal, hex, octal, binary values and HTML entities

Open SQLite .db and .sqlite files online — browse tables, inspect schema, run SQL queries, and export CSV in your browser

Test every mouse button, scroll wheel, movement, and DPI — visual click map and event log

Measure your typing speed in WPM and accuracy — multiple difficulty levels and passage lengths

View your screen resolution, viewport size, DPI, color depth, refresh rate, and device pixel ratio

Build Markdown tables visually — add rows and columns, set alignment, and copy the formatted output instantly

Generate HTTP security headers for HSTS, CSP, X-Frame-Options, CORS and more — export for Nginx, Apache, Express, or Next.js

Convert between px, rem, em, pt, cm, mm, vw, vh, and % — with adjustable root font size, parent size, and viewport

Break any URL into its components — protocol, subdomain, domain, port, path, query params, and hash with color-coded visualization

Searchable reference for 100+ git commands — setup, branching, merging, stashing, rebasing, remotes, and advanced tips with one-click copy

Interactive regular expression reference with live tester — anchors, character classes, quantifiers, groups, lookaheads, flags, and common patterns

Get a unique URL, send HTTP requests to it, and inspect every request's headers, body, method, and query params in real time — no sign-up, localStorage-backed

Connect to any ws:// or wss:// endpoint, send messages, and inspect live frames in real time

Convert a WebSocket connection to cURL handshake, wscat, websocat, JavaScript, or Python code

Enter your screen diagonal and resolution to calculate pixels-per-inch (PPI/DPI) and see how it compares to Retina, 1080p, 4K, and common phone displays

Pick two Google Fonts and preview them together as heading + body to find the perfect typographic combination

Searchable reference for 90+ conda commands — environments, packages, channels, export, mamba, Jupyter kernels, and advanced tips with one-click copy

Searchable reference for 200+ Redis commands — strings, hashes, lists, sets, sorted sets, pub/sub, streams, Lua scripting, cluster, ACL, and cli tips with one-click copy

Build GitHub Actions workflows visually — configure triggers, jobs, matrix strategy, services, 20+ popular actions, and download production-ready YAML

Visualize regular expressions as railroad diagrams — parse, explore, and export SVG diagrams for any regex pattern

Test browser notifications and the Web Notifications API with custom title, body, icon, tag, delay, permission flow, and device behavior

Build OpenAPI 3.0 YAML specs visually — add servers, paths, endpoints, parameters, request bodies, and responses with live preview and export

Detect device info online — browser, OS, screen resolution, user agent, GPU, battery, network, storage, APIs, and permissions