Developer Tools

Format and beautify SQL queries for PostgreSQL, MySQL, SQL Server, SQLite, BigQuery and more, with uppercase keywords.

Beautify messy or minified HTML, CSS and JavaScript into clean, consistently indented code you can read and edit.

Convert Markdown to clean HTML — headings, lists, links, tables, code blocks and GitHub-flavored Markdown supported.

Convert HTML into clean Markdown for READMEs, docs and static sites — headings, links, lists, tables and code preserved.

Minify CSS or HTML to shrink file size — strips comments and whitespace and shows how many bytes you saved.

Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36 — including very large integers.

Format, beautify, validate and minify JSON — with clear line and column error messages and optional key sorting.

Convert YAML to JSON and JSON to YAML for Kubernetes, Docker Compose, GitHub Actions and other config files.

Pretty-print and validate XML with readable indentation, or minify it — errors point to the exact line and column.

Convert XML to JSON and JSON back to XML, keeping attributes (as @name) and repeated elements (as arrays).

Convert CSV or spreadsheet data to a JSON array of objects, with header detection, number/boolean typing and any delimiter.

Turn a JSON array of objects into CSV for Excel or Google Sheets — nested objects are flattened into dot-notation columns.

Generate SQL CREATE TABLE and INSERT statements from CSV data for MySQL, PostgreSQL, SQLite or SQL Server.

Convert config files between TOML, INI, .env and JSON — validate a TOML file or turn a .env into JSON in one step.

Generate TypeScript interfaces or Go structs from sample JSON — nested objects, arrays and optional fields inferred automatically.

Compare two JSON documents semantically — see added, removed and changed values by path, ignoring key order and formatting.

Query JSON with JSONPath expressions like $.store.book[*].author or $..price and see every match with its exact path.

Generate a JSON Schema (draft 2020-12) from sample JSON — types, nested objects, arrays, required fields and formats like email, date-time and URI.

Generate a production-ready Dockerfile and docker-compose.yml for Node.js, Python or static sites — with PostgreSQL, MySQL, Redis or MongoDB services.

Generate an nginx server block for a static site, SPA or reverse proxy — with HTTPS (Let's Encrypt paths), HTTP→HTTPS and www redirects, gzip and caching.

Paste raw email headers to trace the route, see delays between servers, and check SPF, DKIM and DMARC results — useful for spotting spoofed or phishing emails.

Check HTML for unclosed or mismatched tags, duplicate IDs, images without alt text, missing lang/title/viewport and other common mistakes.

Convert plain CSS declarations or rules into Tailwind CSS utility classes — spacing, flexbox, grid, typography, colors, borders and more, with arbitrary values where needed.

Encode text to Base64 or decode Base64 back to text, with full UTF-8 support and a URL-safe option.

Percent-encode text for URLs and query strings, or decode %20-style encoded URLs back into readable text.

Escape <, >, & and quotes as HTML entities, or decode named and numeric entities (&amp;, &#169;, &#x1F600;) back to text.

Escape or unescape strings for JavaScript, JSON, HTML, XML, SQL, CSV and regular expressions — quotes, backslashes and newlines handled.

Convert text to binary, hexadecimal, octal or decimal byte codes (UTF-8), and convert those codes back to text.

Generate MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512 and CRC32 checksums of any text, instantly and privately in your browser.

Create HMAC signatures with SHA-256, SHA-512, SHA-1 or MD5 from a message and secret key, as hex or Base64 — for webhooks and API signing.

Decode a JSON Web Token to read its header and payload, check expiry times, and verify HS256/384/512 signatures with your secret.

Minify JavaScript with Terser — removes whitespace and comments, shortens variable names and drops dead code to cut file size.

Look up every HTTP status code — 200, 301, 404, 429, 502 and more — with what it means and when servers send it.

Full ASCII table with decimal, hex, octal and binary codes for all 128 characters, control code names and HTML entities.

Time and space complexity of common data structures and sorting algorithms — average and worst cases in Big-O notation.

The Git commands you actually need — setup, branching, undoing mistakes, stashing, rebasing and working with remotes — with what each does.

Build a .gitignore file for your stack — Node, Python, Java, Go, Rust, .NET, Flutter plus OS and editor files — in a few clicks.

Generate Apache .htaccess 301 and 302 redirect rules from a list of old and new URLs, plus force-HTTPS and www rules.

Generate a modern HTML5 starter page with the viewport meta tag, SEO description, Open Graph tags, favicon and stylesheet links.

Convert Unix epoch timestamps (seconds, milliseconds, microseconds) to readable dates in any time zone — and dates back to timestamps.

Translate cron expressions into plain English and list the next run times — supports ranges, steps, names and @daily-style macros.

Convert Linux file permissions between numeric (755) and symbolic (rwxr-xr-x) notation, with a plain-English breakdown and the chmod command.

Calculate network address, broadcast, subnet mask, wildcard, usable host range and host count for any IPv4 address and CIDR prefix.

Compare two semantic versions, check whether a version satisfies an npm range like ^1.2.0 or ~2.3, and see the next major, minor and patch versions.

Test JavaScript regular expressions live — see every match highlighted, capture groups, named groups and match positions.

Convert cURL commands into JavaScript fetch, Python requests or Go net/http code — headers, JSON bodies, auth and methods included.

Design CSS box shadows, rounded corners and frosted-glass (glassmorphism) effects with sliders and a live preview — then copy the CSS.

See your browser, version, operating system, user agent, screen resolution, viewport size, pixel ratio, language, time zone and supported features — handy for bug reports.

Pick a color or paste any code and convert between HEX, RGB, HSL, HSV and CMYK — with tints, shades and ready-to-copy CSS values.

Generate harmonious color palettes — complementary, analogous, triadic, split-complementary and monochrome — from any base color, with CSS variables to copy.

Check text and background colors against WCAG 2.2 AA and AAA contrast requirements — with a live preview and a suggested fix when a pair fails.

Build linear, radial and conic CSS gradients visually — add color stops, set the angle and copy the CSS (or Tailwind class) with a live preview.

Build flexbox and CSS grid layouts visually — direction, wrap, alignment, gap, columns and rows — and copy the CSS or Tailwind classes.