Developer tools that just work.

Write Markdown, export a styled PDF.

Write HTML, CSS, and JS with an instant preview.

Format, validate, minify, and diff JSON.

Convert text and files to and from Base64.

Test patterns with live match highlighting.

Encode, decode, and edit URLs and query strings.

Inspect headers, payloads, and expiry of any JWT.

Beautify and minify SQL for any dialect.

Convert epoch timestamps to dates and back.

MD5, SHA-1, SHA-256, SHA-512 from text or files.

Turn JSON into TypeScript interfaces or types.

Generate UUID v4, v7, or ULID identifiers in bulk.

Compare two pieces of text and see exactly what changed.

Strong, cryptographically random passwords — never leave your device.

Turn URLs, Wi-Fi logins, contacts, and more into PNG or SVG QR codes.

Pixel-perfect raster output at any size, with quality slider and clipboard copy.

Convert between HTML and Markdown.

Convert HEX, RGB, HSL, OKLCH, and generate palettes.

Build cron expressions visually with explanations.

Convert between YAML and JSON. Multi-document, indent control.

Convert CSV / TSV to JSON and back. Header detection, custom delimiters.

Shrink PNG, JPEG, and WebP — quality slider, side-by-side preview.

Build and sign JWTs with HS, RS, or ES keys — eight algorithms.

Generate placeholder text — words, sentences, paragraphs, or HTML.

Live word, character, sentence, and reading-time count.

Generate the full favicon set (ICO, PNG, Apple touch) from any image.

Paste a snippet, get a plain-English breakdown via on-device Gemini Nano.

Build linear, radial, and conic gradients with a visual editor — copy ready-to-use CSS.

Visually craft CSS box-shadows with offset, blur, spread, and inset — live preview + copy.

Paste a PEM certificate — inspect issuer, SANs, validity, and the full ASN.1 tree.

Paste Mermaid syntax — render flowcharts, sequence, ER, and gantt diagrams in your browser.

Generate and validate Australian Medicare card numbers using the official check-digit algorithm. Runs entirely in your browser.

Generate and validate Australian Business Numbers (ABN) for testing and development.

Generate and validate Australian Company Numbers (ACN) for testing and development.

Generate and validate Australian Tax File Numbers (TFN) for testing and development. Check-digit algorithm runs entirely in your browser.

Validate Australian Bank State Branch (BSB) numbers — checks format and bank code. Free, instant, runs in your browser.

Generate and validate New Zealand IRD (Inland Revenue Department) numbers for testing and development.

Generate and validate New Zealand Business Numbers (NZBN) — 13-digit identifiers used by NZ companies. Free, in your browser.

Validate New Zealand bank account numbers — checks format, bank code, and structure. Free, in your browser.

Generate or validate Indian PAN card numbers for testing. Extracts taxpayer type — runs entirely in your browser.

Generate or validate Indian GST Identification Numbers. Extracts state code, PAN, and entity type — runs in your browser.

Convert text between camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE, Title Case and more.

Convert numbers between binary, octal, decimal, and hexadecimal — instantly in your browser.

Format, validate, and minify XML documents. Supports pretty-printing with custom indentation.

Minify HTML, CSS, and JavaScript for production — strip comments, whitespace, and redundant code.

Hash and verify passwords using bcrypt — runs entirely in your browser, nothing sent to a server.

Convert HTML to valid JSX — fixes class→className, style objects, self-closing tags and more.

Generate RSA public/private key pairs for JWT RS256, SSH, and API authentication — uses Web Crypto API.

Generate and preview Open Graph, X Card, and standard meta tags for your web pages.

Turn code snippets into beautiful, shareable images — like carbon.now.sh, in your browser.

Paste or upload a sitemap XML — validate structure, lastmod format, URL limits, duplicates, and more against Google/W3C rules.

Complete reference for every HTTP status code — 1xx through 5xx. Search by number or keyword, expand any code for full details.

Convert PNG, JPG, WebP, and AVIF images in your browser — no upload, no signup. Batch convert with quality control.

Extract text from images, screenshots, and scanned documents — entirely in your browser. 18 languages supported.