Developer Tools

Browser-based WYSIWYG HTML editor with formatting toolbar and live HTML source view. Paste rich text, edit, copy clean HTML.

Format, minify, and validate JSON instantly. 2/4-space or tab indent. Shows precise error location. Runs in your browser.

Convert Markdown to clean HTML with live preview. Supports headings, lists, links, code blocks, blockquotes, emphasis.

Compare two blocks of text line by line. See added, deleted, and unchanged lines highlighted. Browser-based.

Decode JSON Web Tokens (JWT) in your browser. View header, payload, and expiry. Signature shown but not verified.

Convert CSV to JSON (array of objects) or JSON to CSV. Custom delimiter, header detection, quoted fields supported.

Test JavaScript regular expressions live — highlights matches in your text and lists captured groups. All flags supported.

Convert between HEX, RGB, HSL, and RGBA color formats. Live color picker, all formats stay in sync. Browser-based.

Convert numbers between decimal, hex, binary, octal, and any base 2-36. All four common bases stay in sync.

Compare two JSON values structurally. Shows added, removed, and changed keys with full paths. Browser-based.

Build cron expressions with a 5-field editor. See plain-English description and the next 5 fire times in your local timezone.

Generate SEO meta tags + Open Graph + Twitter Card tags for any page. Live SERP preview. Browser-based.

Generate color palettes from a base color — complementary, analogous, triadic, tetradic, monochromatic, shades, tints. Live swatches + CSS variables export.

Visual CSS gradient builder. Linear, radial, conic. Unlimited color stops, live preview, one-click copy of the CSS.

Visual builder for CSS box-shadow. Tune offset, blur, spread, color, opacity. Inset support. Live preview.

Build Markdown tables visually — click cells to edit, set alignment, import from CSV. Live preview and copy.

Check WCAG 2.1 contrast ratio between two colors. AA & AAA pass/fail for normal and large text. Live preview, swap, invert.

Format SQL queries — supports PostgreSQL, MySQL, BigQuery, Snowflake, T-SQL and more. Pick keyword case, indent, and dialect. Minify too.

Format, validate, and convert YAML — pretty-print, sort keys, convert YAML ↔ JSON. Browser-based, no upload.

Paste JSON, get clean TypeScript interfaces (or type aliases). Optional readonly, optional props, custom root name.

Paste a cron expression, get a human-readable description, a field-by-field breakdown, and the next 10 scheduled runs in your local time.

Generate Shields.io-style SVG badges for GitHub READMEs. Custom labels, colors, styles (flat / square / for-the-badge / plastic). Download SVG.

Build & sign JSON Web Tokens client-side using HMAC SHA-256, 384, or 512. Web Crypto API — your secret never leaves your browser.

Look up the MIME type for any file extension (or reverse: find extensions for a MIME). 90+ types covered.

Paste JSON and instantly generate Go struct definitions with json struct tags, omitempty, and pointer-for-optional support. Runs entirely in your browser.

Generate a JSON Schema (draft 2020-12, 2019-09, or draft-07) from a JSON sample — with auto-detected types, examples, and format hints (email, uri, date-time).

Convert a JSON sample to a Zod schema with TypeScript type inference — auto-detects email, url, uuid, datetime, and integer fields.

Paste HTML and get clean Markdown — headings, links, lists, blockquotes, tables, fenced code blocks. Browser-based, no upload.

Pick any color and get its HEX, RGB, HSL, and HSV values instantly. Free online color picker with eyedropper and color harmony.

Generate .htaccess rules for Apache web servers. Create redirects, password protection, caching, hotlink protection, and more. Free online tool.

Minify CSS code online. Remove comments, whitespace, and unnecessary characters to reduce file size. Free CSS minifier — instant results.

Minify HTML code online. Remove comments, collapse whitespace, and reduce file size. Free HTML minifier — instant results in your browser.

Parse any URL into its components: protocol, hostname, port, path, query parameters, and hash. Free online URL parser tool.

Parse user agent strings to identify browser, operating system, and device type. Free online user agent parser with instant results.

Read and decode QR codes from uploaded images. Drag and drop or paste a QR code image to extract the encoded data. Free online QR decoder.

Look up MIME types by file extension or find extensions by MIME type. Comprehensive database of 160+ common file types. Free online tool.

Minify JavaScript code online. Remove comments, whitespace, console.log, and debugger statements. Free JS minifier with compression stats.

Convert between RGB, HEX, HSL, and RGBA color formats instantly. Live color preview with color picker. Free online color format converter.

Generate HTML table markup from delimited text data. Supports tab, comma, CSV, and custom delimiters. Free online HTML table generator.

Free online barcode and QR code reader. Upload an image to decode barcodes including QR, EAN-13, UPC-A, Code 128, Code 39, and more. Runs in your browser.

Free online file MIME type checker. Upload any file to detect its MIME type, file extension, description, and size.

Ferramenta gratuita de comparação de textos lado a lado. Destaque diferenças de linhas e caracteres adicionados ou excluídos instantaneamente no seu navegador.