Developer utilities, all in one place

Encode text or files to Base64, or decode Base64 back to its original form, entirely in your browser.

Encode or decode full URLs or individual query parameters using percent-encoding.

Convert special characters like <, >, & and quotes to and from HTML entities.

Paste a JWT to instantly split and inspect its header, payload, and signature.

Beautify, minify, and validate JSON with error line highlighting and a collapsible tree view.

Beautify or minify XML with adjustable indentation and validation error location.

Beautify SQL for MySQL, PostgreSQL, and SQL Server with keyword case and indent options.

Convert between YAML and JSON in both directions with error highlighting.

Convert CSV to JSON or JSON to CSV with custom delimiters and a live table preview.

Generate v1 or v4 UUIDs in bulk with case and hyphen formatting options.

Generate strong random passwords with a strength meter and full character-set control.

Generate placeholder text by paragraphs, sentences, or words, with optional HTML tags.

Compute MD5, SHA-1, SHA-256, and SHA-512 hashes for text or files, and compare two hashes.

Generate QR codes for text, URLs, Wi-Fi credentials, or vCards, and export as PNG or SVG.

Convert text between UPPER, lower, Title Case, camelCase, snake_case, kebab-case, and PascalCase.

Count words, characters, sentences, and paragraphs live as you type, with a reading-time estimate.

Compare two blocks of text side by side or inline, with word- or line-level highlighting.

Find and replace text with optional regex, case sensitivity, and step-through control.

Escape or unescape strings for JSON, JavaScript, or SQL contexts.

Build cron expressions visually and see a plain-English explanation with upcoming run times.

Test regular expressions with live match highlighting, capture groups, and a cheat sheet.

Convert between Unix timestamps and human-readable dates across time zones.

Convert colors between HEX, RGB, HSL, and CMYK, generate palettes, and check contrast.

Write GitHub-flavored Markdown and see a live-rendered preview side by side.

See your own public IP address, or look up approximate location and network info for any IP.

Query A, AAAA, MX, TXT, NS, CNAME, and SOA records for any domain.

Fetch any URL and inspect its response status and HTTP headers.

Paste a User-Agent string to break it down into browser, engine, OS, and device info.

Generate SEO and Open Graph/Twitter Card meta tags for a webpage, with a live preview.

Upload an image and generate every standard favicon size, plus the HTML to include them.

Build a robots.txt visually, or paste one in to check it for common mistakes.

Check whether a URL's CORS headers would allow a browser request from another origin.

Compress an image in your browser by adjusting quality, with a live before/after size comparison.

Convert an image between PNG, JPG, and WebP entirely in your browser.

Convert an image to a Base64 data URI, or decode a data URI back into a downloadable image.

Shrink SVG markup by removing unnecessary metadata, comments, and precision.

View a photo's embedded EXIF metadata (camera, GPS, timestamps), or strip it before sharing.

Convert numbers between binary, octal, decimal, and hexadecimal simultaneously.

Convert between units of length, weight, and temperature.

Calculate percentages, percentage change, and reverse percentage problems.

Generate random numbers in a range, in bulk, with an optional reproducible seed.