Tegmen
Learn more about TegmenFree web tools for development, design, text and files: format JSON, test a regex, check a contrast ratio, compress an image… Everything runs in your browser, with no sign-up and without sending your data to a server.
Developer
JSON, regex, tokens, encoding and identifiers
JSON Array Comparator
Compare two JSON lists or objects, detect differences, and use ergonomic filters.
Regex Tester
Write and test regex live, with match highlighting and captured group explanations.
JSON Formatter/Minifier
Paste JSON to get a formatted, validated, or minified version, with syntax error detection.
Base64 Encoder/Decoder
Transform text or files to Base64 and vice versa, with automatic verification.
ID Generator
Generate UUID v4/v7/v1, NanoIDs, or custom strings with configurable alphabet and length.
JWT Decoder & Encoder
Decode and encode JWT tokens (HS256). Inspect header, payload, and expiration claims. 100% local, no token is ever sent to a server.
URL Parser
Break down a URL into its components (protocol, host, path, params) and encode or decode URI values.
Timestamp Converter
Convert a Unix timestamp to a human-readable date and back. Automatically detects seconds and milliseconds.
Colors & Design
Colors, palettes, contrast and typography
Contrast Calculator
Check contrast between text and background according to WCAG standards and find accessible alternatives.
Color Inspector
Pick a color and instantly get all its codes: HEX, RGB, HSL, HSV, CMYK, LAB, CSS name and luminance.
Typography Guide
Create and visualize your font guide with headlines, paragraphs, and labels.
Palette Generator
Generate harmonious color palettes from a base color. Pick a harmony, adjust the count, and export in CSS, SCSS, Tailwind, or JSON.
Text
Writing, counting and previewing
Lorem Ipsum Generator
Generate Lorem Ipsum or structured dummy content (titles, paragraphs, lists) for your mockups.
Markdown Previewer
Edit Markdown and view HTML rendering in real-time, with light/dark theme support.
Word Counter
Analyze your text: words, characters, sentences, paragraphs and estimated reading time.
Files & Productivity
Clipboard and file inspection
CopyBoard
A workspace to easily paste, organize, and rearrange notes, images, files, and links. Supports drag & drop between columns.
File Inspector
Complete analysis of any file: dimensions, color palette, EXIF metadata, SHA-256 hash, text statistics, media duration, and more.
Image compressor
Shrink the size of your images (PNG, JPEG, WebP) right in your browser, with nothing ever uploaded to a server.
Image converter
Convert your images between PNG, JPEG, WebP and ICO right in your browser (including HEIC/HEIF and SVG) with nothing ever uploaded to a server.