Developer
The developer toolbox: JSON formatter, color conversion, Base64 and URL encoding, UUID, regular expressions… All in the browser, nothing is sent.
JSON formatter
Indent, minify and validate your JSON.
Color converter
Convert between HEX, RGB and HSL.
UUID generator
Generate random v4 UUIDs in bulk.
Base64 encoder / decoder
Encode and decode text to and from Base64.
URL encoder / decoder
Encode and decode URLs (percent-encoding).
Regex tester
Test your regex and highlight matches.
QR code generator
Create a QR code from any text or URL.
JSON ⇄ CSV converter
Convert between JSON and CSV both ways.
CSS gradient generator
Design a gradient and copy ready-to-use CSS code.
WCAG contrast checker
Test the accessibility of your text/background colors.
JWT decoder
Inspect a JWT token’s header and claims.
Cron expression parser
Translate a crontab into plain words and see the next runs.
HTML entities
Encode and decode HTML entities, named or numeric.
CSS minifier
Compress or beautify your CSS, with the byte savings.
SQL formatter
Format your SQL queries: keywords and indentation.
XML formatter
Indent and validate your XML, errors flagged.
String escaper
One string, escaped for JSON, JS, HTML, URL and Base64 at once.
Subnet calculator
IP + CIDR → network, broadcast, host range and masks.
Chmod calculator
Tick the rwx permissions: octal and symbolic notation live.
URL parser
Break down a URL: protocol, host, path and decoded parameters.
HTTP status codes
Look up an HTTP code: meaning and when to use it.
User-Agent parser
Browser, OS and engine extracted from a User-Agent string.
ULID & NanoID generator
Unique time-sortable identifiers, an alternative to UUID.
JSON to TypeScript
Turn a JSON object into typed TypeScript interfaces.
CSV to Markdown table
Convert CSV into a Markdown table, with alignments.
Meta tags generator
Title, description, Open Graph and Twitter, with a social card preview.
Robots.txt generator
Create a robots.txt file: agents, permissions, sitemap.
Box-shadow generator
Compose multi-layer CSS shadows with a live preview.
Border-radius generator
Round corners and create organic blob shapes.
Hex viewer
Inspect a file in hex and ASCII, type detected from magic bytes.
MIME types
Find the MIME type for an extension, and vice versa.
SVG cleaner
Shrink an SVG: remove comments, metadata and whitespace, see the savings.
JSON diff
Compare two JSON and spot additions, removals and changes.
px to rem converter
Convert CSS units px, rem, em, pt and % with a configurable base.
Unicode character inspector
Break down each character: U+ code point, decimal, UTF-8 bytes, HTML entity.
Cubic-bezier generator
Craft a CSS animation easing curve by dragging the handles, with an animated preview.
Flexbox generator
Tune a Flexbox container live and copy the ready-to-use CSS.
Text-shadow generator
Compose multi-layer text shadows with a live preview and copy-ready CSS.
Glassmorphism generator
Create a frosted-glass effect (background blur) with live preview and copy-ready CSS.
CSS Grid generator
Build a CSS grid (columns, rows, gap) live and copy the CSS.
CSS clamp() generator
Generate a fluid CSS clamp() size (responsive typography) between two screen widths.
What is my IP address
See your public IP address (IPv4/IPv6) and your connection details.
JSON to YAML
Convert JSON into readable YAML with clean indentation. Ideal for config files.
CSV to JSON
Convert CSV into JSON (array of objects), with adjustable headers and delimiter.
CSV editor
Edit a CSV like a spreadsheet: cells, rows, columns, sort, export.
Markdown table generator
An editable grid → a ready-to-paste Markdown table.
SRT subtitle editor
Edit and resync your .srt subtitles.
Rich text editor → HTML
Write visually, get clean HTML code.
CSS pattern generator
Pure-CSS background patterns (stripes, dots, checkerboard).
Font subsetter and inspector: shrink TTF, OTF and WOFF web fonts
Inspect a font, keep only the characters you need, export TTF and WOFF.