Developer tools, one file each. No build step. No dependencies. No frameworks.
Analyze meta tags, social previews, and SEO metadata for any URL with actionable scores.
Visually create CSS border-radius values with live preview, presets, and copy-ready CSS output.
Generate random v4 UUIDs instantly, offline.
A collection of useful developer tools, each built as a single, self-contained HTML file. No build step. No dependencies. No frameworks.
Analyze meta tags, social previews, and SEO metadata for any URL with actionable scores.
Visually create CSS border-radius values with live preview, presets, and copy-ready CSS output.
Generate random v4 UUIDs instantly, offline.
Try a tool right here. Every tool is a single HTML file you can download and use anywhere.
Formatted output will appear here...
Meta tags, OG previews, sitemaps, and SEO utilities
1 toolDimensions, converters, SVG, favicons, and metadata
0 toolsPickers, contrast checkers, palettes, and converters
0 toolsShadows, grids, flexbox, gradients, and generators
1 toolCounters, converters, diffs, and Markdown preview
0 toolsFormatters, JWT decoders, URL encoders, and curl builders
0 toolsUUIDs, hashes, regex, cron, passwords, and QR codes
1 toolUser agents, viewport info, cookies, and headers
0 toolsContrast checkers, heading structure, ARIA references
0 tools
___ _ _ ___ ___ ___ _ ___ _____ ___ ___ _ ___
/ _ \| \| | __| | __|_ _| | | __| |_ _/ _ \ / _ \| | / __|
| (_) | .` | _| | _| | || |__| _| | || (_) | (_) | |__\__ \
\___/|_|\_|___| |_| |___|____|___| |_| \___/ \___/|____|___/
Developer tools, one file each. Zero dependencies.
Developer tools, one file each. No build step. No dependencies. No frameworks.
Pick a tool, build it in a single HTML file, and submit a PR.
This project is part of Social Summer of Code. Pick an Easy (20 pts) or Medium (30 pts) issue, build a tool, and earn contribution points. Learn more · Leaderboard