Tools · 24 free utilities
Small tools,
done properly.
Everyday utilities for code, design, writing, time, and money. Each one runs entirely in your browser: no sign-up, no ads, and nothing you type leaves your device.
Developer
- JSON formatterFormat, minify, and validate JSON with exact error locations.
- Regex testerTest JavaScript regular expressions with live match highlighting.
- JWT decoderDecode a JSON Web Token's header and claims without sending it.
- Base64 & URL encoderEncode and decode Base64, Base64URL, and URL components.
- Unix timestamp converterConvert epoch seconds or milliseconds to dates and back.
- Text diffCompare two texts and see exactly what changed, line by line.
- Cron expression explainerRead a cron schedule in plain English and see its next runs.
- UUID & ULID generatorGenerate UUID v4, UUID v7, and ULID identifiers in bulk.
Security
Design
- Color contrast checkerCheck text and background colours against WCAG contrast.
- Color converterConvert between HEX, RGB, HSL, and OKLCH, with a tint scale.
- Fluid type calculatorBuild CSS clamp() values that scale smoothly between viewports.
- Image compressorShrink and resize images to WebP, JPEG, or PNG on your device.
- QR code generatorMake a QR code for any link or text, as SVG or PNG.