Small tools that do one thing.
Some useful, some not. Every one of them runs entirely in your browser. No accounts, no uploads, no server doing the work. View source if you like.
Money
2 toolsTime
3 tools- How Many Days Old Am I Your age in days, weeks and whole months, the weekday you were born on, and the dates the round numbers land on.
- Unix Timestamp Converter A timestamp into a date and back, in seconds, milliseconds, microseconds or nanoseconds, UTC and local.
- Asymptotic Stopwatch Runs at true speed, then slows so it approaches your target time without reaching it.
Units
4 tools- Absurd Unit Converter Measurements restated in blue whales, boulders, eagles and swimming pools.
- Indian Land Area Converter Bigha, kanal, marla, guntha, cent and gaj in square metres and feet, with the state convention it used printed underneath.
- Ohm's Law Calculator Any two of volts, amps, ohms and watts give the other two, with the power checked three ways on the page.
- Decibel Converter dBm, dBW, watts, dBi, dBd and EIRP, keeping absolute powers and ratios apart.
Developer
7 tools- Hex and RGB Converter A colour in hex, rgb(), hsl(), HSB and CMYK, either direction, with its contrast ratios.
- URL Encoder and Decoder Percent-encoding in the four conventions that disagree, and a URL taken apart into its pieces.
- JWT Decoder Read a token's header and claims without pasting it into someone else's server.
- Cron Expression Explainer Plain English, plus the next ten times it actually fires.
- Regex Tester Live match highlighting, capture groups and a replacement preview.
- Text Diff Compare two pasted blobs line by line, with the unchanged parts folded away.
- SVG Path Optimizer Shortens a d attribute, then samples both curves to prove the shape did not move.
Media
5 tools- Aspect Ratio Calculator Resize at a fixed ratio or reduce a size to one, with the rounding, the even sizes and the letterbox bars all stated.
- Image Format Converter PNG, JPEG and WebP in any direction, with the output size shown as you drag the quality slider.
- EXIF Viewer and Stripper Shows what a photo knows about where it was taken, and removes it without recompressing.
- Video to GIF A few seconds of a video as an animated GIF, which then reads itself back to prove it decodes.
- Favicon Set Generator One square image in, the whole set out as a zip, with the manifest and the link block.