Tools

11 tools, every one of them running in your browser. There is no server behind this site, so there is nowhere for your input to go — paste a real token if you want to, it stays on your machine.

dp ↔ px

Convert between dp and px across every Android density, including the two the generic converters leave out.

convert androiddensitylayout
Colour ↔ Kotlin Int

Why your red is -65536. Convert between hex, ARGB, and the signed 32-bit integer Android actually stores.

convert androidcolourkotlin
Epoch ↔ date

Paste a timestamp and it works out the unit — seconds, millis, micros or nanos. Reads Perfetto traces directly.

convert androidperfettotime
JWT decode

Read a token’s header and payload, with expiry times in UTC and Jakarta — and a clear verdict on whether it is still valid.

inspect jwtauthdebugging
Base64

Encode and decode without line wrapping — matching Android’s NO_WRAP, and tolerating input that has wrapping.

encode androidkeystoreencoding
URL encode

Strict encoding for a value inside a query string, whole-URI encoding for an entire link. They are not the same thing.

encode androiddeeplinkencoding
JSON format

Pretty-print or minify JSON, with the error location when it’s malformed.

encode jsonapiformatting
Handwriting

Draw with the mouse and get a clean SVG out. Stroke width follows your speed, so it reads as ink rather than a cursor trail.

draw svgsignaturedrawing
Undertow

A generative flow field. Thousands of particles trace a living current — move your cursor to disturb it, click to send a shockwave.

visual canvasgenerativenoise
DJ visualizer

Drop in an audio file and watch a turntable spin at the tempo of the track, with a 64-band spectrum ring and a live waveform.

visual canvasaudioweb-audio
Wire simulation

A rope held by one end, falling under Verlet integration. Drag the tail and it pulls back.

visual canvasphysicsverlet