About these tools
Free browser tools to test your microphone, webcam, keyboard and display, tune an instrument and keep time. Nothing is uploaded.
Processed in your browser
Graphite builds tools that work without an account. File conversion, calculations and games run in your browser rather than an input-processing server.
Design and operation
The sites are served as static assets on Cloudflare and are configured to support operation through advertising. Advertising and request data are described in the privacy policy.
Check your result
Supported formats and features vary by device and browser. Keep originals and inspect converted or generated results before using them.
Creator and contact
Graphite provides creator information and public contact links on its about page.
Available tools
- Mic Test — Check that your microphone works, read its level in dBFS and hear a 5 second recording.
- Webcam Test — Preview your camera, check its real resolution and frame rate, and save a snapshot.
- Keyboard Test — Press every key to see it light up, read its key code and check for dead keys or ghosting.
- Dead Pixel Test — Fill the screen with solid colors to find dead, stuck and hot pixels.
- Tuner — Tune any instrument with your microphone, with presets for guitar, bass and ukulele.
- Metronome — Keep steady time from 20 to 300 BPM with accents, subdivisions and tap tempo.
- Mouse Button Test — Check left, middle, right, double-click and wheel events in one pad.
- Stereo Speaker Test — Play a short test tone through the left, right or both channels.
- Display and Viewport Information — Read your browser viewport, screen dimensions, pixel ratio and current orientation.
- Browser Feature Checker — Check whether browser APIs for media, storage, canvas and file handling are available.