Free tools
Updated 2 October 2026
Small tools that answer the questions people have right before they record. Each one runs in your browser and uploads nothing.
Webcam test
Check your webcam works before a recording or a call. See the picture, the resolution and the real frame rate. Runs in your browser; nothing is uploaded.
Microphone test
Check your microphone before you record. See the level move as you speak, then record five seconds and hear yourself back. Nothing is uploaded.
What is my screen resolution?
See your screen resolution, its true pixel size, your pixel ratio and window size, and the best resolution to record at. Instant, in your browser.
Video aspect ratio calculator
Work out a video's aspect ratio, or the height for any width at 16:9, 9:16, 1:1, 4:5 or 4:3. Instant and free.