Webcam Recorder

Record yourself for a video message, a class assignment, an interview answer or a quick product demo without installing anything. The recorder uses the camera and microphone through your browser: you see a live preview, a countdown gives you time to get ready, and the finished video is assembled on your device and offered for download. Nothing is uploaded. It works in current Chrome, Edge, Firefox and Safari on computers and phones.

How to use this tool

1. Choose the resolution, the microphone, the camera (front or back on phones) and the countdown.
2. Press Calculate and allow camera and microphone access when the browser asks.
3. After the countdown, record; press Stop recording when you are done (or let the time limit stop it).
4. Play the video in the page and download it.

Formula

File size ≈ (video bitrate + audio bitrate) × length ÷ 8

With "Browser default" the browser picks the bitrate itself (Chrome uses about 2.5 Mbps). The resolution is a request: the camera answers with the closest size it supports, which the result reports. Recent Chrome, Edge and Safari versions record MP4 (H.264 + AAC); otherwise the file is WebM, and the recorder writes its length into the file so players can seek.

Example

A 3-minute answer at 4 Mbps with 128 kbps sound: (4,000 + 128) × 180 ÷ 8 = 92,880 kB, about 93 MB. At 1.5 Mbps it would be about 37 MB.