Screen Recorder

Record a tutorial, a bug report, a slide presentation or an online meeting without installing anything. The recorder uses the screen-capture and recording features built into your browser: you choose exactly what to share, the video is assembled on your device, and the finished file is offered for download — nothing is uploaded. It works in desktop Chrome, Edge, Firefox and Safari; phones and tablets do not let web pages capture the screen.

How to use this tool

1. Tick the sound sources you want: the tab or system sound and, if you will narrate, your microphone.
2. Choose the frame rate and, if you like, a bitrate and a time limit.
3. Press Calculate. The browser asks what to share: a whole screen, one window or one tab.
4. Do what you want to record, then press Stop recording (or the browser's "Stop sharing" bar).
5. Preview the video 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). Screen content with lots of still text compresses well, so real files are often smaller than the formula suggests.

Example

A 10-minute tutorial at 4 Mbps with 128 kbps sound: (4,000 + 128) kbps × 600 s ÷ 8 = 309,600 kB, about 310 MB. At 1.5 Mbps the same recording would be about 122 MB.

MP4 or WebM?

Recent Chrome and Edge versions and Safari can record MP4 (H.264), which every editor and phone accepts. Firefox and older Chrome versions record WebM; the recorder writes the length into the WebM file so players can seek in it. If you need MP4 from a WebM recording, convert it with the WebM to MP4 converter.