Why is the first run slower?

This tool needs a processing engine that is downloaded once and then cached: ffmpeg.wasm: about 30 MB, fetched once from the jsDelivr CDN and cached by your browser. Only the engine is downloaded. Your file never leaves your device.

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Video / Screen Recorder

Screen Recorder

Record screen + webcam bubble with mic and system audio.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Screen Recorder works

Screen Recorder captures a screen, window or tab with getDisplayMedia, optionally composites your webcam as a bubble on a canvas, mixes microphone and system audio with Web Audio, and records with MediaRecorder. The recording stays in your browser until you save it.

Input: MP4, WEBM, MOV, MKV, AVI.

How to use Screen Recorder

Drop a video onto Screen Recorder.
The first run downloads the ffmpeg engine (about 30 MB, once).
Set your range, format or quality options.
Process it (progress is shown live), then download.

Tips

System audio capture is available for tabs and on some platforms only (best on Chromium).
Screen capture is not available on most mobile browsers.

Screen Recorder FAQ

Why is the first run slower?: This tool needs a processing engine that is downloaded once and then cached: ffmpeg.wasm: about 30 MB, fetched once from the jsDelivr CDN and cached by your browser. Only the engine is downloaded. Your file never leaves your device.
Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Related tools

Webcam Recorder: Record webcam video with mirror and countdown.
Video Trimmer: Trim and cut clips with a visual timeline, no re-upload.
Video Compressor: Compress videos with quality presets and target resolution.
Crop Video: Crop a video visually with aspect presets for Reels, Shorts and TikTok (9:16), square (1:1) and portrait (4:5).