ByteScope

Screen Recorder

Record your screen — free, no watermark, no install, nothing uploaded.

Your files never leave your browser — all processing is local.

Sources

0 sources

Each source opens the browser's own share picker — you choose exactly what is captured.

Audio

No audio sources yet — the recording will be silent.

Tab audio: tick "share tab audio" in the picker when capturing a tab (Chrome/Edge only).

System audio: choose "Entire screen" and tick "share system audio" (Chrome/Edge on Windows).

Layout

output 1280 × 720 px

▲ Layout editing is best on desktop — the preview is scaled down on small screens.

R start/stop · P pause/resume
format …storage OPFS if available (probed at start)sources 0

Add at least one source first.

Browser support

What each browser can honestly do — the gaps are the platform's, not the tool's.

featureChromeEdgeFirefoxSafari
Screen / window / tab captureSafari: screen/window only, desktop only, and macOS asks for its own screen-recording permission.✓✓✓◐
Tab audioTick "share tab audio" in the Chrome/Edge picker when capturing a tab.✓✓✗✗
System audioWindows only, when sharing the entire screen. macOS exposes no system audio to ANY browser.◐◐✗✗
Webcam overlay✓✓✓✓
Native MP4 outputChrome 126+/Edge/Safari record MP4 directly; Firefox records WebM (convert afterwards).✓✓✗✓
Hour-long recordings (OPFS streaming)Chunks stream to origin-private storage; without it the recording is held in memory.✓✓✓✓
Region recording (crop)Done in the compositor — draw a crop box on any capture; works wherever capture works.✓✓✓✓
Click highlightOnly theoretically possible when recording this very tab (mouse events are invisible elsewhere) — not implemented yet.✗✗✗✗

Detected in this browser:

  • screen capture …
  • MediaRecorder …
  • MP4 recording …
  • OPFS streaming …

The mouse cursor is baked into screen/window captures by the OS and browser — whether it appears (and in window captures, whether at all) is not under this tool's control.

About this tool

Record the whole screen, a single window or a browser tab — the browser shows its own picker, so you choose exactly what's shared and nothing is captured without your say-so (a trust property, not a limitation). Add a webcam overlay as a draggable, resizable, optionally circular picture-in-picture, and mix up to three audio sources — microphone, tab audio, and (on Chrome + Windows) system audio — each with its own level control. Everything is captured and encoded in your browser and never uploaded.

Long recordings don't blow up memory: frames are written to OPFS storage in one-second segments as you record, so hour-long captures work — something most in-browser recorders can't do. When available the output is native MP4; otherwise it's WebM, with one click to convert it in our video tools. Multiple sources are composited on a canvas (side-by-side, picture-in-picture or a custom drag layout), and you can crop to any region by drawing a box on a full-screen capture.

It's built to be honest about platform limits — a support matrix spells out exactly what each browser can and can't do (Chrome and Edge get everything; Firefox and Safari have gaps, and macOS can't capture system audio), because a recorder you can trust is worth more than one that over-promises. Countdown start, pause and resume, live duration and file size, and a preview-and-download finish screen round it out.

Frequently asked questions

Is my recording uploaded to a server?
No. Screen, camera and audio are captured, composited and encoded entirely in your browser, and the file is streamed to local OPFS storage — there is no upload, which you can confirm in the DevTools Network tab. The recording only leaves your machine if you choose to download and share it.
Is there a watermark, time limit, or install?
None of the three. No watermark is ever added, there's no hard length limit (segmented OPFS writing keeps memory flat for hour-long recordings), and nothing is installed — it runs in the browser tab.
Can I record the whole screen and system audio?
Whole-screen video: yes, on all supporting browsers — you pick "entire screen" in the browser's share dialog. System audio (the sound your computer plays): only on Chrome/Edge on Windows, where the share dialog offers "share system audio". macOS doesn't expose system audio to browsers — the support matrix flags this, and you can still record microphone and tab audio there.
Can I record multiple windows or add my webcam?
Yes. Add several capture sources (each needs its own browser permission click) and arrange them side-by-side, as picture-in-picture, or in a custom layout on the compositing canvas; a webcam overlay can be positioned, resized and circle-cropped. CPU cost rises with each source, so 3 or fewer is recommended.
Why is my recording a WebM instead of MP4?
Not every browser can encode MP4 in-browser yet. When native MP4 recording is available you get MP4; otherwise the tool records WebM (same quality) and offers one-click handoff to our video converter to turn it into MP4 if you need it.