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ConvertBox

Screen Recorder

Record your screen, tab, or webcam directly in the browser. Save as WebM or convert to MP4, capture audio, no installation or signup required.

How to Use

  1. Select whether to include microphone audio
  2. Click "Start Recording" and select the window/screen to record
  3. Record your content (you can pause/resume)
  4. Click "Stop Recording" to finish
  5. Preview and download the recorded video

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

Yes, when you start recording, you can choose to record the entire screen, a specific application window, or a browser tab.
You can optionally include microphone audio. System audio recording depends on browser support.
Recordings are saved in WebM format, which is widely supported.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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