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Browser Video to WebM

Re-record a short supported local MP4, MOV-family or WebM clip as a bounded WebM video.

Files stay on your device No sign-up Free to use
How this works

The tool runs in this browser. Your file or text is not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

Privacy details

Drop your file here

or choose one from your device

One browser-decodable MP4/MOV-family or WebM video. Up to 256 MiB, 60 minutes, 8.3 megapixels, one video track and at most one audio track. The full clip must be no more than 10 minutes. Output is re-recorded WebM, with a maximum 1080p pixel count.

    How to use Browser Video to WebM

    1. Choose one local video whose full duration is comfortably below the 20-second output limit.
    2. Run the conversion with the page visible; the browser decodes and re-records the clip.
    3. Play the generated WebM and check its beginning, ending and any audio before downloading.

    Example: Browser Video to WebM

    Prepare a short clip for a player that accepts WebM.

    You add
    Source: a two-second, 640 × 360 browser-decodable video with one video track and no audio. No conversion settings are required.
    You get
    The download is WebM with 640 × 360 video and zero audio tracks. The report gives its measured recording duration; it need not be exactly 2.000 seconds.

    Supported inputs and limits

    Re-records decoded frames and supported sound into WebM. Use a browser-decodable MP4/MOV-family or WebM with one video track and at most one audio track. Total selected input: 256 MiB; source frames: 8,294,400 pixels (4K). Sources may be up to 60 minutes, but whole-clip jobs require a clip of 10 minutes or less. Selected or combined output: up to 10 minutes and 128 MiB, 2,073,600 pixels (1080p) and 1,920 pixels per side. Recording runs in real time and the page must stay visible. WebM export re-encodes the media, so quality, frame timing and sound timing depend on the browser and device. Metadata, subtitles and extra tracks are not preserved. Seek cues are not built; check playback before using the file. Larger jobs need more device memory.

    Where your input is processed

    This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

    Conversion depends on the browser decoder

    The accepted filename extensions identify possible containers, not a promise that every codec inside them can play. A supported MP4 may decode while another MP4 with an unsupported codec fails. A file that cannot be decoded or whose track layout falls outside the limits is refused instead of producing a silent or empty substitute.

    Re-recording changes the file

    This tool plays the decoded frames into the browser encoder. It does not copy the original compressed stream, preserve all metadata or create an MP4 download. Check the measured duration and sound because playback delays can affect the result. Keep the tab visible and leave room below the maximum duration for those delays.

    Questions about Browser Video to WebM

    Which output containers are offered?

    WebM only. MP4 and MOV output encoders are not included.

    Will conversion preserve subtitles or metadata?

    No. The new recording does not carry the original container’s extra tracks or metadata.

    How long does a conversion take?

    Recording runs approximately in real time; keep the page active until it finishes.

    Project manager: Tony Hines · Content updated 4 October 2026 · Report a problem

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