TeraConvertTeraConvert

Convert WebM to MP4 on your Mac

macOS and QuickTime won't open WebM. Convert WebM to MP4 on your Mac so it plays everywhere, with nothing uploaded. The desktop app batches entire folders.

Conversion Successful
100% local. Your file is processed in this tab and never uploaded.

How to Convert WEBM to MP4

  1. 1

    Drop your WEBM file

    Drag it into the converter above, or click to browse. Nothing is uploaded.

  2. 2

    Adjust settings (optional)

    Trim, crop, resize, mute, or set quality from the sliders icon.

  3. 3

    Convert and download

    MP4 is preselected. The file converts in this tab and downloads when done.

Why Convert WEBM to MP4?

WebM plays beautifully in a browser tab and almost nowhere else; editing software, upload forms, and native players routinely refuse it, which is a strange fate for a perfectly good screen recording. MP4 ends the argument.

Every tool takes it.

WEBM
MP4
Container
WebM
Container
MP4 (ISOBMFF)
Typical codec
VP8 / VP9 / AV1
Typical codec
H.264 / H.265
Audio codec
Opus / Vorbis
Audio codec
AAC
Streaming friendly
Yes
Streaming friendly
Yes
Device support
Browsers, limited elsewhere
Device support
Universal
Typical use
Web video
Typical use
Web, mobile, TV

Related Conversions

Frequently Asked Questions

What codec does WebM use?
WebM uses VP8 or VP9 video with Vorbis or Opus audio. These codecs are open-source and royalty-free but not widely supported outside browsers.
Will the VP8/VP9 video be re-encoded to H.264?
Yes. Converting WebM to MP4 re-encodes the video stream from VP8/VP9 to H.264 and the audio from Opus/Vorbis to AAC for maximum compatibility.
Will the converted MP4 have worse quality than the WebM?
At the default High quality setting, visual differences are minimal. VP9 is generally more efficient than H.264, so the MP4 may be slightly larger at equivalent quality.
Can I convert WebM files larger than 500 MB in the browser?
The browser converter supports files up to 500 MB. TeraConvert Desktop removes this limit and processes WebM files of any size.
Is my file private?
Yes. The conversion runs in your browser tab and nothing is uploaded, so your files never leave your device. The only limit is size: 500 MB for this format. Bigger files route to the desktop app.

Batch-converting screen recording WebM files?

TeraConvert Desktop converts a whole batch of WebM recordings to MP4 through native FFmpeg with no size cap.

Get TeraConvert for MacThis format runs in the Mac app. One-time Pro purchase, 14-day money-back guarantee.