Add your WebM
Choose up to three browser recordings or WebM videos.
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Private by design
Convert WebM to MP4
Upload one or more WebM videos and convert them into MP4 files on your device. Choose the output quality, resolution and audio settings before converting.
Free to useMaximum file size: 500 MBUp to 3 files at once
WebM → MP4
Convert your videos
● On-device
Drop your WebM here
or from your device
Up to 3 files at once · 500 MB eachReady to convert
Your videos
Preparing your private converter…
Your files stay privateProcessed on your device
500 MB per videoThree files at a time
Made for compatibilityH.264 video · AAC audio
No watermarkYour video stays yours
01 — HOW IT WORKS
From odd format to ready-to-share.
No upload queue and no confusing export panel.
Choose the balance
Keep full detail or make a smaller copy for sharing.
↓
Download the MP4
Preview and save a clean H.264 MP4 with no watermark.
02 — WHY MP4
Fewer playback surprises.
MP4 with H.264 video and AAC audio is broadly accepted by presentation tools, editors, messaging apps and social platforms.
WEBM→MP4
03 — GOOD TO KNOW
WebM questions, answered.
Where is my video processed?+
Inside this browser tab on your device. SmallWebLab Tools does not upload or retain the file.
Will the output look exactly the same?+
Conversion re-encodes the video. High preserves the most detail, Balanced is the practical default, and Small file applies more compression.
Is there a size or duration limit?+
Each file can be up to 500 MB. There is no fixed duration limit, but longer and higher-resolution files require more memory and time.
Does SmallWebLab Tools add a watermark?+
No. The downloaded MP4 contains only your converted media.