Free Online WebM Compressor
Reduce the size of WebM videos for free, directly in your browser. Choose a preset, check the estimated file size, and download the compressed version as an MP4.
Over 1 million creators use Flixier every day including brands like:
How to Compress WebM Online
Make WebM Files Smaller in Your Browser
Choose a File Size
Choose a preset based on where you plan to upload or send the video. Flixier includes options for Discord, WhatsApp, and email, plus a Balanced preset for general compression. Each option shows an estimated file size before you compress.
Remove Unneeded Audio
If your video doesn’t need sound, select Remove audio before compressing it. This leaves the audio track out of the downloaded MP4 and can reduce the file size further, which is useful for silent demonstrations, screen recordings, and videos made to play without sound.
Check Before Downloading
Use the before-and-after preview to compare the compressed video with the original. Flixier also shows the original and compressed file sizes, duration, and dimensions, so you can check the result before downloading the MP4.
Compress Without Uploading
The compression runs directly on your device, so your WebM is not uploaded to Flixier's servers. There's no upload to wait for, no file size limit imposed by the tool, and no app to install. You can also compress MP4, MOV, or MKV files.
Everything you need to create
and finish AI videos
Who This Is For
Marketers
Make product clips and campaign files smaller before sending them for review, attaching them to an email, or uploading them online.
See How It WorksEducators
Business Owners
Social Creators
Still have questions?
We got you!
How do I compress a WebM file for free?
Add your WebM to Flixier and choose the Balanced, Discord, WhatsApp, or Email preset. Check the estimated output size, decide whether to remove the audio, and click Compress video. Compare the result with the original, then download the compressed MP4 to your device.
Can I compress VP9 WebM videos?
Yes. Our online tool fully supports both VP8 and VP9 WebM video types. You can drop these files into your browser window to lower their file size instantly without experiencing any format errors or compatibility issues.
Can I remove the audio while compressing my WebM?
Yes, you can select Remove audio before clicking Compress video. Flixier will leave the audio track out of the compressed MP4, which can make the downloaded file smaller. This is useful when the video shows a visual process but does not require speech, music, or other sound.
Does my WebM get uploaded to a server?
No, Flixier processes the WebM locally using your device, so the file does not need to be uploaded to its servers. This removes the initial upload wait and keeps the source video on your computer during compression. You only download the new MP4 once it is ready.
What format will my compressed video use?
Flixier downloads the compressed version as an MP4, regardless of the WebM source file. The results screen shows its final file size, duration, and dimensions before you download it. You can also compare the compressed version with the original video or continue working on it in the editor.
