Convert a WebM File to MP4
WebM to MP4 converter takes a web-optimized WebM file (a screen recording, a browser download, a video pulled off a site) and gives it back as an MP4 you can play, edit, or upload anywhere. Upload the file and download the converted copy, no software or account setup beyond signing in.
What you get:
- A WebM file converted to MP4, original resolution and framerate kept
- Files up to 2 GB in the free online tool on this page, with no set file size limit in the app
- bulk upload of multiple files, so several WebM files convert in one batch
- A transcript of the audio, with speaker labels, in 100+ languages
- AI chat with any recording, so you can ask the converted video a question instead of watching it back
- Export the transcript as PDF, DOCX, TXT, SRT and VTT
- Free plan: 3 uploads, lifetime, each with the transcript and AI chat included
How to Convert WebM to MP4
- Upload your WebM file: from a computer, phone, or tablet. The free online tool on this page takes files up to 2 GB; the ScreenApp app has no set file size limit.
- Let it process: the file converts to MP4 and the audio transcribes at the same time. Both are ready in your library once processing finishes.
- Download the MP4: open the file and download it. The transcript, speaker labels, and AI chat are attached to the same recording.
The MP4 keeps the source file’s resolution and framerate. Transcript quality follows the audio: clear narration transcribes cleanly, and a recording with heavy background noise or several people talking over each other will have more gaps. See how we measure accuracy.
WebM to MP4 Converter vs Other Tools
| Feature | ScreenApp | CloudConvert | FreeConvert |
|---|---|---|---|
| Max file size, free | 2 GB (free online tool) | 1 GB | 1 GB |
| Free allowance | 3 uploads, lifetime | 10 credits/day | 20 minutes/day |
| Paid plan | $19/month annual | Not stated (credit packs, priced by volume) | $12.99/month |
Sources, checked 2026-09-12: ScreenApp pricing, cloudconvert.com/pricing, freeconvert.com/webm-to-mp4, freeconvert.com/pricing
- vs CloudConvert: CloudConvert gives free accounts 10 conversion credits and caps free files at 1 GB. ScreenApp’s free plan is 3 uploads with no daily reset, with no set file size limit, and adds a transcript.
- vs FreeConvert: FreeConvert’s free web tier is 20 conversion minutes a day, with paid plans starting at $12.99 a month for larger files. ScreenApp includes the transcript and AI chat on every converted file, free or paid.
Who Converts WebM to MP4
Screen recorder users end up with WebM files because that is the default output of many browser and screen recording tools. Converting to MP4 makes the recording play in a video editor or on a device that does not open WebM.
Web developers and content creators pull WebM video off a site or a build tool and need it in MP4 to edit in Premiere Pro or Final Cut Pro, both of which handle MP4 more reliably than WebM.
Social media managers convert a WebM export to MP4 before uploading to Instagram, LinkedIn, or a client’s hosting platform, most of which expect MP4.
Educators and students convert a lecture or tutorial that was recorded or downloaded as WebM so it plays on every laptop and phone in a class, not just the ones with a browser that supports WebM.
Business professionals convert a demo, training video, or presentation recording to MP4 before sending it to a client or colleague who cannot open WebM on their device.
