How to use the WEBM to MP4 converter
- Choose your WEBM video or drop it on the box.
- Check the settings. "Same as original" resolution is fastest and lets fast mode copy compatible videos without re-encoding. Lower it to 720p for a smaller file.
- Click "Convert to MP4". A progress meter shows how far along it is.
- Download your MP4.
Why convert WEBM to MP4?
WebM files from browser recorders and download tools often will not open in Premiere, iMovie, PowerPoint or on older iPhones. MP4 is accepted by all of them.
- WEBM: many editing apps and older Apple devices cannot open it.
- MP4: plays almost everywhere.
- MP4: good quality at small sizes with H.264.
VP9 video has to be re-encoded to H.264, so this takes longer than a simple copy. Choose "Balanced" quality for a good result at a normal size.
WEBM vs MP4
| WEBM | MP4 | |
|---|---|---|
| Full name | WebM | MPEG-4 Part 14 |
| Type | Video | Video |
| Created by | Google (2010) | Moving Picture Experts Group (MPEG) (2001) |
| Compression | Lossy | Lossy |
| Typical codecs | VP9 or VP8 (sometimes AV1) + Opus or Vorbis | H.264 + AAC |
| Best for | Web video, browser screen recordings and HTML5 players | Sharing videos online, phone recordings, social media uploads and streaming |
| Plays on | Chrome, Firefox, Edge, Android and VLC; support in older iPhones, PowerPoint and many editors is limited | Windows, macOS, iPhone, Android, smart TVs, game consoles and every modern browser |
Does converting WEBM to MP4 lose quality?
WEBM (VP9 or VP8 (sometimes AV1)) has to be re-encoded to MP4 (H.264). At "Balanced" quality the difference is very hard to see; choose "High" for footage you will edit again.
How long does it take?
Re-encoding video uses your device's processor. A short clip takes seconds; a 10-minute 1080p video can take several minutes. Choosing 720p makes it 2–3 times faster.
What is a WEBM file?
WebM is an open, royalty-free video format made by Google for the web. It is based on Matroska and uses VP8, VP9 or AV1 video with Opus or Vorbis audio. Browsers play it natively, and many screen recorders and download tools produce WebM files.
What is an MP4 file?
MP4 is a container that usually holds H.264 or H.265 video with AAC sound. It is built on Apple's QuickTime file structure and became an ISO standard in 2001. Because almost every phone, browser, TV and editing app can play it, MP4 is the safest choice when you need a video to just work.
Frequently asked questions
Do I have to pay or sign up to use the WEBM to MP4 converter?
No. There is no account, no payment and no watermark. The only limit is 1 GB per file, set by what browsers can handle.
Do you keep a copy of my files?
We never receive them. All processing happens on your device, so there is nothing for us to store or delete.
Will the MP4 sound and look as good as the WEBM?
WEBM (VP9 or VP8 (sometimes AV1)) has to be re-encoded to MP4 (H.264). At "Balanced" quality the difference is very hard to see; choose "High" for footage you will edit again.
Can I convert MP4 back to WEBM?
Yes, use the MP4 to WEBM converter.
A WEBM will not import into Premiere, iMovie or PowerPoint. What should I do?
Convert it to MP4 (H.264), which every editor accepts.
Can I use it on my phone?
Yes. Open the page in your phone's browser and choose a file. Phones have less memory than computers, so very large files are better converted on a laptop or desktop.