How to convert WEBM to MP4
- Add your .WEBM file - drop it in the box above or click to browse.
- Convert it to .MP4 in a few seconds.
- Download your new .MP4 file.
What to expect
- WebM video (VP8/VP9/AV1) cannot be placed directly into an MP4 container - the video is always re-encoded, so some quality is lost.
- Audio must also be re-encoded from Vorbis or Opus to AAC; skipping this step can result in no audio on phones and TVs.
- AV1-encoded WebM files (common in recent YouTube downloads) take noticeably longer to decode than VP9 files.
Frequently asked questions
Does converting WebM to MP4 reduce quality?
Yes, always. The video must be re-encoded from VP8/VP9/AV1 to H.264, which is a lossy process - at typical default settings the difference is small but measurable.
Can I just rename the file from .webm to .mp4?
No. Renaming does not change the container or the codec inside, so the file will be unplayable or cause errors on most devices.
How long does conversion take?
It depends on file length, resolution, and CPU speed - a 1-minute 1080p VP9 WebM typically takes 1-3 minutes on a modern desktop using FFmpeg.
What video codec does the MP4 output use?
Most tools default to H.264 (libx264), which offers the widest device compatibility. HandBrake and FFmpeg can also output H.265 for smaller files at the cost of slower encoding.
Programs that convert WEBM: Miro Video Converter · Free Studio · Freemake Video Converter · MediaCoder · SUPER · Miro Video Converter for Mac
