How to convert WebM to MP4
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
- 2
Convert WebM to MP4
NexMedia converts WebM to MP4 on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About WebM
WebM is an open, royalty-free video format developed by Google and based on the Matroska container. It holds VP8, VP9 or AV1 video with Vorbis or Opus audio.
It is made for the web: all major browsers play it in the HTML video element, and it is common for screen recordings and short clips.
WebM allows only its own small set of codecs, so H.264 video or AAC audio has to be re-encoded to fit.
Convert WebM to MP4 online free, no account required — MP4 is a widely supported video container, usually holding H.264 video and AAC audio.
Change WebM to MP4 without losing quality — convert WebM to MP4 free in your browser.
Why can't I upload my WebM video to Instagram or TikTok? Social apps almost always demand MP4, so a WebM made for the web needs converting before it will upload.
About MP4
MP4 (MPEG-4 Part 14) is a container format standardised by ISO. It usually holds H.264 or H.265 video with AAC audio, and it can also carry subtitles and chapter markers.
It is the most widely supported video format: phones, browsers, smart TVs and video sites all play it.
The video inside an MP4 is almost always compressed with a lossy codec, so every re-encode loses a little quality.
Why convert video to MP4? Almost every device, browser and platform plays it, so an MP4 almost never needs a second conversion.
What changes when you convert WebM to MP4
- The WebM is re-encoded into MP4 at the default quality settings, so the result looks close to the original but is not bit-identical.
Settings you can change
Before you convert WebM to MP4, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted MP4 file is kept for 2 hours, then deleted.
WebM to MP4: questions and answers
Does converting WebM to MP4 reduce quality?
The WebM is re-encoded into MP4 at the default quality settings, so the result looks close to the original but is not bit-identical.
What is the difference between WebM and MP4?
WebM is an open, royalty-free web video format with VP8, VP9 or AV1 video and Opus or Vorbis audio. MP4 is a widely supported video container, usually holding H.264 video and AAC audio.
Can I change the settings when converting WebM to MP4?
Before you convert WebM to MP4, you can adjust: Video codec, Rate control, Quality (CRF), Video bitrate, Resolution, Width, Height, Scale fit, Frame rate, Encoder preset, Audio codec, Audio bitrate, Trim start, Trim duration, and Remove metadata.
Do I need an account to convert WebM to MP4?
No. You can convert WebM to MP4 without an account; signing in raises the file-size and daily limits.
How long is my converted MP4 file kept?
The MP4 file you convert from WebM is kept for 2 hours, then deleted automatically.
When I convert WebM to MP4, is the video re-encoded?
The WebM is re-encoded into MP4 at the default quality settings, so the result looks close to the original but is not bit-identical.
Will converting WebM to MP4 change my original file?
No. The conversion reads your WebM and writes a new MP4 file, leaving your original WebM file untouched.