Convert WEBM to MP4, Free
Upload your WEBM file and get a MP4 in seconds. No account, no watermark.
How to convert WEBM to MP4
WebM is an open-standard video format created by Google, used natively in Chrome browser screen recordings, HTML5 video on websites, and exports from tools like Loom and OBS. WebM uses VP8 or VP9 video with Vorbis or Opus audio. While it plays in any modern browser, many devices, smart TVs, and desktop media players do not support WebM natively.
Converting WebM to MP4 re-encodes the video to H.264 and the audio to AAC, producing a file that plays on any device. BoltConverter handles this conversion on our servers. After conversion, both files are deleted from the server immediately.
Upload your WebM file
Click the upload area or drag your .webm file onto the page. Files from browser screen recordings, Loom, or OBS are fully supported.
Video is re-encoded to H.264 MP4
BoltConverter decodes the VP8 or VP9 video and re-encodes it as H.264 in an MP4 container on our servers.
Download the MP4
Click Download to save the compatible MP4 file for playback on any device or platform.
Frequently asked questions
Why does my WebM file not play on my iPhone or smart TV?
Apple devices and many smart TVs do not include WebM/VP9 decoders. H.264 in an MP4 container is universally supported across all Apple and most smart TV platforms.
Will there be quality loss when converting WebM to MP4?
Yes, there is a small quality reduction because this is a transcode between two lossy codecs (VP9 to H.264). BoltConverter uses a high-quality encoding preset to minimize any visible degradation.
Does this work for Chrome browser screen recordings?
Yes. Chrome saves screen recordings as WebM files. BoltConverter converts them to MP4 correctly.
Is there a file size limit?
WebM files up to 500 MB are supported. For longer recordings, consider splitting them first.
Are my files stored after conversion?
No. Both the uploaded WebM and the converted MP4 are deleted from our servers immediately after you download the result.