WEBM to MP4
Converter
Convert WEBM videos to MP4 online — free, no signup. Save browser recordings and screen captures in a format that plays everywhere.
Convert WEBM to MP4 free →No account needed · Up to 25 MB free · Files permanently deleted after 1 hour
How it works
Common questions
Why does my screen recording save as WEBM?
Most browsers use the MediaRecorder API to capture screen or camera recordings, and the default output format is WEBM — specifically VP8 or VP9 video with Opus audio. WEBM is royalty-free and well-supported by browsers, but it isn't natively supported by many operating systems, video editors, or video platforms outside the browser context.
Does converting WEBM to MP4 reduce quality?
In most cases, Formatly re-encodes WEBM to H.264 at a high bitrate — you may notice a slight quality difference only if your original WEBM was very high quality (4K or high frame rate). For typical screen recordings (1080p, 30fps), the output MP4 is visually indistinguishable from the source.
Will the audio from my WEBM be preserved?
Yes — Opus audio from WEBM is transcoded to AAC in the MP4 output. The audio quality is preserved at a high bitrate. If your WEBM was recorded without a microphone or system audio, the MP4 will likewise have no audio track.
Is there a file size limit?
Free users can convert WEBM files up to 25 MB without an account, or up to 10 conversions per day with a free account. Pro users get 500 MB per file and 3,000 credits a month. Business users get up to 5 GB.