Convert a VP9 / AV1 WEBM file into an MP4 with H.264 video and AAC audio so it plays in QuickTime, on iPhone, in PowerPoint, and inside every video editor that cannot read WEBM. The visual quality stays the same; only the codec and container change.
WEBM is an open, royalty-free video container built around the VP9 codec (or AV1) and Opus audio. It is the default format YouTube serves to modern browsers because it compresses smaller than MP4 at the same quality. The trade-off: Apple’s ecosystem and many older players still refuse to open WEBM files.
MP4 (MPEG-4 Part 14) is the most widely supported video container on the planet. It packs H.264 or H.265 video with AAC audio into a single file that plays natively on iPhone, Android, Windows, macOS, web browsers, smart TVs, and every modern editor. Use MP4 when you need a finished, shareable video that will just work, anywhere, without re-encoding.
Server-side ffmpeg + yt-dlp on auto-scaling workers. Most files finish in seconds, not minutes.
Every uploaded or fetched file is virus-scanned before it ever reaches your download.
Files live on encrypted S3 storage for 2 hours, then are permanently purged. We never log file contents.
Free for up to 10 conversions per hour with no account. Pro unlocks larger files and priority queue.
Drop a WEBM file from your device, or paste a public URL pointing to the WEBM you want to convert.
The output is pre-set to MP4. You can adjust quality or bitrate in the advanced options if you need a smaller file.
Click Convert. Our cloud workers fetch the WEBM, scan it for malware, and run the WEBM → MP4 pipeline.
A one-time pre-signed link appears as soon as the MP4 is ready. The file is automatically deleted from our storage 2 hours later.
Browse other popular file conversions handled by the same pipeline.