Convert WebM videos to MP4 format instantly. Free online converter for YouTube downloads, screen recordings & web videos.
Conversion settings — add a file to adjust
Upload your .webm file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mp4 file when it's ready.
WebM is the web's native video format, optimized for HTML5 browsers and streaming efficiency. However, when you download WebM videos or create screen recordings, you often need to convert to MP4 for editing, sharing, or playback on devices that don't support WebM natively.
Our WebM to MP4 converter handles both VP8 and VP9 encoded videos, transforming them into universally compatible MP4 files. Whether you're working with YouTube downloads, browser-based screen recordings, or web-optimized video content, the conversion preserves quality while enabling playback anywhere.
WebM excels at web delivery but stumbles elsewhere. iOS devices don't play WebM. Most video editors can't import it directly. Presentation software rejects it. Even some Android phones struggle with VP9-encoded WebM files. Converting to MP4 removes all these barriers.
The conversion is especially valuable for content creators. Screen recordings made with browser-based tools often output WebM. YouTube downloads frequently come as WebM. Converting to MP4 enables editing in professional software, uploading to additional platforms, and sharing with clients who expect industry-standard formats.
MP4 also integrates better with other tools. Thumbnail generators, video compressors, format analyzers, and metadata editors all handle MP4 reliably. Your workflow becomes smoother when everything speaks the same format.
WebM uses VP8 or VP9 video codecs with Vorbis or Opus audio. Our converter transcodes these to H.264 video with AAC audio for maximum MP4 compatibility. We use high-quality x264 encoding with CRF 20 as the default, producing files that look identical to the WebM source.
For VP9-encoded WebM (common in recent YouTube downloads), the conversion may take slightly longer due to the computational demands of decoding VP9. The quality remains excellent regardless of the source codec.
WebM to MP4 requires transcoding since the formats use different codecs. Our encoder produces MP4 files that are visually indistinguishable from the WebM source. For maximum quality, select "High Quality" mode which uses CRF 18 and slower encoding presets.
| Device | WebM | MP4 |
|---|---|---|
| iPhone/iPad | No | Native |
| Android | Native | Native |
| Windows PC | Partial | Native |
| Mac | Partial | Native |
| Smart TV | Partial | Native |
| Web Browser | Native |
| Speed | ~2 seconds for a 10-second clip (VP9→H.264 is a real re-encode). |
| Output size | Can grow versus VP9, which compresses more aggressively — the trade is universal device playback. |
| Quality | Re-encoded to H.264/AAC at a visually-lossless default. |
| Engine | FFmpeg (libx264), server-side. |
Measured on our servers, June 2026, on a 10-second VP9 clip.
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 High Profile, AAC audio
Resolution: 1080x1920
Bitrate: 3.5 Mbps
Vertical 9:16, max 90 seconds
Resolution: 960x540
Bitrate: 1-2 Mbps
Max 16MB, keep under 3 minutes
Resolution: 1080x1920
Bitrate: 4-6 Mbps
Vertical, max 10 minutes
Resolution: 1920x1080
Bitrate: 5-8 Mbps
Max 512MB, max 2:20 minutes
Resolution: 1280x720
Bitrate: 2-4 Mbps
Free your WebM videos from browser-only playback. Our converter transforms web-native video into universally compatible MP4, enabling editing, sharing, and playback on any device. Fast processing, excellent quality, no watermarks.
Bezpečný přenos
Šifrované nahrávání přes HTTPS
Ochrana soukromí
Soubory automaticky smazány po zpracování
Bez registrace
Začněte převádět okamžitě
Funguje všude
| Native |
Max 25MB free, 100MB Nitro
Jakýkoli prohlížeč, jakékoli zařízení
| Vlastnost | WebM | MP4 |
|---|---|---|
| Celý název | WebM Video | MPEG-4 Part 14 |
| Přípona | .webm | .mp4 |
| Nejlepší pro | Web optimized | Universal compatibility |