Convert RealMedia (.rm) to WebM Video (.webm) online for free. Fast, secure video conversion with no watermarks or registration.
Upload your .rm 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 .webm file when it's ready.
WebM is Google's open, royalty-free video format designed specifically for the web. It pairs VP8 or VP9 video codecs with Vorbis or Opus audio in a Matroska-based container. WebM is natively supported in Chrome, Firefox, Edge, and Opera, making it the open-source alternative to MP4 for HTML5 video delivery. RM (RealMedia) was developed by RealNetworks in 1997 as the first major internet streaming video format, using proprietary RealVideo codecs with constant bitrate encoding for dial-up connections.
Converting RM to WebM modernizes the earliest internet video content for today's web standards. Both formats were born for internet delivery — RM for the dial-up era, WebM for the broadband and mobile era — making this a natural generational upgrade.
RM was designed for the web but can no longer play on the web. No browser has supported RealPlayer plugins since the early 2010s, and RealVideo decoding was never built into HTML5. WebM, by contrast, is a first-class HTML5 video format — supported natively in Chrome (67% market share), Firefox, Edge, and Opera.
WebM with VP9 is also significantly more efficient than RealVideo. The same content can be delivered at higher quality and lower bandwidth. For anyone wanting to publish recovered RM content on the web — blogs, educational sites, digital archives — WebM is the open-source, patent-free web video format.
FFmpeg decodes RealVideo (RV10/RV20/RV30) and RealAudio (Cook) from the RM container. Video is re-encoded using VP9 (libvpx-vp9) at CRF 31, which produces quality that matches or exceeds the original RM at lower file size. Audio is encoded to Opus at 96 kbps (sufficient given the low-quality RM audio source). WebM's Matroska-based container writes cues at the beginning for instant seeking in browsers. Two-pass encoding can be used for optimal bit allocation.
VP9 at CRF 31 is roughly twice as efficient as RealVideo — the WebM output looks as good as or better than the RM source at 40-60% of the file size. However, the RM source content is inherently poor quality: low resolution (176x144 to 320x240), low frame rate (10-15 fps), and heavy dial-up era compression artifacts. VP9 cannot remove these artifacts; it simply preserves and wraps them more efficiently. The content is rescued, not enhanced.
| Device | RM | WebM |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
RM to WebM conversion is the ideal choice for web publishing of recovered RealMedia content. VP9's efficiency, Opus's quality, and native browser support make WebM the best open-source web video format for legacy RM archives.
Безпечна передача
Завантаження зашифровані через HTTPS
Конфіденційність передусім
Файли автоматично видаляються після обробки
Без реєстрації
Почніть конвертацію миттєво
Працює всюди
| Native |
8MB free, 50MB Nitro
Будь-який браузер, будь-який пристрій
| Характеристика | RM | WebM |
|---|---|---|
| Повна назва | RealMedia | WebM Video |
| Розширення | .rm | .webm |
| Найкраще для | Streaming format | Web optimized |