Convert Shockwave Flash (.swf) to WebM Video (.webm) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .swf 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.
SWF (Shockwave Flash) is Adobe's discontinued multimedia format. WebM is Google's open, royalty-free video format designed for the web, using VP8/VP9 video codecs and Vorbis/Opus audio codecs in a Matroska-based container. Converting SWF to WebM transforms legacy Flash content into the modern open web video standard supported by Chrome, Firefox, Edge, and Opera, as well as Android devices.
WebM was explicitly designed as a web-first video format — lightweight, efficient, and free of patent licensing fees. For Flash content that will be published on the web, embedded in HTML5 pages, or served from CDNs, WebM provides an excellent modern replacement that aligns with the open web principles that ultimately replaced Flash.
WebM is the open-source alternative to MP4 for web video. Chrome, Firefox, Edge, and Opera support WebM natively through the HTML5 video element. For websites and web applications that serve video and prefer open-source codecs, WebM is the standard format. Flash content converted to WebM can be embedded directly in web pages using the same HTML5 video element that replaced Flash Player.
VP9 (WebM's modern video codec) provides compression efficiency competitive with H.264, often achieving smaller file sizes at equivalent quality. For web delivery where bandwidth matters, WebM with VP9 can reduce video serving costs compared to H.264/MP4.
The conversion engine uses FFmpeg to decode the SWF content and re-encode using the VP9 video codec and Opus audio codec in a WebM container. VP9 encoding uses CRF 30 for a good quality-to-size ratio for web delivery. Opus audio at 128 kbps provides excellent quality. The WebM output is optimized for web streaming with cues (index) at the beginning of the file for fast seeking.
VP9 encoding provides excellent visual quality at efficient file sizes, competitive with H.264. The source SWF content quality is the limiting factor — VP9 faithfully encodes whatever is extracted from the Flash file. Opus audio provides superior quality compared to Vorbis and AAC at the same bitrate. The WebM output is well-suited for web delivery at various bandwidth levels.
| Device | SWF | 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
SWF to WebM conversion transforms Flash content into the modern open web video standard, ready for HTML5 embedding, CDN delivery, and royalty-free web publication.
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Hoạt động mọi nơi
| Native |
8MB free, 50MB Nitro
Mọi trình duyệt, mọi thiết bị
| Tính năng | SWF | WebM |
|---|---|---|
| Tên đầy đủ | Shockwave Flash | WebM Video |
| Phần mở rộng | .swf | .webm |
| Phù hợp nhất cho | Flash format | Web optimized |