WMV to SWF Converter

How to Convert WMV to SWF Online

1. Upload Your WMV File: Drag and drop, or click "+ Add Files" to select one or more .wmv clips from your computer. Batch uploads are supported — each file converts independently with the same settings.
2. Pick a Quality Preset: The default is "Very High (Recommended)". Step down to High, Medium, or Low to shrink the output for slower drives or legacy hardware; pick Lowest only when file size matters more than fidelity. You can also switch File Compression mode to Constant Bitrate, Constant Quality, or Constraint Quality, or target a Specific file size when you need the SWF to fit a known cap.
3. Resolution and Trim (Optional): Under Video resolution, leave "Keep original" to preserve the WMV's native frame size, or pick a preset (e.g. 480p, 720p, 1080p) — older Flash projectors were tuned for 4:3 SD output, so down-scaling to 640x480 or 854x480 often plays back more cleanly. Use Width/Height with "Keep aspect ratio" for custom dimensions, or Resolution Percentage to scale by a ratio. The Trim section lets you set a start time and duration if you only need a clip rather than the full WMV.
4. Convert and Download: Click Convert. Files process on our servers over HTTPS — no sign-up, no watermark, no Microsoft Silverlight or DRM hand-off required for standard WMV input.

Why Convert WMV to SWF?

WMV (Windows Media Video) is a Microsoft container that wraps WMV1/WMV2/VC-1 video and WMA audio, designed in the early 2000s for Windows Media Player and ASF streaming. SWF (Small Web Format, originally "ShockWave Flash") is Macromedia/Adobe's container for Flash content — animation, vector art, ActionScript, and embedded video using Sorenson Spark (FLV1) or VP6. Although Adobe officially ended Flash Player support on December 31, 2020 and began blocking content in browsers on January 12, 2021, the SWF container remains useful in narrow, deliberate scenarios.

• Archival ingest for legacy e-learning courses — SCORM packages from Articulate Presenter, Adobe Captivate 5/6, and Lectora Inspire 11 commonly bundle Flash assets. If a corporate LMS still serves these courses through Ruffle or a Flash projector, re-packaging modern WMV training footage as SWF keeps the asset pipeline consistent until full HTML5 migration is funded.
• Museum and Internet Archive preservation — the Internet Archive's Flash collection uses the Ruffle open-source emulator to keep period-accurate playback alive; SWF is the canonical wrapper for that workflow, and Ruffle fully supports ActionScript 1.0 and 2.0 content with ActionScript 3.0 support in progress.
• Standalone Flash projectors — Adobe's Flash Player Projector (flashplayer_32_sa.exe on Windows, .dmg on macOS) still launches .swf files offline. Kiosks, trade-show loops, and offline museum installs that were built around the projector continue to play SWF without an internet connection.
• Recreating Flash-era animation pipelines — students learning the history of vector animation, motion designers studying 2002-2012 web aesthetics, or developers porting legacy ActionScript games to Ruffle need a way to bake WMV reference footage into SWF for side-by-side comparison or asset replacement.
• Embedded media in older authoring tools — Adobe Director 12, Toon Boom Studio 8, and SwishMax 4 accept SWF as a native asset format. If your editing system predates 2017, SWF is often the only video container the timeline will ingest.
• CD-ROM and DVD-Video bonus content rebuilds — restoring a 2005-era interactive disc menu or "Making of" featurette frequently means re-encoding the WMV master back into the original SWF wrapper the AutoRun shell expects.

WMV vs SWF — Format Comparison

Quality Preset and Compression Mode Guide

Frequently Asked Questions

Is SWF still a sensible target format in 2026?

Only in narrow cases. Adobe ended Flash Player support on December 31, 2020 and blocked Flash content in the player from January 12, 2021. Modern browsers — Chrome, Firefox, Edge, Safari — removed the NPAPI/PPAPI plugin years earlier. SWF makes sense today for (a) feeding legacy authoring tools, (b) playback through the Ruffle emulator, (c) Adobe's standalone Flash Player Projector on offline kiosks, or (d) archival pipelines that need to keep period-accurate file formats. For general video sharing, MP4/H.264 is the right target. If that fits your use case, see WMV to MP4 instead.

What video codec ends up inside my SWF?

xconvert encodes the video track as Sorenson Spark (FLV1), Macromedia's licensed variant of H.263 that has been the default Flash video codec since Flash Player 6 (2002). It's the most widely compatible option across Flash Player versions and Ruffle. SWF format version 9 and 10 also allow H.264 inside SWF, but for maximum playback compatibility with Ruffle and standalone projectors, Sorenson Spark is the safer choice.

How do I actually play the SWF after conversion?

Three practical options: (1) install the Ruffle browser extension or desktop app — it's an open-source Flash Player emulator written in Rust and is what the Internet Archive uses; (2) keep Adobe's standalone Flash Player Projector binary around (Adobe removed it from active downloads but mirrors exist on archive.org); (3) for ActionScript-free linear video, you can also remux the embedded FLV1 stream to a .flv file and play it in VLC or mpv.

Will the conversion preserve ActionScript or interactive elements?

No. WMV is purely linear video — there is no ActionScript, no buttons, no vector graphics in the source. The resulting SWF is a video-only Flash file: a single timeline playing back the encoded WMV frames inside the SWF container. If you need interactive Flash, you'd author it from scratch in a tool like Adobe Animate (formerly Flash Professional) or one of the Ruffle-friendly open-source authoring projects.

Why is my SWF larger than the original WMV?

SWF with Sorenson Spark (FLV1, an H.263 derivative) is significantly less efficient than WMV3/VC-1 or modern H.264/H.265. H.263 dates to 1996; VC-1 (WMV3) is roughly 2003-era; H.264 is 2003 onward. For the same perceptual quality you may need 1.5-3x the bitrate compared to the WMV source, especially on high-motion footage. Use the Specific file size or Constant Bitrate options if you have a hard cap, but expect quality loss at parity bitrates.

Can Ruffle play any SWF this tool produces?

Ruffle fully supports ActionScript 1.0 and 2.0 content; ActionScript 3.0 support is still under active development. Because xconvert produces video-only SWFs without scripting, Ruffle handles them well in both browser-extension and desktop modes. Test specifically against the Ruffle version your audience uses — playback behaviour for embedded video has improved noticeably across recent Ruffle releases.

Does xconvert support batch WMV to SWF conversion?

Yes. Drop multiple .wmv files at once; each is processed individually with the settings you pick. There is no enforced file count limit, no watermark on output, and no sign-up. Large clips do take longer because Flash-era codecs encode slower than modern codecs on the same hardware.

What's the difference between SWF and FLV?

SWF is a generic Flash container that can hold vector graphics, fonts, ActionScript, and (optionally) embedded video. FLV (Flash Video) is video-specific — a streaming-oriented container that holds only video, audio, and metadata. For pure video, FLV is more compact and easier to remux; SWF is appropriate when you specifically need the asset to load inside a Flash authoring tool or projector. If you only need the video stream, WMV to FLV may be a better fit.

Are my uploads private?

Files convert through xconvert's processing pipeline over HTTPS and are deleted after your session. No account, no email, no marketing pixel. Treat any third-party converter cautiously when uploading footage that contains personally identifiable information, but for archival WMV and stock-style content the workflow is straightforward.