Convert APNG to WMV Online

Convert APNG to WMV: What This Tutorial Covers

Windows Media Player, older PowerPoint decks, and a long tail of Windows-only software will not open an .apng at all. This tutorial walks through turning that animation into a WMV clip those tools do play — and through the two things that always surprise people: the result is silent, and the APNG's transparency is replaced by a solid colour you choose before converting.

How to Convert APNG to WMV

1. Upload Your APNG File: Drag and drop the file onto the page or click "Add Files". Both .apng and animated .png are accepted, and each upload becomes its own WMV.
2. Set the Quality Preset: Under File Compression, Quality Preset starts at Very High (Recommended), which keeps the animation close to the source; step it down when the file has to be smaller, or use Constant Quality to drive the encoder's quality scale directly.
3. Pick the Background Color and Video resolution: Background Color — White by default — is what replaces every transparent pixel, since WMV carries no alpha channel. Video resolution stays on Keep original unless you choose a preset, a percentage, or an exact Width × Height.
4. Convert and Download: Click Convert and save the .wmv. Uploads travel over an encrypted connection, run on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.

Walk-through: Codec, Quality, and the Background Colour

WMV is not one codec but a family, and the file you download is a Windows Media Video bitstream inside Microsoft's ASF container. The Video Codec control in the advanced options offers the two encodable generations.

The practical consequences:

• Quality Preset maps onto the encoder's internal quality scale rather than a CRF value, so treat the presets as relative steps: Very High for a clean look, Medium when the file has to travel, Low only for rough previews. Flat, hard-edged animation shows compression damage sooner than photographic content, which is why the default sits at the top of the range.
• Background Color is not cosmetic. APNG art is usually cut out against transparency, and the encoder composites that transparency onto this colour before compressing. White is the default and is normally what you want for a slide or a light document; matching the destination's background is what stops a visible box appearing around the animation.
• Video resolution is worth pinning when the clip is going into a slide. Scaling once here, at encode time, looks better than letting PowerPoint stretch a small clip to fill a placeholder.

Common Errors and How to Fix Them

• "The clip has no sound" — Expected. An APNG carries no audio, so the converter writes a video-only WMV; the audio codec control is hidden for image sources. Add music in a video editor afterwards if you need it.
• "My cut-out logo has a white box around it" — That is the default Background Color showing through where the alpha channel used to be. Re-convert with Background Color set to your slide or page colour. Transparency cannot be recovered after the encode.
• "PowerPoint for Mac will not insert the file" — Microsoft's own format list says Windows Media files (.wmv, .wma) are not supported in PowerPoint for macOS, and it recommends MP4 with H.264 video and AAC audio as the format to use. Convert the APNG to MP4 instead for any cross-platform deck.
• "The video will not play in my browser" — No browser plays WMV in a <video> element. WMV is a desktop and Office format; use MP4 or WebM for web pages.
• "QuickTime on my Mac says it cannot open the file" — QuickTime has never supported Windows Media without third-party components. VLC or mpv will open the same file on macOS, or convert to MP4 for native playback.
• "The animation looks jerky" — The clip inherits the frame timing stored in the APNG. Very low source frame rates stay low after conversion; re-time the animation before converting rather than expecting the encoder to smooth it.

When This Doesn't Work

WMV earns its place in exactly one situation: a Windows-only workflow that will not accept anything else — an old PowerPoint template, a kiosk or digital-signage player from the Windows Media era, a corporate tool that predates HTML5 video. Everywhere else it costs you compatibility for no gain, because Windows Media Video 8 is a codec generation behind H.264 and two behind HEVC. If your clip has to reach a Mac, a phone, a browser, or a social platform, APNG to MP4 is the right target; for a modern web page, APNG to WebM is smaller again. And if the animation should stay an animation with its transparency intact, do not convert to video at all — APNG to GIF keeps both the motion and a transparent colour index.

Frequently Asked Questions

Why is the WMV silent?

Because the source has no audio. An animated PNG is an image format, so the converter muxes a video stream only — that is why there is no audio codec choice on this page. WMV itself can carry Windows Media Audio; the track simply has nothing to hold. Add a soundtrack in a video editor after conversion if the clip needs one.

Can a WMV keep the transparency from my APNG?

No. The encoder writes opaque video and composites transparent pixels onto the Background Color before compressing, so pick that colour to match wherever the clip will sit. If the transparent background is essential, keep it as an image: APNG to GIF preserves the animation and a single transparent colour index, while APNG to WebP preserves a full 8-bit alpha channel on the first frame.

Which WMV codec does the converter use?

Windows Media Video 8 — the codec FFmpeg calls wmv2 — unless you switch the Video Codec control to WMV 1 (Windows Media Video 7). Microsoft's own documentation covers Windows Media Video 9 as the current generation with legacy access to versions 7 and 8, but there is no open-source WMV 9 / VC-1 encoder, so version 8 is the newest that can be produced here. Every mainstream Windows decoder still handles it.

Where will the WMV file actually play?

Is WMV the same thing as ASF?

Almost. ASF (Advanced Systems Format) is Microsoft's container; a .wmv file is an ASF file whose video stream is Windows Media Video, and a .wma is an ASF file carrying Windows Media Audio. If a tool asks specifically for an .asf wrapper, APNG to ASF produces the same kind of file with the other extension.

Will the WMV be smaller than the APNG?

Nearly always, and often by a wide margin. APNG stores every frame losslessly with DEFLATE and cannot describe what stayed the same between frames; a WMV encode only codes the differences. The saving is largest on long loops with static areas. Note that a modern H.264 MP4 of the same animation will usually be smaller still at matching quality — WMV's efficiency is a generation behind.

Does the WMV keep every frame of the animation?

Yes. The animated PNG is decoded as a frame sequence, so the whole animation is re-encoded with the frame delays stored in the source file. That is why there is no per-image duration setting here, unlike the still-image-to-video pages.

What happens to my uploaded APNG file after the conversion?

It is uploaded over an encrypted (TLS) connection, converted on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.