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Need help?ICO to ASF Converter
ICO is a Microsoft Windows icon format — a tiny square still image, usually 16×16 up to 256×256 pixels. ASF (Advanced Systems Format) is Microsoft's streaming media container, the basis for WMV video and WMA audio. Converting ICO to ASF wraps your single icon into a short, silent video clip that holds that one image on screen. It is a niche, novelty conversion: if you actually want a still image that opens everywhere, convert to ICO to PNG instead.
What You Actually Get
This is a still-to-video conversion, so a few things are worth knowing up front:
- The output ASF is a silent video (no audio track) showing your icon for a fixed duration you choose.
- Because an ICO is small, the video is heavily upscaled and will look blocky unless you set a sensible resolution. A 32×32 icon stretched to 1080p is mostly soft edges.
- By default xconvert encodes the ASF with the H.264 video codec. Switch the Video Codec to WMV 2 if you need it to play in legacy Windows Media Player.
ICO Format at a Glance
| Property | Value |
|---|---|
| Type | Raster icon image (still) |
| Developer | Microsoft (Windows) |
| Introduced | Windows 1.0 (1985) |
| Stored image data | BMP or PNG |
| Common sizes | 16×16, 32×32, 48×48, 256×256 |
| Max recommended size | 256×256 pixels |
| Transparency | Yes (alpha / mask) |
| Best for | Favicons, desktop and app icons |
ASF Format at a Glance
| Property | Value |
|---|---|
| Type | Streaming media container (audio/video) |
| Developer | Microsoft |
| Public release | February 1998 |
| Typical video codec | WMV / VC-1 (xconvert defaults to H.264) |
| Typical audio codec | WMA — none here, output is silent |
| Related extensions | .wmv (video), .wma (audio) |
| License | Open spec, not free (Microsoft license) |
| Best for | Windows Media streaming and playback |
How to Convert ICO to ASF
- Upload Your ICO File: Drag and drop your icon onto the page or click "+ Add Files" to select it from your computer.
- Set Image Duration: Open Advanced Options and pick how long the icon should show — from a single frame up to 10 seconds per frame.
- Choose Video Resolution and Codec: Leave "Keep original" for the icon's native size, or pick a Fixed Resolution preset; switch the Video Codec to WMV 2 for legacy Windows Media Player.
- Convert and Download: Click Convert and download your ASF. No sign-up, no watermark. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours.
Frequently Asked Questions
Why is my ASF file silent after converting from ICO?
Because an ICO is a still image with no sound. xconvert builds the video by holding that single picture on screen for the duration you set, so there is no audio track to add. The result is a silent clip — that is expected, not a bug.
Why does the ASF video look blurry or blocky?
ICO icons are small, often 32×32 or 48×48 pixels. When that tiny image is stretched to a video resolution like 720p or 1080p, the pixels are heavily upscaled and edges go soft. For a sharper result, keep the original resolution or choose a small Fixed Resolution preset that is close to the icon's real size.
Should I use ICO to ASF or just convert ICO to PNG?
If you only need a still image that opens in every browser and image viewer, convert ICO to PNG — that keeps it a sharp, transparent image. Choose ASF only when you specifically need the icon as a short video clip for a Windows Media workflow.
Which video codec does the ASF use, and can I change it?
By default the ASF is encoded with H.264. In Advanced Options you can switch the Video Codec to WMV 2 (or WMV 1), which is the safest choice for older Windows Media Player versions that expect a Windows Media codec inside the .asf container.
Can I control how long the icon stays on screen?
Yes. The Image Duration setting ranges from a single frame at a chosen frame rate up to 10 seconds per frame, so you decide whether the ASF is a brief flash or a longer hold on the icon.
How long does the converted ASF stay on your servers?
Your file is uploaded over an encrypted connection and processed on our servers, then deleted automatically after a few hours. Nothing is shared, made public, or kept long-term, and no sign-up is required.
Does converting to ASF keep the icon's transparency?
No. ICO supports a transparent background, but a video frame is opaque, so transparent areas are filled with the Background Color you pick in Advanced Options (white by default). In our testing, a 256×256 icon with a transparent edge came out with a solid white border unless we changed that color first.
My ICO holds several sizes — which one ends up in the video?
A single .ico file can bundle multiple images at different sizes (for example 16×16, 32×32, 48×48, and 256×256) so Windows can choose the right one for each context. The converter renders one still from the icon into the video frame, so for the sharpest result start from an icon that includes a large size such as 256×256. A file that only contains tiny 16×16 or 32×32 images will look soft once it is scaled up to a video resolution.