Convert APNG to ICO Online

Convert APNG to ICO: What This Tutorial Covers

You have an animated PNG — a logo loop, a sticker, an exported UI animation — and you need a Windows .ico: a favicon, a shortcut icon, or an application icon. ICO is a still format, so the job is really two things at once: lift one frame out of the animation, and write it at a size Windows and browsers expect. This page walks through both, then covers the size choices and the mistakes that produce a blurry or invisible icon.

How to Convert APNG to ICO

1. Upload Your APNG File: Drag the .apng onto the drop zone or use the file picker. Files saved as .png that contain animation chunks are accepted too, which is how several exporters write APNG.
2. Pick the Icon Size Under Image Resolution: Open Preset Resolutions and choose 256, 192, 180, 128, 64, 48, 32, 24 or 16 pixels. These are the sizes that actually get used by Windows, browsers and mobile home screens — there is no point generating anything in between.
3. Check the Shape Before Converting: The preset list is the only sizing mode ICO output offers — there is no percentage, "Keep original", Width, Height or Width x Height box here. The preset sets the icon's height and the width follows the source frame's aspect ratio, with nothing cropped or padded, so a square APNG stays square while a 16:9 animation at 256P comes out 455x256 — wider than the 256 an ICO directory entry can declare. Use 128P for widescreen artwork, or crop it square first.
4. Convert and Download: Press Convert and save the .ico. No sign-up and no watermark. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours.

Walk-through: Choosing the Right Icon Size

The 256-pixel ceiling is not a converter limitation — it is baked into the file format. An ICO directory entry stores width and height in a single byte each, and a stored value of 0 is defined to mean 256, so 256x256 is the arithmetic maximum the header can express. Windows Vista made that size practical by allowing the frame to be PNG-compressed inside the ICO instead of stored as a raw bitmap.

Which size you want depends entirely on where the icon lands:

A note on how a classic favicon works: favicon.ico is traditionally a bundle that carries 16, 32 and 48 in one file, and the browser picks whichever fits the slot it is drawing. This tool writes a single image into the ICO at the size you choose. For most modern sites one well-chosen 32-pixel icon plus a PNG apple-touch-icon is enough; if you specifically want the multi-size bundle, generate each size here and combine them in an icon editor.

Common Errors and How to Fix Them

• The icon looks blurry or muddy at 16 or 32 pixels — detail that reads fine at 256 collapses at tab size. Fix it at the source: use a simplified mark rather than the full logo, and convert that simplified artwork.
• The icon has a white or black box around it — the source frame was not actually transparent. Open the APNG and confirm the canvas has alpha rather than a painted background; a flattened export cannot be un-flattened by a converter.
• The wrong moment of the animation ended up in the icon — the converter uses the file's default image, not an arbitrary frame. Re-export the APNG so the frame you want is the default one, or export that single frame as a PNG and use PNG to ICO.
• Windows still shows the old icon after you replace the file — that is the Windows icon cache, not the file. Log out and back in, or clear the icon cache, before assuming the conversion failed.
• The browser ignores your new favicon — favicons are cached aggressively. Hard-reload, or request the file path directly to confirm the server is actually serving the new .ico.

ICO Format at a Glance

Frequently Asked Questions

Which frame of the APNG becomes the icon?

The file's default image. An APNG is a normal PNG whose IDAT stream holds a still picture, with the animation carried in extra acTL, fcTL and fdAT chunks around it; our decoder reads that still image. According to the PNG Third Edition specification, the default image is also the animation's first frame when the file includes an fcTL chunk before IDAT — and when it does not, the default image is deliberately outside the animation and can be a different picture entirely. That is why an APNG occasionally converts to a still you were not expecting.

Can the ICO keep my animation?

No, and no converter can change that. The ICO container has no concept of frame timing — Windows handled animation with the separate ANI format for cursors. Animated favicons in general are barely worth pursuing — browser support for them is thin and most render a single frame regardless of what you supply. A crisp static icon is the practical choice.

Will transparency survive the conversion?

Yes. ICO has supported 32-bit images with a full 8-bit alpha channel since Windows XP — the same alpha model APNG uses — so soft edges, drop shadows and anti-aliased curves carry across without a hard matte. The one thing to check is that your source really has alpha; a screenshot or a flattened export will bring its background with it.

Why can I not make an icon larger than 256 pixels?

Because the format cannot describe one. Each image inside an ICO is indexed by a directory entry whose width and height fields are one byte each, with 0 reserved to mean 256 — so 256 x 256 is the ceiling by construction, not by convention. Requests above that are clamped rather than rejected. If you need a larger app icon, use PNG: modern platforms take 512 and 1024 pixel PNGs directly.

What size should I pick for a website favicon?

32 x 32 is the best single choice today — it covers standard and high-DPI browser tabs and still scales down acceptably. Use 16 x 16 only if you are targeting the legacy slot specifically. For iOS home screens you want a 180-pixel image, and for Android or a PWA a 192-pixel one, both of which are in the preset list here.

Can I use this ICO as a Windows application or folder icon?

Yes. A single-image .ico works as a shortcut icon, a folder icon, or an executable's icon. For those uses pick 48, 128 or 256 rather than a favicon size, so the icon stays sharp in Explorer's larger views. Remember that Windows caches icons, so a change may not appear until the cache refreshes.

Why is my ICO bigger than the APNG frame it came from?

Because ICO entries below 256 x 256 are conventionally stored as uncompressed bitmap data with a separate mask, while PNG data is DEFLATE-compressed. A 48-pixel icon is small either way, so the difference rarely matters — but it is why an ICO is not automatically smaller than the image it was built from.

Should I convert to ICO or just use a PNG?

Use ICO when Windows is involved, or when you want a file at the classic /favicon.ico path that every browser probes without being told to. Use PNG when you are declaring icons explicitly in HTML or a web app manifest, because PNG gives you arbitrary sizes and smaller files. If you need the still frame as a PNG rather than an icon, convert APNG to PNG instead.