ICO to GIF Converter
Convert ICO to GIF in your browser. ICO files usually come from website favicons, Windows programs and installers; GIF is the better fit for short animations and reactions that must play everywhere. You get a GIF with an optimised palette of up to 256 colours per frame, dithered. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
ICO expected · other image formats also work
How to use ICO to GIF
- 1
Add your ICO files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the GIF is written losslessly. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .gif files one at a time or together as a ZIP.
Why use Aback Images for ico to gif
Where the GIF goes next
GIF opens in every browser, operating system, chat app and editor.
GIF next to ICO
Both sides are lossless, so the size depends on how well the GIF encoder handles this picture compared with the ICO's each size stored as a headerless BMP or as a complete PNG.
Written without a lossy pass
The GIF is written losslessly, so the pixels decoded from the ICO arrive unchanged.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
ICO vs GIF
What changes from ICO to GIF
Encoding: the ICO uses each size stored as a headerless BMP or as a complete PNG; GIF uses lossless LZW over a palette of at most 256 colours, and the download is a GIF with an optimised palette of up to 256 colours per frame, dithered.
Bit depth: 1 to 32 bits per pixel, set per size in the ICO; GIF allows 8 bits per pixel, as indexes into a palette, and the GIF written here has 8 bits per pixel (palette).
Colour: RGB or a palette, per image in the ICO; GIF supports an indexed palette of up to 256 colours per frame, written here as an indexed palette of up to 256 colours.
Transparency: the ICO stores it as 8-bit alpha in 32-bit and PNG entries, or a 1-bit mask in old icons; the GIF keeps it as on or off per pixel, so soft edges become hard.
Other images: the ICO can hold several sizes of the same picture, typically 16, 32, 48 and 256 px; only the main image is converted.
Metadata: the ICO can carry only a directory of the sizes inside, with no EXIF; GIF can carry comment and application extension blocks, but no EXIF, but nothing is copied across.
About ICO
ICO is a container that bundles several sizes of the same icon (16, 32, 48, 256 px) into one file. It is still the most compatible format for website favicons and Windows app icons.
An ICO starts with a 6-byte ICONDIR (type 1 for icons) and a 16-byte entry per image giving width, height, colour count and offset. Each image is either a BMP without its file header plus an AND mask, or a complete PNG.
ICO files usually come from website favicons, Windows programs and installers.
About GIF
GIF is the classic animated image format. It is limited to 256 colours per frame and 1-bit transparency, so photos look grainy and files are large, but it plays everywhere.
A GIF starts with 'GIF89a' (or the older 87a), a logical screen descriptor and an optional global colour table, then image blocks, each preceded by a graphic control extension that sets its delay and transparent colour.
When converting ICO to GIF makes sense
GIF is the better choice for short animations and reactions that must play everywhere, while ICO suits favicons and Windows icons.
GIF strengths: Animation that works everywhere; Simple, universally supported; Good for small flat graphics. Drawbacks to weigh: Only 256 colours per frame; Hard-edged transparency only; Large files for photos or long clips.
Limitations
- The largest image in the icon is the one converted; smaller sizes that were hand-tuned for 16 px are not carried over.
- GIF transparency is on or off per pixel, so soft edges and shadows get a hard outline.
- GIF stores at most 256 colours per frame, so photographs show dithering or banding.
- GIF transparency is all or nothing per pixel, so soft shadows and anti-aliased edges get a hard fringe.
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Frequently asked questions
Does converting ICO to GIF lose quality?
GIF is written losslessly, so the pixels are stored exactly as decoded. Not carried over: any several sizes of the same picture.
Which apps open GIF files?
Every browser, operating system, chat app and editor.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.