Base64 to ICO
Paste a Base64 string or a data:image/x-icon;base64, URI below and click Decode Base64 to ICO. The decoder checks the file signature, shows a preview and lets you download the result as a real .ico file.
How to convert Base64 to ICO online
- Paste the Base64 value into the input box. Data URIs, whitespace and line breaks are handled automatically.
- Press Decode Base64 to ICO.
- Check the preview and the detected file type, dimensions and size.
- Click Download to save the .ico file.
Important notes about the decoder
- The decoder detects the real file type from the decoded bytes (magic number). If your string is not actually ICO, you will see the real type and can still download it.
- Invalid characters are reported instead of silently producing a broken file. If decoding fails, try the Base64 repair tool.
- Nothing is uploaded: the data is decoded locally by your browser, so even confidential documents stay on your device.
About ICO
ICO is a container that stores one or more small images (commonly 16×16, 32×32 and 48×48) in a single file. Browsers have used favicon.ico for site icons since the late 1990s.
Embedding a favicon as a Base64 data URI in a <link rel="icon"> tag removes one HTTP request, which is a common trick for single-file HTML pages, offline apps and email templates.
| Developed | Microsoft |
|---|---|
| Contains | BMP or PNG images |
| Transparency | Yes |
| Typical use | Favicons, app icons |
| File signature | 00 00 01 00 |
Frequently asked questions
How do I convert Base64 to ICO?
Paste the Base64 string into the box above and click "Decode Base64 to ICO". You can preview the result and download it as a .ico file.
Why is my Base64 ICO not displaying?
Usually the string is truncated, contains URL-safe characters, or was double-encoded. The decoder reports the exact problem; the Base64 repair tool can fix most of them automatically.
Do I need to remove the data URI prefix?
No. The decoder strips "data:...;base64," automatically and uses the MIME type from it as a hint.
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