AVIF to ICO Converter
Convert AVIF files (released 2019 (AOMedia), Lossless + Lossy (AV1-based)) to ICO (Container — holds PNG or BMP frames, typically Small — typically <100 KB per file). Runs in your browser — no upload, no signup.
Based on 12,431+ conversions delivered
Need to turn AVIF files into ICO? This tool does it in seconds, right in your browser. AVIF is known for Bandwidth-critical pages with modern audiences and ICO for Favicons, Windows desktop icons, executable icons, so the conversion makes sense whenever your workflow has standardised on ICO or your target platform expects it. In our sample set, ICO files ran about 3783% larger than the AVIF source. There's no software to install and nothing is sent to a server — the fast path encodes locally and hands you the file immediately. Read on for a plain-language comparison of AVIF and ICO, the settings that matter, the pitfalls to avoid, and answers to the questions people ask most about AVIF → ICO.
Looking to programmatically convert AVIF to ICO?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted output back — no browser, no UI, no rate limits on paid tiers.
Sub-second response on common pairs
Webhook delivery for batch jobs
100+ format pairs supported
AVIF vs ICO — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
AVIF
- Year released
- 2019 (AOMedia)
- Compression
- Lossless + Lossy (AV1-based)
- Transparency
- Yes
- Animation
- Yes
- Browser support
- Modern browsers (~90% since 2023)
- Best for
- Bandwidth-critical pages with modern audiences
ICO
- Year released
- 1985 (Microsoft)
- Compression
- Container — holds PNG or BMP frames
- Transparency
- Yes
- Animation
- No
- Browser support
- Universal — every browser fetches /favicon.ico
- Best for
- Favicons, Windows desktop icons, executable icons
Real AVIF → ICO file sizes
We ran a fixed set of sample images through this exact converter so you can see the typical size impact before converting your own files.
| Sample image | AVIF size | ICO size | Change |
|---|---|---|---|
| Photo | 17.4 KB | 264.1 KB | +1414% larger |
| Screenshot / UI | 746 B | 264.1 KB | +36146% larger |
| Logo / transparency | 2.2 KB | 264.1 KB | +11754% larger |
Measured on a 256×256 sample set with this converter on 2026-05-28. Real-world files vary with resolution, colour and content.
Heads up before converting AVIF → ICO
What changes — and what your conversion will cost — based on how AVIF and ICO differ.
Animation collapses to a single frame
AVIF can hold multiple frames in one file; ICO cannot. The conversion keeps only the first frame, so every loop, transition, or sprite sheet collapses into a still image. If the motion matters, pick an animated target (WebP, AVIF, GIF, APNG, JXL) — or extract frames separately first.
Higher bit depth gets clipped
AVIF stores image data at a higher bit depth per channel than ICO encodes by default. Subtle gradients, HDR highlights, and 16-bit print sources collapse into the narrower 8-bit range — the difference is invisible in most photos, but banding shows up in skies, soft skin tones, and low-key shadows. If you need the precision (retouching, print, raw archive), keep the AVIF source and convert a copy.
Embedded color profile gets dropped
AVIF can carry an embedded ICC color profile; ICO doesn't preserve one. Colour-managed pipelines (proofing, brand-accurate print, wide-gamut displays) interpret the missing profile as sRGB, which shifts hues on anything captured in Display P3 or Adobe RGB. If the colour math matters, convert the image to sRGB explicitly before exporting to ICO.
Best practices for AVIF → ICO
Concrete settings to pick before you convert AVIF to ICO.
- Always preview the ICO output before bulk-downloading — colour shifts, transparency surprises, and quality artifacts show up in the preview before they ship.
- Strip EXIF metadata if file size or privacy matters — camera GPS coordinates, timestamps, and serial numbers travel inside the image bytes by default.
- ICO is lossless, so quality settings don't apply — but you can still shave bytes by quantising the palette (pngquant for PNG, gif2webp for GIF) when the image has a limited colour count.
- Verify the alpha channel rendered as expected — premultiplied vs straight alpha and edge halos around antialiased pixels are the most common surprises when going to ICO.
- For web ICO delivery, encode in sRGB — wider colour spaces (Display P3, ProPhoto) render unpredictably across browsers and email clients.
- Converting to ICO silently drops EXIF/XMP metadata embedded in the source. That's a privacy win if the file is being shared, but a loss if you rely on capture date, GPS, or camera settings — copy what you need to a sidecar before converting.
When NOT to convert AVIF → ICO
Honest cases where this conversion is the wrong call — pick a different format or keep your AVIF source.
Skip if the file is bound for print
ICO is a delivery-grade web format. Print pipelines (offset, large-format, packaging) expect TIFF, PDF, or high-bit-depth PNG with embedded ICC profiles and a CMYK option. Converting AVIF to ICO for a print job will likely fail prepress checks — keep the original or convert to a print-friendly format instead.
The importance of a good image conversion
Why getting AVIF → ICO right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
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