ICO to AVIF
Converts ICO files to AVIF format — favicons and app icons to next-gen web images. All conversion happens locally in your browser with no file size limits.
Runs on Canvas
How to Use the ICO to AVIF
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See allBulk ICO to AVIF
Convert Windows icon files to ultra-efficient AVIF format. Shrink icon libraries for the web while supporting transparency and true color. Everything runs locally in your browser — nothing is uploaded.
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Frequently Asked Questions
Why convert ICO to AVIF?
ICO (Windows Icon) uses lossless (multiple sizes) encoding and is best for favicons and app icons — standard format for website bookmarks and Windows application icons. AVIF (AV1 Image File Format) uses lossy or lossless encoding and excels at next-gen web images — royalty-free format with better compression than WebP and JPEG. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
Why AVIF from icons?
Icon libraries in AVIF load in a fraction of ICO bytes with transparency intact. Web apps serving dozens of icons feel the difference on slow networks.
Which icon size converts best?
Largest embedded size (usually 256px) — multi-resolution ICOs carry several; the tool takes the biggest for cleanest output.
Transparency preserved?
Yes — alpha channels carry into AVIF. Verify one icon on dark and light backgrounds before batching hundreds.
Do icon files upload?
No — conversion runs locally in your browser on Canvas. Only saves touch the network — downloads are unlimited.
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AVIF to ICO
AVIF to ICO output is not produced here — AVIF input decodes, but Canvas cannot encode ICO, so conversion fails locally. Convert AVIF to PNG/JPG/WebP instead — local, unlimited saves.
Bulk Image Format Converter
Convert image batches to JPG, PNG, WebP, AVIF, GIF, BMP, ICO, or SVG outputs (JPEG/PNG/WebP/AVIF/HEIC/HEIF/GIF/BMP/ICO/SVG inputs; HEIC via heic2any, SVG rasterized at intrinsic size or 1024px fallback) with a quality slider (10–100, default 80; applies to lossy encodes). Pair pages (?from/?to) preset the output. Flat ZIP renamed per file — local, 5-file guest batches, 25 signed-in, 500 Pro.
Batch Image Converter
Convert a batch of images to one output — JPG, PNG, or WebP — at quality 10–100% (default 80%), capped at 4096px longest side, then download everything as a ZIP. Files that fail conversion fall back to their originals inside the same archive — local library work.
Last updated October 2026