Is this AVIF to ICO converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple AVIF files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

Will the image quality change after conversion?

It depends on the formats involved. Converting to a lossless format like PNG preserves every pixel exactly. Converting to a lossy format like JPEG or WebP applies compression — we default to 85% quality, which looks identical to the original for almost all images. You won't notice a difference unless you zoom in pixel-by-pixel.

Do you support batch image conversion?

Yes — drop multiple images at once and they all convert in parallel. Free accounts handle up to 5 at a time; Pro is unlimited. Download everything as a single ZIP when you're done.

What ICO sizes does the converter produce?

The output ICO contains 16×16, 32×32, and 48×48 pixel frames — the standard sizes needed for browser favicons and Windows application icons.

Should I convert a high-resolution AVIF to ICO?

Yes — start with the largest version of your logo or icon in AVIF. The converter will scale it down cleanly to the required ICO frame sizes.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

AVIF to ICO Converter — Free, Online, No Upload

How to convert AVIF to ICO online

1
Drop your AVIF file
Drag and drop your AV1 Image File Format file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs AV1 Image File Format → Windows Icon Format entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your ICO
Your Windows Icon Format file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

AVIF vs ICO: format overview

AVIF

AV1 Image File Format

Alliance for Open Media · 2019

Compression: lossy
Color depth: 12-bit
Transparency: Yes

✓ Smallest file size of any image format (50% smaller than WebP)
✓ Excellent HDR and wide-gamut color support
✗ Slow encoding (computationally expensive)

ICO

Windows Icon Format

Microsoft · 1985

Compression: lossless
Transparency: Yes

✓ Multiple resolutions in a single file
✓ Required format for Windows app icons and favicons

AVIF magic bytes: 00 00 00 .. 66 74 79 70 61 76 69 66

ICO magic bytes: 00 00 01 00

Why convert AVIF to ICO?

AVIF is increasingly common as a web image format, and it's natural to want to use an existing AVIF graphic — a logo, an icon, a brand mark — as a favicon or Windows application icon. The problem is that browser favicon pipelines and Windows icon tooling don't accept AVIF files directly; they need ICO.

ICO is the container format for Windows icons and browser favicons. It packages one or more image sizes — 16×16, 32×32, 48×48, and sometimes 256×256 — into a single file. When you convert AVIF to ICO, the tool handles both the format conversion and the resizing needed for the different icon sizes. Browsers automatically pick the right size for the context (browser tab, bookmark, home screen shortcut).

For best results, the source AVIF should be a square graphic with a clear subject centered in the frame. Complex scenes and photographs rarely look good at 16×16 or 32×32 pixels — the detail simply disappears. If the AVIF contains a logo or icon-style graphic, the conversion will work well. After converting, test the favicon using a tool like RealFaviconGenerator to check how it renders across browsers and operating systems before publishing it.

Quality & file size: AVIF to ICO

Typical file sizes: AVIF 0.8–2 MB → ICO 10–100 KB.

Converting from lossy AVIF to lossless ICO will not recover detail the AVIF codec already discarded — but the output will not degrade any further. This is useful when you need a lossless format for editing or compatibility without additional compression artifacts.

Color depth: AVIF supports 12-bit, ICO supports standard color.

Transparency: AVIF supports transparency. ICO preserves transparency.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your AVIFfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.