Can I convert multiple ICO files at once?

Yes — this tool supports batch conversion. Drop up to 25 or more ICO files at once, monitor per-file progress, then download individually or as a single ZIP archive.

Does my data get uploaded to a server?

Never. All ICO decoding and AVIF encoding happens entirely in your browser using JavaScript and the Canvas API. Your images never leave your device.

Which browsers support AVIF output?

Chrome 85+, Edge 121+, and Firefox 93+ support AVIF encoding via the Canvas API. Safari does not yet support canvas AVIF output; Safari users will receive a fallback WebP or see a browser compatibility notice.

What quality setting should I use?

The default quality of 80 is ideal for most use cases — good visual quality with significant file size reduction. Use 90–95 for archival work and 60–70 for web thumbnails where size matters most.

ICO to AVIF Converter

Convert ICO icon files to modern, high-efficiency AVIF images entirely in your browser. Batch convert multiple ICOs at once, adjust quality, preview thumbnails, and download individually or as a ZIP. No uploads, no account required.

⚠ Your browser does not support AVIF encoding. Files will be saved as WebP instead. For AVIF output, use Chrome 85+, Edge 121+, or Firefox 93+.

🖼️

Drop ICO files here

or Browse Files · Multiple files supported

Quality: 80

Download as ZIP ZIP named with timestamp · Individual download always available per file

What This Tool Does

Converts ICO icon files to AVIF format entirely in your browser. ICO is a container format designed for Windows icons and favicons; AVIF is a modern, highly efficient image format ideal for web delivery. Whether you need to repurpose icon art as a web image or extract a usable AVIF from a favicon, this tool handles batch conversion with quality control. No server upload, no account, no file size limits.

Who This Is For

Web developers who need a web-optimized AVIF image extracted from an ICO favicon or icon set
Designers repurposing icon artwork from ICO format into a modern web-ready format
Teams migrating legacy icon libraries to modern web image formats
Anyone who needs a quick AVIF from an ICO file without installing software

Example: Input: favicon.ico (multi-size Windows icon) → Output: favicon.avif (modern AVIF, ready for web use)

💡 Need a different output format? Try BMP to AVIF for bitmap sources, HEIC to AVIF for iPhone photos, or TIFF to AVIF for lossless originals. To convert back to ICO format, see our HEIC to ICO tool.

Related Guides & Tutorials

Guide

ICO to AVIF: Complete Conversion Guide

What ICO and AVIF formats are, when converting makes sense, and how to get the best results from icon source files.

Tutorial

How to Convert ICO to AVIF: Step-by-Step

A hands-on walkthrough for converting ICO files to AVIF in your browser — batch mode, quality control, ZIP download, and more.

Guide

BMP to AVIF Conversion Guide

Why AVIF beats legacy formats and when to make the switch from BMP or ICO to modern AVIF.

Tool

⬇ Image Resizer

How It Works

Drop your ICO filesDrag one or more .ico files onto the drop zone, or click Browse Files. Thumbnails generate immediately using your browser's native ICO decoder.

Set quality and click ConvertThe Canvas API renders the ICO's highest-resolution frame and encodes it as AVIF. Adjust the quality slider (default 80) before converting.

Download your AVIFsDownload files individually or check "Download as ZIP" for a single timestamped archive. App resets after export.

🔒 Privacy & Security

All decoding and encoding runs entirely in your browser using the Canvas API. ICO files are never sent to any server — they stay in your browser's memory from load to download. This is important for proprietary brand assets and client icon files.

You Might Also Need

BMP to AVIF → HEIC to AVIF → TIFF to AVIF → HEIC to ICO → Image Resizer →

ICO vs AVIF: Format Comparison

Property	ICO	AVIF
Primary use	Windows icons, browser favicons	Web images, photography, UI assets
Typical dimensions	16×16 to 256×256 px	Any dimension
Compression	None (BMP) or lossless (PNG)	Highly efficient lossy or lossless
Transparency (alpha)	Full 32-bit RGBA	Full alpha channel support
Browser support	All browsers (favicon only)	Chrome 85+, Firefox 93+, Edge 121+
File size	Small (icon sizes)	Very small — best compression ratio
Multi-size in one file	Yes — multiple frames	No — single image per file
Best for	Favicons, Windows app icons	Web delivery, modern image display

Frequently Asked Questions

What is AVIF and why convert ICO to it?▼

AVIF (AV1 Image File Format) is a next-generation image format developed by the Alliance for Open Media. It offers better compression than JPEG, PNG, or WebP at equivalent visual quality. Converting ICO art to AVIF gives you a web-optimized image file suitable for any dimension and display context.

Which frame of the ICO is used for the AVIF?▼

The browser's native ICO decoder selects the highest-resolution frame when loading the file to a canvas element. For most modern ICO files this is the 256×256 PNG frame, which gives the best quality AVIF output.

Can I convert multiple files at once?▼

Yes — drop up to 25 or more files at once. The tool processes them in parallel batches, shows per-file status badges, and lets you download all AVIFs individually or as a single timestamped ZIP.

Does the AVIF support transparency?▼

Yes — AVIF supports full alpha channel transparency. If your ICO frames have transparent areas (common with icon art), those will be preserved in the AVIF output.

Is this tool free with no limits?▼

Yes — completely free with no file size limits, no per-conversion limits, and no account required. Processing happens in your browser so we never see your files.

What is the ZIP file named?▼

The ZIP is named dataconversioncenter_ico_to_avif_YYYYMMDDHHMM.zip using your local time — for example dataconversioncenter_ico_to_avif_202603061200.zip.