Images

AVIF → ICO

Learn about the formats: What is AVIF? What is ICO?

Convert AVIF raster images to ICO format instantly. This tool is essential for web developers and designers needing website favicon files.

AVIF is a modern, highly compressed raster image format designed for web efficiency, while ICO is a traditional multi-resolution raster format required by browsers for favicons. During conversion from a lossy AVIF source, the previously compressed pixels cannot be fully restored to their original pristine state. Because ICO packages multiple sizes and uncompressed or lightly compressed color palettes into a single file, the resulting icon file size usually becomes larger than the input AVIF.

Since AVIF uses a compression algorithm that can discard data, any quality lost in the original source cannot be recovered during the conversion to ICO.

Tips

Prepare a square AVIF image before converting to avoid unwanted stretching in your ICO.
Keep in mind that your final ICO file size will typically be larger than the original AVIF.
Include multiple standard favicon dimensions (like 16x16 and 32x32 pixels) if your workflow allows.

Common use cases

Creating a website favicon from modern AVIF graphic assets.
Preparing application icons for Windows software deployment from web graphics.
Updating legacy browser shortcut icons using newly redesigned brand assets.

Why ConvertX stays free — forever

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Free tools today — and always

Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.

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Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.

File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

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Audio

Music, podcasts, voice recordings, and sound effects.

Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS

Advantages

+ FLAC and WAV preserve full quality for editing
+ MP3 and AAC are universally compatible
+ OPUS delivers great quality at low bitrates

Disadvantages

− Uncompressed WAV files are very large
− Lossy formats cannot be restored to original quality
− DRM-protected files may not convert

Frequently asked questions

No. AVIF is a raster format that often uses lossy compression. Converting to ICO cannot restore data that was already lost in the original AVIF file.

ICO is a specialized raster format that often stores multiple resolution layers and uncompressed data within a single file, making it larger than highly compressed AVIF sources.

While technically possible, ICO is specifically optimized for favicons and system icons, whereas AVIF is better suited for standard web photography.

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