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AVIF vs ICO

AVIF vs ICO

A detailed comparison of AVIF Image and ICO Icon — file size, quality, compatibility, and which format to choose for your workflow.

Convert AVIF → ICO Convert ICO → AVIF
AVIF

AVIF Image

Raster & Vector Images

AVIF is a next-generation image format based on the AV1 video codec. It offers significantly better compression than JPEG and WebP while maintaining excellent visual quality, including HDR and wide color gamut support.

About AVIF files
ICO

ICO Icon

Raster & Vector Images

ICO is the icon file format used for favicons and Windows application icons. A single ICO file can contain multiple image sizes and color depths for different display contexts.

About ICO files

Strengths Comparison

AVIF Strengths

  • Best-in-class compression efficiency — 30-50% smaller than JPEG for the same quality.
  • Royalty-free and patent-unencumbered (unlike HEIC).
  • Supports alpha transparency, HDR, wide gamut (BT.2020), and up to 12-bit color.
  • Progressive decoding: a blurry preview appears while the file is still downloading.
  • Supported in all major browsers since late 2022 — no polyfills needed.

ICO Strengths

  • Multi-resolution: one file, many sizes, OS picks the right one.
  • Universal favicon support in every browser since IE5.
  • Supports transparency (1-bit since 1985, full alpha since XP).
  • Tiny file size — an entire favicon pack typically fits in under 15 KB.
  • No licensing or patent concerns — fully in the public domain spec-wise.

Limitations

AVIF Limitations

  • Encoding is CPU-expensive — an AVIF export can take 10-30× longer than JPEG.
  • Older software (pre-2022) cannot open AVIF without plugins.
  • Email clients still largely ignore it — stick to JPEG for attachments.
  • Metadata support (EXIF, XMP) exists but tooling is less mature than for JPEG.

ICO Limitations

  • Cannot compress continuous-tone images efficiently — use PNG or WebP for photos.
  • Format is essentially frozen in 1999 — no HDR, no wide gamut, no modern features.
  • Maximum image dimension is 256×256 px (inside an ICO container).
  • Editing requires specialized tools — most image editors treat it as a curiosity.

Technical Specifications

Specification AVIF ICO
MIME type image/avif image/vnd.microsoft.icon
Container HEIF (ISOBMFF) —
Codec AV1 (intra-only) —
Max dimensions 65 536 × 65 536 px —
Color depth Up to 12-bit per channel —
Color spaces sRGB, Display-P3, BT.2020, arbitrary ICC —
Max resolutions per file — 65 535 images
Max single image size — 256×256 px
Color depths — 1, 4, 8, 24, 32 bits per pixel
Compression — Uncompressed bitmap or embedded PNG (Vista+)

Typical File Sizes

AVIF

  • Thumbnail (400px) 10-30 KB
  • Web photo (1920px) 80-300 KB
  • 4K photo (3840px) 300 KB - 1.2 MB
  • Lossless copy of 24MP photo 8-15 MB

ICO

  • Classic favicon (16×16 only) < 2 KB
  • Multi-size favicon pack (16/32/48/256) 5-15 KB
  • Full Windows app icon set 20-100 KB

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Frequently Asked Questions

AVIF (AV1 Image File Format) is a cutting-edge image format derived from the AV1 video codec, backed by the Alliance for Open Media. It delivers up to 50% smaller files than JPEG with equal or better visual quality, plus HDR and transparency support.

AVIF (AV1 Image formatoo de arquivo) is a cutting-edge image formato derived de the AV1 video codec, backed pelo Alliance para abrir Media. It delivers up to 50% smaller arquivos than JPEG com equal ou better visual quality, plus HDR e transparência support.

AVIF files open in Chrome, Firefox, Safari (from macOS Ventura), Edge, and GIMP 2.10+. Support is growing rapidly, but some older image editors may not yet handle AVIF natively.

AVIF arquivos abrir in Chrome, Firefox, Safari (from macOS Ventura), Edge, e GIMP 2.10+. Support is growing rapidly, mas some older image editors may not yet handle AVIF natively.

AVIF provides better compression and quality than WebP, especially for photographs. However, WebP has broader software support today. Use AVIF for maximum performance on modern browsers and WebP as a reliable fallback.

AVIF fornece better compressão e quality than WebP, especially para photographs. Porém, WebP has broader software support today. usar AVIF para máximo performance on moderno browsers e WebP como um reliable fallback.