Image
AV1 Image File Format is a image format commonly identified by .avif. Use the listed signatures, MIME types, and structure notes to validate files beyond the extension.
66 74 79 70 ftypSIGNATURE = bytes.fromhex("66747970")
OFFSET = 4
def is_avif(path: str) -> bool:
with open(path, "rb") as f:
f.seek(OFFSET)
head = f.read(len(SIGNATURE))
return head == SIGNATUREconst SIGNATURE = [0x66, 0x74, 0x79, 0x70];
const OFFSET = 4;
// bytes: a Uint8Array / Buffer holding the start of the file
export function isAvif(bytes) {
return SIGNATURE.every((byte, i) => bytes[OFFSET + i] === byte);
}package fileid
import "bytes"
var isavifSignature = []byte{0x66, 0x74, 0x79, 0x70}
const isavifOffset = 4
func IsAvif(b []byte) bool {
end := isavifOffset + len(isavifSignature)
if len(b) < end {
return false
}
return bytes.Equal(b[isavifOffset:end], isavifSignature)
}const SIGNATURE: &[u8] = &[0x66, 0x74, 0x79, 0x70];
const OFFSET: usize = 4;
fn is_avif(bytes: &[u8]) -> bool {
bytes.get(OFFSET..OFFSET + SIGNATURE.len()) == Some(SIGNATURE)
}<?php
$signature = "\x66\x74\x79\x70";
$offset = 4;
function is_avif(string $bytes): bool {
global $signature, $offset;
return substr($bytes, $offset, strlen($signature)) === $signature;
}AV1 Image File Format is commonly used for image previews, thumbnails, metadata checks, and upload validation. Test multiple sizes because resolution, alpha support, compression, and file size often affect implementation behavior.
Media files can still stress decoders through corrupt metadata, extreme dimensions, long durations, or unusual chunks. Read size, dimensions, and duration before processing.
11 samples help test tiny images, high-resolution images, alpha channels, and hard-to-compress assets.
Blue Sky AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 96 x 72. It can be used to test downloads, parsers, previews, and file type detection.
01-blue-sky.avif8a0a2757408cae6bdb999ded923210cb2e03050e4c493c82ab00329cd287724f
Flower Garden AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 160 x 90. It can be used to test downloads, parsers, previews, and file type detection.
02-flower-garden.avif63ca2ed1b3b5affa91a5a29da9dcf6e68e2fd49b06ce9172a23c9ce37e9ca122
Navy Blue Sky AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 256 x 128. It can be used to test downloads, parsers, previews, and file type detection.
03-navy-blue-sky.avif2a063d12422e346f9b14c0e120aec94c55b85427af018385d1f8f5a8a742b60a
Nature of the Sky AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 360 x 270. It can be used to test downloads, parsers, previews, and file type detection.
04-nature-sky.avifbe183d737210b98ff1851872fafabdfddf06f994f10d6f903cc270c87db169d4
Sky Landscape AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 512 x 384. It can be used to test downloads, parsers, previews, and file type detection.
05-sky-landscape.avif3ecf61a6fa1ad8b0cfd36023c3f7b4e74cdd9cc596afd12c922d492ab62a05cb
Starry Sky AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 720 x 480. It can be used to test downloads, parsers, previews, and file type detection.
06-starry-sky.avife98d7442eb39abc4ec72980c7a9990678cb92dcab5400bff1d61332fd9d04d33
Blue Night Sky AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 960 x 640. It can be used to test downloads, parsers, previews, and file type detection.
07-blue-night-sky.avife2864c1530e5df65cb90bafd61a44d58e945d711807ad2e5ff297d3e0c8964e3
Hibiscus Flower AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 591 x 1280. It can be used to test downloads, parsers, previews, and file type detection.
08-hibiscus-flower.avif6d091d0f9cd9cb575f5a86be0bb896ede82bd0208cb0d4bd2ea500c46fe58203
Arctic Sky AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 1600 x 1063. It can be used to test downloads, parsers, previews, and file type detection.
09-arctic-sky.avifde02099cae1fc520cbc3e76732e73b487bfa9f736ef6d723e6a1d73f1ecc7da2
Sunset Rays AVIF is a AV1 Image File Format sample based on Wikimedia Commons, 720 x 515. It can be used to test downloads, parsers, previews, and file type detection.
10-sunset-rays.avifeca0c5c016d0982ddaa50436ca13f71259dc6f8c1af9846647dd730be9f0bf6c
NASA Blue Marble AVIF is a AV1 Image File Format sample based on NASA Image and Video Library, 640 x 640. It can be used to test downloads, parsers, previews, and file type detection.
nasa-blue-marble-2012-east.avif99babdbefe84976c0c8c5ceae8bebc51d91e050179c334dde30583453bfbe22eAV1 Image File Format files begin with the byte signature 66 74 79 70 ("ftyp"). Detect the format by reading these leading bytes rather than trusting the file extension alone.
The MIME type for AV1 Image File Format is image/avif.
AV1 Image File Format files use the .avif extension. The extension is a convention only and does not guarantee the file contents, so combine it with signature and structure checks.
