AVIF format explained: the smallest modern image format

What AVIF is

AVIF comes from the AV1 video codec. At the same visible quality it is typically 20–50 % smaller than WebP and half the size of JPG, with transparency and wide-gamut colour. Chrome, Firefox, Safari (16.4+) and Android 12+ open it.

Encoding is slow and decoders are still uneven outside browsers, which is why AVIF is best as a delivery format rather than a working format.

Use AVIF when

• Web images where bandwidth matters and the audience uses current browsers.
• Large photo sets that must be stored small and viewed on modern devices.

Avoid AVIF when

• Anything that must be edited later: few editors open AVIF, and ConvertX cannot read it back.
• Recipients on older phones, Windows without the AV1 extension, or office software.

How ConvertX handles AVIF

• Output only. Convert JPG, PNG, WebP, BMP, TIFF, GIF (and HEIC on Android) to AVIF; the app cannot open an AVIF file.
• Encoding uses the rav1e encoder bundled in the app and runs on the device; large batches take longer than WebP.
• AVIF does not carry EXIF in ConvertX; the "Keep photo details" toggle applies to JPG, PNG and WebP only.
• The compressor leaves AVIF out of its lossless mode (there is nothing to recompress) and does not accept AVIF input.

Extensions: .avif. Metadata: no EXIF is written by ConvertX.