Are my HEIF files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.

Is converting HEIF to AVIF free?

Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.

Does converting HEIF to AVIF lose quality?

AVIF is a compressed format, so some data is discarded. At the default setting the difference is not visible; you can raise the quality setting if you need to be certain.

Do I need to install anything to open AVIF files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the AVIF afterwards needs whatever software normally handles AV1 Image File Format on your device.

HEIFtoAVIF

Convert HEIF to AVIF

Up to 3 files at once, 100 with Pro. Mixed formats are fine.

You can convert HEIF to AVIF free and without an account: drop the file above and the AVIF is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What HEIF and AVIF are for

The container standard behind HEIC. Same efficiency, same compatibility problems.

The most efficient web image format today. Smaller than WebP, slower to encode.

How to convert HEIF to AVIF

Drop your HEIF file onto this page, or click to pick one.
Choose AVIF as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished AVIF file.

HEIF vs AVIF: what changes

HEIF compared with AVIF
	HEIF	AVIF
Full name	High Efficiency Image File Format	AV1 Image File Format
File extension	.heif	.avif
Media type	image/heif	image/avif
Compression	Lossy — file size is bought with quality	Either, depending on the setting

Quality: Some quality is given up for a smaller file. At the default setting the difference is hard to see.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.

HEIF to AVIF: common questions

Are my HEIF files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and watch that nothing is sent while the file converts.
Is converting HEIF to AVIF free?: Yes, without a limit on how many files you convert and with no watermark on the result. Files up to 100 MB are covered by the free plan.
Does converting HEIF to AVIF lose quality?: AVIF is a compressed format, so some data is discarded. At the default setting the difference is not visible; you can raise the quality setting if you need to be certain.
Do I need to install anything to open AVIF files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the AVIF afterwards needs whatever software normally handles AV1 Image File Format on your device.