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HEIF to AVIF Converter

Turn HEIF files into AVIF in a couple of clicks. HEIF is the container standard HEIC is built on; AVIF is a next-gen format with the best compression available today. Some detail is discarded to fit the target format; how much depends on the format and your settings.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

HEIF files (.heif, .hif) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a HEIF file above and FileTools360 will turn it into AVIF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

  1. 1

    Add your HEIF files

    Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.

  2. 2

    Adjust the settings if you want to

    The defaults suit most people. Open Advanced to control quality and metadata removal.

  3. 3

    Convert and download

    Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

Privacy, in plain words

Is it safe? Your HEIF file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your HEIF file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

Photographs carry more than what is in the frame — most also carry the time, the device and often the GPS coordinates where they were taken. It matters more than it sounds, because of what images usually are:

Passport and visa photos

biometric-grade images of your face

Screenshots of private messages

conversations that included other people

Photos of ID cards and licences

the usual way people send identity documents

Screenshots of bank transfers

account details, and proof of what you paid whom

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

HEIF and AVIF explained

HEIF is the underlying container standard that HEIC is a specific profile of. The distinction matters mainly to developers: HEIF describes the box structure, while HEIC specifies HEVC-compressed contents inside it.

AVIF stores still images using the AV1 video codec's intra-frame compression. It generally achieves the smallest files of any widely supported format, and it handles wide colour gamut and HDR, which JPEG cannot.

Where HEIF files come from
Newer cameras and some Android devices, alongside Apple's HEIC.
Where AVIF is used
Performance-focused websites and modern image pipelines.

HEIF vs AVIF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

HEIF compared with AVIF
PropertySourceTarget
CompressionLossyLossy or lossless
TransparencyYesYes
AnimationYesYes
Introduced20152019
Browser supportLimited outside Apple and newer Android.Modern browsers only. Limited desktop app support.
HEIF is stronger at
Efficient modern compression. Flexible container that can hold image sequences and metadata.
AVIF is stronger at
The best compression of any broadly supported image format. Handles HDR and wide colour gamut. Supports transparency and animation.

Why convert HEIF to AVIF?

People make this switch when they run into the limits of HEIF: you need to share the file with anyone. AVIF is the better fit when you control the audience (a modern website) and file size is the priority.

HEIF limitations that prompt the switch
Support outside Apple and recent Android is limited. Confusing overlap with HEIC in practice.
What you give up
Encoding is slow compared with JPEG or WebP. Desktop application support is still thin.

Does converting HEIF to AVIF reduce quality?

AVIF compresses without discarding data, but it cannot represent everything an HEIF file holds. What does not fit is discarded permanently, so converting the result back will not restore it. Keep the HEIF original if it is the only copy.

About these formats

Source

High Efficiency Image Format

The container standard HEIC is built on.

Extensions
.heif, .hif
MIME type
image/heif
Best for
Modern cameras · Efficient photo storage
Compatibility
Limited outside Apple and newer Android.

Target

AV1 Image File Format

Next-gen format with the best compression available today.

Extensions
.avif
MIME type
image/avif
Best for
Smallest web images · HDR and wide gamut · Photography
Compatibility
Modern browsers only. Limited desktop app support.

Good to know

HEIF to AVIF Converter — questions

How do I convert HEIF to AVIF?

Drop your HEIF file onto the area above, then press Convert. The AVIF file saves straight to your device. You do not need an account, and there is no watermark.

Is it safe to convert HEIF files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your HEIF file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential HEIF files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

Does converting to AVIF reduce quality?

AVIF uses lossy compression, so some data is discarded. At the default quality the difference is very hard to see or hear; raise the quality setting if you need to be certain, at the cost of a larger file.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large images may run out of memory on a phone — those are better converted on a laptop.

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