HEIC or AVIF?
In a HEIC vs AVIF choice, where the image will be used matters most: HEIC is common for source photos, while AVIF is useful for websites and apps that support it.
The main difference
HEIC is a HEIF-based photo format commonly associated with HEVC compression and phone-camera workflows. AVIF also uses a HEIF-family container, but its image data is based on AV1.
Both can support modern image features, but compatibility depends on where the image is going.
HEIC vs AVIF at a glance
A practical comparison for choosing the file you actually need.
| Decision point | HEIC | AVIF |
|---|---|---|
| Common use | Original photos from phones and HEIF/HEVC-based image workflows. | Web and application images using AV1-based compression. |
| Compression family | Commonly HEVC-based inside HEIF. | AV1-based inside an AVIF container. |
| Transparency / HDR | Capabilities depend on the HEIF image structure and software support. | Supports alpha transparency, HDR, and wide color gamut. |
| When to choose it | Keep it when the source is HEIC and the next app accepts it. | Use it when the destination supports or asks for AVIF. |
File size and image quality
There is no fixed HEIC-to-AVIF size or quality ratio. Results depend on the source image, encoder, quality setting, and other options. If size matters, compare outputs made from the same source at settings that give acceptable visual quality.
Which should you use?
Keep HEIC when it already works in your photo library and apps. Use AVIF when you are preparing the image for a website or application that supports AVIF.
Do not convert just because AVIF is newer. Convert when the website or app you are using benefits from it.
Preview the HEIC image or create a JPG copy for sharing.
Why they feel similar but are not interchangeable
HEIC and AVIF are related at the container-family level, but they use different coding technologies and have different software ecosystems. A program that supports one does not automatically support the other.
Simple rule of thumb
For HEIC vs AVIF, keep HEIC as the original when it already works and use AVIF when the website or app calls for AVIF.
Related HEIC guides and tools
Choose the guide or tool that matches what you want to do next.
Convert a HEIC or HEIF photo to JPG for apps and sites that do not accept HEIC.
HEIC ViewerOpen HEIC or HEIF files in the browser without changing the original.
What is a HEIC file?Learn what HEIC is, why phones use it, and when you may want another format.
HEIC vs WebPCompare HEIC source photos with WebP images used on websites.
Frequently asked questions
Short answers to common comparison questions.
No. They are different image formats and commonly use different codecs.
No fixed ratio applies. File size depends on the image and encoding settings.
Only when the website or application you are using benefits from or requires AVIF.