When you save a photo on your iPhone, it often comes out as a HEIC file. AVIF is another modern format built for the web. The short answer: if you need to share the photo with someone who uses an older app or upload form, compatibility matters more than the latest compression. This post walks through the practical differences between HEIC and AVIF, and when to stick with a more universal format like JPG or PNG.
HEIC and AVIF: Where Each Format Fits
HEIC is closely associated with Apple photo workflows. Recent iPhones use it because it can store high-quality photos efficiently, saving storage space without sacrificing detail. AVIF is designed for efficient web images, offering strong compression for use on websites and in browsers. Both formats are newer than JPG, but they serve different primary audiences: HEIC for device storage and sharing within Apple ecosystems, AVIF for web delivery. Before you decide which to use, check the format support in the intended app or upload form. Some older apps and upload forms still reject HEIC, and AVIF support, while growing, is not universal.
The Compatibility Rule: Test Before You Trust
No matter how efficient a format is, if the recipient cannot open it, the compression is wasted. Here is a practical rule: keep the original HEIC until the converted copy has been checked. That way, if the conversion fails or the app does not support the format, you still have the original.
- JPG is the usual compatibility choice. Almost every app, upload form, and device can open it. The trade-off is that JPG uses lossy compression, so each save can reduce quality slightly.
- PNG is useful when a lossless editing copy is preferred. It preserves every pixel, making it ideal for editing workflows. The file size is larger than HEIC or AVIF, but you can edit and re-save without quality loss.
If you are sending photos to a client, a social media upload, or a government form, convert to JPG first. If you are editing and plan to make further changes, keep a PNG copy alongside the original HEIC.
When to Keep HEIC and When to Convert
HEIC is commonly used by recent iPhones because it can store high-quality photos efficiently. If you are working within Apple’s ecosystem, HEIC works well. But if you need to share with someone using Windows, Linux, or an older phone, you will likely need to convert.
Scenarios for Keeping HEIC
- You are archiving photos for your own use and your software supports HEIC.
- You are sharing with other Apple users who have recent devices.
- You want to save storage space on your phone or computer while keeping high quality.
Scenarios for Converting to JPG or PNG
- You are uploading to a web form that does not accept HEIC.
- You are emailing someone who may not have HEIC support.
- You are editing the photo and want a lossless copy (use PNG).
If you need to convert HEIC files quickly, a free HEIC converter like HEIC.now can handle the job without requiring you to sign up or install software. It converts iPhone HEIC photos to JPG, PNG, PDF, WebP and other supported formats, and can also convert JPG and PNG images to HEIC. It includes HEIC compression, so you can reduce file sizes if needed.
AVIF for Web Images: Pros and Limits
AVIF is designed for efficient web images, meaning it can produce smaller file sizes than JPG while maintaining similar visual quality. This makes it attractive for websites that want to load faster. However, AVIF support is still rolling out. Many older browsers, image editors, and upload forms do not recognize AVIF files. If you are building a website, you can use AVIF for images that will be viewed in modern browsers, but you should also provide a fallback format like JPG for older browsers. For personal photo storage, HEIC is more common because of its association with iPhone cameras. AVIF is not yet a standard output format for phone cameras, so you would need to convert from HEIC or another source to get AVIF files.
A Practical Workflow for Photo Storage and Sharing
- Keep the original HEIC from your iPhone. It is the highest quality source and takes less space than an uncompressed format.
- Check the destination. Does the app, upload form, or recipient support HEIC? If not, decide whether you need lossless editing (PNG) or broad compatibility (JPG).
- Convert a copy. Use a tool like HEIC.now to convert HEIC to JPG or PNG. Keep the original until you verify the converted copy opens correctly.
- For web use, consider AVIF if you know your audience uses modern browsers. Otherwise, JPG remains the safest choice.
- Delete the original only after you have confirmed the converted file works and you no longer need the original for further edits.
This workflow prevents data loss and ensures you always have a fallback. The key is not to delete the HEIC until you have tested the converted copy in the actual app or upload form where it will be used.
Bottom Line: Compatibility Before Compression
HEIC and AVIF both offer better compression than JPG, but compression is useless if the file cannot be opened. For photos taken on an iPhone, HEIC is the native format, and it is efficient. For sharing with the widest audience, convert to JPG. For editing, use PNG. AVIF is a promising web format, but its support is not yet universal. Always check format support in the intended app or upload form before you commit to a format. A few minutes of testing can save you from having to re-shoot or re-edit a photo.
Authoritative Reference
For Apple's explanation of HEIF media and device compatibility, see Apple's HEIF and HEVC guidance.