Free HEIC to AVIF Converter (No Upload, Local Processing)
Published: September 2, 2026 · 5 min read
If you take photos on your iPhone, they're saved as HEIC files by default. That's great for saving storage on your phone, but HEIC doesn't work on the web: most browsers and platforms can't display it, so you have to convert it before uploading to your store. Most people convert HEIC to JPG, but AVIF is even better: it's 50% smaller than JPG at the same quality, which makes your product pages load faster. Our free HEIC to AVIF converter does this entirely in your browser.
Why AVIF Beats JPG and WebP
| Format | File size (same quality) | Browser support |
|---|---|---|
| JPG | 100% (baseline) | 100% |
| WebP | 70% of JPG | 97% |
| AVIF | 50% of JPG | 92% (Chrome, Firefox, Edge, Safari 16+) |
Step-by-Step Conversion
- Upload your iPhone HEIC photos (you can select multiple at once).
- Our tool reads the HEIC file directly in your browser, no upload to any server.
- Set quality to 80% — that's the sweet spot where you can't tell the difference from the original, but file size is cut in half.
- Click convert, then download all AVIF files as a ZIP.
When to Use AVIF (and When Not To)
- Use AVIF on your own store: Shopify, WooCommerce, and your own blog all support AVIF. Smaller files = faster pages = better Google ranking.
- Don't use AVIF on Amazon/Etsy/eBay: These marketplaces don't accept AVIF. Use JPG for marketplace listings, and AVIF for your own store.
- AVIF is perfect for hero images: Your main hero banner is the heaviest image on your page. Converting it to AVIF cuts its size by 50%, which gives you the biggest speed win.
- Keep both versions: Keep a JPG version of every photo for marketplace uploads, and an AVIF version for your own site.
Common Mistakes
- Converting every photo to AVIF: Photos under 100KB don't need conversion. Focus on your hero images and main product photos — those are the big files that slow down your page.
- Setting AVIF quality too low: Below 70% quality, skin tones and product colors start to look banded. Stick to 75-85%.
- Forgetting to test on mobile: After uploading AVIF to your store, test on an actual Android and iPhone to make sure the images load correctly. Most modern devices support it, but it's worth checking.
- Uploading HEIC directly to your store: Most e-commerce platforms don't support HEIC. Always convert HEIC to a web-friendly format (AVIF/WebP/JPG) before uploading.
Why your iPhone saves photos as HEIC in the first place
If you've ever tried to AirDrop a photo to a Windows PC or upload it to an e-commerce platform, you've run into HEIC. Apple switched to HEIC as the default photo format in 2017, and for good reason: HEIC files are about half the size of equivalent JPGs, without any visible quality loss. That means you can fit twice as many photos on your 128GB iPhone, and each backup to iCloud takes half as long. It's a great format for storing photos on your phone. It's a terrible format for the web, because no major marketplace or older browser supports it. That's why conversion is a mandatory step for anyone who shoots product photos on their iPhone and sells online.
The classic pain point for small sellers: you take 20 product photos on your iPhone, plug your phone into your computer, drag the photos into your Shopify upload folder, and get a bunch of "unsupported file" errors. You can't upload them directly. You could open each photo in Preview on Mac and export as JPG, but that's 20 separate export clicks. Or you could use a cloud converter, but that means uploading your unreleased product photos to a random server. Our local converter lets you drop all 20 HEIC files in at once, convert them all to AVIF in your browser, and download them as a zip — no upload, no account, no clicking through 20 export dialogs.
How much speed gain do you actually get from AVIF?
Let's run a real example. A typical product hero photo, straight from an iPhone, is about 3MB as a HEIC file. If you convert that to JPG, it comes out around 2MB. If you convert it to AVIF at quality 80, it comes out around 1MB. That's half the size of the JPG, at visually identical quality. On a slow 4G connection, that 1MB difference is the difference between your hero image loading in 1 second vs 2.5 seconds. Google measures that as your LCP (Largest Contentful Paint), and it's one of the three Core Web Vitals that directly affects your search ranking. Getting your LCP under 2 seconds moves your site from "needs improvement" to "good," which can translate to a noticeable ranking boost over time. It's not a one-time win, either — every visitor to your site loads that faster, and the cumulative effect across thousands of visitors is a lower bounce rate and higher conversion.
AVIF support crossed the 92% browser support threshold in 2024, which means it's safe to use on public-facing sites. The remaining 8% of users on very old browsers automatically get a JPG fallback, which Shopify, WooCommerce, and most modern site builders handle automatically with a picture element. You don't have to do any extra work to support both formats — the site serves the right one based on what the visitor's browser can handle.
Privacy: why local HEIC conversion matters
Most online HEIC converters work by uploading your photo to their server, converting it there, and sending the result back. That means your product photos, personal snapshots, or client work are sitting on someone else's server. For sellers about to launch a new product line, that's a real leak risk — your unreleased photos could be scraped or accessed before you're ready to go live. Local conversion means the HEIC file is decoded entirely in your browser, on your own computer. The photo never leaves your hard drive, there's no upload step, and no third party ever sees your files. You can even disconnect from the internet after the page loads, and the conversion still works — that's how fully local processing is.
It's also faster. Cloud converters require you to upload the 3MB HEIC file, wait for the server to process it, then download the 1MB AVIF. On a slow connection, that's 10-15 seconds per image. Local conversion reads the file straight from your disk, processes it in your browser, and gives you the download in about 1 second. For batches of 20+ images, that difference adds up to minutes saved per product shoot.
There's no downside to local conversion, either. The AVIF output quality is identical to what you'd get from a cloud converter, because it's the same AVIF encoder running on your hardware instead of a server. The only difference is where the processing happens — and keeping it on your machine is strictly better for privacy, speed, and reliability. No account, no watermark, no upload waiting, just drop your HEIC files in and get AVIF files out in seconds.