How to Convert JPG to AVIF on iPhone
JPG is the universal language of digital photos. It's also the least efficient modern format. If you have JPG photos in your iPhone library — old imports, downloads, photos from a friend's Android, scans, web saves — they're almost certainly the biggest single source of wasted storage on your phone.
Converting JPG to AVIF reclaims up to 70% of the space without losing visible quality.
Where Do the JPGs Even Come From?
Most iPhones save photos as HEIC by default, so you might wonder how JPGs sneak in. Common sources:
- AirDrops from older devices.
- WhatsApp, Telegram, and email attachments.
- Photos imported from a DSLR or older camera.
- Photos imported from an Android phone.
- Web downloads, screenshots from a browser.
- Photos saved before you upgraded to iOS 11.
Once a JPG is in your library, it sits there at whatever size it was saved — often 2-5 MB per photo, sometimes more, because JPG is wildly inefficient by modern standards.
Why AVIF Is the Right Target
At the same visible quality, AVIF photos are typically:
- 50-70% smaller than JPG
- 20-40% smaller than HEIC
For a single 4 MB JPG, that's an AVIF in the 1.2-1.6 MB range. Across hundreds of JPGs in your library, the savings are real.
Can iPhone Convert JPG to AVIF on Its Own?
No. iPhone has no built-in "Save as AVIF" option. It can open AVIF photos perfectly but not create them. To convert, you need a third-party tool.
The Easiest Way: HEVCut
HEVCut converts JPG, HEIC, and PNG to AVIF on your phone. Nothing uploads.
- Open HEVCut and tap the Photos tab.
- Tap the gear icon to open Compression Settings.
- Set Output Format to AVIF.
- Filter your library by JPG to target only the JPGs.
- Tap Compress.
The AVIF files replace the JPG originals in Photos, iCloud syncs the smaller copies everywhere, and the JPG originals stay in Recently Deleted for 30 days.
Convert iPhone JPG photos to AVIF on-device. No upload. Try HEVCut free.
Try freeWhat to Expect: Real Numbers
A typical JPG-heavy library converted to AVIF:
| Original JPG | Type | Result |
|---|---|---|
| 4.2 MB | Daylight landscape | 1.4 MB (67% smaller) |
| 3.8 MB | Portrait | 1.3 MB (66% smaller) |
| 5.0 MB | Low light | 2.0 MB (60% smaller) |
| 1.4 MB | Screenshot | 0.4 MB (71% smaller) |
| 0.6 MB | Logo / line art | 0.1 MB (83% smaller) |
If you have 1,000 JPG photos averaging 3.5 MB each (3.5 GB), expect to land near 1.2 GB after AVIF conversion. Multiply that across an iPhone library that's been collecting JPGs for years and the gains are substantial.
Will Quality Drop?
No, not visibly. AVIF uses smarter compression than JPG, so it can produce a much smaller file at the same perceived quality. In side-by-side viewing on an iPhone screen, you cannot tell a converted AVIF apart from the original JPG.
In fact, in places where JPG visibly fails — banding in skies, fuzzy text, halos around sharp edges — AVIF often looks cleaner than the original.
Will Metadata Survive?
Yes. Date, location, camera info, and album membership all carry through. Photos search and Memories keep working exactly as before.
What About Sharing?
After conversion:
- iMessage, WhatsApp, Telegram, Signal: Modern versions handle AVIF directly.
- Instagram, TikTok, Facebook: All accept AVIF uploads.
- Email: Most modern clients display AVIF inline. For older recipients, send a JPG export instead.
- Printing: Most print services still require JPG — convert back to JPG just before printing if needed.
Common Questions
What if I have a mix of JPG and HEIC photos?
HEVCut converts both at once. Pick AVIF as the output format and let it sweep both source formats in a single pass. The HEIC→AVIF savings are smaller (20-40%) than JPG→AVIF (50-70%) but stack into the same total.
Are my JPG originals deleted?
They move to Photos' Recently Deleted album for 30 days. For permanent backup, stash originals in HEVCut's Personal Vault before converting.
Does this work offline?
Yes. The conversion runs entirely on your phone. No internet required.
Will my JPG-loving Windows aunt still see the photos?
Yes, on Windows 11. For older Windows (7/8) or other legacy systems, share an exported JPG. AVIF works for the receiver almost everywhere but isn't universal yet.
Bottom Line
JPGs are the lowest-hanging fruit in any iPhone library. Converting them to AVIF can reclaim 60-70% of the storage they currently use without changing how the photos look. With HEVCut, the whole job runs on-device in the background. If you're staring at a "Storage Full" warning and you have years of JPG imports sitting around, this is the fastest place to win.