If you've ever AirDropped or emailed a photo from an iPhone to a Windows laptop and gotten a broken thumbnail or an "unsupported file" error, you've run into HEIC. It's not a bug — it's Apple's default photo format since iOS 11, and it trips up more people than you'd expect.
What HEIC actually is
HEIC (High Efficiency Image Container) stores photos using a compression method that produces smaller files than JPG at a similar visual quality. For Apple, that means more photos fit on your iPhone's storage without a visible quality hit. The trade-off is compatibility: HEIC is a newer format, and a lot of software — especially older Windows systems, most Android phones, many web forms, and plenty of apps — simply doesn't know how to open it.
Where this becomes a real problem
- Uploading a photo to a job application or admission portal that only accepts JPG or PNG
- Sending a photo to a friend with an Android phone or an older Windows PC
- Uploading to a website or CMS that rejects HEIC outright
- Archiving photos in a format you know will still open in 10 years
The fix: convert HEIC to JPG, without losing your photos to a random app
You don't need to install desktop software or trust some random app with access to your photo library just to convert a file format. Tools like SNTools' HEIC to JPG Converter run the entire conversion inside your browser, using WebAssembly to decode the HEIC file locally — meaning your photo is never uploaded to a server. You get a JPG back in seconds, and nothing about the process touches the internet beyond loading the page itself.
Tips for a clean conversion
- Keep the output quality above 85% if the photo will be printed or used professionally.
- Batch-convert multiple photos at once instead of doing them one by one — most decent converters support this.
- If you're archiving old photos, convert in bulk and store both formats if storage space allows.
FAQ
Can I change my iPhone to save photos as JPG instead of HEIC?
Yes — in Settings → Camera → Formats, choosing "Most Compatible" saves new photos as JPG automatically. This doesn't fix photos you've already taken, though.
Does converting to JPG lose quality?
There's a small trade-off since JPG compresses differently than HEIC, but at high quality settings it's rarely noticeable.
Try it yourself, free
Convert HEIC to JPG in your browser — free, no sign-up, nothing uploaded.