Question 1

Why does iPhone use HEIC instead of JPG?

Accepted Answer

HEIC (High Efficiency Image Container) compresses ~50% smaller than JPG at the same visual quality. Apple switched the default in iOS 11 (2017) to save storage. The downside: Windows, older Android, and many web services don't support it natively.

Question 2

Are my photos uploaded to a server?

Accepted Answer

No. Conversion runs 100% in your browser using WebAssembly. Your photos never leave your device — important for personal pictures, ID scans, or anything sensitive. You can verify by disconnecting your internet after the page loads; conversion still works.

Question 3

Should I pick JPG or PNG output?

Accepted Answer

JPG for photos — smaller files, universal support, perfect for camera shots. PNG for screenshots, graphics with text, or images needing transparency — but file sizes are 3–5× larger. iPhone camera output is always lossy, so converting to JPG loses no real quality.

Question 4

Why can't I convert JPG back to HEIC here?

Accepted Answer

HEIC encoding is patent-licensed and not freely available in browser libraries. Decoding (reading) is solved; encoding (writing) requires Apple's proprietary encoder or a paid license. Practically, JPG→HEIC also gives no benefit — the JPG already lost the data HEIC could have preserved.

Question 5

Can I convert many photos at once?

Accepted Answer

Yes — drag in a batch and they process one after another. Total time depends on your CPU; expect 1–3 seconds per photo on a modern machine. Very large batches (500+ photos) may slow your browser; processing 50 at a time and saving as a ZIP is more reliable.

HEIC to JPG/PNG Converter

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