Does converting HEIC to JPG reduce quality?

Why there is some loss

Both HEIC and JPG discard information the eye is unlikely to miss. Your iPhone did that once when it saved the HEIC. Converting to JPG decodes that photo to pixels and compresses them again with a different method. Each lossy step can remove a little more fine detail or introduce faint artefacts, especially around sharp edges and in smooth gradients.

How much does it matter?

• At 90–92% quality, differences are hard to spot on a screen or in prints of normal size.
• At 100%, the file gets much larger without a visible improvement.
• Below about 75%, artefacts start to show when you zoom in.
• Colour depth is limited to 8 bits per channel in JPG. This matters mostly if you plan heavy editing of HDR photos.

Other things that change, besides sharpness

• File size usually increases, because HEIC is more efficient.
• Metadata such as camera details and GPS location is not carried over by this converter.
• Live Photo motion and depth data are not included – you get a still image.

How to check for yourself

1. Convert one photo at 92% quality.
2. Open the original and the JPG at 100% zoom, side by side.
3. Compare an area with fine detail – hair, foliage, text – and a smooth area such as sky.

If you cannot tell the difference, the setting is fine for that kind of photo.

How to lose as little as possible

• Convert from the original HEIC, not from a copy that was already compressed by a messaging app.
• Convert once, and keep working from that file rather than converting again and again.
• For editing, choose [PNG](/heic-to-png) so later saves lose nothing more.
• Keep the HEIC original as your master copy.