HEIC vs JPG: what iPhone photos really are and when to convert them

What HEIC is under the hood

HEIC is a container that usually holds images compressed with HEVC (H.265), the same codec used for 4K video. HEVC predicts blocks of pixels from neighbouring blocks far more cleverly than the 1992-era JPEG algorithm, which is why a 12-megapixel iPhone photo is often 1.5–2.5 MB as HEIC versus 3–5 MB as JPG.

The container can also hold extras that JPG cannot: depth maps for Portrait mode, multiple frames for Live Photos, 10-bit colour, and an alpha channel. When you convert to JPG, those extras are flattened into a single 8-bit image.

Where HEIC still fails

Support has improved, but HEIC is far from universal. In our own testing and from support emails we receive, these are the most common places it gets rejected:

• Visa, passport and university application portals that only accept JPG or PNG.
• Older versions of Windows without the paid HEVC extension installed.
• Many web forms, CMS platforms and online print services.
• Messaging tools on Android that show HEIC as a generic file attachment.

Does converting HEIC to JPG lose quality?

Technically yes, because JPG is a lossy format and you are re-encoding the image. In practice, at a quality setting of 85–92 the difference is invisible to the eye on screens and in prints up to A4. The file will be larger than the HEIC original — that's the price of compatibility.

If you need to edit the image repeatedly, convert to PNG instead. PNG is lossless, so repeated saving won't add artefacts, although files will be considerably bigger.

Privacy: the metadata problem

iPhone photos usually carry EXIF metadata including the exact GPS coordinates where the photo was taken, the device model and the timestamp. Many online converters upload your photo to their servers, where that data could be logged.

younisconvert decodes HEIC entirely inside your browser and re-draws the pixels onto a fresh canvas before encoding the JPG. The output therefore contains no GPS location or camera metadata, and the original never leaves your device.

Stop the problem at the source

If you constantly need JPG, you can change the iPhone default: Settings → Camera → Formats → Most Compatible. New photos will be captured as JPG. You can also set Settings → Photos → Transfer to Mac or PC → Automatic, which converts on export when connected by cable.