Why iPhone photos need converting
iPhones store photos as HEIC by default to save space, but many websites, forms, and Windows tools want JPEG. Screenshots come out as PNG, which is larger than necessary when you only need to share a picture.
Rather than hunting for a converter app, you can change the format in the browser you already use.
Windows and many web forms are the usual culprits behind the rush to convert. A colleague on a PC may see a blank thumbnail where your iPhone shows a perfect photo, which is almost always the HEIC issue rather than a broken file.
Set the camera to JPEG once
If you want every new photo to be JPEG, open Settings, then Camera, then Formats, and choose Most Compatible. New shots will be saved as JPEG. Existing HEIC photos stay as they are.
For a standalone JPEG from a HEIC file, export it through the Files app or share sheet first. The image converter itself takes JPEG, PNG, and WebP; HEIC photos open directly only in Images to PDF, which outputs a document rather than an image.
The same Settings screen is worth checking on an iPad if you take photos there. The option applies per device, so tablets keep their own default.
Converting in Safari, no app needed
Filekind runs entirely on the phone. The image is not sent to a server, and there is no signup or watermark.
If Safari asks for permission to access photos, allow it for the page so the picker can load your library. You can also save the image to Files first and select it from there.
- Open Safari on your iPhone and load the JPG to PNG converter.
- Tap to select the photo from your library or Files.
- Confirm PNG is the output format and generate the file.
- Download the result and save it to Photos or Files.
- Attach or upload the new PNG wherever you need it.
Other conversions you can do the same way
PNG to JPG turns a screenshot into a smaller photo file that emails and forms accept more readily; transparent areas become white. WebP to JPG opens files that other iPhone apps refuse. JPG to WebP and PNG to WebP prepare assets if you also maintain a website.
If a photo needs to be smaller rather than a different format, compress it to a KB target. If the pixel size is wrong, resize with the aspect ratio lock on.
Screenshots are the easiest win. A full-screen PNG can be several megabytes; converting to JPG before attaching it to a message or form usually cuts that down without visible loss at phone sizes.
- Use the Files app to find screenshots and downloads if the photo is not in your library.
- Keep originals; convert copies when you are experimenting.
- Large files above 25 MB or images over 16,000 pixels per side are rejected before processing.