Quick answer
On an iPhone running iOS 26, open the HEIC image in Preview, tap the Actions Menu beside the filename, choose Export, select JPEG, adjust the file-size slider if needed, and save the new copy. The original HEIC file stays unchanged unless you deliberately replace or delete it.
Convert an existing HEIC photo with Preview
Apple's Preview app on iOS 26 can export images as HEIC, JPEG, PDF, PNG, or TIFF. That makes it the most direct built-in method when you need a standard JPG copy for a form, website, email attachment, or device that does not accept HEIC.
- Open the Preview app on your iPhone.
- Open the HEIC image you want to convert. If the photo is currently in Photos, first share or save a copy where Preview can open it.
- Tap the Actions Menu button beside the filename.
- Tap Export, then choose JPEG.
- Move the file-size slider if you want a smaller file, then save the exported image.
Convert in Safari without uploading to WebToolDock
The WebToolDock Image to JPG Converter processes a selected image in the current browser tab. It lets you choose JPG quality and the background color used for transparent pixels.
Compatibility note: the converter can only process formats that the current Safari version can decode. If Safari rejects a particular HEIC file, use Preview's JPEG export instead.
Open Image to JPG ConverterMake future iPhone photos save as JPEG
If another service regularly rejects HEIC images, you can change the capture format for new photos:
- Open Settings.
- Tap Camera, then Formats.
- Select Most Compatible.
New photos will use JPEG and new videos will use H.264. Apple recommends the High Efficiency option when compatibility is not a problem because HEIF and HEVC generally use less storage while preserving comparable visual quality. Changing this setting does not convert photos already in your library.
Which method should you use?
| Situation | Best method |
|---|---|
| You have iOS 26 and need one reliable JPG copy | Export the image as JPEG in Preview. |
| You want quality and background controls | Try the WebToolDock browser converter if Safari can decode the source. |
| You need every future camera photo to be broadly compatible | Choose Camera → Formats → Most Compatible. |
| You want smaller source files and the destination accepts HEIC | Keep High Efficiency and do not convert unnecessarily. |
Why does an HEIC conversion sometimes fail?
The browser cannot decode the file
Browser support and the exact encoding used by the image can differ. A file may open in Photos or Preview but fail inside a web converter. Use Preview for that file rather than repeatedly uploading it elsewhere.
The JPG is larger than the HEIC original
That is normal. HEIF is designed for efficient compression, while JPEG may need more space for similar visible quality. Reduce the JPG quality slightly or use the Reduce Image Size in KB tool after conversion.
Transparent areas changed to white
JPEG does not support transparency. A converter must replace transparent pixels with a solid color. Choose the desired background before converting.
Sources and version notes
This guide was checked on August 23, 2026. Menu names can differ on older iOS releases.