Hi Lorena,

Sometimes you encounter Unknown JPEG format error when you try to open a JPEG image file. For common people, this error is just a loss of some memories, but for a professional photographer or graphic designers, this error may come with the loss of their business as they lose the accessibility of some of their very crucial photos. However, the main reason of encountering this error message is damage or corruption of JPEG image file.

Main causes of JPEG image file corruption:

• Generation of bad sectors in the hard disk sometimes corrupts the stored JPEG files, and you encounter the above-mentioned error message when you try to open a JPEG image file
• Virus infected storage media also corrupts JPEG image files, and you become unable to access them
• Corrupt or broken header of JPEG image file
• Due to incomplete JPEG scan, we also end up corrupting our valuable pictures
• Using the digital camera even after it indicates low battery also corrupts the clicked JPEG images and thus, you encounter the above error message when you try to view these images

However, Stellar Repair for Photo software available to repair your corrupt jpeg file(s) which not only repair your corrupt JPEG files but also extract and repair their thumbnails if you want.

1. Add corrupt JPEG File with "Add File" option which you wants to fix.
2. Select the corrupted JPEG File(s).
3. Repair the selected JPEG/JPG image files by using "Repair" option.
4. As soon as you choose this option a screen which helps to see the preview of the files before saving appears. Click "Save" button to save the repaired files to the desired location.

I hope this helps.

Regards,
Lokesh