How to open a .jpg file
JPEG image · Image
Every device and browser opens JPG files. If yours will not, the file is truncated, is not really a JPEG, or Windows Photos is misbehaving and another viewer will open it fine.
What a .jpg file actually is
JPEG has been the standard photographic image format since 1992. It compresses by discarding detail the eye is least likely to notice, which is why the files are small and why quality degrades each time you re-save.
Support is universal on every platform ever made, which changes what a failure means: the problem is the file, not the software.
Why it will not open
A truncated download is the most common cause, followed by a file renamed from another format, and then Windows Photos itself failing while every other viewer works.
Renaming it to an extension you can open will not help: changing the extension does not convert the file, it only changes what Windows tries to open it with.
Step by step
Windows
- 01Test with a different viewer: drag the file onto a browser window. If it displays there, the image is fine and Photos is the problem.
- 02Check the size. A few bytes means the download never finished.
- 03Confirm the format in HxD: a real JPEG starts with the bytes FF D8 FF.
- 04If the header shows PNG or something else, rename the file to the right extension and it opens.
macOS
- 01Double-click. Preview opens JPEG natively.
- 02Run "file photo.jpg" in Terminal when it refuses, to see what the file actually is.
What usually goes wrong
Re-saving loses quality every time
JPEG is lossy, so each save discards more detail. Editing and re-saving the same photo repeatedly visibly degrades it. Keep an original and export copies rather than overwriting.
Programs that open .jpg
Our pick, in order. Every one links to the publisher's official download URL and the SHA-256 hash of the installer. Once you have downloaded it, you can check the file against our index before you run it.
If you end up downloading one of these from somewhere other than the publisher, what you can and cannot verify about that is worth two minutes.
Also registers .jpg in its manifest
Taken straight from publisher manifests. Some of these handle the format for a narrow purpose rather than as their main job.
Common questions
- Why will my JPG file not open?
- JPEG support is universal, so it is almost always the file: an incomplete download, or another format renamed to .jpg. Drag it onto a browser to test, and check that the header begins FF D8 FF.
- Is .jpg different from .jpeg?
- No, they are the same format. The three-letter spelling exists because early Windows limited extensions to three characters. Renaming between them changes nothing.