JPEG and JPG are the same image format. There is no technical difference between a .jpg file and a .jpeg file — they use identical compression, store identical data, and are opened by the same software. The only difference is the file extension, and that exists for a historical reason that no longer applies.

Why Two Extensions for the Same Format?

When JPEG was standardized in 1992, the file extension was .jpeg. Windows 3.x (and older DOS systems) had a strict 8.3 filename limit — maximum 8 characters before the dot, maximum 3 characters after. The four-letter .jpeg extension wasn't allowed, so Microsoft used .jpg instead.

That limitation disappeared with Windows 95, but by then .jpg was already the dominant extension. Today both are used:

Windows and digital cameras typically produce .jpg files
Mac and Linux systems often default to .jpeg
Both extensions are recognized by every modern image viewer and web browser

Are the Files Identical?

Yes. If you rename a file from photo.jpeg to photo.jpg, the file is byte-for-byte unchanged. The image data is not affected by the extension. You can rename either way without re-encoding or losing any quality.

What Is JPEG/JPG Format?

JPEG (Joint Photographic Experts Group) is a lossy compression format designed for photographs and complex images with gradual color transitions. Key characteristics:

Lossy compression: discards some image information to achieve smaller files. The amount discarded depends on quality setting (1–100)
Best for photos: handles continuous-tone images (like photographs) extremely well. Poor for sharp edges, text, and flat-color graphics
No transparency: JPEG doesn't support alpha channel. Use PNG or WebP when transparency is needed
No animation: JPEG is a still-image format only
Wide compatibility: supported by every device, browser, email client, and operating system

JPEG Quality Settings

JPEG quality (typically expressed as 1–100 or 0–12 in Photoshop) determines how much compression is applied:

90–100: near-lossless, large files. Use for archiving or print
80–90: high quality, half the file size of 100. Standard for photos
70–80: good quality, very small files. Standard for web images
Below 60: visible compression artifacts (blocky areas, color banding). Avoid for most uses

Use the image compressor to reduce JPEG file size. The sweet spot for web images is 75–85% quality.

JPEG vs PNG — Which Should You Use?

Use JPEG/JPG for: photographs, product photos, complex images with gradients, any image without transparency
Use PNG for: logos, icons, screenshots, images with transparency, graphics with text, any image where lossless quality is required

JPEG vs WebP — Should You Switch?

For web use, WebP is a better choice than JPEG in 2025:

WebP is 25–35% smaller than JPEG at comparable quality
WebP supports transparency (JPEG doesn't)
WebP is supported by all modern browsers (Chrome, Safari, Firefox, Edge)
WebP is not yet universally supported in email clients — use JPEG for emails

Convert your JPG photos to WebP for web use with our JPG to WebP converter. For even better compression, JPG to AVIF gives 30–50% smaller files than JPEG.

Common Questions

Can I rename .jpeg to .jpg? Yes — no quality loss, no re-encoding. It's just renaming the extension
Do JPEG and JPG compress the same way? Yes — they're the same format
Which is better quality, JPEG or JPG? Neither — they're identical. Quality depends on the compression level, not the extension
Why does my camera save .jpg but my Mac shows .jpeg? Different systems use different default extensions, but both are the same format
Is .jpg or .jpeg the "correct" extension? JPEG is the official name, but .jpg is more common. Both are correct