What is JPG (JPEG)?
JPG (JPEG) is a lossy image compression format developed in 1992, widely used for photographs and web images due to its excellent balance of quality and small file size.
What is it?
JPG (also written as JPEG - Joint Photographic Experts Group) is a lossy image compression format created in 1992. It is the most widely used image format on the internet, in digital cameras, and on smartphones worldwide.
The format works by discarding image data that the human eye is least likely to notice, achieving dramatic file size reductions. A high-quality JPEG can be 10x smaller than an uncompressed version of the same image with virtually no visible quality loss.
Technical Specifications
Pros & Cons
Advantages
Dramatic compression with minimal visible quality loss - up to 10x smaller than uncompressed.
Supported by every browser, device, camera, and operating system in existence.
Quality setting 1–100 gives full control over the size vs quality trade-off.
Perfect for photographs and complex images with millions of colors and gradients.
Disadvantages
Each save re-compresses the image causing gradual quality degradation over time.
Does not support alpha channel - transparent areas are filled with white.
Blocky artifacts appear at low quality settings especially around sharp edges.
Not suitable for text, logos, or flat-color graphics - use PNG or SVG instead.
When to Use It
JPG is the right choice for most photographic content and anywhere file size is a priority.
Photography
Digital cameras and smartphones save photos as JPG by default. Perfect for portraits, landscapes, and natural scenes.
Web Images
Smaller file sizes mean faster page loads. Use JPG for all photographic web content.
Social Media
Most social platforms re-compress uploads to JPG. Upload as JPG for predictable quality control.
Email & Sharing
Small JPG files are easy to share via email and messaging apps without hitting size limits.
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What is the difference between JPG and JPEG?
There is no difference - they are the same format. JPG became common because early Windows limited extensions to 3 characters.
Does saving a JPG multiple times reduce quality?
Yes. Each save re-applies lossy compression causing gradual degradation. Keep originals in PNG and export to JPG only as a final step.
What quality setting should I use for JPG?
For web use quality 70–80 is ideal. For print use 85–95. Quality above 95 rarely makes a visible difference but significantly increases file size.
Can JPG files have a transparent background?
No. JPG does not support transparency. Use PNG, WebP, or SVG instead. JPG fills transparent areas with white by default.
Is JPG or PNG better for web images?
For photographs JPG is smaller. For graphics and text PNG is better. For modern web use, WebP outperforms both.