JPG vs PNG: Which Image Format Should You Use?
A practical comparison of JPG and PNG quality, file size, transparency, and the best format for common image tasks.
The short answer
Use JPG for photographs and complex images where a smaller file matters. Use PNG for logos, interface graphics, screenshots, or any image that needs transparency or crisp edges. Neither format is universally better: the right choice depends on what the image contains and where it will be used.
How JPG compression works
JPG uses lossy compression. It reduces file size by discarding visual information that is often difficult to notice at sensible quality settings. This works especially well for photographs, gradients, and images with many colors.
Repeatedly editing and exporting a JPG can introduce blockiness, halos, and blurred edges. Keep an original master file and create a fresh JPG for delivery when possible.
- Best for photos, email attachments, and web hero images
- Usually smaller than PNG for photographic content
- Does not support transparent backgrounds
How PNG compression works
PNG uses lossless compression, so saving the file does not throw away image detail. It preserves hard edges and flat colors particularly well and supports full alpha transparency.
A photographic PNG can be several times larger than an equivalent JPG. That extra weight rarely improves what a visitor can see, so PNG should be chosen for its specific strengths rather than by default.
- Best for logos, diagrams, screenshots, and transparency
- Preserves exact pixel data
- Can be inefficient for camera photos
Choosing for websites and social media
For a website, choose the smallest format that keeps the image looking clean at its displayed size. JPG is a dependable option for photos; PNG is better when transparency or sharp text is essential. Modern formats such as WebP may reduce size further, but JPG and PNG remain useful as compatible source and fallback formats.
Social platforms usually recompress uploaded images. Export once at the recommended dimensions and avoid repeatedly downloading and re-uploading the same file.
Common mistakes
Do not convert a low-quality JPG to PNG expecting lost detail to return. The PNG will preserve the existing artifacts, not reconstruct the original image. Likewise, flattening a transparent PNG to JPG requires choosing a background color because JPG has no transparency channel.