WebP vs PNG vs JPEG: Which Image Format Should You Use?
Stop guessing. Here is a decision tree for choosing between JPEG, PNG and WebP — with the actual size differences.
Aria Chen
Senior Tech Editor
Three formats dominate the web, and each one is best at something different. Choosing wrong costs you either quality or speed — often both. Here is the decision tree we actually use.
The one-paragraph summary
Photographs go in JPEG (or WebP). Anything with sharp edges or transparency goes in PNG (or WebP). WebP is the smallest version of either — use it whenever browser support is not a constraint, which for most modern sites is always.
Head to head
| Format | Best for | Transparency | Size | Browser support |
|---|---|---|---|---|
| JPEG | Photos, gradients | No | Small | Universal |
| PNG | Logos, icons, screenshots | Yes | Large | Universal |
| WebP | Everything above | Yes | Smallest | All modern browsers (95%+) |
The size gap is the headline. A 100 KB JPEG photo saved as WebP typically lands at 55–70 KB with identical quality. A 500 KB PNG icon converted to WebP often drops below 150 KB. On a page with twenty images, that difference is seconds of load time.
When PNG still wins
PNG is lossless and always precise — valuable for pixel-perfect assets like app icons, diagrams and anything that will be re-edited. For those cases the file size is a fair price to pay.
When JPEG still wins
JPEG has the deepest compatibility and the broadest tooling. If you are emailing a photo to someone with an old device, or uploading to a system that does not accept WebP, JPEG is the safe choice.
Default to WebP for the web, JPEG for email and compatibility, PNG for graphics and editing. That covers 99% of decisions.
Is WebP supported everywhere?
Essentially yes — all modern browsers support it, covering over 95% of web traffic. Only older Safari versions and some niche devices fall back.
Is PNG or WebP better for screenshots?
WebP is dramatically smaller at identical quality. Use PNG only when you need the file to be lossless and re-editable.
Can I convert JPEG to PNG without losing quality?
The pixel data stays intact, but the file will be much larger — PNG does not compress photos efficiently. Convert only when you need transparency.
Written by Aria Chen
Aria writes about web technology, image formats and developer workflows. She has spent 10+ years building and documenting web products.
Tools used in this article
Convert images between JPG, PNG, WebP, GIF and BMP.
Image Compressor
PopularShrink JPG, PNG and WebP files without losing visible quality.
Resize images to exact dimensions, scales or target sizes.
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