PNG vs JPG: Which Image Format Should You Use?
PNG and JPG are the two most common image formats on the internet, and choosing the wrong one can mean bloated file sizes or degraded quality. Here's a clear breakdown of when to use each.
The Core Difference: Lossy vs Lossless
JPG uses lossy compression — it permanently removes some image data to make the file smaller. The more you compress, the more quality you lose. Once saved as JPG, that quality cannot be recovered.
PNG uses lossless compression — it retains every single pixel. No quality is lost regardless of how many times you save the file. PNG files are larger, but they're perfect copies of the original.
When to Use JPG
- Photographs — JPG handles the millions of subtle color variations in photos efficiently. A high-quality JPG photo is typically 60–80% smaller than the equivalent PNG.
- Social media images — Instagram, Facebook, and Twitter all accept JPG. Platforms often re-compress uploads anyway, so starting with a compressed JPG minimizes double-compression.
- Email attachments — Smaller file sizes mean faster sending and receiving.
- Blog post images — Faster loading pages, lower bandwidth costs.
When to Use PNG
- Logos and icons — PNG preserves sharp edges on text and lines that JPG would blur.
- Images with transparency — PNG supports alpha-channel transparency. JPG does not.
- Screenshots — Especially screenshots with text — PNG keeps text razor sharp.
- Design assets — If you'll edit the image further, PNG prevents quality degradation across multiple save cycles.
- Images with flat colors — Illustrations, charts, and diagrams compress better in PNG than JPG.
File Size Comparison
As a rough benchmark, a 1920×1080 photograph:
- PNG: ~3–5 MB
- JPG at 80% quality: ~300–600 KB
- JPG at 60% quality: ~150–250 KB (visible quality loss)
For photographs, the file size difference is dramatic. For a logo with a transparent background, PNG is the only viable choice.
What About WebP?
WebP is the modern alternative that beats both PNG and JPG. It achieves smaller files than JPG for photographs, supports transparency like PNG, and is supported by all modern browsers. If you're optimizing for web performance, converting to WebP is worth considering.
Quick Decision Guide
| Use Case | Best Format |
|---|---|
| Photo for web | JPG or WebP |
| Logo with transparent background | PNG |
| Screenshot with text | PNG |
| Social media photo | JPG |
| Design asset for editing | PNG |
| Web banner/hero image | WebP or JPG |