JPG vs PNG — Difference Between JPG and PNG
JPG and PNG are the two most common image formats on the web, but they solve different problems. JPG is built for photographs and keeps files small; PNG is built for graphics and keeps every pixel perfect, including transparency. This guide explains the difference in plain terms and shows you exactly when to use each.
What Is JPG?
JPG (or JPEG) is a lossy raster format designed for photographs. It compresses images by discarding detail the human eye barely notices, which makes photo files dramatically smaller. Every time you save a JPG at a lower quality, a little more data is lost — so it is best for final, ready-to-publish images rather than working masters.
What Is PNG?
PNG (Portable Network Graphics) is a lossless raster format. It preserves every pixel exactly and supports full alpha-channel transparency, which makes it the standard for logos, icons, screenshots, and any graphic with sharp edges or see-through areas. The trade-off is larger file sizes, especially for detailed photos.
JPG vs PNG Comparison Table
| Feature | JPG | PNG |
|---|---|---|
| Compression | Lossy | Lossless |
| Image Quality | High at 80%+, degrades on re-save | Pixel-perfect, never degrades |
| File Size | Small — ideal for photos | Larger, especially for photos |
| Transparency | Not supported | Full alpha-channel support |
| Best Use Case | Photographs, hero images, blogs | Logos, icons, screenshots, graphics |
| Website Performance | Faster (smaller files) | Slower if overused on photos |
When Should You Use JPG?
- Photographs and image-heavy blog posts where file size drives page speed.
- Hero banners and background images that fill large areas.
- Any image where a tiny quality loss is invisible to visitors.
- E-commerce product photos displayed at fixed sizes.
When Should You Use PNG?
- Logos and icons that need crisp edges at any scale.
- Graphics with text or sharp lines that would blur under JPG.
- Any design that requires a transparent background.
- Screenshots and diagrams where every pixel must stay exact.
JPG vs PNG for Websites
For most websites, the rule is simple: photos are JPG, everything else is PNG. A 200KB JPG photo loads faster and looks the same as a 2MB PNG version. Reserve PNG for the small set of assets that truly need transparency or pixel accuracy, and compress them too.
Quick rule of thumb
If it is a photo → JPG. If it has transparency or text → PNG. When in doubt about file size, compress first and compare.
JPG vs PNG for SEO
Image format affects SEO indirectly through page speed. Google uses Core Web Vitals (LCP in particular) as a ranking signal, and oversized PNG photos are a common cause of slow pages. Choosing JPG for photos and PNG only where needed keeps your Largest Contentful Paint low, which helps rankings. Proper file names and alt text matter more than the format itself.
How to Convert JPG and PNG Online
You do not need desktop software to switch formats. Our free converters run entirely in your browser, so your images never leave your device. Convert a photo to PNG when you need transparency, or convert a PNG to JPG when you need a smaller file.
Try JPG to PNG ConverterConvert JPG to PNG online for free — no upload.Try PNG CompressorShrink PNG files losslessly in your browser.Related Tools
Frequently Asked Questions
Is JPG or PNG better for websites?
Use JPG for photos and complex images where file size matters, and PNG for graphics, logos, and anything that needs transparency. JPG keeps pages light; PNG keeps edges crisp.
Does PNG lose quality when saved?
No. PNG uses lossless compression, so it preserves every pixel exactly. JPG is lossy and discards some data each time you save at a lower quality setting.
Which is smaller, JPG or PNG?
For photographs, JPG is almost always much smaller. For simple graphics with flat colors, PNG can be smaller because it compresses solid areas very efficiently.
Can JPG have a transparent background?
No. JPG does not support transparency. If you need a transparent background, convert to PNG or WebP instead.