Image formats
PNG vs JPG vs WebP: Which Image Format Should You Use?
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💬 Switching a single format can cut an image to less than half its size. The trick is knowing WHEN to use which.
PNG, JPG and WebP at a glance
They all look like "image files", but under the hood these three formats compress data in completely different ways.
- PNG — lossless compression. Perfect quality and transparent backgrounds, but large files.
- JPG (JPEG) — lossy compression. Small files by discarding detail your eyes barely notice; no transparency.
- WebP — Google's modern format. 25–35% smaller than JPG while still supporting transparency.
There is no single "best" format — only the right one for the job. Let's break it down.
When to use PNG
PNG's superpower is lossless quality plus transparency. Save it a hundred times and it never degrades, and you can punch a see-through background.
- ✅ Logos and icons that sit on any background
- ✅ Screenshots where text and lines must stay crisp
- ✅ Illustrations and charts with hard color edges
The catch: photos saved as PNG get very heavy. If you don't need transparency, PNG is overkill for photography.
JPG is made for photography
JPG was designed for photos. It compresses the subtle tonal shifts your eye can't distinguish, keeping quality high while slashing file size.
- ✅ Portraits and landscapes
- ✅ Blog images and thumbnails
- ✅ Anywhere file size matters, like email attachments
Note that JPG loses a little quality every time you re-save (generation loss). Keep your master as PNG and export the final JPG once. And remember: transparency becomes a solid white fill in JPG.
| Format | Compression | Transparency | File size | Best for |
|---|---|---|---|---|
| PNG | Lossless | Yes ✅ | Large | Logos, icons, screenshots |
| JPG | Lossy | No ❌ | Small | Photos, thumbnails |
| WebP | Lossy/Lossless | Yes ✅ | Smallest | Web images, fast loading |
WebP — smaller and smarter
WebP gives you JPG-like size with PNG-like transparency. At the same quality it's on average 25–35% lighter than JPG, and in lossless mode it can even beat PNG.
It also helps your ranking. Google treats page speed as a ranking signal (Core Web Vitals), so lighter images score better. Nearly every modern browser — Chrome, Safari, Edge — supports WebP today.
The only caveat: very old browsers or legacy apps may not open it. When that matters, ship a JPG fallback alongside.
Real-world size comparison
The chart below shows the approximate file size of the same 1920×1080 photo saved in each format (results vary by image). WebP is the lightest, PNG the heaviest.
The key insight: the visible quality is similar, but the file size is not. For anything going on the web, WebP or a well-compressed JPG is the answer.
Convert for free, safely
You don't need heavy software to switch formats. YN Converter converts PNG ↔ JPG ↔ WebP right inside your browser — your files never get uploaded to a server, so work documents and personal photos stay private.
- Drag your image in, or click "Choose file"
- Pick the output format (PNG / JPG / WebP)
- Adjust the quality slider if needed, then convert
You can also drop many files at once and download them all as a ZIP. Try it with the button below.
✅ Key takeaways
- Need transparency or crisp edges? Use PNG
- Photos and thumbnails? Use JPG
- Care about web speed and size? Use WebP
- Keep the master as PNG, export JPG/WebP for delivery
💡 TIP
- JPG degrades on every re-save — export it only for the final version.
- WebP improves Core Web Vitals, which helps search ranking.
- Ship a JPG fallback when you must support very old environments.
📌 Checklist
- Does this image need a transparent background?
- Is it a photo, or a logo/diagram?
- Is it going on the web, or for print/archive?
- Is there a file-size limit?
🛒 Before you apply it — checklist
- Is the original file backed up?
- Did you check the output format and quality settings?
- Is the file size right for its intended use?
- Did you confirm it displays correctly on mobile too?