PNG vs JPEG vs WebP — which format should you use?
The right format depends entirely on what's in your image. Using the wrong format is one of the most common reasons images are larger than they need to be. Here's the definitive comparison:
| Format | Compression | Transparency | Best For | Typical Size |
|---|---|---|---|---|
| PNG | Lossless | ✓ Yes | Logos, icons, screenshots, text graphics | Large (2–5×) |
| JPEG | Lossy | ✗ No | Photos, portraits, backgrounds | Small (1×) |
| WebP | Both modes | ✓ Yes | Web — best of both worlds | 30% smaller than JPEG |
| GIF | Lossless | ✓ Yes (1-bit) | Simple animations | Medium |
| SVG | Vector | ✓ Yes | Icons, illustrations (code-based) | Tiny for simple shapes |
Rule of thumb: If your image is a photograph → use JPEG. If it has a transparent background or sharp text → use PNG or WebP. If it's going on a modern website → use WebP (supported by all browsers since 2020).
🔗 Related Tools on Aero Tools
How to compress a PNG file (3 steps)
Upload your PNG file. The tool is pre-set to PNG output at 85% quality, which preserves transparency and keeps sharp edges intact.
Optional: switch output to WebP for a 30–40% smaller file with the same quality, if your target platform supports it.
Click Compress, review the size saving, then Download.
Frequently Asked Questions
Why is my PNG so much larger than a JPEG of the same image?
PNG uses lossless compression — every pixel is stored exactly. JPEG throws away imperceptible detail to achieve much smaller files. For a 1200×800 photograph, PNG might be 1.5MB while JPEG at 80% quality is 150KB — 10× smaller. If your PNG doesn't need transparency, converting to JPEG will dramatically reduce the file size.
Will compressing my PNG remove the transparent background?
No — if you select PNG as the output format, transparency is fully preserved. The browser's Canvas API maintains the alpha channel throughout the compression process. Only if you switch the output format to JPEG will the transparent pixels become white (since JPEG doesn't support transparency).
What's the best alternative to PNG for web images with transparency?
WebP. It supports transparency (alpha channel) just like PNG but at 25–35% smaller file size. All modern browsers have supported WebP since 2020. Use our WebP compressor or simply select WebP as the output format here.
Can I use this tool to compress PNG screenshots from Mac/Windows?
Yes — screenshots are typically PNG files of 1–5MB. Upload here and you can compress them significantly, especially if you convert to JPEG (for screenshots without transparency) or WebP. See our dedicated screenshot compressor for more tips.