PNG vs JPG: Which Format Should You Use? (Simple Guide)
PNG vs JPG — picking the wrong format gives you bloated files or lost transparency. Learn exactly when to use each, and how to convert between them for free.
You've saved a logo as JPG and ended up with an ugly white box instead of a transparent background. Or you've exported a photograph as PNG and wondered why it's 4 MB when the JPEG version would be 400 KB. Both are classic format mistakes — and they're completely avoidable once you know the rule.
PNG vs JPG comes down to one core question: does your image need transparency, or does it need to be small?
PNG vs JPG at a Glance
| Feature | JPG | PNG |
|---|---|---|
| Best for | Photos, social media images | Logos, graphics, screenshots |
| Transparency | ❌ No | ✅ Yes |
| Compression | Lossy (discards data) | Lossless (preserves all data) |
| File size | Smaller | Larger |
| Re-save quality | Degrades each time | No degradation |
| Best for text/sharp edges | ❌ Blurs edges | ✅ Keeps edges crisp |
What Is JPG — and When Should You Use It?
JPG (also written JPEG) uses lossy compression. When you save a file as JPG, the encoder discards some image data to make the file smaller. The tradeoff is usually invisible at moderate quality settings — but compress too far and you'll see blocky artifacts around edges and gradients.
Use JPG for:
JPG doesn't support transparency. If your image has a transparent background and you save it as JPG, that area becomes solid white. Sound familiar?
What Is PNG — and When Should You Use It?
PNG uses lossless compression. Every pixel is preserved exactly, no matter how many times you re-save the file. That's ideal for pixel-perfect quality — but it comes at a cost: PNG files are significantly larger than JPG for the same image.
Use PNG for:
Here's what most guides miss: PNG isn't "higher quality" than JPG for photos. For a complex photograph, JPG at 90% quality will look identical to PNG — and be 3–5× smaller. PNG's advantage isn't higher quality; it's no quality loss, which only matters for specific content types.
File Size: Why JPG Wins for Photos
Imagine you're building a photo gallery with 50 full-resolution images. As PNG, each photo might be 5 MB — that's 250 MB total. The same photos as JPG at 85% quality? Under 500 KB each, virtually indistinguishable to the human eye.
JPG's compression works by grouping similar-colored pixels together. In photographs with natural gradients and complex detail, this is nearly invisible. That's why every camera defaults to JPG.
Key takeaway: For photographs, JPG is almost always the right choice. Smaller files, no visible quality loss.
If you need to reduce a JPG further — say, to meet an email attachment limit or a government portal requirement — use imresizer's compress tool to hit an exact file size in KB or MB.
Transparency: Why PNG Is the Only Choice
If you need a transparent background, stop right there. JPG can't do it.
When you open a transparent PNG in any editor, you see the checkered pattern that represents transparency. Save that as JPG and the transparent areas become solid — usually white. That's why logos exported as JPG look fine on white backgrounds but completely wrong when placed on a colored webpage or dark banner.
PNG handles transparency through an alpha channel — a 4th data channel controlling pixel opacity from 0 (fully transparent) to 255 (fully opaque). This is what lets a logo sit cleanly on any background color.
WebP also supports transparency and compresses better than PNG in most cases. If you're working with web content, converting to WebP gets you PNG's transparency with closer-to-JPG file sizes.
Quality vs Compression: The Real Trade-off
The choice isn't about which format is "better" in general. It's about matching the format to the content type:
What about screenshots specifically? Always PNG. JPG's block compression creates visible artifacts around text — a screenshot of a document saved as JPG will have muddy, blurry characters. PNG preserves them perfectly.
And if you need to convert an existing file? No need to download any software.
How to Convert Between PNG and JPG Using imresizer
Whether you're converting a PNG logo to JPG for an email, or turning a JPG photo into PNG for editing, here's how:
- Go to Image to JPG or Image to PNG
- Upload your image — click the button or drag and drop. You can convert up to 12 images at once.
- Download your converted file instantly.
Everything runs in your browser — no signup, no watermark, no server uploads. Your images never leave your device.
Need to resize or compress the image at the same time? Use Resize & Reduce to set new dimensions and a file size limit in one step.
Key Takeaways
Free Image Format Conversion Tools
Frequently Asked Questions
Is PNG or JPG better quality?
Neither is strictly better — they serve different purposes. PNG preserves every pixel exactly (lossless), while JPG compresses by discarding some data (lossy). For photos, JPG at 80–90% quality is virtually identical to PNG but 3–5× smaller. For logos and screenshots, PNG keeps edges sharper and text crisp.
Why is my PNG so much bigger than my JPG?
PNG saves every pixel with no data loss. For photos with millions of color variations, this creates very large files. JPG groups similar pixels together to reduce size — which works well for photos but creates visible artifacts on graphics with sharp edges and text.
Can JPG have a transparent background?
No. JPG doesn't support transparency. If you save an image with a transparent background as JPG, the transparent areas become solid (usually white). Use PNG or WebP if transparency is required.
Should I use PNG or JPG for my website?
Use JPG for photos and images with many colors — it keeps page load times fast. Use PNG for logos, icons, and UI elements where sharp edges and transparency are needed. WebP is worth considering for both, as it generally offers better compression than either format.
How do I convert a PNG to JPG online?
Use imresizer's free converter — upload your image, convert, and download instantly. No account needed, everything runs in your browser. You can convert up to 12 images at once.