How to Convert Between JPG and PNG: When to Use Which
JPG and PNG are the two most common image formats on the web. They look the same to most people, but they work very differently under the hood — and using the wrong one can mean unnecessarily large files or unexpected quality loss.
The key difference
JPG (JPEG) uses lossy compression. It makes files small by discarding image data that your eye is unlikely to notice. Great for photos, bad for sharp graphics.
PNG uses lossless compression. It preserves every single pixel exactly, but files are larger. Great for screenshots, logos, and anything with text or sharp edges.
When to convert JPG to PNG
- You need transparency — JPG does not support transparent backgrounds. If you need to place an image on a colored or textured background, convert to PNG.
- You are editing the image repeatedly — each time you save a JPG, it recompresses and loses a tiny bit more quality. Convert to PNG first, edit as many times as you need, then save back to JPG only when done.
- The image has text or sharp lines — JPG compression creates visible artifacts around sharp edges. PNG keeps them crisp.
When to convert PNG to JPG
- Photos and realistic images — a PNG photo can be 3-5x larger than the same image as a high-quality JPG, with no visible difference to the eye.
- You need to reduce file size — sending photos via email or uploading to a website is much faster with JPG.
- The image does not need transparency — if it will always be on a white or solid background, JPG is smaller and perfectly fine.
How to convert
JPG to PNG:
- Upload your JPG files — drag and drop or click to browse.
- Click "Convert to PNG" to process your images.
- Download your lossless PNG images.
PNG to JPG:
- Upload your PNG files.
- Adjust the quality slider if needed (higher quality = larger file).
- Download your compressed JPG images.
Quick reference
| Feature | JPG | PNG |
|---|---|---|
| Compression | Lossy | Lossless |
| File size | Smaller | Larger |
| Transparency | No | Yes |
| Best for | Photos | Screenshots, graphics, logos |
| Repeated editing | Quality degrades | Quality preserved |
| Web performance | Faster loading | Slower loading |
Tips
- Do not convert JPG to PNG to "improve quality" — if quality was already lost during JPEG compression, converting to PNG will not bring it back. It just makes the file larger.
- Use PNG for work-in-progress — edit in PNG, export to JPG when you are done.
- Consider WebP — if your images are going on the web and you do not need to support very old browsers, WebP gives you smaller files than either JPG or PNG.
Frequently Asked Questions
Is converting JPG to PNG lossless?
Yes. Converting from JPG to PNG preserves all existing pixel data without any additional quality loss. However, any quality already lost during JPEG compression cannot be restored.
Why is my PNG file so much larger than the JPG?
PNG uses lossless compression, which preserves every pixel exactly. JPEG uses lossy compression that discards data your eye is unlikely to notice. The trade-off is file size vs. perfect quality.
When should I use WebP instead?
WebP offers the best of both worlds — lossy and lossless compression in smaller file sizes than either JPG or PNG. Use it when your audience uses modern browsers (over 97% support WebP now).
Can I convert multiple images at once?
Yes. Most browser-based converters support batch processing. Upload multiple files and they will all be converted with the same settings.