Use PNG for transparency, screenshots, and crisp interface graphics. Use JPG for photographs where broad compatibility matters. Use WebP when you want a compact web-friendly file and your target apps support it.
Format comparison
| Format | Best for | Watch out for |
|---|---|---|
| PNG | Transparency, logos, screenshots, line art | Photographs can become unnecessarily large |
| JPG | Photos, scans, broad compatibility | Lossy compression and no transparency |
| WebP | Web images, smaller downloads, mixed content | Older software may need a fallback |
PNG: sharp edges and transparency
PNG keeps hard edges clean and supports transparent pixels. That makes it a good default for interface screenshots, icons, diagrams, and logos. It is not automatically the smallest format for a photograph: photographic detail gives PNG much more information to preserve.
JPG: the dependable photo format
JPG uses lossy compression, which is often a useful trade-off for photos. Quality settings let you reduce file size while keeping an image visually convincing. Avoid repeatedly exporting the same JPG because each lossy export can discard more detail.
WebP: a compact web default
WebP can provide a smaller file than JPG or PNG for many web images. It supports transparency and lossy or lossless modes. Check the software or publishing system that will receive the file, and keep a PNG original when you may need to edit it later.
How to convert privately
QuietKit’s image converter reads a browser-supported image into memory and writes the result with Canvas. The image resizer also lets you change dimensions and compare the original and output sizes. The files are not sent to a QuietKit processing endpoint.
Frequently asked questions
Is WebP always smaller?
No. The result depends on the source image, dimensions, and quality setting. Compare the output size and inspect important details rather than assuming a format wins every time.
Can I convert without uploading the image?
Yes, when the browser can decode the file. A browser-local converter can read the file from your device, draw it to a Canvas, and create a download without sending the pixels to a server.
Which format should I keep as the original?
Keep the highest-quality source that you can edit. Treat JPG or compressed WebP exports as delivery copies, not as your only archive.