When PNG to JPG makes sense
PNG is lossless, which is perfect for screenshots and graphics but wasteful for photographs: a photo saved as PNG can be five to ten times larger than a good JPEG that looks identical. If you have photos in PNG (often from screenshots of photos, editing apps or design tools), converting to JPG cuts the size dramatically.
When to keep PNG
Screenshots with text, diagrams, logos and anything with sharp edges and flat colours usually look worse as JPEG (faint halos around text) and may not even be smaller. Keep those as PNG, or try PNG to WebP, which handles both well.
Transparency
JPEG cannot be transparent. Transparent areas are filled with white, which the note under the result mentions. Keep transparency with WebP or by staying in PNG.
Quality
Quality 80–85 suits photos; the live preview shows the size and lets you compare.
PNG and JPG compared
| Feature | PNG | JPG |
|---|---|---|
| Compression | Lossless | Lossy |
| Best for | Graphics, screenshots | Photos |
| Transparency | Yes | No |
| Photo file size | Large | Small |
Step by step
- Add your PNG files: choose them, drag them onto the page, or paste.
- Set the quality; 85 is a good default.
- Click Convert to JPG.
- Download each file, or all of them as a ZIP. File names stay the same with the new extension.
Without this tool
Open the PNG in Paint (Windows) and use Save as → JPEG, or in Preview (Mac) use File → Export → JPEG with the quality slider. Transparent areas become white or black depending on the app.
Troubleshooting
- A file shows an error. It may not really be PNG: files are sometimes renamed without being converted. The tool reads the file's contents, not its name, and says what it found.
- The converted file is larger. That is expected when going to a less efficient or lossless format; it is not a fault.
- Colours shift slightly. Wide-gamut originals are converted to standard sRGB, which every screen shows consistently.
Screenshots of photos
Phones save screenshots as PNG, so a screenshot of a photo becomes a large PNG. Converting it to JPG at quality 85 typically cuts it to a fifth of the size or less. If the screenshot is mostly text, like a chat or a receipt, it may compress better as PNG; try both and compare the sizes shown under each result.
Choosing the background colour
Transparent areas are filled with white, which suits documents and most web pages. If the image will sit on a dark page, keep it as PNG or WebP instead so the transparency remains.
Private by design
The image never leaves your device. It is decoded in your browser, processed in a background worker by open-source codecs compiled to WebAssembly (MozJPEG, libwebp, libavif and OxiPNG, via the jsquash project, plus pica for resizing) and handed back as a download. There is no upload, no account and no server copy to delete. You can confirm it in your browser's developer tools: the Network tab shows the page's own files and the codec files loading, and nothing carrying your image. After the first visit the tools work offline.