Why PNG files are so big, and how JPG fixes it
PNG is lossless: it stores every pixel exactly. That is perfect for logos and screenshots, but for photos it creates huge files. A phone photo saved as PNG can easily be 8 to 15 MB, while the same photo as JPG at 85% quality is often under 2 MB and looks the same.
- Use 80 to 90% quality for photos. You will not see the difference, and the file will be much smaller.
- Add a maximum width to go further. 1,920 pixels suits full-screen viewing; 1,200 pixels suits email and most websites.
- Check the new size. The tool shows the size before and after, so you know if it fits an upload limit.
Common mistakes
- Converting logos to JPG. Logos usually have a transparent background and sharp edges. As JPG they get a white box and fuzzy edges. Keep logos as PNG, or use WebP.
- Converting the same JPG again and again. Each JPG save loses a little quality. Keep the original PNG and convert from it each time.
- Not checking a size limit. If a form needs under 100 KB, follow the steps on the Compress image page.
Examples
Emailing photos: five PNG photos at 10 MB each will not fit in one email. Converted to JPG at 85% and 1,920 pixels wide, they are usually under 1 MB each.
A job application photo: the portal asks for a JPG under 200 KB. Convert your PNG to JPG with a maximum width of 800 pixels and check the size shown.
Website images: product photos load much faster as JPG or WebP than as PNG, which helps visitors on mobile data.