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Getting a PNG under 100 KB
PNG keeps every pixel exactly, which is why a single screenshot or scanned page saved as PNG can be several megabytes. The result here stays a PNG: we reduce it to 256 colours, which screenshots, logos and diagrams barely show, and make it smaller in pixels only as far as 100 KB needs.
We try it at full size first, then step the pixel dimensions down, keeping the largest PNG that fits under 100,000 bytes. Transparent areas stay transparent.
Tips
- Logos keep their transparency, so they still work on a coloured background.
- Crop screenshots to the part you need. A full-screen capture of a 4K display is a lot of pixels to squeeze.
- A photo saved as PNG has many more colours than a screenshot or logo, so it loses more detail when reduced to 256 colours.
Questions
How small in pixels can a PNG get to fit under 100 KB?
We try full size first, then step the longest side down through 6000, 5000, 4000 and so on to 1000, 800, 640 and finally 480 pixels. That goes further than our JPEG steps, which stop at 800, because a PNG has no quality setting to lower instead.
My PNG is 150 KB. Will it lose colours to get under 100 KB?
Not necessarily. When 100 KB is at least 60% of the file, as here, we first re-save it as a PNG with every pixel and colour kept. That gains 3 to 10% on an already compressed PNG and about half on one saved with weak compression. Only if it misses do we reduce it to 256 colours.
Will a Mac screenshot's colours shift when it is reduced to 100 KB?
Mac screenshots carry a Display P3 colour profile, which the 256-colour PNG does not keep. We convert the colours to sRGB before reducing them, so the result looks like the original rather than slightly faded.
Related pages
PNG