Image Compression
Compress PNG Images
PNG stores pixels losslessly, which makes it ideal for logos, screenshots and any graphic with sharp edges or transparency. The trade-off is weight: a full-colour photograph saved as PNG can be ten times larger than the same image as JPEG.
This tool re-encodes your PNGs and reports exactly how many bytes were saved for each file.
Drag images here
JPG, PNG or WebP · up to 20 files · processed inside your browser
How to use this tool
- 1Add your PNG files to the drop area.
- 2Adjust the quality control to influence how aggressively the encoder works.
- 3Run the compression and compare the original and new sizes.
- 4Download each file, or export the whole batch as a ZIP.
Why PNG files get large
PNG uses DEFLATE compression over raw pixel data. It works brilliantly on flat colour, repeated patterns and text, because those areas compress into very short sequences. It works poorly on photographic noise, where almost every pixel differs from its neighbour and there is nothing to collapse.
When PNG is the wrong choice
If your image is a photograph and has no transparency, converting it to JPEG or WebP will save far more than any PNG optimiser can. A 2 MB PNG photo often becomes a 180 KB WebP at a quality level nobody notices. Screenshots of interfaces, on the other hand, should stay PNG, because JPEG smears text.
Transparency is preserved
The alpha channel survives compression here. If you need transparency and smaller files at the same time, the PNG to WebP converter is usually the better path, since WebP supports alpha while compressing much more efficiently.
Frequently Asked Questions
Will transparency be lost?
No. PNG output keeps the alpha channel exactly as it was.
Why is the saving smaller than for JPG?
PNG is lossless by design, so there is far less redundancy left to remove. Converting to WebP usually saves much more.
Does this reduce the colour palette?
The browser encoder does not run palette quantisation. Expect modest savings on flat graphics and larger savings on noisy images when you convert format instead.
Can I compress screenshots?
Yes, and PNG is the right format for them. Text and interface edges stay crisp because nothing is discarded.