Shrinkrs / Compress images
Compress PNG images online
Make PNG files smaller without losing transparency. Shrinkrs reduces the colour palette and repacks the file, all inside your browser. Your images are never uploaded.
No image handy?
For PNG, quality sets how many colours are kept. 100 keeps them all and 60 to 80 suits most graphics. Photos may need a higher setting to avoid banding.
How to use the Compress PNG tool
- STEP 1
Add your PNG files
Drop up to 50 PNGs on the box, or paste a screenshot straight from your clipboard.
- STEP 2
Choose the quality
Around 80 suits most graphics. Lower it for a smaller file, or set a target size in KB.
- STEP 3
Download
Save each file on its own or take the whole batch as a ZIP.
How PNG compression works
PNG is a lossless format, so a normal re-save barely changes the size. The big savings come from reducing the number of colours, usually down to a 256-colour palette, and then repacking the pixels. That is the technique dedicated PNG optimisers use, and it is what the quality slider controls here.
At 100 the file is repacked with every colour kept, which typically saves a modest amount. Lower values trim the palette harder. Screenshots, logos, icons and flat illustrations often shrink by half or more with no visible change. Photos and smooth gradients are different: below roughly 70 you may see banding.
When another format is the better answer
A photo saved as PNG can be many times larger than the same photo as a JPEG or WebP. If the image has no transparency, switch the Format menu to JPEG. If it does have transparency, choose WebP, which keeps the alpha channel and is usually far smaller than PNG.
The other lever is dimensions. A 4000-pixel-wide screenshot displayed at 800 pixels carries a lot of data nobody sees. Setting a max width often saves more than any quality setting.
Questions people ask
Does it keep the transparent background?
Yes. When the output stays PNG or becomes WebP, transparency is preserved. JPEG has no transparency, so a transparent PNG converted to JPEG gets a white background.
Is the compression lossy?
At quality 100 the pixels are unchanged. Below that, colours are reduced to a smaller palette, which is a lossy step. For most graphics the difference is not visible, but compare the result with the original before using it for print.
Why is my PNG still large after compressing?
It is probably a photo or has very high resolution. Try a max width of 1920 px, or switch Format to WebP. Those two changes usually matter more than the quality slider.
Are my images uploaded anywhere?
No. Compression runs on your device in the browser. Nothing is sent to a server, so it also works for private screenshots and documents.
What is the best quality setting for PNG?
Start at 80 and look at the preview thumbnail. If it looks the same, try 60. Stop when you notice banding or colour shifts, then go back up one step.