Compress PNG Files
Cut PNG screenshots, icons and graphics down by reducing them to a smaller color palette. Transparent backgrounds stay transparent.
- On-device
- No sign-up
- Batch
- Free, no watermark
Drop images on the plate
or paste with Ctrl/⌘ V
Processed on this device
How it works
- 01Drop, choose or paste your PNG files, including screenshots from the clipboard.
- 02Pick a color count, or keep the default of 256.
- 03Select Process and compare each preview with the original.
- 04Download each PNG or select Download all to get a ZIP.
Why use this tool
Often 50–80% smaller
Screenshots and flat graphics typically shrink by half or more, because most of them use far fewer than 256 distinct colors.
Transparency preserved
Logos and icons with transparent backgrounds keep their alpha channel, so they still sit cleanly on any page color.
Choose the color count
Pick anywhere from 2 to 256 colors. Fewer colors means a smaller file; 256 is the safe default.
Supported formats
Use cases
Documentation screenshots
Writers adding dozens of UI screenshots to a help center can shrink each one so articles load quickly and text stays legible.
Logos for a website
Compress a transparent PNG logo before adding it to a site header, keeping clean edges against any background color.
Slide deck graphics
Reduce charts and diagrams exported as PNG so a presentation file stays small enough to email or upload.
Technical details
PNG compression on this page is lossy color quantization. The image is mapped to a palette of 2 to 256 colors (256 by default), then the result goes through lossless deflate optimization. Screenshots, UI captures, diagrams and logos usually save 50–80% because they contain large flat areas. Photos saved as PNG can show banding in gradients when the palette is small, so a photo is often better off as JPG or WebP.
If you need every pixel unchanged, for example for pixel art or source files you will edit again, use Optimize PNG instead. It is lossless and recompresses the file without touching the pixels, so savings are smaller but nothing is altered. Choose this page when a smaller file matters more than an exact pixel match, which covers most screenshots, documentation images and web graphics.
Your files stay with you
This tool runs entirely inside your browser using Web Workers and WebAssembly. Your images are never uploaded, never stored on a server and never used to train AI. Close the tab and they’re gone. Learn more
Frequently asked questions
Why is my PNG file so large?
PNG stores pixels losslessly, so high-resolution screenshots, and especially photos saved as PNG, can run to several megabytes. Reducing the image to a palette of up to 256 colors removes information you rarely notice and usually makes the file much smaller.
Will compressing a PNG remove the transparent background?
No. Transparency is preserved during color quantization, so a logo or icon with a transparent background stays transparent. You can place it on a light or dark page and the edges stay clean.
Is PNG compression lossless?
Not on this page. Reducing the colors is lossy, although at 256 colors the change is usually hard to see. If you need an exact pixel match, the Optimize PNG tool uses OxiPNG for lossless recompression instead.
How many colors should I choose?
Start with 256, the default. For simple logos, icons and diagrams with few shades, try 64 or 32 and compare the preview. Photos and screenshots with gradients usually need the full 256 to avoid visible banding.
Can I compress PNG screenshots straight from the clipboard?
Yes. Take a screenshot, then press Ctrl+V (Cmd+V on a Mac) on this page to paste it. It joins the list like any dropped file, is compressed locally, and is never uploaded.
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