Shrink a PNG File

Reduce a PNG in the browser — no install, no upload limit games, no watermark on the way out.

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No watermark
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Batch ready

Add your PNG.
Choose how far the palette may be reduced.
Download the result.

All compresspng.org tools

Shrink a PNG Shrink PNG Reduce a PNG in the browser — no install, no upload limit games, no watermark on the way out. Batch compress PNGs Whole folder Drop in a folder's worth of PNGs and get them all back in one download. Compress a large PNG Large files For the multi-megabyte exports: caps the longest edge at 2560px and reduces the palette hard. Compress a transparent PNG Keep alpha A gentle setting tuned for logos, icons and cut-outs where clean edges matter most. PNG to WebP PNG → WebP Transparency like PNG, file sizes closer to JPEG. The modern answer for the web.

compresspng.org answers the question two ways. There are tools here that will compress a PNG right now, including presets for the awkward cases — very large files, whole folders, and artwork that must keep clean transparent edges.

And there is the handbook: how PNG compression actually works, what lossless really means, and step-by-step instructions for the software already on your machine — Preview and Photos on a Mac, Paint and Photos on Windows, Photoshop, and GIMP.

Do it where you already are

You do not always need a website. macOS can export a smaller PNG straight from Preview; Windows can do it from Paint; Photoshop has Export As with a dedicated PNG panel; GIMP exposes the compression level directly. Each has a quirk worth knowing before you rely on it, and each has a guide in the handbook.

The one idea worth taking away

PNG is lossless by design. It compresses by finding repetition, which flat colour and sharp edges have in abundance and photographs do not. Every practical decision follows from that: graphics compress beautifully as PNG, photographs never will, and the biggest single win available to most people is noticing which one they are actually holding.

From our guides

Browse all articles →

Compressing on Mac Batch Compressing PNGs on a Mac With Automator Build a macOS Quick Action that batch resizes every PNG in a folder, keeping originals intact. 8 min read How PNG compression works How PNG Compression Works Inside every PNG file, a two stage engine filters your pixels then compresses the differences. 5 min read Compressing on Windows How to Compress a PNG in Paint Paint has no compression slider, but two honest levers can shrink any PNG. 5 min read Compressing on Mac How to Compress a PNG on a Mac Preview has no quality slider for PNG. Here is what macOS can and cannot do. 6 min read Compressing on Windows How to Compress a PNG on Windows Open Photos, resize, save as JPEG. Windows has no PNG quality slider. 5 min read Photoshop and GIMP How to Compress a PNG in GIMP The compression slider is lossless. The real savings are in indexed mode. 7 min read Photoshop and GIMP How to Compress a PNG in Photoshop Three Photoshop export routes compared, with the one that shrinks PNGs most. 7 min read How PNG compression works Lossless vs Lossy PNG Compression Choose the right PNG mode and save 70 percent or more without breaking your image. 6 min read

Frequently asked questions

How do I compress a PNG on a Mac?

Open it in Preview, choose File → Export, and reduce the image or export as a different format — or use the tool on this page, which needs nothing installed. The handbook has the full walkthrough including Photos and Automator.

How do I compress a PNG on Windows?

Paint can resize and re-save, and the Photos app can resize with a quality slider. Neither offers real palette reduction, which is where an online compressor does better. Windows 10 and 11 both work the same way here.

How do I compress a PNG in Photoshop?

Use File → Export → Export As, select PNG, and enable Smaller File (8-bit). That switches to a 256-colour palette, which is the same technique this site uses. Save for Web (Legacy) gives finer control.

How much can a PNG compress?

Flat graphics and screenshots commonly lose 60–80%. Lossless optimisation alone yields 5–15%. Photographic PNGs are the poor case and are better converted to WebP or JPEG.

Should I compress PNGs at all?

For anything on the web, yes — images are usually the heaviest thing on a page. For archival masters or print originals, keep the untouched file and compress only the copies you publish.