Compress PNG Files Online — Keep Transparency Intact

PNG files preserve sharp edges and transparency, but they can be surprisingly heavy. Screenshots, design exports, and UI assets often weigh several megabytes each. This tool applies optimized compression that strips redundant data from your PNGs without touching the visible pixels or alpha channel. The result is a noticeably smaller file that looks exactly the same. Processing happens entirely in your browser, so sensitive designs and screenshots stay on your machine.

Compression Level:80%

Drop PNG files here or click to browse

Accepts .png files only

How It Works

Upload Your PNG Images

Drag and drop PNG files into the upload area. Screenshots, logos, icons, and illustrations with transparency are all supported.

Adjust Compression Level

Move the slider to control how aggressively the file size is reduced. PNG compression reduces redundant pixel data while preserving every detail in the output.

Save Your Optimized PNGs

Download each compressed file individually or use the batch download option. Transparent areas remain fully intact after compression.

Frequently Asked Questions

Does compressing a PNG remove its transparency?

No. PNG transparency is stored in the alpha channel, which is preserved during compression. Whether your image has a fully transparent background or semi-transparent overlays, the compressed output will look identical. This makes PNG compression safe for logos, UI elements, and any graphic that relies on transparency.

What is the difference between PNG-8 and PNG-24?

PNG-8 stores up to 256 colors using an indexed palette, resulting in very small files ideal for simple graphics and icons. PNG-24 supports over 16 million colors and is better suited for photographs or complex gradients. If your image has few colors, converting to PNG-8 before compression can yield dramatically smaller files.

Why are my PNG screenshots so large?

Screenshots capture every pixel on your screen at full color depth, and PNG stores all that data losslessly. A single 1920x1080 screenshot can easily exceed 2 MB. Compression reduces this by finding repeated patterns in the pixel data, which is especially effective for screenshots containing large blocks of uniform color like toolbars and backgrounds.

How does PNG compression differ from JPEG compression?

PNG uses lossless compression, meaning the decompressed image is bit-for-bit identical to the original. JPEG uses lossy compression that permanently discards some color information. This is why PNG is preferred for graphics with sharp edges, text, and transparency, while JPEG is better for photographs where slight quality loss is acceptable in exchange for much smaller files.

Can I compress PNG files without uploading them anywhere?

Yes. This tool processes everything inside your browser using JavaScript. Your PNG files are read directly from your device, compressed in memory, and the result is offered as a download. No data is transmitted over the network. You can disconnect from the internet after loading this page and the compressor will continue to work.

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