How to Compress a PNG Image Online
You can compress a PNG online by re-encoding it in your browser with MiniFyPNG’s free PNG compressor — transparency stays intact, and the file is not uploaded to a MiniFy server for this tool.
Shrink a PNG in your browser with MiniFyPNG — without uploading the file to a server.
PNG is lossless and often keeps transparency, so size reduction comes from re-encoding rather than JPEG-style quality loss. MiniFyPNG’s PNG compressor runs entirely in the browser: you drop a static PNG, compare real byte sizes, and download the result. Animated PNG is rejected with a clear message.
What is PNG compression?
PNG compression reduces a PNG’s file size without switching to a lossy format like JPG. Because PNG is lossless, savings come from how the image is filtered and packed — results vary, and not every PNG shrinks dramatically.
Steps to compress a PNG with MiniFyPNG
- 1
Open the PNG compressor
Go to the free PNG compressor. Output is locked to PNG so transparency stays intact.
- 2
Add a static PNG
Drop a PNG or choose a file. You’ll see the name, dimensions, and exact original size before anything is processed.
- 3
Start compression
Compression uses the browser canvas on your device. Nothing is uploaded to MiniFy servers for this tool.
- 4
Compare the real sizes
Original and compressed sizes appear as proportional bars with the true savings percentage — not an estimate.
- 5
Download or try again
Download the optimized PNG, or remove the file and try another. Results vary by image complexity.
Examples of when PNG compression helps
- A UI icon or logo with transparency that needs a smaller PNG for a design system or email template.
- A screenshot or flat graphic where you must keep PNG (not JPG) but want a lighter file for upload limits.
PNG compression FAQ
Will every PNG get much smaller?
No. Some PNGs are already well optimized. MiniFyPNG always shows the real output size so you can decide whether to keep it.
Does compression remove transparency?
No on this tool. Output stays PNG, so alpha is preserved when the source has transparency.
Why not just save as JPG?
JPG cannot store transparency and uses lossy compression. Prefer JPG or WebP for photos; keep PNG for graphics that need sharp edges or alpha.
Are my images uploaded?
No. This workflow runs in your browser. Files stay on your device for this tool.