PNG Compressor
Choose a dimension scale to shrink your PNG's file size while fully preserving transparency, then download the result — free, private, and processed entirely in your browser.
About the PNG Compressor
Our free online PNG compressor shrinks the file size of PNG images while keeping crisp edges and full alpha channel transparency — ideal for logos, icons, and other web graphics where quality and transparency matter. Choose a dimension scale to reduce the file size, and see exactly how much space you saved.
Unlike most online tools, compression happens entirely inside your browser using the HTML5 Canvas API — your image is never uploaded to a server. That means it's fast, works without an internet round-trip, and keeps your files completely private and secure.
How to Compress a PNG
Step 1
Upload your PNG image
Drag and drop a .png file, or choose one from your device.
Step 2
Select your dimension scale
Choose 100%, 75%, 50%, or 25% to control how much the file size shrinks.
Step 3
Compress and download
Click "Compress PNG" and download your optimized image instantly.
Frequently Asked Questions
Does compressing PNG remove transparency?
No. Alpha channel transparency is fully preserved — the canvas is cleared before drawing, so any transparent areas in your original PNG stay transparent in the compressed version.
Is my image uploaded to any server?
No. All compression is performed 100% locally in your browser using the HTML5 Canvas API — your image never leaves your device.
Why does scaling down help compress a PNG?
PNG is a lossless format, so browsers don't offer a quality slider for it — the main way to meaningfully shrink a PNG's file size is to reduce its pixel dimensions, which is exactly what the scale options do.
Will my image look blurry after compressing?
At 100% scale, the image is re-encoded at full resolution with no quality loss. Scaling down to 75%, 50%, or 25% reduces the pixel dimensions, which is only noticeable if you display the result larger than its new size.
Does it cost money?
No. The PNG compressor is 100% free to use, with no registration or account required.