Compress PNG Images
Compress PNG images by up to 80% with smart colour quantization, keeping transparency. Batch, free, no sign-up, no upload.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Compress PNG
- Select PNG images.
- Adjust quality (fewer colours = smaller file).
- Download the compressed PNGs.
PNG files from screenshots and design tools are often several megabytes. FreePDF reduces them with palette quantization (like TinyPNG) right in your browser – no upload limits, no daily quota and full transparency support.
Common uses
- Speed up a website by shrinking PNG graphics.
- Fit screenshots under email or upload size limits.
- Optimise app icons and UI assets.
- Reduce storage for large image collections.
Tips for best results
- Quality 70 is a good balance; go lower for flat graphics and icons.
- Set a max width to also resize large screenshots.
- Photos are often smaller as WebP or JPG – change format if transparency is not needed.
Why use FreePDF for Compress PNG?
| FreePDF | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Frequently asked questions
How can PNG get smaller without losing quality?
Most PNGs use far fewer than 16 million colours. Quantizing to an optimal 256-colour (or smaller) palette shrinks files dramatically while looking virtually identical, and transparency is preserved.
Will it ever make my file bigger?
No – if the result would be larger, the original is kept.
Is there a file limit?
No limits on number of files.
Is my image uploaded?
No.
Is Compress PNG really free?
Yes. Every tool on FreePDF is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. FreePDF processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. FreePDF works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.