Compress PNG
Reduce PNG file size dramatically with smart lossy or lossless optimization — transparency preserved. Drop images below, no sign-up.
- ✓Batch up to 25 MB per file, free
- ✓Lossy & lossless modes with resize
- ✓Also export WebP or AVIF in one pass
Drag & drop images here
JPG, PNG, WebP, AVIF up to 25 MB
Transparency preserved
The alpha channel is kept intact, so logos, icons and overlays stay crisp and transparent.
Private by default
Encrypted uploads, auto-deleted within 24 hours. Nothing is kept or shared.
Full control
Choose lossy or lossless, tune the palette, and resize before you download.
More free tools
All free, all private. Pick the right one for the job.
How to compress a PNG online
PNG is perfect for graphics, logos and screenshots with sharp edges or transparency — but the files get heavy fast. OctoSqueeze reduces the color palette intelligently and strips unused data, often cutting PNG size by 50–70% with no visible difference.
Why smaller PNGs matter
Lighter images load faster, improve your Core Web Vitals, and save bandwidth for you and your visitors. On mobile especially, a heavy graphic can be the difference between a bounce and a conversion.
Lossy vs. lossless
Lossless PNG optimization is pixel-perfect; lossy palette reduction goes much smaller with barely any visible change. Compressing photographs instead? Reach for JPEG compression.
Do it at scale
Compressing one image is easy. Compressing thousands is what our REST API is for — one call returns an optimized file (or a CDN URL) in any format you need.
Frequently asked questions
Everything you need to know about compressing PNG images.
Contact supportPNG compression works by reducing the color palette and optimizing the internal data structure. Our algorithm analyzes each image and applies the best combination of lossless and lossy techniques to achieve maximum size reduction while preserving visual quality and transparency.
Yes. Our PNG compressor fully preserves the alpha channel (transparency). Your logos, icons, and graphics will retain their transparent backgrounds after compression.
Lossless compression reduces file size without any quality loss - the image is pixel-perfect identical. Lossy compression reduces the color palette which achieves much smaller file sizes but may have slight color variations. For most web use, lossy is recommended.
Free users can upload PNG files up to 25MB. Pro and Unlimited plans support files up to 50MB and 100MB respectively. For larger files, consider using our API for server-side processing.