Compress PNG
Reduce PNG file size dramatically with lossy or lossless optimization — transparency preserved. Drop images below, no sign-up.
- ✓Up to 10 files, 20 MB each, free
- ✓Lossy & lossless modes with resize
- ✓Also export WebP or AVIF in one pass
Drag & drop images here
up to 10 images: JPG, PNG, WebP, HEIC, 20 MB each
Transparency preserved
The alpha channel is kept intact, so logos, icons and overlays stay crisp and transparent.
Private by default
Encrypted in transit, auto-deleted within 7 days. 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 and strips unused data; how much smaller the file gets depends on the image, and every result shows the saving.
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 a download link for each optimized file, 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. OctoSqueeze applies a lossy palette reduction or a lossless optimization, depending on the mode you choose, and keeps transparency intact.
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.
The free web uploader takes PNG files up to 20 MB. Pro and Unlimited plans support files up to 50 MB and 100 MB respectively. For larger files, consider using our API for server-side processing.