Compress. Deliver.
Reduce PNG file sizes by up to 80%, resize in bulk, and download as a ZIP archive. No signup required.
Drop your PNG files here
or click to select files from your computer
Up to 20 images — max 20 MB each — ZIP download for 3+ files
Drop to compress
What is PNG Compression?
PNG (Portable Network Graphics) is the most widely used lossless image format on the web, but raw PNG files can be unnecessarily large. OptimizePNG applies smart lossy compression that reduces file sizes by up to 80% while keeping images looking virtually identical to the originals - meaning faster page loads, better Core Web Vitals scores, and lower bandwidth costs.
Optimized PNGs preserve full alpha transparency and work in every modern browser and editor. Whether you are a developer optimizing assets, a designer preparing graphics, or a blogger compressing images for faster publishing - OptimizePNG handles it with zero configuration.
Why Compress PNG Files?
Large PNG files slow down your website and hurt search rankings. Google uses page speed as a ranking factor, and unoptimized images are one of the biggest performance bottlenecks. Compressing your PNGs dramatically improves load times without sacrificing quality, and also reduces storage and bandwidth costs.
Need to go further? Convert PNG to WebP for even smaller file sizes, or convert PNG to JPG when you do not need transparency. For 256-color images try our PNG to 8-Bit converter.
How to Compress PNG Files
- Drag and drop up to 20 PNG files into the upload area, or click "Browse Files" to select from your computer.
- Choose a quality preset (Max, High, Balanced, Small, Tiny) or fine-tune with the slider. Optionally set a custom resize dimension.
- Each file compresses automatically - watch the progress bars and thumbnails update in real time.
- Download files individually, or click "Download ZIP" when you have 3 or more completed files.
Batch Compression & ZIP Download
Upload up to 20 PNG files at once - they all compress simultaneously in parallel. When you have 3 or more completed files, the "Download ZIP" button appears giving you a single archive with all compressed images plus a summary file. Perfect for batch-optimizing website assets, app icons, or entire image folders.
Related Image Tools
Frequently Asked Questions
OptimizePNG uses smart lossy compression that is virtually indistinguishable from the original. It reduces colors intelligently while preserving visual appearance. For most images, the difference is imperceptible even at close zoom levels.
Yes. Your uploaded files are processed on our server and automatically deleted within 10 days (usually within hours). We do not store, share, or analyze your images. No account or signup is required.
Each PNG file can be up to 20 MB. You can upload up to 20 files at once for batch compression. When you compress 3 or more files, you can download them all as a single ZIP archive.
Absolutely. OptimizePNG fully preserves alpha transparency. The compressed output maintains all transparency information, making it perfect for logos, icons, and web graphics. You can also convert PNG to ICO while keeping transparency intact.
Max (95%) - barely any compression, best for print or archiving. High (85%) - excellent quality with noticeable size reduction. Balanced (75%) - recommended for most web images. Small (60%) - strong compression for thumbnails or previews. Tiny (40%) - maximum compression, ideal when file size is critical.
Compress PNG reduces file size using smart lossy compression while preserving color depth. PNG to 8-Bit specifically converts your image to an indexed 8-bit palette (max 256 colors), which is ideal for graphics, logos, and icons with limited colors. For full-color photos, use Compress PNG instead.