Free PNG Optimizer

Compress. Optimize. Deliver.

Reduce PNG file sizes by up to 80%, resize in bulk, and download as a ZIP archive - no signup, no limits, completely free.

80% size reduction
20 files / batch
100% free forever

Drop your PNG files here

or click to select files from your computer

Up to 20 PNG files  |  max 20 MB each  |  ZIP download for 3+ files

Quality: Balanced (75%) - Original size

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 - 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 web 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 direct ranking factor, and unoptimized images are one of the biggest performance bottlenecks. Compressing your PNGs dramatically improves load times without sacrificing visual 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 Online - Step by Step

  1. Drag and drop up to 20 PNG files into the upload area above, or click "Browse Files" to select them from your computer or device.
  2. Optionally click "Customize Settings" to choose a quality preset (Max, High, Balanced, Small, Tiny) or set a custom resize dimension using a quick preset or manual width/height input.
  3. Each file compresses automatically in parallel - watch the progress bars and thumbnails update in real time as compression runs.
  4. Download compressed files individually with the Download button, or click "Download ZIP" when you have 3 or more completed files to save them all at once.

Batch Compression & ZIP Download

Upload up to 20 PNG files at once and 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, social media graphics, or entire image folders.

All processing happens securely on our servers. Your original files are never shared and are automatically deleted after processing.

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. We recommend the "Balanced" preset for the best results on web images.

Yes. Your uploaded files are processed on our secure 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. Your privacy is fully protected.

Each PNG file can be up to 20 MB in size. You can upload and compress up to 20 files at once for batch processing. When you have 3 or more compressed files, you can download them all as a single ZIP archive with one click.

Absolutely. OptimizePNG fully preserves alpha transparency. The compressed PNG output maintains all transparency information, making it perfect for logos, icons, and web graphics that need transparent backgrounds. 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 the top priority.

Compress PNG reduces file size using smart lossy compression while preserving color depth and full transparency. PNG to 8-Bit specifically converts your image to an indexed 8-bit palette (maximum 256 colors), which is ideal for graphics, logos, and icons with limited colors. For full-color photos, use the Compress PNG tool instead.