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
50MB max file size
100% free forever

Drop your PNG files here

or click to select files from your computer

Up to 10 PNG files  |  max 50 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. PNG Optimizer applies smart lossy compression that reduces file sizes by up to 80% while keeping images looking virtually identical - meaning faster page loads, better 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 for faster publishing - PNG Optimizer 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? for even smaller file sizes, or 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 10 PNG files of up to 50 MB each 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. Three files compress at a time and the rest start automatically as slots free up - watch the progress bars and thumbnails update in real time.
  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 10 PNG files at once, each as large as 50 MB. Three upload at a time so nothing stalls on a slow connection, and the queue advances by itself. 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.

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

Frequently Asked Questions

PNG Optimizer 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 50 MB in size - far more than most free compressors allow. You can upload and compress up to 10 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.

Yes. PNG Optimizer accepts PNG files up to 50 MB each, so full-page screenshots, scans, game textures, and high-resolution exports are all handled. Large files naturally take longer - three upload at a time and the rest wait their turn, so keep the tab open until the Download button appears. If a big file keeps failing, please and we'll take a look.

Absolutely. PNG Optimizer 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 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.

How fast were your PNGs optimized?