PNG Compressor
Compress PNG images in bulk without sacrificing transparency. Reduce palette size and dimensions entirely in your browser without uploading files to a server.
JPG, PNG, WebP · up to 50 files
Quality
Longest side
Format
Tips
- Most PNG size savings come from reducing palette depth, which remains visually lossless on screenshots and UI graphics.
- If a compressed result ends up larger than the input, the tool automatically keeps your original file intact.
- For complex photographic graphics, converting to WebP delivers significantly smaller files than standard PNG compression.
How to use it
- 1 Select or drag and drop your PNG images into the processing area.
- 2 Adjust the compression strength or set maximum dimension boundaries to control file weight.
- 3 Review the resulting file savings and download your optimized PNG files individually or together.
What you should know
PNG files store pixel data losslessly using Deflate compression across 24-bit RGB or 32-bit RGBA channels. While this preserves crisp line art and alpha transparency, raw photographic elements inflate file sizes compared to lossy alternatives. True size reduction in PNG relies on color quantization, which converts 24-bit truecolor data into an indexed 8-bit palette containing up to 256 optimized colors. This step dramatically cuts file payloads by stripping redundant color variations while preserving full alpha channel gradients, making it ideal for web graphics, UI icons, and software screenshots that demand sharp edges without slow loading times.
This tool processes your PNG files locally via WebAssembly and HTML5 canvas APIs, eliminating server uploads entirely. You can batch compress multiple assets, set maximum dimension bounds, and fine-tune palette depth to shrink assets for web deployment or marketplace listings on platforms like Shopify and Trendyol, the largest marketplace in Turkey. The engine preserves alpha channel transparency across all export profiles. Non-essential ancillary chunks such as EXIF data, color profiles, and creation timestamps are stripped to conserve bytes, while original image files remain untouched if compression fails to yield a smaller footprint.
Frequently asked questions
Will compressing a PNG remove its transparent background?
No. The compression algorithm fully preserves alpha channel transparency, ensuring clean edges on any background.
Why did some PNG files not decrease in size?
Images that already use an optimized 8-bit indexed palette cannot be reduced further without resizing. When compression produces a larger file, the tool automatically retains your original asset.
Are my PNG files uploaded to an external server?
No. All compression routines execute entirely within your browser memory, meaning your image data never leaves your device.
Guides
Articles and format references related to this tool.
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