Free PNG Image Compression Without Uploading
PNG image compression reduces the amount of data stored in a PNG file so the image can load faster and take up less storage space. Our free PNG compressor works directly in your browser, making it easy to compress PNG files online without sending your images to a server.
If you need to reduce PNG file size without changing image dimensions, this tool is designed for that workflow. It keeps the original width and height while optimizing the image data through color quantization. You can compare the original and compressed image before downloading the optimized PNG.
Compress PNG Images Without Changing Dimensions
Many image optimization tasks require a smaller file but the same pixel dimensions. PNG compression is different from image resizing: resizing changes width and height, while compression focuses on reducing the amount of data required to represent the image. This makes the tool useful for website images, transparent logos, app assets, interface graphics, and digital illustrations.
Lossy PNG Compression for Smaller File Sizes
This compressor uses lossy PNG compression through UPNG.js and color quantization. The default setting uses 128 colors, while the adjustment slider lets you choose a smaller or larger palette. Fewer colors can produce a smaller PNG, although the visual appearance may change more noticeably on detailed images.
The actual reduction depends on the source image. Simple graphics, illustrations, screenshots, and images with broad areas of similar colors may compress differently from photographs or highly detailed artwork. The before-and-after size information lets you verify the result before downloading.
PNG Compression That Preserves Transparency
PNG is commonly used for graphics that need transparent backgrounds. The compressor preserves the PNG alpha channel, so transparent areas can remain transparent after optimization. This is particularly useful when you need to compress transparent PNG images such as logos, icons, overlays, and UI elements.
Why Compress PNG Files Locally?
- No server upload: PNG processing happens directly in your browser's memory.
- Faster workflow: You can avoid uploading an image and waiting for a remote processing service.
- Privacy-focused: Local processing is useful for confidential design files and unreleased assets.
- Keep dimensions: Compression can reduce file size without resizing the image.
- Transparent PNG support: The alpha channel is preserved for transparent graphics.
Frequently Asked Questions About PNG Image Compression
How to Compress a PNG Image Online
- Select a PNG image from your device or drag it into the upload area.
- Let the browser compress the image using the default smart compression setting.
- Compare the original and compressed PNG with the before-and-after slider.
- Adjust the color setting if you want a smaller file size.
- Download the compressed PNG when you are satisfied with the result.