Compress PNG Images Online
PNG files are known for their lossless quality and transparency support, but that quality comes with a cost: large file sizes. Our free PNG compressor reduces PNG file sizes significantly, making images faster to load on websites and easier to share — without any visible quality loss.
How to Compress PNG
-
Upload your PNG
Drag and drop your PNG files onto the upload area, or click to browse your device. You can upload up to 20 images at once.
-
Adjust compression level
Choose your compression level — from light (preserve maximum quality) to aggressive (smallest file size). You'll see a real-time preview of the result.
-
Download compressed PNG
Click Download to save your compressed PNG. Batch downloads are packaged as a ZIP file for convenience.
Features
- Process entirely in your browser — images never uploaded to our servers
- Compress multiple PNG files at once
- Before/after file size comparison
- Preserves PNG transparency (alpha channel)
- No sign-up or account required
- Completely free, no watermarks
Why Compress PNG Images?
Smaller PNG files mean faster-loading web pages, better Google PageSpeed scores, lower hosting bandwidth costs, and quicker file sharing. A PNG image that loads in 0.1 seconds provides a far better user experience than one that takes 2 seconds. For e-commerce sites, faster images directly translate to higher conversion rates.
PNG Compression: Lossless vs Lossy
PNG is inherently a lossless format, meaning every pixel is stored exactly as-is. Standard PNG compression works by finding repeated patterns in the image data — the more repetition, the smaller the file. For photographic images with millions of unique colors, PNG is often less efficient than JPG or WebP. For graphics, logos, screenshots, and illustrations with flat colors and sharp edges, PNG compression can achieve significant reductions while keeping the image pixel-perfect.
Supported Formats
This tool accepts PNG files up to 20 MB per file. Process up to 20 images per batch.
Frequently Asked Questions
-
Standard lossless PNG compression does not reduce visual quality — the image looks identical before and after. Our tool applies optimization techniques that reduce file size without changing any pixels. However, if you apply very aggressive compression that removes color information, there may be a small, often imperceptible quality trade-off.
-
No. Our PNG compressor preserves the alpha channel (transparency) in your images. Your transparent areas will remain transparent after compression.
-
Results vary depending on the image content. Simple graphics with flat colors and large uniform areas compress best — sometimes 50–70% reduction. Photographs saved as PNG typically compress much less. For photos, consider converting to WebP for dramatic file size reductions while maintaining quality.
-
You can compress up to 20 PNG images per batch, with each file up to 20 MB. For larger batches, simply repeat the process.
-
Your images are processed entirely in your browser using the Canvas API. They are never sent to our servers. Once you close the browser tab, the images are gone from memory.
-
Our browser-based tool processes standard static PNG images. Animated PNG (APNG) compression requires specialized server-side tools and is not currently supported.