Compress PNG Online Free
Reduce PNG file sizes while keeping transparency and quality. Everything runs locally in your browser — your images never leave your device.
Drop images here
or click to browse — JPEG, PNG, WebP
How to Compress PNG Files
1
Upload PNG
Drag and drop your PNG images — or click to browse. Transparency is preserved.
2
Adjust Settings
Pick a quality preset or fine-tune the slider. Optionally resize for even smaller files.
3
Download
Your compressed PNG files are ready instantly. Download individually or all at once.
Frequently Asked Questions
How do I reduce the size of a PNG file?
Upload your PNG file to SlimPix, adjust the quality slider to your preferred level, and click Compress. SlimPix reduces PNG file sizes while preserving transparency. All processing happens in your browser — no uploads needed.
Does compressing a PNG remove transparency?
When you compress as PNG output, transparency is preserved. If you convert to JPEG during compression, transparency will be replaced with a white background since JPEG does not support alpha channels.
What is the difference between PNG and JPEG compression?
PNG uses lossless compression and supports transparency, making it ideal for graphics, logos, and screenshots. JPEG uses lossy compression optimized for photographs and produces much smaller files. Use PNG when you need transparency or pixel-perfect graphics.
Can I compress PNG files in bulk?
Yes. SlimPix supports batch PNG compression. Select or drag-and-drop multiple PNG files, configure your settings once, and compress them all together. Download individually or all at once.