Compress PNG Images Online
Reduce PNG file sizes with lossless compression. Free, private, and instant.
Drag & drop images here
or click to browse
PNG, JPG, JPEG, WebP, AVIF, HEIC, BMP, GIF
Quality
PNG uses lossless compression — the quality slider is disabled because PNG always preserves full image quality. To reduce file size further, try resizing the image or switching to JPG/WebP format.
Resize
Output Format
Before / After
How PNG Compression Works
PNG (Portable Network Graphics) is a lossless image format that preserves every pixel and supports full alpha transparency — ideal for logos, UI assets, screenshots, and graphics with sharp edges. Because PNG stores more detail than lossy formats like JPEG, files can grow large quickly, especially for photographs or high-resolution artwork.
Good PNG compression re-encodes the image more efficiently while keeping the same visual result. You retain transparency and crisp lines without noticeable quality loss. For photographs or complex gradients where transparency is not needed, consider compressing as JPG or converting to WebP for even smaller files.
How to Compress PNG Images Online
- Upload your PNG — drag and drop files into the upload area, or click to browse. You can add multiple PNGs at once.
- Adjust quality — use the quality slider to balance file size and visual fidelity. For most web use, 70–85% works well.
- Preview and compare — click any result to open a side-by-side before/after view with zoom.
- Download — save individual files or use bulk download as ZIP for multiple images.
When to Use PNG vs JPG vs WebP
Choose PNG when you need transparency (logos, icons, overlays) or pixel-perfect reproduction of flat graphics and text. Use JPG for photographs where slight lossy compression is acceptable and file size matters. WebP is the modern alternative that supports both transparency and lossy compression with smaller file sizes than either PNG or JPG — ideal for web performance. For a deeper comparison, see our guide on PNG vs JPG vs WebP.
Tips for Smaller PNG Files
- Resize first — shrink oversized dimensions before compressing. A 4000px photo scaled to 1200px can drop from 5 MB to under 500 KB.
- Remove unused transparency — if your PNG has large transparent margins, cropping them out reduces file size significantly.
- Use fewer colors — simple graphics with flat colors compress much better as PNG than photographs with millions of color variations.
- Consider WebP output — this tool lets you convert PNG to WebP in one step for 25–50% additional savings while keeping transparency.
Frequently Asked Questions
How much can I compress a PNG file?
Typically you can reduce PNG file size by 50–80% without visible quality loss. Results depend on the image content — photos compress more than flat graphics.
Does compressing PNG remove transparency?
No. When you compress as PNG, transparency is fully preserved. If you convert to JPG, transparency is replaced with a white background.
Can I compress PNG files in bulk?
Yes! Drop multiple PNG files at once, adjust settings, then click Compress All. Download everything as a ZIP file.
What is the best quality setting for PNG?
For web use, 70–85% quality provides an excellent balance between file size and visual fidelity. For logos and graphics with sharp edges, use 90–100%.
Are my PNG files uploaded to a server?
No. CompressEazy processes everything in your browser using HTML5 Canvas. Your images never leave your device — no upload, no server, no data collection.
This tool works offline — install CompressEazy as an app on any device.