Reduce PNG file size by up to 80% without any visible quality difference — ideal for web pages, email, and app assets.
Lossy vs lossless PNG compression
PNG is a lossless format by design — every pixel is stored exactly. However, you can significantly reduce a PNG's file size through two methods:
- Lossless compression — removes metadata and optimises the internal data structure. File size drops 10–30% with zero visual change.
- Quantization (lossy-looking but still PNG) — reduces the colour palette from 16 million to 256 colours. File size drops 50–80%, often with no visible difference for solid-colour graphics, logos or screenshots.
Photographs should use JPEG or WebP. PNG compression gives the best results for logos, icons, screenshots, and graphics with flat colours.
How to compress a PNG online (step by step)
- 1
Open the Image Compressor
Go to Free Tool Flow → Image Tools → Image Compressor. No account is required.
- 2
Upload your PNG
Click 'Choose File' or drag and drop your PNG. Files up to several MB are handled instantly.
- 3
Set the quality slider
Start at 80%. For logos and screenshots, you can often go as low as 60% without any visible change.
- 4
Preview the result
The tool shows the original size vs the compressed size and a live preview. Zoom in to check for artefacts.
- 5
Download the compressed PNG
Click 'Download'. The compressed file saves locally — nothing is sent to our servers.
How much can you reduce a PNG file?
| Image type | Expected reduction | Visible quality loss? |
|---|---|---|
| Logo / icon | 60–80% | None |
| Screenshot (UI) | 40–70% | None |
| Illustration (flat) | 50–75% | None |
| Photograph (saved as PNG) | 20–40% | Minimal |
| Gradient-heavy graphic | 15–30% | Slight banding possible |
Should you use PNG or WebP for the web?
Modern browsers support WebP, which offers better compression than PNG at the same quality. If you are optimising images for a website, consider converting your PNG to WebP using our JPG to WebP or PNG to WebP converter — you will typically save an additional 25–35% on top of PNG compression.
Frequently asked questions
Can I compress a PNG without losing quality?
Yes. Lossless PNG compression removes metadata and optimises internal data without changing a single pixel. Using Free Tool Flow's Image Compressor at quality 75–85% typically reduces file size 50–80% with no visible quality change for logos, icons, and screenshots.
What is the best free PNG compressor online?
Free Tool Flow's Image Compressor runs in your browser — no server upload, no account, no watermark. It uses the browser-image-compression library to reduce PNG sizes instantly.
Does compressing a PNG reduce its resolution?
No. Compression reduces file size by removing redundant data, not by changing the pixel dimensions. Your image stays at the same width and height.
Is there a file size limit for PNG compression?
There is no hard limit. Files are processed in your browser's memory; very large PNGs (50 MB+) may be slower on lower-powered devices.