How to Compress PNG Without Losing Quality (Lossless)
PNG is already a lossless format, but most PNGs you encounter are not maximally compressed. Re-encoding through a good optimizer typically shrinks them 30-70% without changing a pixel. Here's how.
Use the tool
Compress PNG
Step-by-step
- 1
Open Compress PNG
Drop your PNG into the dedicated Compress PNG tool.
- 2
Keep dimensions or downscale
For lossless: leave dimensions alone. The compression comes from re-encoding only.
- 3
Optionally cap max dimension
If you don't need full resolution, downscale to your actual display size — biggest savings come from fewer pixels.
- 4
Download
Save the optimized PNG. Compare with the original — most save 40-50%.
💡 Tips
- Logos, screenshots, and graphics with limited colors compress hardest in PNG. Photos in PNG are huge — convert to JPG instead.
- For maximum PNG compression, look at tools like pngquant (lossy 8-bit palette) — drops file size dramatically with barely-visible color loss.
- If your image will be re-saved by another tool downstream, no point optimizing — it'll get re-encoded anyway.
FAQ
How is "lossless" possible on already-compressed PNG?
PNG's built-in compression has many parameter choices. Most encoders pick fast defaults; aggressive re-encoding finds smaller representations of the exact same pixel data.
Will animated PNGs (APNG) work?
Standard PNG tools strip animation. For APNG, look for an APNG-specific optimizer.
When should I switch to WebP instead?
WebP lossless is typically 25-30% smaller than PNG with no quality difference. Use WebP if your audience is on modern browsers (95%+ support).
Disclaimer. This guide is for general informational purposes. Our tools run entirely in your browser and process files on your device, so exact results depend on your image, browser, and the settings you choose. Read our editorial policy.