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 calculator
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).