Compress a PNG without losing image data
Optimize a PNG for storage, websites, or sharing without reducing its pixel dimensions or intentionally discarding image data.
NetroDoc uses maximum PNG compression and returns the original file when the optimized version would be larger.
How to compress a PNG
Upload the PNG
Choose one valid, single-frame PNG image.
Optimize the file
NetroDoc applies lossless PNG optimization.
Download the PNG
Save the smaller result or the unchanged original when it is already optimal.
What lossless PNG compression changes
PNG pixels and supported transparency are preserved. Compression reorganizes how the image data is stored rather than lowering a quality setting.
Results vary because some PNG files are already highly optimized. Animated PNG files are rejected instead of silently losing frames.
When to compress PNG
Transparent graphics
Reduce logos or interface graphics while preserving transparency.
Screenshots
Optimize screenshots without JPEG artifacts.
Asset storage
Avoid keeping a larger re-encoded copy when no reduction is possible.
Temporary server-side processing
The uploaded image is processed in a temporary working directory and is not intentionally sent to a third-party conversion API.
Temporary files are removed after the response is completed or when processing fails. No account is required.
Privacy →Compress PNG FAQ
Is the compression lossless?
Yes. NetroDoc does not intentionally discard PNG pixel data.
Is transparency preserved?
Yes, supported alpha transparency is retained.
Why is my file unchanged?
The original is returned when the optimized PNG would not be smaller.