Optimize · Browser-first processing
Use this for screenshots and graphics where you want a clean PNG reconstruction rather than lossy quality reduction.
Select a supported file or enter the requested values, then run the tool.
Closing or refreshing this page clears the selected files and generated result. Downloaded files are created as new copies and never overwrite the source.
Common questions
Lossless PNG Optimizer reads the selected input into browser memory and performs its documented operation on this device. It does not submit the source file to ImgNimble while using this browser-first workspace.
A freshly encoded PNG with the same canvas dimensions and pixel colours.
Colour-management chunks and metadata may be removed. Pixel values are preserved after browser decoding, but the binary file will not match byte-for-byte.
Practical checks
Use this for screenshots and graphics where you want a clean PNG reconstruction rather than lossy quality reduction.
Keep the source, download the Lossless PNG Optimizer result as a new file, and verify dimensions, transparency, colour, metadata and visual detail before replacing any production asset.
Continue the workflow
Re-encode an image locally to remove EXIF, GPS and most ancillary metadata before sharing.
Compress JPEG, PNG and WebP images locally with a quality slider and an exact before-and-after file-size report.
Turn an image into a black-and-white or alpha mask using an adjustable luminance threshold.