Compress PNG

What this compressor actually does

The browser decodes each static PNG into a canvas and encodes the rendered pixels as a new PNG. Full colour keeps 8-bit RGB precision. The 6-, 5-, and 4-bit settings round the red, green, and blue channels to fewer levels, which can help flat artwork compress but may introduce banding. Alpha values are not rounded by that control. If you resize, canvas interpolation can change both colour and alpha around edges.

This is not an oxipng filter search or a pngquant indexed-palette encoder. A browser-generated PNG can be larger than its source. With full colour and unchanged dimensions, the tool returns the original file whenever that file is already smaller. In that case its original metadata is also retained.

Limits and privacy

• Up to 10 PNG files, 20 MB each and 50 MB in total
• Up to 24 megapixels and 8192 pixels on either side
• Generated output is limited to 50 MB per PNG and 100 MB per batch
• Static PNG only; APNG animation is rejected rather than reduced to one frame
• Files are processed locally and never sent through Livewire or an upload endpoint
• In the four-step flow, files can be restored for 30 minutes. An active page removes them after expiry; if the page was closed or suspended, the next multi-step visit removes expired or malformed records

Canvas re-encoding can remove metadata and can change how an embedded colour profile is interpreted. It preserves the browser-rendered appearance, not the original encoded samples or ancillary chunks bit for bit.