What does this tool do?
| Direct answer | Compress PNG re-encodes your image and shows before/after sizes, all locally. |
| Key fact | PNG is lossless; canvas re-encoding achieves size cuts via palette and filter choices. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Drop a PNG into the box.
- Adjust quality (affects re-encode).
- Click Run to compare sizes.
Example
Input
screenshot.png (2.4 MB)
Output
compressed.png (780 KB — 67% smaller)
Who is this for?
This tool was built for people who need a fast answer in the browser — no install, no account, no data leaving the device.
Web developers optimizing images for Core Web Vitals, designers preparing assets, and bloggers shrinking photos — files never leave your device.
Frequently asked questions
Is PNG compression lossy?
PNG format is lossless — savings come from re-encoding, not discarding data.
Why is my file sometimes bigger?
Already-optimized PNGs can grow slightly on re-encode; the tool shows the delta.
Does it strip transparency?
No — PNG alpha is preserved.