PNG is a lossless format: perfect for editing, terrible for publishing. The most effective way to compress a PNG is re-encoding it as WebP, which keeps transparency and turns a 1.5 MB screenshot into under 150 KB at 75–85% quality. That is exactly this page’s default.
If you must keep the .png extension (platform requirements), use the resizer instead: reducing dimensions is the only effective size cut PNG allows in the browser without changing format.
How it works
- 1
Drop your PNGs into the upload zone.
- 2
Keep WebP as the output to preserve transparency.
- 3
Compare the savings and download your files.
Frequently asked questions
Are my screenshots uploaded to a server?
No. All processing happens inside your browser using the Canvas API: your files never leave your device, there are no upload queues, and the tool even works offline once the page has loaded.
Do I lose transparency when compressing a PNG?
Not if you pick WebP as the output: it supports an alpha channel just like PNG. Only JPEG replaces transparency with a white background.
How much can I expect to save?
Between 60% and 90% for screenshots and graphics. For photos mistakenly saved as PNG, savings can exceed 90% with no visible difference.