pngquant is dual-licensed under GPL and a commercial license, and additionally requires attribution of the original pngquant authors. Files generated by pngquant are not affected by the license.
The commercial pngquant license covers a bundle of pngquant, libimagequant, and gif.ski.
Sample commercial license document. We're open to negotiating the terms and scope of the agreement, e.g. if you'd like the license to clarify whether certain uses and distribution methods are in scope, or need additional clauses to comply with your regional regulations.
Pricing is based on size of the company purchasing the license. It must be the company that owns copyright to the combined product (e.g. if you're a subcontractor purchasing the license, purchase it for the client who will own the software).
| 1 - 9 People | $950.00 / year |
|---|---|
| 10 - 49 People | $1,250.00 / year |
| 50 - 99 People | $1,650.00 / year |
| 100 - 249 People | $2,450.00 / year |
| 250 - 499 People | $3,950.00 / year |
| 500 - 999 People | $9,950.00 / year |
| 1,000 - 2,999 People | $15,950.00 / year |
| More than 3,000 People | $25,500.00 / year |
There is an option to purchase a perpetual license.
You can purchase an annual license immediately via supso.org. If you'd like other licensing terms, specific format of an invoice, pay via bank transfer, etc., contact us.
pngquant is licensed by ImageOptim Ltd., a company incorporated and registered in England and Wales under company number 10288649 whose registered office is at International House, 142 Cromwell Road, London, England, SW7 4EF.