The Portable Document Format (PDF) is a popular format to publish formatted text and documents. There are several different versions of it, some qualifying as an Open Standard, some certified by ISO and some encumbered by software patents. You might want to promote the versions that are Open Standards, because Open Standards guarantee interoperability, competition and choice. Read more...
There are many programs to read and write PDF documents. The following list of PDF readers is vendor neutral. All of them are Free Software, respecting your basic four freedoms to use, study share and improve them. This gives you control over your computer and helps protect your privacy. Read more...
| Windows | MacOSX | Free Operating Systems [1] | |
|---|---|---|---|
| Evince | - | - | Download |
| KPDF | - | - | Download |
| MuPDF | Download | - | - |
| Okular | Download | Download | Download |
| Skim | - | Download | - |
| Sumatra PDF | Download | - | - |
| Xpdf | - | - | Download |
| Yap | Download | - | Download |
Other proprietary alternatives to Adobe's PDF reader also exist, but like it, their internal working is a a trade secret and these programs do not respect your right to control your own privacy and data.