Okular
KDE
Download from the vendor
okular.kde.org
A document viewer that handles PDF, EPUB, DjVu, Markdown and images. In annotation mode you add notes, highlights, underlines and free text to PDFs. It can check digital signatures in a file, confirm they are valid and detect changes made after signing, and can also sign documents. Useful for reviewing contracts, approvals and signed drawings. On Windows the recommended installation is through the Microsoft Store.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | Open-source licence (GPL-2.0). Free for any purpose including commercial work, with no time limit, no registration and no licence key. Only experimental nightly builds exist for macOS. |
| Platforms | Linux, Windows |
| Engineering field | Architecture, Civil Engineering, Electrical & Electronics, Mechanical Engineering |
| Tool type | General Productivity |
| Vendor site | okular.kde.org |
This link goes to the vendor site. EngiFree hosts no installers and distributes no cracked versions.
Last verified: 2026-10-05
