Project Summary
okular is an universal document viewer based on KPDF for KDE 4.
Its development began as part of Google's Summer of Code program. The description of the project is located at KDE Developer's Corner.
okular combines the excellent functionalities of KPDF with the versatility of supporting different kind of documents, like PDF, Postscript, DjVu, CHM, and others.
The document format handlers page has a chart describing in more detail the supported formats and the features supported in each of them.
In a Nutshell, Okular (KDE)...
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has a well established, mature codebase
maintained by a very large development team
with stable Y-O-Y commits -
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took an estimated 43 years of effort (COCOMO model)
starting with its first commit in August, 2002
ending with its most recent commit 21 days ago
Quick Reference
GNU General Public License v2.0 or later
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Forbidden
Sub-License
Hold Liable
Required
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
Did You Know...
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use of OSS increased in 65% of companies in 2016
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55% of companies leverage OSS for production infrastructure
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30 Day SummarySep 17 2026 — Oct 17 2026
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12 Month SummaryOct 17 2025 — Oct 17 2026
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