w3c/epubcheck
View on GitHubThe conformance checker for EPUB publications
- Stars
- 2k
- Forks
- 444
- Open beginner issues
- 0
- Indexed issues
- 78
- Avg merge
- 3d 18h
- Merged PRs (30d)
- 35
- Dominant language
- Java
- License
- BSD-3-Clause
- Last GitHub push
- Sep 15, 2026
- Latest indexed
- Sep 20, 2026
- Contributing guide
- Contributing guide
- Code of conduct
- Code of conduct
- Beginner labels
- No beginner labels indexed
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A dc:date ending in '.' throws NoSuchElementException and aborts validation with an empty report Openstatus: has PR type: bug
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status: waiting for feedback type: unverified
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status: accepted type: improvement
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priority: critical status: has PR type: false-positive
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status: in discussion type: question
Difficulty 5/5 Over a week Newbie friendliness 28/100
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status: needs review type: improvement
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status: in discussion type: feature
Difficulty 5/5 Over a week Newbie friendliness 35/100
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status: in discussion type: improvement
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status: needs test case type: unverified
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priority: low status: in discussion type: feature
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status: in discussion type: spec
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priority: low status: needs review type: improvement
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Image Dimensions Openstatus: accepted type: improvement
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priority: low status: ready for implem type: improvement
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spec: EPUB 3.x status: in discussion type: spec
Difficulty 4/5 3-5 days Newbie friendliness 30/100
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newcomers friendly 😊 priority: low status: ready for implem type: tests
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priority: low status: needs contribution type: feature
Difficulty 5/5 Over a week Newbie friendliness 20/100
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priority: low status: in discussion type: improvement
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priority: low spec: EPUB 3.3 status: accepted
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status: accepted type: docs
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status: in progress type: maintenance
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priority: low status: accepted type: improvement
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priority: low status: in discussion type: improvement
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priority: low status: needs contribution type: maintenance
Difficulty 4/5 3-5 days Newbie friendliness 38/100
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priority: low spec: all status: ready for implem type: improvement
Difficulty 5/5 Over a week Newbie friendliness 35/100
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priority: low spec: EPUB Multiple Renditions status: accepted type: improvement
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spec: EDUPUB status: in discussion type: tests
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spec: EDUPUB status: in discussion type: tests
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spec: EPUB Indexes status: in discussion type: tests
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priority: low spec: EPUB 3.x status: in discussion type: spec
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priority: low spec: EPUB 3.x status: in discussion type: spec
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Message codes revamp Openstatus: in discussion type: improvement
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priority: low status: needs contribution type: feature
Difficulty 3/5 1-2 days Newbie friendliness 45/100
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VTT validation Openpriority: low status: needs contribution type: feature
Difficulty 4/5 3-5 days Newbie friendliness 30/100
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status: needs test case type: unverified
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priority: low spec: EPUB 2.x status: accepted type: improvement
Difficulty 3/5 1-2 days Newbie friendliness 35/100
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priority: low status: accepted type: improvement
Difficulty 5/5 Over a week Newbie friendliness 25/100
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spec: all status: accepted type: feature
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priority: low status: accepted type: maintenance
Difficulty 5/5 Over a week Newbie friendliness 20/100
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priority: low spec: all status: accepted type: improvement
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status: accepted type: improvement
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priority: low status: needs contribution type: maintenance
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priority: low status: stalled type: maintenance
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priority: low type: improvement
Difficulty 3/5 1-2 days Newbie friendliness 35/100
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type: improvement
Difficulty 4/5 3-5 days Newbie friendliness 25/100
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status: needs contribution type: improvement
Difficulty 5/5 Over a week Newbie friendliness 20/100
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type: improvement
Difficulty 4/5 3-5 days Newbie friendliness 35/100
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priority: low type: improvement
Difficulty 5/5 Over a week Newbie friendliness 25/100
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spec: all status: blocked type: bug
Difficulty 4/5 3-5 days Newbie friendliness 25/100
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status: needs contribution type: improvement
Difficulty 4/5 3-5 days Newbie friendliness 25/100