EPUB Checker

Validate EPUB files for structure, metadata, and standards compliance

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About This Tool

The EPUB Checker is a comprehensive online tool that validates EPUB files against industry standards. Upload your EPUB file to check for structural integrity, metadata completeness, link validity, and compliance with EPUB specifications. The tool performs both client-side basic checks and server-side deep validation, providing detailed reports with actionable feedback.

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How to Use

Click the upload area or browse to select an EPUB file
Choose validation options (basic or comprehensive)
Click 'Validate EPUB' button
View detailed validation results with error/warning categories
Download the validation report if needed

Frequently Asked Questions

Find Quick Answers

What EPUB versions does this tool support?

The tool supports EPUB 2.0, EPUB 3.0, and EPUB 3.2 specifications, checking for version-specific requirements.

What types of issues can the EPUB Checker detect?

It detects structural issues (missing container.xml, invalid OPF), metadata problems, broken internal links, CSS validation errors, image format issues, and compliance violations.

Is my EPUB file stored on your servers?

No, files are processed temporarily during validation and are not permanently stored. All processing occurs in memory and files are deleted after validation completes.

Can I validate large EPUB files?

Yes, the tool can handle EPUB files up to 100MB. For larger files, consider splitting them or using specialized desktop validators.

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