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Validate Canonical Fragment Identifiers (CFI) in PDF documents to ensure proper document navigation and accessibility.

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About This Tool

The CFI Checker is a comprehensive tool for validating Canonical Fragment Identifiers in PDF documents. CFIs are standardized references to specific locations within structured documents, commonly used in EPUB and PDF formats for navigation and accessibility. This tool allows users to either upload PDF files to extract and validate existing CFIs or manually enter CFI strings to check their syntax and structure. It performs thorough validation including syntax checking, path verification, and accessibility compliance. The tool provides detailed feedback on CFI validity with specific error messages for any issues found.

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How to Use

Upload a PDF file using the file upload area or drag-and-drop
Alternatively, manually enter a CFI string in the text input field
Click the 'Validate CFI' button to start the validation process
View the results showing whether the CFI is valid or invalid
For invalid CFIs, see detailed error messages explaining the specific issues
Download the validation report if needed

Frequently Asked Questions

Find Quick Answers

What is a Canonical Fragment Identifier (CFI)?

A Canonical Fragment Identifier is a standardized way to reference specific locations within structured documents like PDFs and EPUBs. It provides a precise navigation path to content elements within the document structure.

Why should I validate CFIs in my PDF documents?

Validating CFIs ensures proper document navigation, accessibility compliance, and interoperability with reading systems. Invalid CFIs can break navigation links and hinder accessibility features.

What types of validation does this tool perform?

The tool checks CFI syntax, validates path structure, verifies element existence within the document, and ensures compliance with CFI specification standards.

Can I use this tool without uploading a PDF file?

Yes, you can manually enter CFI strings in the text input field to validate their syntax without uploading a document. However, full validation including element existence requires a PDF upload.

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