OPF Manifest Validator with One-Click Fix Suggestions
Diagnose EPUB package issues instantly, apply intelligent auto-fixes, and export shareable validation reports. Built for editors, publishers, and QA teams that demand accurate manifests without friction.
Manifest Input
Your file never leaves this browser tab.Results & Smart Fixes
Blocking Issues
Warnings
One-Click Fix Suggestions
Validation Summary
About This OPF Validator
Our OPF Manifest Validator with One-Click Fix Suggestions is engineered for editors, conversion specialists, and digital publishers who need to release EPUB titles without delays. We analyzed leading competitors across forums, agency blogs, and open repos, and saw the same bottlenecks: bloated interfaces, opaque error messages, limited EPUB 3 support, and zero guided repair flows. This tool changes that with a streamlined interface, quick-launch demo data, bulk auto-fix, and navigation or NCX checks that the legacy dashboards skip. Everything runs locally in your browser, so your intellectual property stays offline and secure while benefiting from a modern, mobile-first UX that loads in under two seconds.
How to Use
Drag in your .opf file or paste the XML manifest into the editor, then tap Validate Manifest. Blocking errors, best-practice warnings, media-type mismatches, duplicate hrefs, and EPUB-version nuances appear instantly. Use the Auto-Fix Everything control to apply every safe repair at once, preview individual fixes in a sandbox tab, or load the bundled demo manifest to practice without risking production files. When you are satisfied, export a timestamped JSON QA report for audit trails or generate a shareable link that recreates the state for teammates. The tool also remembers your latest session locally so you can resume work without starting over.
Tips for Cleaner EPUB Manifests
Adopt consistent naming conventions for manifest id values, and keep media types aligned with the latest EPUB 3 specifications. Use the validator's beautify option to standardize indentation before committing updates to version control - readable manifests reduce merge conflicts. Lean on the smart checks that flag missing nav items, NCX targets, and duplicate resource hrefs before a distributor rejects your upload. If you frequently localize titles, leverage the one-click fix that inserts language tags with the correct namespace and ensures the unique-identifier attribute points to a matching metadata entry. Finally, export the JSON report and store it alongside your automated test results to build a transparent compliance log.
FAQs
Does the validator run entirely offline?
Yes. Every validation, fix, and export runs in your browser without uploading files. You can even install the page as a progressive web app for offline quality checks during travel.
Which OPF versions are supported?
The tool detects EPUB 2 and EPUB 3 package documents, verifies namespace usage, and flags deprecated attributes. Smart rules adapt the suggestions to the version identified in the package element.
Can I share validation results with collaborators?
Use the shareable permalink button to encode your manifest and diagnostic summary into a secure link. Anyone with the link sees the same validation state and can export the QA report or continue applying fixes.
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