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TOOLS / VALIDATOR PLAYGROUND

See how a publishing check reaches a finding.

Edit safe sample signals and watch selected rules respond. Nothing entered here is uploaded or saved.

Demonstration results

PASSMimetype entry listed
PASSContainer document listed
PASSPackage document listed
PASSNavigation document listed

This playground checks only the text you enter. It does not inspect a real file, replace EPUBCheck or professional PDF preflight, or certify distributor acceptance.