Flattener
Flatten annotations, form fields and transparencies into PDF page content inside Acrobat.
Selective Flattening
Flattener lets you choose exactly which annotation types to flatten — keep some comments visible while permanently embedding others into the page content.
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Try it free in your browser first
These free online tools do the single-file version of what Flattener automates in bulk:
Built on the Adobe PDF Library — the same engine as Adobe Acrobat.