Asterinked

Pen-based PDF annotation tool for Android

Current limits Password-protected PDFs are rejected. Digital signatures are not preserved as valid signatures after modification. Exported ink is permanent page content; reopen it to add more notes, not to erase previous strokes. Undo/redo applies to strokes in the current draft. Preview resolution is capped; high zoom can soften the underlying page. Ink remains vector in the output. The active, unfinished stroke and redo history are not restored after process death. Completed strokes are queued for disk immediately.