Compare Two PDFs by Text: Diffs for Revisions and Contracts
When a visual compare is not enough, a text-layer diff highlights insertions and deletions—plus what this approach cannot see.
Text comparison works on extractable content—the same characters you could copy from a well-made PDF. It is fast and precise for wording changes between drafts, policies, and statements of work.
It does not compare images, vector art, or scanned pages that lack a text layer. For scans, run OCR first so each page has selectable text, then compare or export to text for a manual review.
Workflow tips
Align versions clearly: upload the older baseline as the first file and the newer revision as the second so additions and removals read naturally in the unified diff.
If the diff is empty but the documents look different, check whether changes are purely visual (fonts, colors, images). Use PDF to Text on each file to confirm what extraction sees.