Logrun Lab

Compare Text Changes Between Two PDFs

Choose two PDFs with usable text layers. PDF Compare extracts and normalizes their text in your browser, then shows mechanical Added, Removed and Changed results with page references.

Limit: up to 20 MB and 200 pages per PDF

Original PDF

Choose the baseline position for this comparison

A

New PDF

Choose the PDF you want to compare with the baseline

B

PDF Compare requires an existing usable text layer and does not run OCR. A mixed PDF can be accepted if some pages contain extractable text; image-only pages are not compared.

PDF files, extracted text and comparison results stay in the current browser session and are not stored by Logrun Lab as document content.

If TXT/MD support is relevant to you, click the button on the right. These formats may be added in future versions

Original and New are positions you choose for this comparison. Added and Removed are defined relative to those positions. PDF Compare does not determine which file is historically newer or who made an edit.

How to read the result

  • Changed: a paired text block exists on both sides, but the wording differs. Within the pair, the result can show finer added and removed text.
  • Added: text appears on the New side without a paired text block on the Original side.
  • Removed: text appears on the Original side without a paired text block on the New side.
  • Page references: use them to return to the source PDFs and read the surrounding context. They do not guarantee visual alignment or complete layout comparison.

These labels describe a mechanical text comparison. They do not indicate the importance, risk or authorship of an edit.

What “No meaningful text changes found” means

No meaningful text changes found means only that the current text comparison did not detect meaningful changes in the extracted and normalized text it could process. It does not prove that the complete PDF files are identical.

The text comparison does not cover image-only or scanned content without a usable text layer, images and graphics, visual-formatting or layout-only changes, metadata, or other non-text PDF structure.

Text layers and the OCR boundary

PDF Compare requires an existing usable text layer and does not run OCR. A mixed PDF can be accepted if some pages contain extractable text. That does not mean image-only pages were compared.

The comparison normalizes supported text-extraction noise such as whitespace and some line-wrap or page-break effects, so differences caused only by those extraction effects are less likely to appear as text changes.

Limits and processing

You can compare two PDFs of up to 20 MB and 200 pages each. Password-protected or encrypted PDFs are not supported in the current version.

PDF files, extracted text and comparison results stay in the current browser session and are not stored by Logrun Lab as document content.

Comparing contract revisions? After using the generic PDF comparison, see the contract-version comparison workflow.