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Document Version Comparator & Redline

Compare two PDF or Word documents and see what changed.

Add the original and the revised version. You get a visual redline and a change register with changed numbers, dates and money listed first.

Add both versions

  1. OriginalPDF, DOCX or TXTChoose file
  2. RevisedPDF, DOCX or TXTChoose file
Compare documents

Both files are chosen in the comparison workspace. Formats may be mixed, for example DOCX against PDF.

Free: 3 comparisons a day, up to 10 MB each, no account · Pro: up to 50 MB each, €12.99/month · Plans

No file at hand? Try the prepared example

Formats, limits & file handling
Works with
PDF, DOCX, TXT
Free limit
3 jobs a day · 10 MB per file · 50 pages per job
Maximum with Pro or credits
2 files · 50 MB and 250 pages each · 400 pages total
You receive
Side-by-side PDF, redline, XLSX register and manifest ZIP
File handling
Encrypted sources and results · 24 hours

Upload the original and revised file. Review changed clauses, numbers, dates, tables, moved text and uncertain matches without reading every page twice.

THREE STEPS

From two versions to one change register.

  1. 01
    Add both versions

    Choose the original and the revised PDF, DOCX or TXT file and confirm which is which.

  2. 02
    Review the changes

    Numbers, dates and money come first. Uncertain matches are kept in a separate Needs review list.

  3. 03
    Download

    Redline, side-by-side PDF, XLSX register and manifest. Failed jobs are never counted.

Interactive synthetic comparison

See the changed terms before opening a real file.

Switch the review focus in a prepared fictional service agreement. Nothing is uploaded.

✓
No public uploadSynthetic agreement only
Comparison coverage96%Complete
Changes52 critical values
Needs review1OCR footer
Showing all 5 prepared changes.

Automated comparison — not legal advice.Review important changes against the source documents.

Two files, one focused review

A change register built around the source documents

  1. Add both versions.Choose exactly one original and one revised PDF, DOCX or TXT file, then confirm the exact roles.
  2. Extract structure locally.Headings, paragraphs, lists, tables, headers and footers are compared where the format exposes them. Scans use local OCR.
  3. Align without guessing.Exact blocks match first. Strongly similar sections can align; weak suggestions move to Needs review.
  4. Prioritise critical values.Money, percentages, dates, durations and changed numbers appear before ordinary wording edits.
  5. Download the evidence.Receive an accessible HTML report, visual redline, side-by-side PDF, readable XLSX register, self-verifying manifest and unchanged sources. DOCX pairs also receive a portable tracked-revision Word report.

Changes kept distinct

Inserted or deletedContent present in only one version.
ChangedAligned wording with inline old/new differences.
MovedMatching content found in a different structural position.
Needs reviewOCR or alignment confidence is too low for certainty.

Clear professional boundary

The tool identifies technical differences. It does not interpret clauses, score legal risk, recommend acceptance or guarantee detection of every semantic or visual change. Its generated Word redline is a portable review report, not a layout-preserving copy of either source.

Which files can I compare?

Exactly one original and one revised file. PDF, DOCX and TXT are supported and may be mixed. On the free tier each file can be up to 10 MB, with 50 pages per job. With Pro or credits each file can be up to 50 MB and 250 pages, with 400 pages across the pair.

Does this replace legal review?

No. It reduces page-by-page comparison work but never judges meaning, risk or acceptance.

How are scanned pages handled?

Local OCR extracts readable text and records that OCR was used. Uncertain text lowers coverage and stays visible for human review.

Are the source documents changed?

No. Both originals remain byte-for-byte unchanged and their SHA-256 hashes are recorded in the manifest.

What is in the download?

A standalone HTML report, a side-by-side PDF, a redline PDF, an XLSX change register, the manifest and unchanged copies of both sources. DOCX-to-DOCX jobs can also include a tracked-changes DOCX.

Available now

Review the revision, not every repeated paragraph.

Use the synthetic comparison now. Real encrypted uploads run on the free tier, 3 jobs a day without an account.

Compare prepared revisionsReview safeguards