Compare two document versions clearly

Key takeaways

• Name both versions clearly with date and role.
• Word’s technical comparison shows every change; Docsi explains the important ones.
• Sort changes by type: added, removed, reworded, moved, number changed.
• Pay special attention to deadlines, amounts and modal words such as “must” and “may”.
• In case of doubt, the original text prevails, not the summary.

Distinguish old and new versions

Name files for example “old – 2026-09-01” and “new – 2026-10-01”. Specify whether you want to compare figures, actions, dates or wording. Identical file names make review harder even when their contents differ.

An AI comparison is not a guaranteed character-by-character comparison. For a binding change review, also use the source application’s comparison function and read critical sections yourself.

Review the comparison in two passes

1. Add both files and identify their roles in the request.
2. Request a table with topic, old statement, new statement and source reference.
3. Check changes involving figures, owners and qualifications first.
4. List unclear passages as unresolved comparison points rather than resolved differences.

Review wording and meaning separately

Shorter wording may have the same meaning; a single “not” can reverse it. Request a brief explanation of each material change. Reordered sections and moved paragraphs are not automatically new content.

What the comparison additionally needs

First establish which version is authoritative for your next task. Comparing reveals differences but does not automatically decide which version applies. If a newer draft removes a definition, also check whether later sections still depend on it. One changed sentence can affect several other passages. Ask for a list of potential dependencies and check them yourself instead of accepting a blanket statement that everything else is unchanged.

For long files, a first comparison of headings can reveal missing or renamed sections. Then compare individual critical topics with their complete surrounding paragraphs. Keep both originals and the comparison separately. After another revision, the comparison represents an older state; check new material claims against the actually current files.

Combining Docsi’s comparison with a technical diff

Word offers a technical comparison of two documents under “Review → Compare”: every inserted, deleted or moved passage appears as a change. That is complete but hard to survey for long texts. Docsi, by contrast, answers questions such as “What changed in the contractor’s obligations?” and explains the meaning.

A good workflow uses both: first the technical comparison shows where something changed, then Docsi explains the important passages with evidence from both versions. That way you miss no change and still understand which ones matter.

Sorting changes by type

Ask Docsi to sort changes into a table with five columns: section, type of change, old wording, new wording and source. Suitable types are “added”, “removed”, “reworded”, “moved” and “number or date changed”. This classification shows whether a version was merely polished or changed in substance.

Changed numbers, deadlines, quantities and modal words such as “must”, “should” or “may” deserve special attention. A single word can turn an obligation into a recommendation. Always read these passages in both originals.

Comparing PDF versions

For PDFs, Docsi compares the text of the pages. Both versions therefore need a text layer; if one of them is scanned, have the relevant pages recognised locally first and check the text. A text comparison does not detect differences in layout, fonts or figures.

If page numbers shift between versions, the source markers give each version its own page. So do not compare “page 4 with page 4”, but follow the markers into each file.

Naming versions clearly

Most mix-ups come from names like “Contract_final_new2.docx”. Better is a date in year-month-day format and a short role: “Contract_2026-10-12_draft.docx” and “Contract_2026-10-26_counterdraft.docx”. These names sort chronologically and explain themselves.

If several people work on a document, recording changes in Word is often a better way than separate versions. Docsi then helps at the end to summarise the accepted changes or to prepare an overview for approval.

Writing a change report for others

For colleagues, clients or a study group, the complete list is rarely enough. Ask Docsi for a short report: a three-sentence summary, a table of material changes with sources in both versions and a list of open questions. As a Word file, others can comment directly.

State in the report that it is an explanation and not a legal or expert review. For contracts or examination regulations, the original text prevails in case of doubt, not the summary.

A worked scenario

An example: you have a draft rental agreement from 12 October and a revised version from 26 October. First you use “Compare” in Word and see 37 marked changes. Then you add both versions to Docsi, label them “old” and “new” and ask: “Which changes concern costs, deadlines or the tenant’s obligations?”

Docsi names five passages with evidence from both versions, including a changed notice period and a new service charge item. The remaining changes are linguistic. You read the five passages in both originals and clarify the new cost item before signing – leaving the legal assessment to an adviser if needed.

Checklist before sharing

Before you pass a change report on, go through these points once. They take a few minutes and prevent the most common misunderstandings.

1. Both versions are named with date and role.
2. Every material change has a source in the old and the new version.
3. Changed figures, deadlines and modal words have been read in both originals.
4. The report states explicitly that it does not replace a legal review.

Key terms explained

Version

A particular state of a document, ideally named with date and role.

Technical diff

A list of all text differences between two files, for example with “Compare” in Word.

Recorded changes

A Word feature that records changes visibly until they are accepted or rejected.

Modal word

Words such as “must”, “should” or “may” that set the degree of an obligation.

Dependency

A passage that relies on another, such as a definition later sections refer to.