Can I compare two Word documents online?

Yes. Drop two DOCX files into the left and right panels, and Zolkit extracts text locally before showing the differences side by side.

Does this support old .doc files?

Legacy .doc files are not supported directly because they use a different binary format. Save or export the file as .docx first, then compare the two modern Word documents.

Is this the same as Microsoft Word track changes?

No. Track changes records edits while a document is being edited. Zolkit compares two finished versions and highlights differences even when track changes are not available.

Can I use this for contracts?

Yes. Contract reviewers can compare clauses, definitions, pricing language, and obligations by dropping DOCX files or pasting extracted text into both sides.

Compare Word Documents

Compare two Word documents online. Drop DOCX files or paste text to find additions, deletions, and changed clauses.

For scanned PDFs or image-only files, copy the OCR text into the comparison panels before comparing.

Ignore whitespace

Original

Changed

Comparison results

Added: 0Removed: 0Changed: 0Unchanged: 0

Add content on both sides to compare.

Word document comparison is useful when teams exchange drafts, contracts, translations, policies, and research papers. Drop one DOCX file into each side of the tool and Zolkit extracts the document text from the Office Open XML package in your browser. The diff view highlights removed text in red, added text in green, and aligned changed lines so reviewers can focus on the actual edits. This is especially helpful when track changes are missing, disabled, or lost after copying content between tools. The browser-only workflow keeps sensitive wording local while still giving editors, lawyers, students, and researchers a fast review surface.

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Online Diff Checker for Text, JSON, and Documents

Zolkit's Diff Checker compares two texts, code snippets, JSON payloads, Word files, Excel sheets, PowerPoint decks, and PDF documents in your browser. Use it to spot added, deleted, and changed lines without uploading sensitive contracts, drafts, API responses, or internal documents.

Browser-Only Privacy

Text comparison and supported document extraction run locally in your browser, so confidential drafts and legal files do not need to be uploaded.

Document Input

Drop DOCX, XLSX, PPTX, TXT, CSV, JSON, and PDF files, or paste text directly into the side-by-side panels.

JSON Diff Mode

Normalize JSON before comparing so formatting noise is removed and structural changes are easier to review.

Side-by-Side Results

Added lines are highlighted in green, removed lines in red, and changed rows are aligned for fast review.

Whitespace Control

Ignore whitespace when indentation or line wrapping should not count as a meaningful change.

Free to Use

Compare text and files without an account, installation, or per-document limit from Zolkit.

How to Compare Text or Documents

1
Paste text into both panels, or drop one supported file into each side.
2
Choose Text or JSON mode, then enable Normalize JSON or Ignore whitespace when useful.
3
Review the side-by-side diff where additions are green, removals are red, and changed rows are aligned.