Compare Two PDF Files Free. See Every Difference Highlighted Instantly.

When you upload two PDFs to RepetiGo's comparison tool, every difference between them is mapped and colour-coded. Here is what the tool detects:

Three steps. The comparison result is ready in seconds for most documents.

Click the first Upload button and select the original or older version of your document - the baseline you are comparing against. This might be the first draft of a contract, last month's report, or the version you sent for review. Upload travels over TLS encryption.

Click the second Upload button and select the revised or newer version - the document that was returned, updated, or is suspected of changes. The tool aligns the two documents and identifies every difference between them.

The comparison result displays both documents side by side with all differences highlighted. Navigate through each change using the difference navigator - skip to the next addition, deletion, or modification. Download the comparison report to share with your team, legal counsel, or client.

PDF comparison is a specialist workflow. The people who need it, need it precisely.

• Legal professionals: Contract redlining is the most common use case. A lawyer sends a draft contract, the counterparty returns a 'revised' version. Instead of reading both documents to find changes, the comparison tool highlights every addition and deletion - exactly what changed between what was sent and what came back. Irreplaceable for high-stakes agreements.
• Auditors and CA firms: Comparing a draft financial statement against the final signed version, or a prior-year report against the current year's figures. The tool identifies every number, note, and disclosure that was changed between versions - critical for ensuring only agreed changes were incorporated.
• Procurement and compliance teams: Tender documents, policy versions, and regulatory submissions often go through multiple revision cycles. Comparing the issued version against the returned or updated version confirms that only authorised changes were made.
• Academic and publishing workflows: Research papers, thesis drafts, and book manuscripts submitted for review come back with edits. Comparing the original against the reviewed version shows exactly what the reviewer or editor changed.
• Software and product documentation: Technical specification PDFs, user manuals, and API documentation updated between product releases. Version comparison identifies every changed parameter, new feature description, or removed function.
• HR and operations teams: Employment contracts, policy documents, and process manuals - comparing versions after update cycles to confirm that only intended changes were applied and nothing was accidentally removed.

A common workflow in legal and business settings: you draft a document in Word, convert it to PDF and send it out, and the counterparty returns it as a PDF. To compare what changed between your Word source and the returned PDF, you have two options:

• Option 1 - Convert the Word document to PDF first: Export your Word document as a PDF (File → Save As → PDF in Microsoft Word), then upload both PDFs to RepetiGo's comparison tool. This is the cleanest approach - both files are in the same format and the comparison is accurate at the text level.
• Option 2 - Use a Word-to-PDF comparison tool: Some enterprise tools (Microsoft Word Track Changes, Adobe Acrobat Pro) can directly compare a Word document against a PDF. These work well if you have access to them, but they are paid tools with subscription requirements.

RepetiGo works entirely with PDF files - to compare a PDF and a Word document, convert the Word file to PDF first, then upload both PDFs for comparison.

Adobe Acrobat Pro has a built-in document comparison feature - but it requires a paid subscription. Adobe Reader (the free version) cannot compare PDF files. For occasional or one-off PDF comparison without a subscription, RepetiGo provides the same comparison output - text additions, deletions, and modifications highlighted - free, in any browser.

• RepetiGo: Free · browser-based · text additions / deletions / modifications highlighted · comparison report downloadable · auto-deletes in 60 min · no account
• Adobe Acrobat Pro: Paid subscription · desktop app · full-featured document comparison · best for enterprise high-volume review workflows
• Adobe Reader: Free · cannot compare PDFs · read-only
• Microsoft Word (Track Changes): Compares Word documents natively · requires converting PDF to Word first · sometimes loses formatting in conversion

PDF document comparison is high-value in India's legal, financial, and procurement sectors - and there are currently zero well-established free tools targeting this need with India-specific context:

• Legal firms and in-house counsel: Contract negotiation in India involves multiple rounds of redlining. When a counterparty returns a 'revised' agreement, comparing the sent and received versions identifies every change - critical for ensuring no clause was altered without discussion.
• Chartered accountants and audit teams: Comparing draft financial statements with final signed versions, or year-on-year reports, to verify that only agreed adjustments were incorporated. The comparison serves as a quality-check audit trail.
• Government and PSU procurement: Tender document comparison - confirming that the issued tender document matches the version that bidders received, or that amendments were correctly incorporated into the final contract.
• Court submissions and e-filing: Legal teams submitting documents to courts can compare draft pleadings against filed versions to verify the correct version was submitted and no last-minute changes are unaccounted for.
• Banking and NBFC documentation: Loan agreements, security documents, and facility letters compared between the term sheet stage and the executed document to confirm all agreed terms are correctly reflected.

With RepetiGo you can compare PDF files free online in India - upload both versions, get every difference highlighted, and download the comparison report in seconds. Files are permanently deleted within 60 minutes.

The documents you are comparing are almost always sensitive - contracts under negotiation, confidential financial statements, proprietary specifications. Here is exactly what happens to them:

• 🔒 Encrypted upload: Both PDF files upload over TLS encryption. They cannot be intercepted in transit.
• 🔐 Isolated processing: Your files process in a temporary session with no link to any account or persistent identifier.
• 🗑️ Auto-deleted in 60 minutes: Both uploaded PDFs and your comparison report are permanently deleted within 60 minutes.
• 👁️ Content never read: The comparison engine maps text differences between the two files. It does not read, extract, store, or analyse the substantive content of your documents.
• 🚫 No account = no data: No sign-up means we hold zero information about you, your documents, or your comparison sessions.

Document service centres and high-street legal print shops increasingly handle document comparison requests - a customer brings two contracts and needs a marked-up comparison printed. Doing this manually (printing both, reading them side by side, marking differences by hand) is slow and error-prone. PrintPilot - RepetiGo's document shop automation platform - can run automated PDF comparison as part of the service workflow: upload both documents, generate the comparison report, send it to the print queue.

Text additions (shown in green), text deletions (shown in red), text modifications (both old and new versions shown), content that has moved between sections, and page-level changes (pages added or removed). The comparison works on the text layer of both PDFs - structural text differences are what gets flagged.

Export your Word document to PDF first: in Microsoft Word, go to File → Save As and choose PDF format. Then upload both PDF files to RepetiGo's comparison tool. The comparison will show every text difference between the Word-derived PDF and the other PDF. This takes under a minute and requires no paid software.

Yes - contract redline comparison is one of the primary use cases. Upload the version you sent as the first PDF and the returned 'revised' version as the second. Every clause addition, deletion, and modification is highlighted in the comparison result. Download the marked-up comparison report to share with your legal team or client.

Scanned PDFs are images of pages - they do not have a searchable text layer, so the comparison tool cannot detect text-level differences. To compare scanned PDFs, first run RepetiGo's OCR PDF tool at /pdf-tools/ocr-pdf on each scanned file to add a text layer, then upload the OCR-processed PDFs for comparison.

Permission-restricted PDFs cannot be processed for text comparison. First remove the editing restrictions using RepetiGo's Unlock PDF tool at /pdf-tools/unlock-pdf (no password needed for permissions-locked PDFs), then upload the unrestricted files for comparison.

The comparison is accurate to the character level - every single text change, including punctuation and spacing, is detected. For PDFs where both files use the same or similar fonts and layout, accuracy is very high. Complex PDFs with custom formatting, right-to-left text, or unusual character encodings may occasionally require manual verification of specific sections.

The current tool compares two PDFs per session - a baseline and a revised version. To compare multiple versions (draft 1 vs draft 2, draft 2 vs draft 3), run separate comparisons for each pair. After comparing, use RepetiGo's Edit PDF tool at /pdf-tools/edit-pdf to make corrections to the older version based on your comparison findings.

Adobe Reader (the free version) cannot compare PDF files. Adobe Acrobat Pro (the paid subscription) has a built-in document comparison feature. RepetiGo provides equivalent PDF comparison functionality - text additions, deletions, and modifications highlighted - free, in the browser, without any Adobe subscription.

With RepetiGo, yes. Both uploaded PDFs travel over TLS encryption, process in an isolated temporary session, and are permanently deleted within 60 minutes - whether you download the comparison report or not. The comparison engine detects differences between text layers; it does not read, store, or extract the content of your documents. No sign-up means we hold no information about you or your files.

• Edit PDF → /pdf-tools/edit-pdf - after comparing, correct the older version
• OCR PDF → /pdf-tools/ocr-pdf - add a text layer to scanned PDFs before comparing
• Unlock PDF → /pdf-tools/unlock-pdf - remove restrictions from locked PDFs before comparing
• Protect PDF → /pdf-tools/protect-pdf - lock the final agreed version after comparison
• Sign PDF → /pdf-tools/sign-pdf - sign the verified document after confirming it is unchanged
• Merge PDF → /pdf-tools/merge-pdf - combine PDFs after comparison and approval
• All PDF Tools → /pdf-tools - complete free PDF tools library

See every addition, deletion, and change · No sign-up · Auto-deleted in 60 minutes