Two PDF versions and need to see what changed? PDF compare on Itqan Tools shows both files side by side, lists semantic text differences, and offers a visual page overlay — with scroll sync, searchable changes, and a downloadable report. This guide covers modes, workflows, and tips for platform users.
What is PDF compare?
A PDF compare tool answers: what is different between version A and B? Load both files into one workspace instead of flipping between windows. Itqan highlights changes as a text edit list (additions, deletions, replacements) or as stacked page layers you can fade in and out.
Unlike merge PDF or edit PDF, compare is read-only analysis — it does not modify originals unless you download a marked-up report. Semantic mode reads extractable text; visual overlay renders pages as image stacks to catch moved logos, shifted margins, or replaced diagrams.
When do you need to compare PDFs?
Any time two versions of the same document exist, manual eyeballing becomes slow and error-prone. Common situations include:
- Contracts and legal drafts: A client returns a revised agreement — you need to confirm every clause change before signing.
- Financial reports: Verify that updated figures in Q2 match the approved Q1 baseline.
- Translation QA: Compare a translated PDF against the source language file to catch missing paragraphs.
- Regulatory filings: Confirm only approved edits appear between draft and final versions.
- Design and engineering: Spot layout shifts in plans, mockups, or brochure proofs.
- Archive integrity: Verify a backup matches the master on another drive.
- Internal approval: Review a colleague's policy edits before publishing.
Compare saves hours compared to line-by-line reading on documents longer than ten pages.
Compare vs merge vs edit vs OCR?
Itqan offers many PDF tools. Pick the one that matches your goal:
- PDF compare (this guide): Find differences between two versions — text list or visual overlay.
- Merge PDF: Combine multiple files into one — no diff detection.
- Edit PDF: Add text, images, shapes, or annotations on a single file.
- OCR PDF: Turn scanned images into searchable text — useful before semantic compare on scans.
- Redact PDF: Permanently remove sensitive content — not the same as reviewing diffs.
Typical chain: run OCR on a scan if needed, then compare, then sign or protect the approved final.
Semantic vs visual overlay — which mode to use?
Semantic (text) mode
Best for selectable text — contracts, policies, reports, and exported Word files. The sidebar lists each change as an addition, deletion, or edit with old and new snippets and page numbers. Use the search box to jump to a clause or amount; click an entry to scroll both panes to that page.
Visual overlay (layer view) mode
Best when layout matters — brochures, forms, technical drawings, or PDFs with unreliable text extraction. Set page numbers for A and B independently (useful when one version has an extra cover). Adjust overlay opacity from 10% to 90% and enable scroll sync to scan for shifted elements or resized images.
| Mode | Best for | Limitation |
|---|---|---|
| Semantic (text) | Contracts, reports, policies | Less reliable on pure image scans |
| Visual overlay | Layouts, diagrams, design proofs | Does not list every word change automatically |
Many workflows use both: start with semantic mode for a quick change inventory, then switch to overlay on pages where the text list looks incomplete.
Dual viewer features
After upload, pane A and pane B each have independent zoom and a hand tool for panning magnified pages. Hide the sidebar on small screens. File names in each footer identify the version; swap either file without reloading.
Real-world scenarios — four common cases
Revised vendor contract
Legal returns a 24-page agreement with “minor edits.” Upload original as A and returned copy as B. Run semantic mode, search payment and liability terms, confirm only expected changes, then download the report before countersigning.
Translated product manual
Compare English source (A) with Arabic translation (B) semantically. Watch for unexpected deletions — often a dropped section. Use overlay on diagram pages to verify illustration alignment.
Marketing brochure proof
Design returns v3 of a flyer. If fonts were outlined, semantic mode may show few diffs. Switch to 50% overlay with scroll sync and inspect the hero image and price badge.
Scanned invoice archive
Two invoice PDFs look identical but totals differ. Run OCR PDF on both, then compare semantically to catch the number change.
How to compare PDFs on Itqan — step by step
- Open PDF compare in Chrome, Firefox, Safari, or Edge.
- Upload two PDF files — drag-and-drop, file picker, or import from Google Drive or Dropbox. Treat A as baseline and B as the newer version.
- Wait for both documents to render in the side-by-side viewer.
- Choose Text differences (semantic) or Layer view (overlay) from the sidebar tabs.
- In semantic mode: review the numbered change list, use search to filter, and click entries to jump to pages.
- In overlay mode: set page numbers for each file, adjust opacity, and enable scroll sync.
- Use per-pane zoom and the hand tool to inspect fine print on either side.
- Click Download report to save a PDF or text summary for audit or email.
No account required. The interface supports Arabic and English for bilingual teams.
Suggested workflow
- Prepare files: Remove password protection via Remove protection when possible.
- Run semantic compare first on text-heavy documents.
- Verify visually with overlay on flagged pages or design-heavy sections.
- Download the report and attach it to your approval email or ticket.
- Apply fixes in Edit PDF if minor corrections remain.
- Sign or protect the approved version via Sign PDF or Protect PDF.
After comparing
Archive the report with both files using a dated filename (e.g. contract-v2-vs-v1-compare.pdf). If approved, compress before email and protect sensitive finals. Unexpected diffs mean reverting to baseline or requesting a corrected revision.
Common mistakes
- Uploading files in the wrong order — always treat A as baseline and B as the candidate version.
- Expecting semantic mode to work on unscanned image-only PDFs without running OCR first.
- Comparing PDFs with very different page counts in overlay without adjusting page numbers per side.
- Ignoring small text edits because the layout looks identical — semantic mode catches wording changes overlay may miss.
- Skipping scroll sync on long documents and losing track of which page pair you are viewing.
- Assuming compare modifies the files — it analyzes only; edits happen in other tools.
Practical tips
- For contracts and policies: start with semantic mode and search for dollar amounts, dates, and party names.
- For brochures and forms: use overlay at 50% opacity as a starting point, then fine-tune.
- Similar page counts and orientations produce the clearest overlay alignment.
- On mobile, semantic mode works well; overlay is easier on a tablet or desktop widescreen.
- Export from the same app when possible — consistent fonts improve diff accuracy.
Pre-compare checklist
- Both files are PDF — convert via Word to PDF if needed.
- Password locks removed when you have access.
- File A is the known baseline; file B is the version under review.
- Scans processed with OCR when reliable text diffs matter.
- Enough screen space for dual-pane view.
Frequently asked questions
Is PDF compare free?
Yes. Core compare features run in your browser without registration or payment.
Semantic vs overlay — which should I pick?
Semantic lists text additions, deletions, and edits with page numbers. Overlay stacks pages visually so you spot layout and design changes. Use semantic for contracts; overlay for proofs and diagrams.
Can I search the change list?
Yes. The semantic sidebar includes a search field to filter differences by keyword — helpful on long legal documents.
What does scroll sync do?
When enabled, paging or scrolling in one pane moves the other in parallel — page 7 on the left aligns with page 7 on the right.
Can I download a report?
Yes. Click Download report to save a summary — typically a marked-up PDF or text file depending on the processing path.
Are my files secure?
Files are uploaded over HTTPS, processed only to perform the comparison, and deleted from the server after a short retention period — not shared with third parties for marketing.
Does it work on scanned PDFs?
Overlay mode works on any rendered page. Semantic mode needs extractable text — run OCR PDF first on image-only scans for best results.
Does it work on mobile?
Yes. The responsive layout works on modern phones and tablets. Larger screens make overlay comparison more comfortable.
Summary
PDF compare on Itqan Tools helps you audit two document versions quickly — semantic text diffs for wording changes, visual overlay for layout shifts, scroll sync for long files, and a downloadable report for approvals. Upload from device or cloud, review in the browser, and chain with edit, sign, or protect tools when the right version is confirmed. Free, no install, files removed after processing.
Your security and privacy
Files transfer over encrypted HTTPS, are processed only for comparison results, and are purged after your session — not used for AI training or marketing. Comparison reports contain the diff data you requested; treat them as confidential. See Privacy Policy and Security for details. Confirm workplace data rules allow browser-based compare before uploading contracts or financial PDFs.