Insect Life Cycles for Kids — Science Activities, Coloring Pages & Fun Facts

✨ NEW • Compare PDF • Cinematic 3D • Free

COMPARE PDF by Little Bright Minds

Compare two PDF files instantly – find added, removed, changed text. Magnifying glass highlights differences like contract v3 vs v4, 100% private, no upload.

Diff Finder Red & Green

100% Private

Free Forever

Compare Two PDF Files

Drag to reorder • Find Differences

📄 PDF A (Original - Version 3)

+ Add PDF A

To change the order of your PDFs, drag and drop the files as you want.

📄 PDF B (Modified - Version 4)

+ Add PDF B

To change the order of your PDFs, drag and drop the files as you want.

Comparison Mode Line by Line (Recommended) Word by Word

Options

Ignore Case Ignore Whitespace

⬇ Download Diff Report

0%Similarity

0Added Lines

0Removed Lines

0Total Changes

🔴 Red = Deleted / Removed 🟢 Green = Added / Changed

What is Compare PDF Tool? – Little Bright Minds Free Diff Checker

Little Bright Minds Compare PDF Tool is a free, cinematic, browser-based PDF comparison tool that finds differences between two PDFs. It preserves your original Merge PDF workflow: “To change the order of your PDFs, drag and drop the files as you want.” – now for comparison. Upload contract_v3.pdf (Version 3) and contract_v4.pdf (Version 4) – it highlights changes like “30 days prior → 60 days prior” and “Net 30 → Net 45” with magnifying glass, just like our 3D hero image.

Whether you are a lawyer checking contract revisions, a student comparing two versions of a report, or a teacher verifying assignment changes, this tool shows exactly what changed – red for deleted, green for added.

✨ Built from your original Merge PDF code: We preserved your exact drag-and-drop, preview-container, merge-btn logic, but rewrote the engine to extract text via PDF.js and diff via diff library. No server, 100% private, AdSense compliant.

Why Compare PDF?

• Spot Changes Fast: No more manual side-by-side reading – highlights added/removed in colors.
• Legal & Contracts: Verify termination notice changed from 30 to 60 days, payment terms Net 30 to Net 45, liability $100k to $150k.
• Academic: Compare two drafts of thesis to see what professor changed.
• Privacy First: Your contracts never leave your device – comparison happens in browser memory.

🔍 Magnifying Glass Diff Gold magnifier over SERVICE AGREEMENT VERSION 3 vs VERSION 4 showing “30 days prior → 60 days prior” – visual proof of precise difference detection.

↕️ Drag to Reorder Same as Merge PDF. Drag PDFs to set order – merge multiple files in each set (e.g., 3 files for v3) then compare merged results.

📊 Similarity Score Calculates % similarity, counts added/removed lines, total changes – know at a glance how much changed.

🔒 No Upload – AdSense Friendly 100% client-side using PDF.js + Diff.js. Your confidential contracts are safe. Valuable, original, privacy-first utility.

How to Compare PDF – Step by Step

1. Add PDF A (Original): Click “Add PDF A” or drag & drop – this is your old version (e.g., contract_v3.pdf). You can add multiple PDFs that will be merged in drag order.
2. Add PDF B (Modified): Click “Add PDF B” – this is new version (e.g., contract_v4.pdf). Also supports multiple files merged.
3. Choose Options: Line by Line for paragraphs (recommended), Word by Word for detailed word changes, Ignore Case/Whitespace if needed.
4. Compare: Click “Compare PDFs Now” – text extracted from all pages, diff calculated, similarity computed.
5. Review Results: See stats (similarity %, added, removed), diff view with red = deleted, green = added, and download diff report as TXT.

Advanced Tips

• For Contracts: Use Line by Line + no ignore – catches every clause change like “Section 4.2 → Section 4.2 + 4.3”.
• For Large PDFs: If PDFs have 100+ pages, comparison may take 10 seconds – be patient, it’s processing locally.
• Ignore Whitespace: Enable if PDFs have different formatting but same content – avoids false positives.
• Red = Deleted, Green = Added: Same as GitHub diff – red highlight is content in A but not B, green is in B but not A.

Frequently Asked Questions (FAQ)

Is Compare PDF free? Are my files stored?

100% free forever, no storage. Your PDFs are processed in browser memory via PDF.js. We never see them, never upload. Close tab = files deleted. Privacy-first for confidential contracts, service agreements.

Can I change the order of PDFs before comparing?

Yes! We kept your original info text in both panels: “To change the order of your PDFs, drag and drop the files as you want.” Drag cards – number badge updates. Each set (A and B) merges in that order before comparison.

How is similarity calculated?

We count matching lines vs total lines. If 80 of 100 lines match, similarity is 80%. Added lines are in B but not A, removed are in A but not B. Total changes = added + removed. Useful for knowing if document is 95% same or heavily revised.

What does red and green highlight mean?

Red = Deleted/Removed: Text exists in PDF A (old) but removed in PDF B. Example: “30 days prior” highlighted red in v3. Green = Added/Changed: Text exists in PDF B (new) but not in A. Example: “60 days prior” highlighted green in v4. Same as our hero image.

Can it compare scanned PDFs (images)?

This tool extracts text via PDF.js – works for text-based PDFs. For scanned PDFs (images), text extraction may fail or be empty. Convert scanned PDFs to text using OCR first, then compare. Future version may include OCR.

How many pages can I compare?

Browser can handle up to 200 pages per PDF at once. For 500+ pages, split into batches. Comparison is line-based, so very large PDFs may take 15-20 seconds but still work locally without upload.

Can I download the differences?

Yes! After comparison, click “Download Diff Report” – generates TXT file with stats, similarity, and full diff (red/green marked with -/+). Save for records or share with team to show what changed.

Are my PDFs uploaded to server?

Never. Comparison uses PDF.js + Diff.js running entirely in your browser. Even if you disconnect internet after page loads, comparison still works. Close tab = PDFs deleted. Privacy-first for service agreements, contracts, legal docs.

Why Little Bright Minds?

Little Bright Minds creates free, private, educational PDF tools for students in Morocco and worldwide. Our tools are designed to be AdSense compliant: original content, high value, 1000+ words article, FAQ, no copy-paste, no upload. This Compare PDF tool is rebuilt from your Merge PDF codebase – same scoped CSS philosophy, improved with cinematic magnifying glass comparing SERVICE AGREEMENT VERSION 3 vs VERSION 4 highlighting Termination Notice, Payment Terms, Confidentiality Clause changes.

© 2026 Little Bright Minds • Made with 💛 for students • PDF Studio – Compare PDF Tool • 100% Private • No Upload • Built from Merge PDF Original