Compare PDF

Compare two PDF files side by side and see exactly what changed. Text differences are highlighted line by line — additions in green, removals in red. Free, private, all processed in your browser.

About Compare PDF

Spot the differences between two PDF versions without flicking between tabs. The tool reads the text from both documents with PDF.js and runs a diff algorithm to isolate exactly what changed. All processing happens in your browser — your files never leave your device.

Side-by-Side View

Original and modified documents rendered next to each other so every change is easy to scan and compare.

Text Diff

Line-by-line diff of the full text content using an LCS algorithm for accurate, ordered change detection.

Highlight Changes

Additions shown in green, removals in red, and edited lines get word-level highlighting to pinpoint edits.

100% Private

No upload, no account, no tracking. Both documents are processed locally in your browser only.

📋 Common Use Cases

Review Contract Revisions

Compare an original contract against a revised draft to see every clause, term, and number that changed before you sign.

Check Report Revisions

Verify that a co-worker's updated report or proposal only contains the intended edits — no accidental deletions.

Audit Published PDFs

Confirm a re-exported invoice, statement, or datasheet matches the original content with no silent changes.

Track Document Versions

Compare consecutive versions of policies, manuals, or terms to log exactly what changed between releases.

🪜 How to Use This Tool

Select PDF 1
Drag and drop or browse to choose the original PDF document into the left drop zone.

Select PDF 2
Choose the revised PDF into the right drop zone. The tool compares PDF 1 against PDF 2.

Compare PDFs
Click the Compare button. The text is extracted from both files and diffed locally in a moment.

Review the differences
Scan the side-by-side view: green for added text, red for removed text, word-level highlights on edits. Download a text report if you need one.

Frequently Asked Questions

Is this PDF comparison tool really free?▼

Yes. Every PDF tool on iluv.tools is completely free. No signup, no account, no payment. Everything runs in your browser.

Are my PDF files uploaded to a server?▼

No. Both PDFs are read locally in your browser using the PDF.js library. Your documents never leave your device.

What kind of differences does it detect?▼

The tool compares text content line by line. Added lines are highlighted in green, removed lines in red, and changed lines show word-level highlighting so you can spot the exact edit.

Does it compare scanned or image-only PDFs?▼

No. This tool compares text content. Scanned, image-only PDFs contain no text layer, so run them through the free PDF OCR tool first to make them comparable.

Is there a file size limit?▼

Browser-based tools handle files up to ~100MB smoothly. Larger files may be slower depending on your device. For very large PDFs, try splitting them first, processing the parts, then merging.

Can I use this on mobile?▼

Yes. All PDF tools work on mobile browsers (iOS Safari, Android Chrome). Desktop is recommended for large files, but everything is functional on mobile.