Skip to main content

Compare PDF Files

Upload two PDFs and find every difference instantly — page thumbnails, side-by-side view, visual diff with highlight boxes, word-level text changes, and an annotated PDF export. Faster and more accurate than iLovePDF or Smallpdf.

Original PDF (A)

Drop or click to upload

No file selected

Modified PDF (B)

Drop or click to upload

No file selected
Tip: Drop the older/original version as PDF A and the newer/modified version as PDF B. We will analyze every page, highlight changes with bounding boxes, and let you download an annotated PDF.
100% Secure
Browser-side
Instant diffs
Page thumbnails
Annotated PDF export
100% Free

Try more free PDF tools

Merge PDF Split PDF Sign PDF PDF to Word Repair PDF AI PDF Summarizer

Compare PDF Files

Compare two PDF files side by side and spot every difference instantly. Highlights added, removed, and changed text with pixel-accurate visual diffs, page thumbnails, and an annotated PDF export.

Compare PDF — Find Differences Between Two PDF Versions

Need to know exactly what changed between the original contract and the revised version? Track edits in a research paper across drafts? Verify a vendor sent the same MoU you reviewed? Our Compare PDF tool highlights every textual and visual difference between two PDFs side by side — saving you hours of manual review.

Upload the original and revised PDFs. The tool highlights additions, deletions, and modifications visually so you spot every change at a glance. No signup for your first 2 tasks a day.

How to Compare PDFs

1. Upload Both PDFs

Upload the original PDF and the revised version. Both files are loaded for comparison.

2. Auto-Compare

The tool extracts text and structure from both files and runs a difference algorithm.

3. View Differences

See additions in green, deletions in red, modifications in yellow — pages displayed side-by-side.

4. Download Report

Export the highlighted comparison as a PDF or get a detailed change log.

PDF Comparison Features

Side-by-Side View

Original on the left, revised on the right, with both versions scrolling in sync.

Colour Coded

Green for additions, red for deletions, yellow for modifications — instantly recognisable.

Change Log

Get a structured list of every change — useful for legal reviews and audit trails.

Word and Line Diff

Toggle between word-level and line-level comparison for fine-grained or coarse-grained diffs.

Export Report

Download a PDF showing both versions with all changes highlighted — ideal for sharing with stakeholders.

Free and Private

Runs entirely in your browser. No signup and no watermark: 2 free tasks a day (3 with a free account).

Compare PDF — FAQs

Comparison works best on text-based PDFs. For scanned PDFs (images of pages), run them through OCR first to extract text, then compare. Pure visual comparison of scanned pages is supported but less accurate than text comparison.

It primarily detects content (text) differences. Formatting changes like font size or colour aren't always flagged unless they shift text positions noticeably. Visual diff mode helps catch layout-level differences.

No. Both PDFs are processed entirely in your browser. Even confidential legal documents and contracts stay private to your device.

Yes, completely free. No signup and no watermark: 2 free tasks a day (3 with a free account).