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Miễn phí PDF Compare

Compare two PDFs page by page — side by side, as an onion-skin overlay, or with changed areas highlighted in red. Both files stay in your browser.

Không giới hạn kích thước tệpTệp vẫn riêng tưKhông cần đăng nhậpMiễn phí mãi mãi

Original (A)

Thả tệp vào đây hoặc nhấp để duyệt

PDF không giới hạn kích thước tệp

Duyệt tệp

Changed (B)

Thả tệp vào đây hoặc nhấp để duyệt

PDF không giới hạn kích thước tệp

Duyệt tệp

Tệp của bạn không bao giờ rời khỏi thiết bị. Toàn bộ xử lý diễn ra cục bộ trong trình duyệt của bạn.

Drop two PDFs to compare them page by page — side by side, as an onion-skin overlay, or with changed areas highlighted. Both files stay in your browser.

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Compare Two Contract Versions Review Document Revisions Compare Invoices or Statements Compare Design Proofs Compare Paper or Thesis Drafts

Cách hoạt động

Tools like Draftable and Adobe charge for good PDF comparison, and PDF24 uploads your files. This compares two PDFs visually in your browser — neither file leaves your device.

1
You drop in two PDFs
An "original" (A) and a "changed" (B). Both are rendered locally with pdf.js.
2
Each page is rendered to an image
The matching page from each document is drawn to a canvas at the same scale, in your browser.
3
You choose how to compare
Side by side, an onion-skin overlay with an opacity slider, or a pixel-difference view that highlights changed areas in red and reports the percentage changed.
4
You page through the documents
Step through every page; pages that exist in only one file are flagged.

Contracts and drafts are sensitive, and most comparison tools upload them. Here everything is rendered and compared on your device — ideal for reviewing revised agreements, statements, and documents privately.