整理

Compare PDFs

Compare two PDFs side by side and highlight page-by-page text differences. 在此设备上运行

添加文件

您的文档仅保留在浏览器中。

仅限PDF文件

将文件拖放至此或从设备中选择选择文件仅限PDF文件

Choose a local file to begin.

无上传队列

您的文档仅保留在浏览器中。

无需帐户

无需登录或服务器存储。

完成后清除

使用清除按钮立即释放数据。

指南

如何使用 Compare PDFs

Compare two PDF files page-by-page and generate a visual diff report highlighting every pixel and text change in red.

输入Two PDF files (Original version and Revised version).

输出One visual diff PDF showing Original, Revised, and Red Diff Overlay side-by-side for each page.

隐私仅在此标签页中处理。

About compare two PDFs

Compare two PDF files page-by-page and generate a visual diff report highlighting every pixel and text change in red. Verify that a counterparty did not slip unapproved edits into a contract before signing, or check design proof revisions across pages.

If a paragraph insertion pushes all subsequent text down the page, everything below the insertion will highlight as visually shifted on that page.

How PDFolio helps you compare two PDFs

PDFolio renders matching pages from both PDFs onto offscreen canvases, compares RGB pixel values at every coordinate, highlights changed pixels in crimson, and pairs that with a text-layer comparison.

If you only want to inspect hidden metadata differences in a single file, use Privacy Scanner.

Before you download

Even subtle font shifts, signature marks, or a single changed digit in a table will light up clearly in the red diff panel.

When the result is ready, download it immediately and open it in your usual PDF viewer to make a final check. You can then use Clear task data to release temporary file references from this browser tab. PDFolio does not create an account, cloud folder, or server-side document history.

A private way to compare two PDFs

PDFolio handles the selected files in the active browser tab. A Web Worker on your device performs the PDF task so the interface can remain responsive; document bytes are not sent to a PDF processing server, upload queue, account database, or advertising platform.

步骤

Add the original PDF first and the revised PDF second.
Click Process to run both text comparison and pixel-level visual diffing.
Check the summary banner for changed pages and download the side-by-side comparison PDF.

注意事项： Every page in the downloaded report displays three panels: File A (Original), File B (Revised), and the Visual Diff with changes highlighted in red.

常见问题

Does Compare PDFs catch changes inside images and signatures as well as text?

Yes. Because it performs a pixel-by-pixel visual comparison alongside text comparison, any altered signature, logo, or number is highlighted.

Are confidential contracts uploaded when comparing?

Never. Both PDFs stay inside your local browser tab.

Does compare two PDFs change my original file?

No. PDFolio creates a new file for download. Your source file remains unchanged on your device.