Compare the text of two PDFs

Compare the text of two PDFs and instantly see which lines were added or removed. Handy for checking different versions of a document side by side. Free and local in your browser.

Original

PDF 1

Drop here or click to choose

Files stay on your device — nothing is uploaded

Modified

PDF 2

Drop here or click to choose

Files stay on your device — nothing is uploaded

Compares the extracted text of both PDFs line by line. Works best on PDFs with a real text layer (not scans).

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Your file is processed in your browser and never uploaded.

How does it work?

1
Choose PDF 1
The original document.
2
Choose PDF 2
The modified version.
3
Compare
You instantly see which text lines were added or removed.

Frequently asked questions

Which PDF files work best?

PDFs with a real text layer. Scanned documents without OCR contain no text and will appear empty.

Are images also compared?

No, only the text content is compared.

How large can the files be?

There is no hard limit, but very large PDFs may take a moment. The tool caps at 2000 lines per file.

Are my files uploaded?

No. Everything happens in your own browser. Your file never leaves your device and is not stored anywhere.

Is it free?

Yes, completely free, without watermark or account. The site is paid for by ads.

Why in the browser?

PDFrust runs entirely in your browser using WebAssembly and modern JavaScript libraries such as pdf-lib and PDF.js. Your file is never sent to a server — all processing happens locally on your device. This means your documents remain private by design, regardless of what they contain. There is no account required, no file size limit, and nothing is stored after you close the tab.