Why are the hashes truncated to 16 chars?

For TSV readability. 16 hex chars = 64 bits of hash space — collision probability is negligible for the typical use case (a few hundred pages). For cryptographic certainty use a real SHA-256 tool.

PDF Page-by-Page Checksum

Compute a SHA-256 checksum of each page's content stream. Use to detect which page(s) changed between revisions of an otherwise-identical PDF.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your files (min 1)

Drop PDF files here

or click to browse (max 5)

Need at least 1 file (have 0).

How does the PDF Page-by-Page Checksum work?

Hash every page's content stream with SHA-256 (truncated to 16 hex chars for compact display) and report a TSV grid: rows are pages, columns are input files. Mismatched pages — where the hashes differ across files — are summarised at the end. Useful for tracking exactly which pages changed across N revisions of the same document, especially when text-diff results are noisy because of trivial reformatting.

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.

Frequently asked

The whole-page object includes resource references that change frequently (font ID renumbering, etc.) without the visible page actually changing. The content stream is what you see on the page; hashing it captures meaningful change.