No upload, 100% local, no account

Bates stamp a PDF

Enter a prefix (e.g. ACME-), choose the digit width and starting number. The sequential Bates label is stamped on every page, entirely in your browser, nothing is uploaded.

How Bates Numbering works

Bates numbering stamps sequential, uniquely identifying labels on every page of a PDF, a fixed prefix, a zero-padded running number and an optional suffix (for example ABC-000123). It is the standard for legal discovery, accounting and any workflow that must reference exact pages reliably.

It differs from plain page numbers: Bates labels are designed to stay unique across an entire production, with consistent padding and a custom prefix. For simple page numbers use Add page numbers, and for free-form margin text with tokens use Header & Footer. The prefix, digit padding, starting value and optional suffix are all configurable, so the labels match your firm or case numbering scheme exactly.

Frequently asked questions

How is Bates numbering different from adding page numbers?

Plain page numbers restart per document and are meant for readers. Bates labels carry a prefix and fixed-width numbering so each page has a unique identifier across a whole set of documents, essential in legal and audit contexts.

Can I set the starting number, padding and prefix/suffix?

Yes. Choose the prefix, the number of digits (zero-padding), the starting value and an optional suffix, so the labels match your firm or case numbering scheme exactly.

Are my files uploaded to a server?

No. Every operation runs inside your browser tab using JavaScript and WebAssembly. Your file is read into memory on your own device, processed there, and the result is offered as a local download. Nothing is transmitted to Sunasty or any third party. You can verify it yourself: open your browser DevTools, go to the Network tab, and watch, no request carries your file.

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.