AccDox: PDF Watermark

Add a text watermark to all or selected pages — no server upload

Drop a PDF file here or click to choose

Your file is processed entirely locally in your browser — never uploaded to a server. (Max 20 MB.)

AccDox Watermark lets you stamp PDF documents right in your browser — fast, free, and completely secure for your files.

Need to merge several PDF files into one?

Try PDF Merge →

Need to split a PDF into pages?

Try PDF Split →

Want to turn photos into a PDF?

Try Image to PDF →

Frequently Asked Questions (FAQ)

No. The entire process — reading the PDF, showing the preview, adding the watermark, and generating the new file — happens locally in your browser using the pdf-lib (processing) and pdf.js (preview) JavaScript libraries.

Yes. Once you choose a PDF, its first page is shown in the preview and the watermark is drawn over it live — it updates instantly whenever you change the text, size, opacity, rotation, color or position. Only the first page is shown, even if the document has more.

The preview and the final file use the same position calculation, so the watermark will be at practically the same place. Very small differences in how the letters are rendered are possible. The font size is in real PDF units, so if the pages in your document have different sizes, the watermark will look proportionally larger or smaller on them than in the preview of the first page.

Yes, choose the "Page range" option and set a start and end page. If page 1 is not in the selected range, the preview tells you that it will not get a watermark.

You can pick any color with the color picker and adjust opacity from 5% to 100%.

Yes, the maximum file size is 20 MB.

The watermark text repeats at regular intervals across the whole page, and the grid rotates together with the text — useful for protecting image-heavy content from copying.

Yes. The tool takes the page rotation into account, so the watermark appears just as you see it in the preview. Scanned documents are supported too; most files with a non-standard internal structure are repaired automatically when loaded.

The tool uses the standard Helvetica Bold font, which supports basic Latin letters, digits, punctuation and Western European accented letters (e.g. é, ö, ü, ç). Cyrillic and some Turkish letters (ş, ğ, İ, ı) are not supported. If you type such characters, you will see a message right in the preview. We recommend Latin text (e.g. "CONFIDENTIAL").

No. Password-protected files cannot be processed. Remove the protection in the program you created the file with and try again.

Yes, after processing a "Download PDF" button appears that saves the finished file to your device. If you change the settings afterwards, the button is hidden and you need to add the watermark again, so you never download an outdated file.