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FilesKit

Add a watermark to a PDF

Mark a document as confidential, a draft or a copy by stamping a text watermark across every page. The PDF is changed in your browser and saved as a new file, so the original stays untouched and nothing is uploaded.

PDFProcessed in your browser
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Features

  • Your own text

    Type any short text: CONFIDENTIAL, DRAFT, a company name or a date. English letters become real PDF text; other scripts such as Bengali are drawn as a transparent picture so they display correctly.

  • Size, direction, colour and opacity

    Choose a small, medium or large watermark, diagonal or horizontal, in grey, red, blue or black, with an opacity from 5% to 100% so the page underneath stays readable.

  • One in the middle or repeated

    Place a single watermark in the centre of each page, or repeat smaller copies over the whole page to make it harder to crop out.

  • Works with rotated pages

    Pages that are rotated in the PDF still get an upright watermark, and pages of different sizes are each stamped to fit.

  • Batch processing

    Watermark up to 20 PDFs in one run and download them separately or as a ZIP.

How to use Watermark PDF

  1. Choose one or more PDFs, or drop them onto the page.
  2. Type the watermark text and choose its size, direction, colour and opacity.
  3. Select Add the watermark.
  4. Download the new PDFs, or all of them as a ZIP.

Supported formats

AcceptsPDF
ProducesPDF

The watermark is added on top of the existing page content.

Limits and things to know

  • The watermark is drawn over the page content. It is not a security feature: anyone with a PDF editor can remove it.
  • Text in non-Latin scripts becomes an image, so it cannot be selected or searched. Latin text stays real text.
  • Password-protected PDFs are not supported. Remove the password first.
  • One text per run, the same on every page. Page numbers have their own tool.
  • Up to 20 PDFs, 100 MB each and 300 MB in total. Damaged PDFs are reported by name.

Privacy and processing

The PDF is read and rewritten in your browser with a PDF library. The watermark picture for non-Latin text is drawn on a canvas in your browser too. Your file is not sent to FilesKit, which has no server that receives files.

Common uses

  • Mark documents as confidential

    Stamp contracts, reports and offers before you share them outside your team.

  • Show that a file is a draft

    Make it obvious that a document is a draft, a sample or not yet approved.

  • Protect previews

    Add a visible mark to a sample you send to a client so the preview cannot be passed off as the final file.

  • Brand a document

    Put a company name or a project label on every page of a handout.

How this differs from other approaches

Online watermark services upload your document, which is a poor fit for confidential files. Desktop PDF editors offer image watermarks, per-page ranges and removal protection. FilesKit does text watermarks quickly on your own device.

Frequently asked questions

Is my PDF uploaded?

No. The watermark is added in your browser and FilesKit has no server that receives your files.

Can the watermark be removed?

Yes, by someone with a PDF editor, because it sits on top of the page. It marks a document; it does not lock it.

Does it work with Bengali text?

Yes. Bengali and other non-Latin text is drawn as a transparent picture using a font from your device. The result looks right but cannot be selected as text.

Will the original file change?

No. You download a new file with “-watermarked” added to its name, and your original stays as it was.

Can I add a picture or logo instead?

Not in this tool; it adds text only. Images to PDF can place images on pages.

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