How to Add a Watermark to a PDF (DRAFT, CONFIDENTIAL, Your Name)

To add a watermark to a PDF, open the watermark PDF tool, choose your file, type the text (for example CONFIDENTIAL, DRAFT or your name) in the Watermark text box, press Add watermark and download the result. The text is drawn in light grey, diagonally across the middle of every page, and the whole job runs in your browser, so the document is not uploaded.

This guide explains exactly what the tool draws, how long your text can be before it runs off the page, what to write, how to watermark ID copies you give for KYC, and, just as important, what a watermark cannot protect you from.

Step by step

1. Open the watermark PDF tool and tap Choose a file, or drag the PDF onto the drop area on a computer.
2. Type your text in the Watermark text box. Keep it short; the next sections explain why.
3. Press Add watermark. When "Your PDF is ready" appears, press Download PDF. The file is saved as ethicalfusion-watermark-pdf.pdf.
4. Open the downloaded file and check a couple of pages before you send it.

What the tool draws, exactly

The watermark has a fixed style, so you know in advance what you will get:

• Text only, in one line, in a bold sans-serif font (Helvetica Bold).
• Mid-grey at 22% opacity, so the page underneath stays readable.
• At 45°, running from the lower left towards the upper right through the middle of the page.
• Sized to the page: the font size is one-seventh of the page's shorter side. On an A4 page that is 85 points, so capital letters are a little over 2 cm tall.
• On every page, in the same position.

There are no settings for colour, size, position, opacity, an image or logo, or choosing pages. The text must use English letters, numbers and common punctuation: the © sign works, but the ₹ sign, Hindi or other Indian scripts make the tool stop with an error ("WinAnsi cannot encode"), because the built-in PDF font does not contain those characters.

How long can the text be?

Because the size is fixed by the page, long text simply runs off the edge. We measured real text on an upright A4 page and on a wide page (shaped like a photo of an ID card, or an A4 page turned sideways):

As a rule of thumb, on an upright page keep to about 16 characters in mixed case, or 12–13 in capitals. On a wide page, keep to about 12 characters in mixed case, or 10 in capitals. Capitals take more room than small letters, so "Draft copy" fits where "DRAFT COPY NOT FINAL" does not.

What to write

• DRAFT or NOT FINAL: stops people treating a working version as the agreed one.
• CONFIDENTIAL or INTERNAL ONLY: tells every reader the document is not for passing on.
• SAMPLE or COPY: marks a specimen or duplicate, so it is not mistaken for an original.
• Your name or business (© Priya Nair, or a short website address): marks ownership of a portfolio, proposal, design or notes you share.
• Purpose and date: for ID copies, see the KYC section below.

Placement and opacity tips

The tool's placement and opacity are fixed, but these points help you judge the result, and apply if you ever use a PDF editor with more controls:

• Cross the content, not the margin. A watermark in a corner can be cropped off in seconds. One running across the middle, over the text or photo, is much harder to remove cleanly. That is why this tool puts it there.
• Light enough to read through. Around 20–30% opacity keeps every word readable under the watermark. Much darker hides the content; much lighter can almost vanish on some printers and photocopiers, so print one page to check if the document will be printed.
• Watermark last. Combine files with the merge PDF tool, remove unwanted pages and fix rotation first, then add the watermark so it covers the final set of pages. Add page numbers after that if you need them; the guide to adding page numbers to a PDF shows the format they take.
• Only some pages? Extract those pages with the split PDF tool, watermark that file, then merge the parts back together in the right order.

Watermarking ID copies for KYC: a useful habit

Banks, telecom companies, landlords and employers routinely ask for copies of your PAN, Aadhaar, passport or driving licence. A widely recommended habit is to mark every copy with who it is for and when, such as "For SBI account opening only, 15/10/2026", and to sign across it. If the copy is later misused, for example to open an account or take a SIM in your name, the note shows it was given for a different purpose. Treat this as a deterrent and a record, not a guarantee.

How to do it with this tool, within its one-line limit:

1. Make the copy upright. Photograph the card lying on a sheet of white A4 paper with the phone held upright, or scan it on A4. An upright page gives you room for about 16 characters instead of 12.
2. Turn the photo into a PDF with the JPG to PDF converter. If the page comes out sideways, the guide to converting JPG to PDF explains the quick fix.
3. Watermark a short, specific note such as "SBI KYC 15/10/26". On a wide card-shaped page, "SBI KYC only" fits.
4. For the full sentence, write it by hand across the paper copy, with your signature, before you photograph or scan it, and use the digital watermark as a second layer.

Two more points for Aadhaar. UIDAI offers a masked Aadhaar, downloadable from the myAadhaar portal or the mAadhaar app, in which the first eight digits are replaced by "xxxx-xxxx" and only the last four show; use it wherever the organisation accepts it. And the downloaded e-Aadhaar PDF is password-protected. The watermark tool cannot work on password-protected files: in our test it produced a file that would not open even with the correct password. Open the e-Aadhaar with its password and print it to a new PDF (Microsoft Print to PDF on Windows, Save as PDF on Android or Mac) before watermarking, or work from a photo of the card.

What a watermark does not prevent

A watermark is a label and a deterrent. It is not security, and it is worth being clear about its limits. (Keeping the file off other people's servers in the first place is covered in the guide to editing PDFs without uploading.)

• It can be removed. The tool adds the watermark as text on top of each page. Anyone with a full PDF editor can select it and delete it, and on an image a determined person can crop or paint it out.
• It does not stop opening, copying, printing or forwarding. For that you need password protection or a document-sharing service with access controls. This site's PDF tools cannot add passwords.
• It proves nothing about authenticity. Anyone can type CONFIDENTIAL on any file. Signatures and official seals, not watermarks, show who issued a document.

If you want the watermark to be harder to strip, you can "flatten" it into the page: convert the watermarked PDF to images with the PDF to JPG converter, then turn the images back into a PDF. The watermark becomes part of each page picture rather than a separate text item. The cost is a larger file, text that can no longer be selected or searched, slightly lower sharpness and a limit of 30 pages per conversion, so do it only for short, sensitive documents.

Frequently asked questions

How do I add my name as a watermark to a PDF?

Type your name, or "© Your Name", in the Watermark text box and press Add watermark. Keep it to about 16 characters so it fits across an upright page.

Can I add a logo or image as a watermark?

Not with this tool, which adds text only. For a logo watermark you need a desktop PDF editor with a watermark feature.

Can I change the colour, size or transparency?

No. Every watermark is mid-grey at 22% opacity, at 45°, sized to the page. This suits drafts, confidential copies and ID copies; for anything else you need a PDF editor.

Can I write the watermark in Hindi or include the ₹ sign?

No. The tool uses a built-in PDF font that covers English letters, numbers and common symbols such as ©, and it shows an error for other characters. Write "Rs" instead of ₹.

Can someone remove my watermark?

Yes, with enough effort. It discourages casual misuse and records your intent, but it is not a lock. Flattening the PDF into images makes removal harder, not impossible.

Does it work on a phone?

Yes. Open the tool in your phone's browser, choose the PDF from Files or Downloads, type the text and download the watermarked copy.

Sources: UIDAI, "What is Masked Aadhaar?" and e-Aadhaar FAQs; watermark style, text widths and password-protected file behaviour tested by running the site's watermark PDF tool in Chrome, October 2026.