How to Add a Watermark to a PDF — Free, No Login
Marking a document as CONFIDENTIAL, DRAFT, or SAMPLE before sharing it usually means downloading extra software or uploading a sensitive file to a stranger's server. This guide covers how to stamp a text watermark onto every page of a PDF entirely in your browser — no login, no upload — plus how to pick a position and opacity that label the document without making it unreadable.
How to Add a Watermark — Step by Step
Open the Watermark Tool
Go to shrinkpdf.fyi/watermark.html. No sign-up, no email required.
Upload Your PDF
Click Choose PDF File or drag and drop. The tool reads the page count so you know the watermark will apply to the whole document.
Type the Watermark Text
Enter any text up to 60 characters — "CONFIDENTIAL", "DRAFT", "SAMPLE", or your own wording.
Set Position, Colour and Opacity
Choose diagonal, centred, or bottom placement, pick a colour, and adjust opacity so the watermark doesn't obscure the content underneath.
Add Watermark and Download
Click Add Watermark. The finished PDF is generated instantly in your browser and downloads straight to your device.
Choosing Position, Colour and Opacity
The single biggest factor in whether a watermark looks professional or looks like it's ruining the document is opacity. Around 20-30% keeps text and images fully readable underneath while still being clearly visible. Higher opacity (50%+) is useful when the watermark itself is the point — for example, marking a sample document as unusable for anything but review.
Diagonal placement across the centre of the page is the standard choice for "CONFIDENTIAL" or "DRAFT" style watermarks — it's harder to crop out of a screenshot or printed copy than a small corner stamp. A bottom watermark works better for a subtler mark, such as a company name on a quotation, where you don't want it competing visually with the main content.
Gray is the safest default colour for most documents since it reads as neutral rather than urgent. Red draws more attention and suits genuinely time-sensitive labels like "VOID" or "EXPIRED".
Common Reasons to Watermark a PDF
Mark a document "DRAFT" while it's still under review, so nobody mistakes an early version for the final, signed copy. Once approved, watermark a clean final version or send the unwatermarked original.
Stamp "CONFIDENTIAL" on financial statements, HR files, or internal reports before emailing them, so it's visually clear the file isn't meant to be forwarded freely.
Watermark portfolio samples, mockups, or quotations with a business name or "SAMPLE" so draft work isn't reused without payment.
Watermark, Then Compress or Number
Watermarking adds a small amount of page content, so file size barely changes — it's not a substitute for compression. If the watermarked file still needs to fit a portal's upload limit, run it through ShrinkPDF's Compress tool after watermarking (see the complete compression guide).
If the document also needs page numbers — common for contracts and reports — use the Add Page Numbers tool either before or after watermarking; the two don't interfere with each other since they're drawn in different positions on the page.
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