Watermark PDF

Stamp diagonal text — CONFIDENTIAL, DRAFT, PAID, your brand — across every page, with adjustable opacity.

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What is the Watermark PDF tool?

The Watermark tool stamps diagonal text across every page of a PDF — CONFIDENTIAL, DRAFT, SAMPLE, PAID, a client name or your brand. You control the wording and the opacity, so the mark can be a whisper in the background or an unmissable banner. It’s the standard way to label document status and discourage unauthorized reuse before you share a file.

Key features

  • Any custom text — status labels, names, dates, brands
  • Opacity control from 5% (subtle) to 100% (bold)
  • Classic 35° diagonal placement across the page
  • Text auto-sizes to the page so long phrases still fit
  • Applied to every page in one pass, on your device

How do I use it?

  1. Drop the PDF you want to mark.
  2. Type the watermark text (default: CONFIDENTIAL) and set opacity.
  3. Click Apply & download.
  4. Every page of the downloaded copy carries the diagonal watermark.

Is it safe to watermark a PDF online?

Yes. The watermark text is drawn into each page locally, in your browser — the document is never uploaded. Note that a visible watermark is a deterrent and a status label, not encryption: someone determined can still read the underlying content, so for secrecy also control who receives the file.

Tips for the best result

  • 15–25% opacity marks a page clearly without hurting readability.
  • Use dates in the text (e.g. “DRAFT — July 2026”) for version control.
  • Watermark the copy you send, keep your clean original.
  • For photos-as-PDF, a slightly higher opacity (30–40%) reads better.

Watermark a PDF online. Add a text watermark such as DRAFT, CONFIDENTIAL, PAID or SAMPLE, put your company name across a document, or mark a version with a date — a free PDF watermarker in your browser. The guide to adding a watermark to a PDF covers opacity, wording and removal.

Watermark online — add a watermark to a PDF

Use this tool to add a text watermark such as DRAFT or CONFIDENTIAL diagonally across every page: type the wording, set the opacity and download. To add a logo instead, place it as an image in the PDF editor; this tool stamps text.

Watermark online free. Add a text watermark to any PDF in your browser — no upload, no account and no daily limit.

Frequently asked questions

What text can I use as a watermark?

Anything — CONFIDENTIAL, DRAFT, SAMPLE, PAID, a client’s name, your company, a date. The text auto-scales to fit the page diagonally. One or two short words read best; a long sentence becomes small when it is scaled across the page.

Can I control how strong the watermark looks?

Yes — set opacity from 5% to 100%. Around 20% is visible but keeps the document easy to read. Print one page as a test if the document will be printed, because opacity can look different on paper.

Is the watermark applied to all pages?

Yes, every page gets the same diagonal stamp in one pass. If you only need it on some pages, split the PDF first, watermark that part and merge the files again.

Can a watermark be removed later?

A visible watermark deters casual reuse but is not tamper-proof; treat it as labeling, not security. For stronger protection, share only the pages people need and keep the unmarked original to yourself.

Will watermarking blur my document?

No — the mark is a crisp text layer drawn over the page; the underlying content is unchanged. The page underneath keeps its original sharpness, so the document stays easy to read and print.

Is my file uploaded to watermark it?

No. Everything happens in your browser and the PDF never leaves your device. That keeps client documents and drafts private while you label them.

How do I watermark a PDF for free?

Select the PDF, type your watermark text (for example CONFIDENTIAL or DRAFT), set the opacity and download. The same diagonal watermark is added to every page, in your browser, with no upload or sign-up.

How do I add a watermark to a PDF?

Open the PDF, type the watermark text (for example DRAFT or CONFIDENTIAL), set the opacity and click Apply & download. Every page of the new copy carries the diagonal watermark.

How do I add a DRAFT watermark to a PDF?

Type DRAFT (or DRAFT — with a date) as the watermark text, choose 15–25% opacity so the content stays readable, and download. Remove it by exporting a fresh copy from the original once the document is final.

Related tools: Page Numbers · Compress PDF · Merge PDF

Add a DRAFT or CONFIDENTIAL watermark with enough transparency to keep the page readable. A watermark labels a document; it does not control copying or access.

🔒 Privacy: this tool runs entirely in your browser. Your file is never uploaded, stored, or shared. LyfPDF offers 33 free PDF tools, including 12 core tools localized in 7 languages, with 0 uploads — learn how it works.