DoctorConverter
TR

Stamp Custom Text Watermark on PDF

Protect intellectual property and mark document status with diagonal, semi-transparent text watermarks.

Drop your file here

or choose from your device

PDF Files are only sent when you start the job.

Start the job

  • 10.0 MB per file
  • Up to 1 files
  • 300 pages
  • Kept for 60 minutes

Uploaded files are stored temporarily and removed when they expire. An accepted job keeps running even if you close the page.

Good to know
The result depends on the source document and the settings you choose.

3 easy steps

How to use Add Watermark to PDF

No software to install, just a few steps in your browser.

  1. 1

    Choose your file

    Choose your PDF document.

  2. 2

    Start the job

    Type your watermark text (e.g. CONFIDENTIAL, DRAFT).

  3. 3

    Download

    Download your watermarked PDF document.

Why DoctorConverter?

Free, no sign-up, and your files are only kept temporarily.

Semi-transparent

Diagonal stamp that remains clear and legible over existing content.

Free, no install

No software to download and no account to create. It runs in any browser.

Private by default

Encrypted transfer, session-only access and automatic deletion when files expire.

Frequently asked questions

Common questions about Add Watermark to PDF.

Can the watermark be easily removed?

The watermark is permanently rendered into the page layer for maximum protection.

Related tools

Compress PDF

Reduce your PDF file size for easier sharing and uploads.

Try it now →
Add Page Numbers

Insert page numbers into your PDF documents with ease.

Try it now →
Protect PDF

Encrypt and password-protect your sensitive PDF files.

Try it now →
SECURITY & ARCHITECTURE

Why DoctorConverter? Privacy and Performance Standards.

Isolated RAM Processing

Files are processed in an isolated sandbox environment without persistent storage and never shared with AI models.

Native Open-Source Engines

Powered by industry-standard QPDF, PyMuPDF, LibreOffice Impress and Tesseract OCR.

Instant Disposal & Zero Traces

Delete files immediately with one click after processing, or rely on automatic session cleanup.

Your Files Belong Strictly to You

DoctorConverter protects all data transfers with end-to-end TLS encryption. No document archives are kept on our infrastructure.

Frequently Asked Questions

Is DoctorConverter really free?

Yes. PDF conversion, merging, compression and all everyday document operations are 100% free with no sign-up.

Where do my files go and when are they deleted?

Your files are transmitted securely over TLS into memory. You can click "Delete files" anytime to erase them instantly, and the system automatically purges temporary data.

Does PDF to Word or Excel preserve the original layout?

Text-based PDFs are reconstructed into clean Word and Excel documents with typography, tables and columns preserved.

Which file formats are supported?

PDF, DOCX (Word), PPTX (PowerPoint), XLSX (Excel), JPG and PNG. Password-protected PDFs can be unlocked using our Unlock PDF tool.