Protect your documents, mark drafts, or brand your PDFs with a diagonal text watermark. Folium's Add Watermark tool stamps custom text across every page at your chosen opacity — instantly, in your browser, with no file upload to any server.
Enter any watermark text — CONFIDENTIAL, DRAFT, your company name, or anything else.
Light (15%), Medium (30%), or Heavy (50%) — choose how prominent the stamp appears.
Your PDF never leaves your device. All stamping happens inside your browser.
The watermark is applied to every page of the PDF simultaneously.
Drop your PDF or click Choose File. Any PDF size is supported.
Type your watermark text (e.g. CONFIDENTIAL, DRAFT, DO NOT COPY) and choose an opacity level.
Click Add Watermark. Your stamped PDF downloads immediately with the diagonal text on every page.
Mark in-progress reports and proposals as DRAFT before sharing for review.
Add CONFIDENTIAL to sensitive documents before distributing to limited audiences.
Stamp PROOF or SAMPLE across design or contract previews before final sign-off.
Add your company name or website URL as a watermark to branded PDF documents.
Watermarking is performed entirely within your browser using pdf-lib. The tool reads your PDF from local memory, draws the watermark text onto each page's canvas, and saves the resulting file back to your device. No data is ever uploaded to any server.
Add a watermark to PDF online for free with Folium — custom text, three opacity levels, no upload, no signup. Stamp CONFIDENTIAL, DRAFT, or any text across every page in seconds. Completely private and free.