Stamp diagonal or custom text across every page. 100% free, no sign-up — your file never leaves this browser tab.
Watermark PDF lets you watermark a PDF entirely inside your browser, with no software to install and no account to create. Like every tool on Techsinghge Smart Tools, it's built around adding a finishing touch to a document — text, numbers, images, or metadata, and it works the same way whether you're on a laptop, a Chromebook, or a phone.
Under the hood, Watermark PDF takes one PDF file and custom text and hands back a PDF with your text stamped across every page. Your file is loaded directly into this page's memory using JavaScript — nothing is transmitted to a server, which means there's no upload wait, no file-size cap tied to a paid plan, and no copy of your document left sitting on someone else's storage once you're done.
Marking a draft contract as “draft” before sending it out is one of the most common reasons people reach for this tool, but it works just as well for adding a “CONFIDENTIAL” stamp to internal reports. If you need a related step before or after this one, check the related tools further down the page — every tool on this site is designed to slot into the same drag-and-drop workflow.
No installs, no accounts — just your browser doing the work.
Scroll up (or tap “Use Watermark PDF now”) to load the tool instantly — no account or install needed.
Drag and drop one PDF file and custom text into the drop zone below, or click it to browse your device.
Adjust whatever settings this tool offers so the result comes out exactly how you want it — sensible defaults are already selected.
Click Run, then download a PDF with your text stamped across every page straight to your device — it's generated locally and ready in seconds.
Stamp text at an angle across the page, or position it exactly where you want.
Fine-tune the watermark so it's visible without overwhelming the underlying content.
Your one PDF file and custom text stays on this device the whole time — nothing is uploaded, logged, or stored on a server.
Processing happens right in this browser tab, so there's no upload progress bar, no server queue, and no processing fee.
Because Watermark PDF runs locally, teams handling sensitive paperwork — legal, HR, healthcare admin, finance — can use it without the compliance questions that come with uploading documents to a third-party server. And if you only need it for a single one-off task, it's just as useful with zero setup and nothing to remember to delete afterwards.
This tool creates a new watermarked file and doesn't modify your original, so the source PDF stays clean if you need it again.
By default yes — it's applied consistently across the whole document for a uniform look.
Yes — completely free, with no hidden page limits, no sign-up, and no watermark added to a PDF with your text stamped across every page.
No. Watermark PDF runs entirely in your browser using JavaScript libraries like pdf-lib and pdf.js. Your one PDF file and custom text never leaves this device.
Yes, Watermark PDF works in any modern mobile or desktop browser — there's no app to install and no separate mobile version to download.