Add a custom text watermark with size, color, opacity and position controls.
Private · Processed in your browser · No upload
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One PDF file
Browse FilesFiles stay on your device. Around 100 MB is a practical guide — actual limits depend on your browser and memory.
A watermark marks a document as yours, as a draft, or as confidential — before it leaves your hands. Toolzio's Watermark PDF tool adds a custom text watermark with size, color, opacity, and position controls, free and without an account, entirely in your browser. Your file is never uploaded to a server, which is exactly what you want for the documents that most need watermarking: drafts, quotes, contracts, and unpublished work.
Choose the words, then tune how they appear. A large, dark watermark across the centre is hard to miss and hard to crop out, which suits confidential drafts; a small, pale watermark in a corner stays readable and unobtrusive, which suits a finished document that simply needs an owner's mark. Opacity is the control that matters most: too faint and the mark is pointless, too strong and it fights the content underneath. Set it, preview it, and adjust it before you commit — the right setting is the one you can see without having to look for it, on the lightest and the darkest pages alike.
A text watermark is a visible claim, not a security lock: it discourages casual reuse and makes the document's status obvious, but a determined person with editing software can remove a watermark. If a document must not be altered at all, a watermark alone is not enough. Watermarking cannot unlock an encrypted PDF, so unlock a protected file first. After applying it, open the result and check a few pages — especially the densest ones — to confirm the mark sits where you intended and does not bury anything important.
The words themselves are worth choosing carefully. A company name marks ownership, a word like CONFIDENTIAL or DRAFT marks status, and adding a date to a draft watermark stops an old version being mistaken for the current one later. Use the same wording across a set of related documents so the whole set reads consistently — a quote, an invoice, and a proposal that all carry the same mark look like they came from the same place. And apply the watermark to the copy you send, not to your only master copy: once a watermark is part of a file, removing it cleanly takes editing software, so keep an unmarked original for yourself.
Very large files are limited by your device memory. Encrypted PDFs must be unlocked first. This is a focused single-purpose tool, not a full desktop PDF suite.
Privacy: your file is read by your browser only. Toolzio does not upload, store, or log your document contents for this tool.
Yes. Watermarking is free, with no account required, and the marked file is generated in your browser.
Yes. Size, color, opacity, and position are all adjustable — opacity matters most for balancing visibility against readability.
No. A watermark is a visible claim that discourages casual reuse; it is not a lock, and editing software can remove it.
No. Your file is processed locally in your browser and never leaves your device through Toolzio.
Add page numbers in your choice of position, format, size and color.
Open the Add Page Numbers tool →Add text, images and rectangles on top of PDF pages and export the result.
Open the Edit PDF tool →View and edit a PDF's title, author, subject, keywords, creator and producer.
Open the PDF Metadata tool →
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