File Tools
Add Watermark to PDF
Stamp a PDF with multilingual text, emoji or a transparent logo. Preview the first page, choose a nine-grid position and export locally.
Your files are processed locally in your browser and never uploaded.
Your files are processed locally in your browser and never uploaded.
Sponsored linkLearn more →
How to use
- Choose a readable PDF and select Text or Image / logo.
- Set opacity, angle, position, spacing and a page range such as 1-3,5.
- Preview the first page, apply the watermark and download the page-preserving PDF.
Great for
- Confidential document labels
- Draft and copyright notices
- Branding reports with a logo
Private, local PDF processing
BrightTools reads the selected PDF in your browser and never uploads it. File contents, names and passwords are not sent to analytics. A shared 50 MB and 200-page safety limit keeps memory use predictable on phones and desktops.
Quality and validation
Compression renders each page at a bounded resolution, encodes it as JPEG and checks the real output bytes. Target-size pages use a finite coarse-to-fine search; they never delete pages or create blank or damaged PDFs. The result is reparsed to confirm page count and page dimensions before download.
Related PDF tools
Need to prepare a document first? Merge PDFs, split pages, organize pages, convert an image to PDF or export a PDF to images.
Good to know
Watermarks are embedded visual stamps. Original text remains intact, but the stamp itself is not editable as PDF text. Transparent logos are converted to PNG locally.
Frequently asked questions
Can I watermark only selected pages?
Yes. Enter a validated range such as 1-3,5; duplicate and out-of-range page numbers are rejected.
Does it support Chinese and emoji?
Yes. Text is rendered through the browser canvas and embedded as a crisp PNG stamp.
Can I use a logo?
Yes. PNG, JPG and WebP logos are accepted; transparency and aspect ratio are preserved.
You may also like
Compress PDF Online
Compress PDF files online in your browser with quality presets, grayscale and metadata controls. Files never leave your device.
Open tool →Merge PDF Files
Combine multiple PDF files in any order directly in your browser. Pages, sizes and orientation stay intact.
Open tool →Organize PDF Pages
Reorder, rotate and delete PDF pages locally, then export a new document without uploading the source.
Open tool →PDF to Image
Convert selected PDF pages to JPG or PNG locally with safe quality and resolution controls.
Open tool →