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UK Tenders

Free PDF Watermark Tool

Free PDF watermark tool. Add a custom text watermark to any PDF instantly — processed in your browser, nothing uploaded.

CT
Chandraketu Tripathi
Finance Editor, Kaeltripton
Published 31 Mar 2026
Last reviewed 11 May 2026
✓ Fact-checked
Free PDF Watermark Tool
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Free PDF Tool

Add Watermark.
Text Watermark. Free. Instant.

Add a custom text watermark to any PDF instantly. Processed entirely in your browser using pdf-lib — nothing uploaded.

No sign-up100% freeFiles never uploadedWorks on iPhone
PDF Watermark Tool
🔄
Drop your file here
or click to browse
PDF only · Max 100MB · Never uploaded
🔄
Processing...0%
Something went wrong. Please try a different file.
Done!
Your file is ready
🔒
100% private
Processed in your browser only
Instant
No waiting, no queue, no server
🗑
Auto deleted
Wiped from memory on download
📱
Works everywhere
iPhone, Android, any browser

Free PDF Watermark Tool — Add Text Watermark

Add a diagonal text watermark to every page of your PDF — custom text, opacity and font size. Processed using pdf-lib in your browser with nothing uploaded.

Frequently asked questions

Is this free?+
Yes — 100% free, no sign-up.
Can I customise the watermark?+
Yes — set the text, opacity and font size.
Does it work on iPhone?+
Yes — all modern browsers.
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Editorial Disclaimer

The content on Kaeltripton.com is for informational and educational purposes only and does not constitute financial, investment, tax, legal or regulatory advice. Kaeltripton.com is not authorised or regulated by the Financial Conduct Authority (FCA) and is not a financial adviser, mortgage broker, insurance intermediary or investment firm. Nothing on this site should be construed as a personal recommendation. Rates, figures and product details are indicative only, subject to change without notice, and should always be verified directly with the relevant provider, HMRC, the FCA register, the Bank of England, Ofgem or other appropriate authority before any financial decision is made. Past performance is not a reliable indicator of future results. If you require regulated financial advice, please consult a qualified adviser authorised by the FCA.

CT
Chandraketu Tripathi
Finance Editor · Kaeltripton.com
Chandraketu (CK) Tripathi, founder and lead editor of Kael Tripton. 22 years in finance and marketing across 23 markets. Writes on UK personal finance, tax, mortgages, insurance, energy, and investing. Sources: HMRC, FCA, Ofgem, BoE, ONS.

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