PDF guides4 min read
How to add a watermark to a PDF
Stamp DRAFT, CONFIDENTIAL or your name across a PDF so everyone knows what they're looking at.
A watermark tells people what they're holding. DRAFT, CONFIDENTIAL, or a company name across the page gets the message across even when the cover email is long gone and all that's left is a printout on someone's desk.
It's a label, not a lock. A watermark makes it obvious when a document is being passed around where it shouldn't be, and it makes reusing it awkward. It won't stop someone from copying it, and a determined person can remove it.
The hard part is getting the strength right. Too faint and it disappears when printed. Too strong and it fights with the text underneath. An opacity of about a quarter to a third usually works on screen and survives a black-and-white printer, but pages differ, so check the busiest page in the document.
Placement matters too. A big diagonal mark across the middle is hard to crop out and you notice it straight away, which is what you want for drafts. A small mark in the corner keeps things like drawings and financial tables clear, but it's much easier to cut off.
When you might need this
- You want to mark a document as a draft, confidential or for review.
- You want to show who owns it or who it's for, even on paper.
- You'd like to discourage people from reusing copies you've shared.
- You need to tell a working version apart from the approved final one.
- You're sending out a sample or preview and want it marked as one.
How to do it
- Open Watermark PDF.
- Add the document you want to mark.
- Type the watermark text and set how it looks: size, angle and opacity.
- Apply it and download the result.
- Look through every page. A watermark that's easy to read on a text page can vanish over a dark chart.
Free, with no account. Open it in a new tab and follow along.
Open Watermark PDFTips
- Make it strong enough to read, but light enough that the content underneath stays clear.
- Keep it off signatures, charts and important numbers.
- A diagonal watermark across the page is harder to crop out than a small one in a corner.
- Keep the text short. DRAFT and CONFIDENTIAL work because you can read them at a glance.
- Watermark a copy, not your only version. The mark becomes part of the page and can't be peeled off later.
- Check the busiest page, not the title page. A mark that's clear over white space can disappear over a dark chart.
- If different people need different marks, watermark a clean copy each time instead of stacking marks on an already marked file.
Common mistakes
- Setting the opacity so low that the mark vanishes when printed in black and white.
- Putting the watermark over a signature or an important chart.
- Watermarking your only copy and losing the clean original.
- Thinking a watermark stops copying. It's a label.
- Forgetting to remove DRAFT before sending out the final version. That's the one that reaches the most people.
- Watermarking a digitally signed PDF. Changing the page breaks the signature.
How this compares to Smallpdf, iLovePDF and Adobe
On Smallpdf and iLovePDF, adding a watermark means the usual upload and counts against your free allowance. Watermarking tends to happen in batches, one mark on every draft in a folder, so those allowances run out quickly.
Adobe does watermarks properly in desktop Acrobat, with a subscription.
Doing it in your browser means no upload, no counter and no cost, so you can mark a whole folder of drafts in one go. And the documents that most need a CONFIDENTIAL stamp are usually the ones you least want to upload.
| Criterion | Smallpdf | iLovePDF | Adobe Acrobat online | Easy File Tools |
|---|---|---|---|---|
| Where your file is processed | On their servers, after you upload it | On their servers, after you upload it | In Adobe's cloud, after you upload it | In your browser, on your own device |
| Account or sign-in | Asked for early, and needed once you pass the free allowance | Optional for small jobs, needed for bigger ones | Most online tools need an Adobe ID | Never needed |
| Usage limits | A few free tasks, then an upgrade prompt | Daily task and file limits on the free plan | The free web tools are mostly a preview of the paid plan | No task counters and no daily limits |
| File size ceiling | The free plan limits upload size | The free plan limits upload size | Cloud upload limits apply | We don't set one. Your device's memory is the practical limit |
| Works without a connection | No, their server does the work | No, their server does the work | No, the cloud does the work | Yes for the browser tools, once the page has loaded |
| Cost | Paid subscription for full access | Paid subscription for full access | Paid Acrobat subscription for full access | Free. Every tool is open to everyone |
Other services change their plans and limits often, so treat this as a rough picture and not a price list. Check their websites for the current details.
Frequently asked questions
- Does a watermark stop copying?
- No. It shows the status or owner of a document, but it doesn't control who can copy it.
- Can the watermark go on every page?
- Yes. It's added to every page of the document.
- Can a watermark be removed?
- It becomes part of the page, so removing it cleanly is hard, but not impossible for someone who really wants to. Think of it as a deterrent.
- Will the watermark print?
- Yes, it's part of the page. If you're using a very light setting, print a test page, because black-and-white printers can wash it out.
- Should I watermark before or after merging?
- After, if you want the same mark across the whole bundle.