Can I watermark with text or a logo?

Both. Text uses Helvetica Bold, with the size clamped between 18 and 52. A logo can be PNG or JPEG, and its width stays within 45 percent of the page. The mark is applied to all pages. The work stays in the browser for files up to 100 MB, and the download is named with _watermarked before the extension.

How faint can the watermark be?

The opacity slider runs from 5 percent to 100 percent in steps of 5, and it starts at 35 percent, which is 0.35. A draft mark is usually readable at the default. If body text disappears, step the opacity down or move the position. Rotation is limited to 0, 45, or 90 degrees, so a diagonal stamp is the 45 degree choice.

Can I put the mark on only one page?

The stamp is applied to all pages. Choose a nine-box position that works for the whole file, such as a corner that stays clear of page numbers. If a single page needs a different treatment, handle that page as its own PDF, stamp it, and then place it back into the packet with the organizer. The local cap is 100 MB.

Which rotations are available?

Only 0, 45, and 90 degrees. Zero keeps a label upright, 45 is the usual diagonal across a draft, and 90 turns the mark onto its side. Combine that with the nine-box grid and the opacity slider. Text stays in Helvetica Bold between 18 and 52. Proof stem_watermarked.pdf on a page that has small type.

Does the PDF upload to a server?

The watermark is drawn in the browser on the local path, for files up to 100 MB. You set the text or the image, the opacity, the rotation, and the position, and every page receives the mark. Download the _watermarked file and read it before you send the draft. Keep the unmarked original if you still need a clean copy.

Why is my logo smaller than the file I uploaded?

The image max width is 45 percent of the page, so a wide PNG or JPEG is scaled down to that share. Crop the logo to the mark itself before you add it, then pick a nine-box cell. Opacity still applies, starting at 35 percent unless you move the slider. The result is on every page of stem_watermarked.pdf.

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Watermark PDF: stamp your mark on every page

Add text or a logo to every page of a PDF in the browser. Set the opacity, the corner, and a tilt of 0, 45, or 90 degrees.

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You want a word or a logo on every page before a draft goes out. Add the PDF, set the mark, and download a file named with _watermarked. The work stays in the browser for files up to 100 MB. Text uses Helvetica Bold, and the size is clamped between 18 and 52. An image can be a PNG or a JPEG, with a max width of 45 percent of the page. The opacity slider runs from 5 percent to 100 percent in steps of 5, and it starts at 35 percent (0.35). Rotation is only 0, 45, or 90 degrees. A nine-box grid picks the position. The mark is applied to all pages. Open the download and read a page of body text under the mark. If the words of the document disappear, lower the opacity or move the grid cell. The original PDF stays yours. The stamped copy is stem_watermarked.pdf.

One mark, every page, placed in the browser

Text or a small image is drawn on all pages with the opacity, rotation, and position you set. The PDF never has to leave the browser for this stamp.

Helvetica Bold, or a PNG or JPEG

Text is set in Helvetica Bold. The size is clamped between 18 and 52, so a short word stays legible and a long phrase stays on the page. An image mark accepts PNG or JPEG and is limited to 45 percent of the page width. Use a logo that is already cropped tight, because the box is a share of the page, not a design canvas.

Opacity, three angles, nine positions

The opacity slider runs from 5 percent to 100 percent in steps of 5, and the default is 35 percent. Rotation is only 0, 45, or 90 degrees, which covers a flat label, a diagonal draft mark, and a side stamp. The nine-box grid places the mark in a corner, on an edge, or in the center. Those choices apply together.

All pages, then a file you proof

The mark is applied to every page, not to a single page you pick. That is what you want for a draft circulating outside the team. The work is local, up to 100 MB, and the download is stem_watermarked.pdf. Read a dense page after export. If the stamp covers a signature line, change the grid cell and run it again.

How it works

1
Add the PDF
The file stays in the browser, up to 100 MB. You are stamping a copy. Keep the unmarked original if you might send a clean version later.
2
Set text or image, then the look
Type the words in Helvetica Bold, or add a PNG or JPEG up to 45 percent of the page width. Choose opacity from 5 to 100 percent, rotation of 0, 45, or 90, and a nine-box position.
3
Download the watermarked PDF
The mark is drawn on all pages. The file is named with _watermarked. Open a text-heavy page and a signature page before you send the draft.

Use cases

A draft that should say DRAFT on every page

Use a diagonal 45 degree word at the default opacity so the pages are marked and still readable.

A logo in the corner of a leave-behind

Place a PNG on the nine-box grid. The width stays within 45 percent of the page.

A confidential label on a packet

Helvetica Bold on all pages, positioned where it misses the page numbers, then proof the download.

Problems we solve

The mark hides the paragraph

Lower the opacity in steps of 5, or move the nine-box position off the text. The default of 35 percent is a starting point.

The logo looks huge

Image width is capped at 45 percent of the page, and a wide file scales to that. Crop the logo tighter and place it again.

Related guide

Specialized Watermark PDF guides

Trust & privacy

In the browser, up to 100 MB

Text and image stamps are drawn locally. The download is stem_watermarked.pdf.

The same mark on every page

Opacity, rotation, and position apply across the file. Proof one dense page before you circulate it.