Add a background to a PDF — letterhead, branded color, or watermark image.
Drop a PDF, pick an image / solid color / one-page template, choose behind-content or overlay placement, set scale and opacity, click apply. The output is your PDF with a background on every page — no upload, no signup.
- ✓ Stays in browser
- ✓ No signup
- ✓ Image · color · PDF template
Want to edit more on this PDF?
Sign, redact, watermark, autofill · stays in your browser
Drawn first; existing text and images stay readable on top.
How it works.
- Step 01
Drop the PDF
Drag a PDF onto the dropzone or click to browse. The file stays in your browser.
- Step 02
Pick a source
Image, solid color, or a one-page PDF used as a vector letterhead. Each page in the output gets the same background.
- Step 03
Behind or overlay
"Behind" puts the background under existing text and images. "Overlay" stamps it on top with adjustable opacity — same as a watermark.
- Step 04
Apply & download
Output saves to your device. The original PDF on disk is untouched.
About backgrounds.
Does "behind" placement actually keep my content on top?
Yes. We rebuild each page so the background is the first thing drawn and the original page contents are stamped on top of it. Existing text, images, and signatures stay fully visible.
Will my fillable form fields still work after this?
Use the "Overlay" placement and they will. "Behind" flattens each page (the background plus the original page content become one layer), which removes interactive AcroForm fields. If you need both — a backdrop AND fillable fields — fill the form first, then add a behind background.
Can I use a vector letterhead instead of an image?
Yes — drop a one-page PDF as the source. Vectors stay sharp at every zoom, and the file size stays small. Most letterheads exported from Word, Pages, or Illustrator already work.
Will the background reach all the way to the edge?
On "Stretch" yes — the background is forced to fill the page exactly. On "Fit" you keep the source's aspect ratio and the page may show gutters; "Fill" crops the source to cover the page edge to edge.
Why does the file get bigger when I add a background?
Each page now carries the background image (or color, or vector). For a 50-page PDF the same image gets referenced 50 times — pdf-lib only stores it once via XObject reuse, but your bytes still go up by the size of that image.
Need to do more than this?
Open the full editor for signing, redaction, watermarks, autofill, and the rest of the toolbelt — same file, no upload, no signup.