Is it safe to use for a document with personal details in it?

That is the design goal: the document stays on your device, so a statement, a contract or an ID photo is never transmitted for processing. Nothing here needs an internet connection once the page has loaded, apart from engines that fetch their own model data.

Will it work on a phone?

Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.

Do I need to pay or register?

No. Every tool on this site is free, with no account, no email and nothing to install.

Change PDF Background

Beta

Put any color behind page content.

Implemented by compositing rendered pages over your color (pages become images); true vector background switching isn't possible in-browser.

Drag & drop your PDF here

or click to browse — .pdf · up to 1 files

Background color

Pages are composited over the color as images (150 dpi): text stays readable but becomes non-selectable, and dark colors darken the ink too (multiply blend). For a true vector background there is no reliable browser-only method.

Add a PDF first.

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About Change PDF Background

The job of Change PDF Background is narrow on purpose: put any color behind page content. It takes PDF and produces PDF. What it does today: implemented by compositing rendered pages over your color (pages become images); true vector background switching isn't possible in-browser.

Reach for it when changing what is on the page is a one-off rather than a workflow: one file, one result, no account in front of it.

How to use Change PDF Background in 3 steps

Drop the PDF onto the drop area — a single file, up to 100 MB.
Set the Background color or image and how strongly it shows through.
Press Change background and download the PDF result.

What you get with Change PDF Background

Honest scope: implemented by compositing rendered pages over your color (pages become images); true vector background switching isn't possible in-browser.
Runs in your browser — the file is never uploaded
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

Change PDF Background: questions

Is it safe to use for a document with personal details in it?: That is the design goal: the document stays on your device, so a statement, a contract or an ID photo is never transmitted for processing. Nothing here needs an internet connection once the page has loaded, apart from engines that fetch their own model data.
What can't Change PDF Background do?: Implemented by compositing rendered pages over your color (pages become images); true vector background switching isn't possible in-browser. That limit is stated on the page and in the alert above the tool, not buried in a footnote.
Will it work on a phone?: Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.
Do I need to pay or register?: No. Every tool on this site is free, with no account, no email and nothing to install.