Change PDF Background Color with Sepia or a Dark Theme

Changing a PDF background gets you a copy of the document on a colored page instead of bright white. PDF-File.com's Change PDF Background tool redraws every page on one of 7 theme colors and leaves your original file alone.

Pick Sepia for dark text on a warm cream page, or one of the six dark themes for light text on a dark page. The new PDF is made of page images, so open it and look it over before you share it.

How does the Change PDF Background tool work?

Our server renders each page with Ghostscript as a 24-bit PNG image at 300 dpi. It keeps the dark marks on the page, like text and line art, as a mask and paints that mask in the theme's text color onto its background color. Then the pages go into a new PDF at their original size.

Colors, photos and light gray shading don't carry over, because only the dark marks survive the mask. Selectable text, links, form fields and annotations are gone too, since every page becomes a picture.

Which PDF background colors can you choose?

You get 7 preset themes: Dark, AMOLED (pure black), Sepia (cream), Midnight (navy), Dracula (dark gray), Forest (green) and Cool (slate gray). Each theme button shows its background swatch before you convert. There's no custom color picker, and you can't use an image as the background.

Sepia: dark text on a cream page

Sepia turns the text dark brown and the page a warm cream. Pick it when pure white feels too bright but you still want solid, easy-to-read letters.

The six dark themes

Dark, AMOLED, Midnight, Dracula, Forest and Cool give the page a dark background. Each paints the text in a light color of its own (pale gray on Dark, purple on Dracula, green on Forest and Cool) as solid letters with at least 4.5:1 contrast to the page. If you'd rather have the original colors inverted, PDF Dark Mode does that in your browser.

How do you turn a white-on-black PDF into black on white?

Use PDF Dark Mode for that, not this tool. On our test page of white text on a black A4 page, it gave black letters on a pure white page, because its color inversion works in both directions.

Change PDF Background treats the whole black page as one big dark mark. With Sepia, the page came out solid brown with cream letters, still 98.6% dark, and with Dark it came out light gray with near-black letters. That light gray copy prints, but it still puts gray on every bit of the sheet.

Why change the background color of a PDF?

Bright white pages can feel harsh in a dim room or over a long evening of reading. Some readers find a light-on-dark color scheme easier on the eyes and others argue the opposite, so the right theme is partly down to taste.

The theme is saved in the file itself, so the page looks the same in any PDF reader on any device. You won't have to change viewer settings on every computer, tablet or phone.

How to change a PDF background online

1. Click the upload area and pick one PDF of up to 25 MB.
2. Pick a theme under Select Theme. Dark is selected by default.
3. Click Change Background and wait while the server redraws the pages.
4. Click Download to save the restyled PDF, then open it and check every page.

It takes one file per run. If the PDF won't open or the conversion fails, run it through Repair PDF, one of our PDF optimization tools, and upload the repaired copy here.

What happened when we tested Change PDF Background

We ran our small test file test1.pdf (4.9 KB, 1 page, a black top hat drawing) through the default Dark theme. The result, test1_dark.pdf, was 48.5 KB and 1 page, and it was ready 0.9 seconds after we clicked Change Background. Tested in October 2026.

The file grew almost ten times larger because its page is now a 300 dpi image. On the dark page the hat showed as a solid light gray shape, which is how the dark themes paint dark marks.

How much bigger does the themed PDF get?

A page of plain text grows the most, while a PDF made of screenshots can actually shrink, because every page becomes a 300 dpi image either way. Here are our runs from October 2026:

The 12 pages took 6.8 seconds per theme. In every copy the text could no longer be found or copied, and a page with one web link had none left afterwards.

What to check before you share a themed PDF

Keep the original file. The themed copy has no selectable text, so search, copy and paste, and screen readers won't work on it (OCR PDF can pull the text back out of image-based pages, though).

Text-only pages grow a lot, as the table shows. Compress PDF can bring the size down before you email the copy, and if all you want is a printer-friendly version, Grayscale PDF is the better pick.

Want a logo or cover image on the themed copy afterwards? Use Add Image to PDF.

Frequently Asked Questions about Changing a PDF Background

Does the tool change my original PDF?

No. It makes a separate PDF and leaves the file you picked unchanged.

Which background colors are available?

Dark, AMOLED, Sepia, Midnight, Dracula, Forest and Cool. You can't enter a custom color or use an image as the background.

Which theme is easiest to read?

That depends on the light around you. Sepia keeps dark text on a cream page, while Dark and AMOLED give the brightest letters on a dark page, so convert a short file first and compare.

Will the output keep selectable text?

No. Every page becomes a 300 dpi image, so text, links and form fields can't be selected or edited any more.

How large can the PDF be?

Up to 25 MB, one file per conversion. We delete the upload from our server automatically within two hours.

Can I use the converted PDF on another device?

Yes. The theme is part of the downloaded file, so it opens the same way in other PDF readers.