Uwarp

Upload a PDF to change its color

Paper color tints the white areas. Invert flips every color. Grayscale removes the color.

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Change the color of a PDF

Change a PDF paper color, invert the page, or make it grayscale, then download a new PDF. Free, no sign-in.

What this PDF color changer does

Upload a PDF and change how the page looks. Paper color tints the white areas to a color you pick and keeps dark type readable on a light color. Invert flips every color, which turns a white page dark. Grayscale removes the color. The download is a new PDF made from a picture of each page, up to 20 pages. Typing new text onto a page is on Edit PDF Text. A single photo can be inverted on Color Inverter.

Ways to change the color

Three treatments for the pages you upload.

  1. Paper color: Near-white and gray areas take the color you pick. Saturated marks, such as a blue rule, stay as they are.

  2. Invert: Every color flips. A white page with dark type becomes a dark page with light type.

  3. Grayscale: Color is removed and the page is saved in shades of gray.

  4. A new PDF: Each page is drawn, recolored, and written into a PDF you can download.

How to change colors in a PDF

Open the file, pick a treatment, then download.

  1. Upload a PDF

    Use your own unlocked file, or the sample page.

  2. Choose paper, invert, or grayscale

    Paper color uses the color field. Invert and grayscale ignore it.

  3. Check page 1

    The preview shows the first page with the treatment applied.

  4. Download the PDF

    The file includes up to 20 pages at the original page size.

Tips

How the color lands on a typical document.
  • 01

    Use a light paper color for dark type

    Dark type stays dark. A light paper color keeps that type readable.

  • 02

    Invert for a dark page

    Invert is the treatment that turns the whole page dark, including the type.

  • 03

    Unlock a password file first

    An encrypted PDF has to be opened on Unlock PDF before this page can read it.

When to use this page

Jobs this changer is built for.

  • A tinted document

    Give a white PDF a paper color before you print or share it.

  • A dark reading copy

    Invert a light document so the page is dark.

  • A gray copy

    Strip the color from a page that should print in black and white.

What you get

A recolored PDF from the file you already have.

  1. Preview before download: Page 1 updates when you change the treatment or the paper color.

  2. No account: The page runs in the browser. There is no sign-in step.

  3. Local processing: The PDF is drawn on a canvas in your browser.

Technical details

How the new PDF is produced.
Input
An unlocked PDF up to 20 MB.
Pages
The first 20 pages. Later pages are left out of the download.
Output
A PDF of JPEG page images at the original page size.
Where it runs
Canvas pixel edits in your browser.

Sources & References

Where the pixel read and the canvas drawing method come from.
  • “The CanvasRenderingContext2D method getImageData() of the Canvas 2D API returns an ImageData object representing the underlying pixel data for a specified portion of the canvas.”
    — MDN Web Docs — CanvasRenderingContext2D.getImageData()

    CanvasRenderingContext2D.getImageData(): Each page is drawn on a canvas, then the pixel buffer is recolored before it is saved. developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/getImageData

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML <canvas> element.”
    — MDN Web Docs — Canvas API

    Canvas API: The PDF page is painted onto a canvas in the browser, then written back out as a JPEG page. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

Frequently Asked Questions

Quick answers about this tool—open a question to read more.