What Grayscale PDF does
Grayscale PDF rasterizes each page at the selected DPI, calculates luminance from red, green, and blue channels, and embeds the resulting PNG on a same-size PDF page. The complete visible page becomes one image.
This makes the rendered page grayscale, but it sacrifices native PDF structure. Selectable text, vectors, links, forms, layers, and accessibility information are flattened into page pixels.
How to use Grayscale PDF
- Choose one verified PDF no larger than 25 MB.
- Select a render resolution from 72 to 300 DPI.
- Create the grayscale PDF, then inspect small text, gradients, page dimensions, and output size before downloading.
Important details
Grayscale uses weighted luminance
The conversion weights green more than red and blue to approximate perceived brightness. Different colors with similar luminance can become nearly indistinguishable, so charts should be reviewed carefully.
Every page is rasterized
The output is a PDF containing full-page PNG images. This removes text selection and vector scaling and normally invalidates digital signatures or interactive behavior.
Practical uses
- Prepare a visual grayscale proof before monochrome printing.
- Remove color from a short scan-based PDF where raster output is acceptable.
- Check whether a color chart remains distinguishable without color cues.
Privacy and limitations
Page rendering, pixel conversion, and PDF rebuilding happen locally in your browser. PagesTools does not upload the document.
The source is limited to 25 MB and 100 pages, with 72–300 DPI and canvas bounds. All pages are rasterized, so text, vectors, links, forms, signatures, layers, and accessibility structure are not preserved as native PDF elements.