Grayscale PDF

Converting a PDF to grayscale turns every colour into a shade of grey. This is handy for cutting ink costs when printing, giving a document a uniform look, or preparing files for black-and-white reproduction.

ColaPDF re-renders each page in grayscale locally in your browser. Note that the output is image-based, which means the text in the resulting PDF is no longer selectable or searchable — a worthwhile trade-off when the goal is a clean monochrome print.

How it works

1. Upload your PDF
2. Choose render quality — Normal is sufficient for most documents
3. Click Convert to Grayscale
4. Download your black and white PDF

Tips

• Because the result is image-based, keep the original if you still need searchable text.
• Grayscale conversion can noticeably reduce ink use on colour-heavy documents.
• Check the preview to ensure important coloured highlights are still legible in grey.

Frequently asked questions

Will the output PDF be text-searchable?

No. Pages are rendered as images, so text will not be selectable in the output.

Why use grayscale?

Grayscale PDFs are smaller and cheaper to print on printers without colour cartridges.

Are files uploaded?

No. Everything runs in your browser.

Does quality affect file size?

Yes — higher quality means larger output file.