Will text still be selectable after conversion?

No. Grayscale is applied by re-rendering each page as an image, so the text becomes pixels. If you need a searchable grayscale PDF, run the result through the Searchable PDF (OCR) tool to add an invisible text layer.

Does grayscale make the file smaller?

Not reliably, and often the opposite. Scanned color documents may shrink, but a text-heavy PDF will usually grow, because compact vector text gets replaced by full-page JPEG images. Convert to grayscale for how it looks, not to save space — for size, use Compress PDF.

How accurate are the gray tones?

The conversion uses the standard luminance formula (about 30% red, 59% green, 11% blue), which matches perceived brightness. Two colors that look equally bright will map to similar grays — worth checking on charts that rely on color alone to distinguish series.

Is there any quality loss?

Pages are rendered at twice their nominal resolution and saved as high-quality JPEGs, so printed output looks crisp. Under heavy screen zoom you may notice it's an image rather than vector text.

Grayscale PDF

Convert your color PDF to black and white.

Drop PDF files here or browse

Max 100MB per file

About Convert PDF to Grayscale

Grayscale conversion strips the color out of a PDF, leaving black, white, and shades of gray. The classic reasons to do it: you're printing on a monochrome printer and want to see exactly how the document will come out, a print shop has asked for grayscale artwork, or you want color-coded content to photocopy legibly.

Convertora converts in your browser by rendering each page at double resolution onto a canvas, recalculating every pixel with a standard luminance formula (the same weighting your eye uses — green counts more than red, red more than blue), and reassembling the pages into a new PDF. Colors don't just lose saturation; they map to the gray tones a monochrome printer would actually produce.

Be aware of the trade-off: because pages are re-rendered as images, the output is a rasterized PDF. It looks right and prints right, but the text is no longer selectable or searchable. If you need the text layer back, run the result through the Searchable PDF tool, which adds one via OCR.

How to use it

1Upload your PDF (up to 100 MB).
2Click Convert. Each page is rendered at 2x scale, converted pixel-by-pixel to grayscale, and re-embedded as a JPEG at its original page size.
3Watch the progress bar — page-by-page rendering takes longer than metadata-style edits, especially for long documents.
4Download the grayscale version, saved with a -grayscale suffix. The original color file on your computer is untouched.

Common use cases

Previewing exactly how a color report will look from a black-and-white office printer.
Meeting a print shop's requirement for grayscale-only artwork.
Checking that color-coded charts remain distinguishable without color — before someone photocopies them.
Producing a uniform monochrome version of a document assembled from mixed color sources.

Frequently asked questions

Tips

Check your charts after converting: red and green of similar brightness become nearly identical grays. If a chart turns ambiguous, restyle it with patterns or labels before distributing.
Only need one page in grayscale? Split it out first, convert it, and merge it back — you'll keep selectable text on the other pages.

100% private — runs in your browser

Convertora processes everything on your device using JavaScript and WebAssembly. Files never leave your browser, are never uploaded to a server, and are never seen by us or anyone else. The moment you close the tab, the data is gone — there is no temporary cloud copy, no log entry, no retained backup.

Because the work happens locally, processing speed depends on your device — but there are no rate limits, no daily caps, and no file size restrictions beyond what your browser can handle in memory. No signup, no account, no payment. The tool works the same in incognito mode, on a corporate network, or after the page has loaded once, even with the network disconnected.