Each page is rasterized with PDF.js using ITU-R BT.601 luminance (or 1-bit threshold), then rebuilt with pdf-lib. Text search and fillable forms are not preserved—keep your original color PDF. Files are not uploaded.

Skip to grayscale PDF converter

Convert PDF to Black & White — Grayscale Online (No Upload)

Convert a color PDF to black & white (grayscale) in your browser

  • Formula: L = 0.299×R + 0.587×G + 0.114×B — pure red ≈ 76 gray; green ≈ 150; blue ≈ 29.
  • Modes: Standard grayscale (256 levels), High contrast (print), Soft grayscale, or true 1-bit black & white for line art.
  • Ink & size: Photo-heavy PDFs often shrink ~20–60% after color removal; text-only files may grow because pages become images—check the size comparison after convert.
  • Privacy: PDF.js + pdf-lib run locally—files are never uploaded. Output is image-based (no text search or fillable forms)—keep your color original.

Need searchable DeviceGray without rasterizing? Use Adobe Preflight or Ghostscript locally. For email size limits after conversion, use Compress PDF; for selected pages only, Split PDF or set a page range below.

PDF.js + pdf-lib in your browser · never uploaded · keep your original
Grayscale removes color for black & white printing—words, layout, and images stay in place; only ink colors change.

Loading PDF engine…

Turn color pages into black & white for printing—content stays the same, only colors change.

PDF only · Max 50 MB

Processed in your browser—nothing is uploaded

By Muhammad Abdullah Rauf · Founder, EverydayTools.proUpdated 2026-07-10

What is a PDF to grayscale converter?

Grayscale conversion removes color information so you can preview how a document will look on a black-and-white printer, meet submission rules that require greyscale figures, or share a print-friendly copy.

This tool renders each PDF page with PDF.js, applies ITU-R BT.601 luminance weighting, and rebuilds a new PDF with pdf-lib. The result is image-based: visual appearance is preserved, but text search and interactive form fields are not.

Always keep your original color PDF for editing, search, and archival workflows.

Upload → pick print quality → Convert to grayscale → Download. Output is for printing; keep the original for search and forms.

How to use Convert PDF to Black & White

  1. Upload your PDF

    Drag and drop a PDF or click to browse. We analyze page count, color content, and estimated processing time automatically.

  2. Review the preview

    Compare original and grayscale side by side. Flip through pages and pick Standard, High contrast, Soft grayscale, or true 1-bit black & white. Optionally set a page range and DPI.

  3. Convert to black & white

    Click Convert to grayscale (or press Ctrl+Enter). Progress shows each stage and page number as pages are processed.

  4. Download the new PDF

    Review the before/after summary, download the grayscale PDF, change settings and reconvert, or start with another file.

Who uses Convert PDF to Black & White?

Common real-world scenarios where this tool saves time.

Office workers and administrators

Preview how a document will print on a monochrome printer

Convert to greyscale before printing to verify that colour-only formatting (coloured text, charts with colour-only differentiation) is still readable when printed in black and white.

Publishers and academics

Meet greyscale-only submission requirements

Some academic journals, patent offices, and government agencies require greyscale figures and images in submitted documents. Converting to greyscale PDF satisfies these requirements.

Archivists and records managers

Create a print-friendly copy without altering the original

Keep the color master for search and compliance; distribute a grayscale derivative for monochrome printing and internal review.

Workflow guides

Step-by-step chains that connect related tools for common tasks.

Convert to grayscale → compress for monochrome print or archival

Grayscale conversion reduces image channels from 3 (RGB) to 1, which can help subsequent compression on photo-heavy files.

  1. Convert the PDF to grayscale here — color images become single-channel greyscale pages.
  2. Review charts and colored highlights to ensure labels remain distinguishable without color cues.
  3. Compress the grayscale output if you need a smaller attachment for email or portal uploads. Compress PDF
  4. Keep the original color PDF for archives, searchability, or future edits.

Split selective pages → grayscale only needed sections → merge

Use this when only part of a packet must be black-and-white.

  1. Split out the pages that must print in monochrome (for example, forms or appendices). Split PDF
  2. Convert only that segment to grayscale to avoid degrading full-color sections.
  3. Merge grayscale and color sections back into one final packet in order. Merge PDF

Convert PDF to Black & White examples

Convert a colour report for monochrome printing

Input

quarterly-report.pdf (32 pages, colour charts and graphs)

Output

quarterly-report-grayscale.pdf (32 pages, greyscale charts)

Previewing a colour PDF in greyscale before black-and-white printing reveals which charts will print as indistinguishable grey areas. Add labels or patterns if series rely on color alone.

Scan-heavy insurance packet

Input

claim-photos.pdf (18 pages, phone scans + color stamps)

Output

claim-photos-grayscale.pdf (18 pages, print-safe greyscale)

High contrast mode keeps stamp edges and handwritten notes visible when printed on an office monochrome laser printer.

Marketing brochure print proof

Input

brochure-v3.pdf (12 pages, brand gradients and photos)

Output

brochure-v3-grayscale.pdf (12 pages)

Preview how gradients band in greyscale before sending to a print shop—adjust source artwork if mid-tones collapse.

Academic figure submission

Input

thesis-ch4-figures.pdf (6 pages, color-only line charts)

Output

thesis-ch4-figures-grayscale.pdf (6 pages)

Journal requires greyscale figures. After conversion, verify each series is labeled—not distinguished by color alone.

Government form print copy

Input

tax-worksheet.pdf (4 pages, color section headers)

Output

tax-worksheet-grayscale.pdf (4 pages, non-interactive)

Use grayscale output only as a print reference—fillable fields do not work after rasterization. Keep the original for data entry.

Photo-heavy travel itinerary

Input

itinerary.pdf (24 pages, embedded color photos)

Output

itinerary-grayscale.pdf (24 pages)

Photo regions shrink channel data in greyscale; run Compress PDF afterward if email size limits still apply.

How browser PDF grayscale conversion works

Processing runs entirely on your device. (1) PDF.js loads the file from memory and renders selected pages to a canvas at your chosen DPI scale. (2) Pixel data is converted with the ITU-R BT.601 luminance formula: Gray = 0.299×R + 0.587×G + 0.114×B—or thresholded to pure black/white in 1-bit mode. (3) Quality presets adjust tone: High contrast stretches mid-tones for print; Soft grayscale lifts shadows for gentler output. (4) Each page is encoded as PNG and embedded into a new PDF built with pdf-lib. Document metadata (title, author, subject, keywords) is copied when the source file allows. When you need searchable vector text in DeviceGray (not raster images), use Adobe Acrobat Preflight “Convert to Greyscale” or Ghostscript locally, for example: gs -sDEVICE=pdfwrite -sColorConversionStrategy=Gray -dProcessColorModel=/DeviceGray -o out.pdf in.pdf

Formula

L = 0.299×R + 0.587×G + 0.114×B

Limitations

  • Maximum 50 MB per file for browser stability.
  • Output is image-based—Ctrl+F text search and fillable AcroForm fields are not preserved.
  • Rasterizing vector PDFs can increase file size compared with compact text originals.
  • Password-protected PDFs must be unlocked before conversion.
  • Very large page counts (50+) may be slow or memory-intensive on low-RAM devices.
  • This tool is for print preview—not PDF/A archival or professional prepress DeviceGray workflows (use Acrobat/Ghostscript for those).

Sources

Reference tables

Which PDF tool should you use?

Pick the task—not every PDF job needs grayscale.

GoalUse this toolUse instead
Black & white print previewPDF to Grayscale—
Smaller file, keep color—Compress PDF
PNG/JPG per page—PDF to Image
Lock form values (searchable)—Flatten PDF (Keep forms mode)
Bake in comments/highlights—Flatten PDF (Lock everything mode)
Extract pages before converting—Split PDF or Extract PDF Pages

When to use Convert PDF to Black & White vs related tools

Use this page to turn a color PDF into grayscale for printing. For other PDF tasks, pick the tool that matches your goal.

Related toolUse this tool whenUse related tool when
Compress PDFYou need a black & white copy for printing or archiving and want to preview grayscale output first.The PDF is already grayscale or you only need a smaller file size without changing color mode.
PDF to ImageYou want a downloadable grayscale PDF document, not individual page images.You need PNG or JPG pages for slides, social posts, or design tools—not a single PDF file.
Flatten PDFYou need a greyscale print copy of page content.You need to lock form values or bake annotations—not change color mode.

Best practices

Keep the original color PDF

Save the grayscale copy with a new filename (for example, report-grayscale.pdf) and archive the color source for search, forms, and future edits.

Use High contrast for printing

Charts, small text, and scanned pages print more legibly with the High contrast preset—it widens tonal separation before rasterization.

Check charts before you print

Red and green data series often look identical in grayscale. Verify labels and patterns—not just colors—carry the meaning.

Compress after conversion if the file grew

Text-heavy PDFs may grow when rasterized. Run the grayscale output through Compress PDF if you need a smaller attachment.

Common mistakes to avoid

Expecting smaller files every time

Rasterizing pages can increase size for text-only PDFs. Check the size comparison after conversion; use Compress PDF if needed.

Relying on color-only charts

Red and green series often look identical in grayscale. Add labels or patterns in the source file before converting.

Uploading password-protected PDFs

Unlock the PDF in your viewer, save an unencrypted copy, then convert here.

Troubleshooting

Conversion fails immediately

Fix: Refresh the page to reload the PDF engine. Try a smaller file, disable strict browser extensions, or unlock encrypted PDFs first.

Output looks blurry

Fix: Choose Print (~220 DPI) render quality for sharper text; High contrast mode also helps. Very large page sizes take longer on low-RAM devices.

Cannot search text in the output PDF

Fix: This tool rasterizes pages to images. Keep your original for search; use the grayscale file for printing only.

When this tool isn't the right choice

Fillable government or HR forms

Form fields become static images—checkboxes and text inputs will not work. Keep the interactive original.

Searchable document archives

Rasterized pages disable text search. Use the color original for archives; grayscale only for print copies.

Color-required brand or legal submissions

If guidelines require full-color figures or brand palettes, grayscale conversion removes required color information.

Prepress or PDF/A archival compliance

This tool optimizes for print preview, not professional prepress color management or long-term PDF/A workflows.

What to do next

Continue the workflow with the right follow-up tool.

  • File too large to upload? Reduce size first withCompress PDF , then convert to grayscale.
  • Only some pages need grayscale? Isolate them withSplit PDF , convert the segment, then merge back.
  • Combine grayscale and color sections usingMerge PDF in the correct order.
  • Need PNG or JPG pages instead of a PDF? TryPDF to Image for slides and design tools.

Frequently Asked Questions

Does converting to greyscale reduce file size?

Usually yes for photo-heavy PDFs—colour images use RGB (3 channels); greyscale uses one channel. Text-only PDFs may grow after rasterization because pages become images. Check the size comparison after conversion.

Is grayscale PDF the same as black-and-white?

Technically no. Greyscale includes 256 levels from black to white. True bilevel (1-bit) is only black or white—used for line art and OCR. This tool offers both: Standard/Soft/High contrast grayscale modes, plus a True black & white (1-bit) mode with an adjustable threshold.

What happens to coloured text when converting to greyscale?

Coloured text uses luminance weighting: approximately 0.299×R + 0.587×G + 0.114×B. Red text that relies only on colour for emphasis may become hard to read in greyscale—verify the output before printing.

Will PDF forms and fillable fields still work after conversion?

No. Each page is rendered to a grayscale image and rebuilt as a new PDF. Checkboxes, text fields, and digital signatures are not preserved—only the visual appearance. Keep your original for filling forms; use the grayscale copy for printing.

Why would I convert a PDF to greyscale before printing?

Black-and-white printers cannot reproduce colour and auto-convert during printing, often with poor results—especially for fine gradients and colour-only chart differentiation. Pre-converting lets you verify legibility and reduces surprises at the printer.

Will I still be able to search text in the grayscale PDF?

No. This tool rasterizes each page to an image for reliable grayscale conversion, so Ctrl+F search and text selection do not work in the output. Keep your original color PDF for search.

Can I convert only some pages to grayscale?

Yes. Enter a page range such as 1,3-5 or 2-10 before converting—only those pages are included in the download. Alternatively, use Split PDF to isolate pages, convert the segment, then Merge PDF back with color sections.

How do I keep searchable text when converting to grayscale?

This browser tool rasterizes pages to images, so text search is lost. For searchable DeviceGray output, use Adobe Acrobat Preflight “Convert to Greyscale” or Ghostscript with -sColorConversionStrategy=Gray on your computer, then keep that file for archives.

What is the difference between grayscale PDF and compress PDF?

Grayscale changes color content to black and white (may reduce size for image-heavy PDFs). Compress reduces file size without necessarily removing color. Use grayscale before monochrome printing; use compress for email size limits.

Should I run OCR before or after converting to grayscale?

If your source is a scan, OCR first on the original color file if possible. OCR engines usually perform better before additional processing. After grayscale conversion, run OCR only if you need selectable text in a rasterized output.

Privacy, accuracy, and trust

Privacy

Your PDF is processed in your browser—it is not uploaded to EverydayTools servers.

How this tool works

PDF.js renders each page locally; the grayscale PDF is assembled with pdf-lib in memory on your device.

Verification guidance

Upload a one-page color PDF, convert with High contrast, download, and confirm text and charts print legibly in black and white.

Limitations: Output is image-based: no text search, no interactive forms. Archive the original color PDF separately. For searchable DeviceGray, use Acrobat or Ghostscript.

For printing and preview—not a substitute for professional prepress or PDF/A archival workflows.

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Reviewed on 2026-07-10.

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