Convert PDF to Black and White

How to Turn a Colored PDF into Black and White

Converting a color PDF to black and white takes three steps and under a minute, even for multi-page documents.

Step 1 — Upload your PDF. Drag and drop your file into the upload area, or click "Select PDF File" to browse your device. Files up to 100 MB are accepted. Your file is transferred over an encrypted connection, and it is deleted automatically from the server after two hours — nothing is stored, reviewed, or shared beyond that window.

Step 2 — Click "Convert to Grayscale." The converter processes each page of your PDF and applies a weighted luminosity conversion — the same method used in professional print prepress. Text, images, vector graphics, and embedded illustrations are all handled in a single pass. There is no queue, no waiting room, and no page limit.

Step 3 — Download your grayscale PDF. Once processing finishes, your converted file appears in the results panel. Click "Download PDF" to save it. No watermark is added. No account is required. The output is a clean, standard PDF file that works with every PDF reader.

Why Convert a Color PDF to Black and White

People convert PDFs to grayscale for practical reasons — printing budgets, submission requirements, file size, and accessibility. Here is what drives each use case.

Save Ink and Reduce Printing Costs

Color ink cartridges cost three to five times more per page than black cartridges. For an office that prints internal reports, meeting handouts, or reference documents regularly, that difference adds up fast. A fifty-page color report might cost around $2.50 in color ink to print. The same document converted to grayscale first prints for roughly $0.30.

The reason the savings are real is that printing "in grayscale" through your printer driver is not the same as converting the PDF itself — more on that distinction below. When you convert the PDF to grayscale before printing, the printer receives a document with no color data at all, which means it draws only from the black cartridge and produces consistent, predictable results.

Schools, universities, and high-volume print environments see this most clearly. A department printing 500 handout pages per week saves meaningfully over a semester just by converting lecture slides and reference PDFs to grayscale before sending them to the printer.

Reduce File Size by 30–60%

Color images in a PDF store three channels of data per pixel — red, green, and blue. A grayscale image stores one channel: luminance. For a document with a lot of photographs, color illustrations, or scanned color pages, converting to grayscale typically reduces file size by 30 to 60 percent.

The exact reduction depends on the document type. Photo-heavy PDFs and scanned color documents usually see 50–60% size reduction. Text-based documents with minimal graphics see 10–20%. PDFs that consist of purely vector content with spot colors fall somewhere between.

Smaller files matter when you are attaching documents to email, uploading to a CMS with file size limits, or managing a large document archive. A collection of 200 scanned research PDFs that is 4 GB in color might compress to under 2 GB in grayscale — without touching a compression tool.

Meet Academic Journal and Court Submission Requirements

Academic journals, legal courts, and government agencies frequently require grayscale or black-and-white documents, and submitting a color PDF in these contexts causes rejection or processing delays.

IEEE, Elsevier, and many other academic publishers require that figures submitted for print publication are in grayscale — not because they cannot print color, but because grayscale ensures the figure remains readable in monochrome print editions and for readers without color displays. Authors who submit color figures that rely on color to convey meaning are asked to revise before their paper can proceed.

In legal proceedings, court rules in many jurisdictions specify that exhibits filed in hard copy must be in black-and-white. UK Civil Procedure Rules and various US district court local rules include requirements along these lines. Preparing a grayscale version of a document for court filing is standard practice for litigation support teams.

Converting to grayscale before submission is the fastest fix — one upload, one download, and your document meets the requirement.

Improve Readability for People with Color Vision Deficiency

Approximately 1 in 12 men and 1 in 200 women have some form of color vision deficiency. Documents that use color to distinguish information — red text for warnings, green text for approvals, blue and purple for links versus visited links — can become ambiguous or completely unreadable for these readers.

Grayscale conversion does not fix a poorly designed color document, but it does replace relative color differences with relative luminance differences. Text and elements that had adequate luminance contrast in the original will remain readable as dark gray against a lighter background. Elements that relied entirely on hue with no luminance contrast will flatten — which at least makes the problem visible and prompts a redesign rather than letting it remain hidden.

For internal documents, training materials, and compliance paperwork, providing a grayscale version alongside the color original is a practical accessibility step that takes seconds.

Archive and Standardize Large Document Collections

Organizations that maintain document archives — legal firms, hospitals, universities, government departments — often standardize on grayscale to keep storage costs manageable and ensure visual consistency across materials produced at different times by different teams.

A document archive that mixes color scans, color PDFs from design software, and grayscale documents creates inconsistent visual weight and unpredictable file sizes. Converting everything to grayscale during the ingestion process creates a uniform collection that is cheaper to store, easier to search, and faster to transmit.

How PDF to Grayscale Conversion Actually Works

Most tools describe what they do — upload, convert, download. Few explain how the conversion actually works. Understanding the mechanism helps you predict what your output will look like and why some conversions produce better results than others.

The Weighted Luminosity Method — Why Not All Grays Are Equal

When a colored pixel is converted to grayscale, the simplest approach is to average the three color channels: (R + G + B) ÷ 3. This is called the average method, and it produces muddy, flat-looking results because it treats all three color channels as equally important to how bright something looks. They are not.

The human eye is much more sensitive to green light than to red or blue. Green contributes the most to perceived brightness; red contributes moderately; blue contributes the least. A conversion that ignores this produces a result where red objects appear darker than they should and green objects appear lighter — the overall image looks unnatural, and fine text in colors like red or orange becomes harder to read.

The weighted luminosity method corrects for this by applying coefficients that match how human vision works. The modern standard, defined by ITU-R Recommendation BT.709 (the standard for HDTV and most digital displays), uses:

Y = 0.2126R + 0.7152G + 0.0722B

An older formulation from BT.601, still in use for legacy systems and standard-definition video workflows, uses slightly different weights:

Y = 0.299R + 0.587G + 0.114B

Both formulas produce significantly better results than the average method. Green receives the highest weight in both because the eye's peak sensitivity falls in the green-yellow range. Blue receives the lowest weight because it contributes the least to perceived brightness even at full saturation.

The converter on this page uses the luminosity method, which is why colored headings, red warnings, and blue links in your original document all convert to readable dark-gray text rather than light, washed-out smears.

Color Spaces in PDF: DeviceRGB, DeviceCMYK, and DeviceGray

A PDF document does not store color as a single unified format. It stores color as one or more color spaces, and a single document can contain content in several different spaces simultaneously.

DeviceRGB is used by most PDFs created on a screen — documents exported from Word, Google Docs, web browsers, and most design applications. Each pixel or vector element has a red, green, and blue value. This is the most common color space in PDFs you are likely to encounter.

DeviceCMYK is used by PDFs created for print production. Cyan, magenta, yellow, and black values are stored instead of RGB. Documents exported from InDesign, QuarkXPress, or other professional print applications often use CMYK. Some PDFs contain a mix of RGB and CMYK content, which is a common source of color inconsistency in print workflows.

DeviceGray is the grayscale color space. It stores a single luminance value per pixel — no color information at all. When you convert a PDF to grayscale, the goal is to remap all DeviceRGB and DeviceCMYK content to DeviceGray using the luminosity formula described above.

ICC profiles tell the rendering engine exactly how to interpret the color values in a given space. When converting to grayscale, the output is typically tagged with one of two ICC gray profiles.

ICC Color Profiles: Gray Gamma 2.2 vs Gray Gamma 1.8

Gray Gamma 2.2 is the standard ICC grayscale profile for screen-optimized and web-distributed documents. It matches the gamma encoding used by the sRGB color space, which is the default for almost all modern displays, including Windows systems, Android devices, and modern iMacs. A grayscale PDF tagged with Gray Gamma 2.2 will display consistently and correctly on any modern screen.

Gray Gamma 1.8 is a legacy profile that was used by Apple from the early Macintosh era through approximately Mac OS X 10.5. It produces slightly lighter midtones than Gamma 2.2 and was the default output from many early Mac-based prepress workflows. You will still encounter Gray Gamma 1.8 in older archived documents and in some print production specifications that were written before the Mac platform standardized on Gamma 2.2 around 2009.

For most purposes today, Gray Gamma 2.2 is the correct output profile. If you are preparing a document for a print shop that specifically requests Gray Gamma 1.8, that is a job for Ghostscript or Acrobat Preflight (covered below) rather than a general online converter.

Grayscale vs Black and White vs Monochrome: What Is the Difference?

These three terms are often used interchangeably, but they refer to different things — and choosing the wrong one affects the quality of your output.

	Grayscale	Black and white (1-bit)	Monochrome
Shades	256 (0–255 luminance)	2 (black only, white only)	Technically any single-color scale; often used to mean black and white
Bit depth	8-bit per pixel	1-bit per pixel	Context-dependent
File size	Smaller than color; larger than 1-bit	Smallest possible	Varies
Best for	Documents with photos, gradients, shading	Simple line art, engineering drawings, QR codes	Fax output, legacy archiving
PDF photos	Retain detail and shading	Lose all midtone detail; posterized look	Depends on implementation

Grayscale is the right choice for almost every document people convert in practice — reports, presentations, scanned books, legal filings, lecture slides, and journal figures. It retains shading in photographs, preserves visual hierarchy in charts and diagrams, and keeps text readable in all colors.

Pure black and white (1-bit or bilevel) is appropriate for documents that contain only line art, engineering schematics, or text with no photos. It produces the smallest possible file and the crispest-looking line art, but it destroys photographic detail entirely — a photograph converted to 1-bit looks like a photocopy from a broken machine.

Monochrome in common usage often means the same as black and white, but technically it refers to any image that uses only shades of a single color — including a sepia-toned image (shades of brown) or a blue-tinted grayscale. In the context of PDF conversion, monochrome usually means 1-bit bilevel output.

This converter produces grayscale output — 8-bit, 256 shades — which gives you the best quality for documents containing photographs, color illustrations, or any gradated content.

Change PDF Background Color and Invert PDF Colors

Grayscale conversion handles two related use cases that people search for under different terms.

Converting a Dark-Background PDF to a White Background

Some PDFs — particularly those created from presentation slides, dark-themed design applications, or night-mode screen captures — have a dark or black background with light-colored text. When you convert this type of document to grayscale, the dark background becomes a dark gray, and the light text becomes a lighter gray, maintaining the original contrast relationship.

If your goal is to produce a document with a white background and black text suitable for printing, the correct approach is to convert to grayscale first, then review the output. For most dark-background PDFs, the grayscale output will have a dark background. A full background color swap — making the background genuinely white — requires a PDF editor that can access and modify the background fill layer separately. Grayscale conversion removes color information; it does not remap light and dark values.

That said, many "dark background" PDFs are actually light-background documents with large dark image areas or colored fills. For these, grayscale conversion often produces a cleaner, lighter output than the original because the dominant color is not true black.

PDF Color Inversion vs Grayscale: Which Do You Actually Need?

Color inversion and grayscale conversion are two different operations that people often confuse.

Grayscale conversion removes all color information and maps every pixel to a luminance value. The relative brightness relationships in the document are preserved — a bright red area becomes a light-to-medium gray, a dark navy area becomes a dark gray.

Color inversion swaps every hue value to its complement on the color wheel while also reversing brightness (dark becomes light, light becomes dark). A white background with black text inverts to a black background with white text. Red becomes cyan, blue becomes orange, green becomes magenta.

If you want a document where dark areas become light and light areas become dark — for example, converting a dark-background document to a white-background document — you want color inversion, not grayscale. Color inversion is a feature available in Adobe Acrobat Pro and most desktop PDF editors. It is not a standard feature of online grayscale converters, including this one.

If you want to remove all color while keeping brightness relationships intact — which is what most people actually need — grayscale conversion is the right tool.

Grayscale PDFs for Print Production: Offset Printing and PDF/X Standards

Graphic designers, print production managers, and prepress operators work with grayscale conversion as a standard part of print preparation workflows. This section covers the professional context that casual users rarely encounter but that explains why grayscale conversion matters beyond home printing.

When Print Shops Require Grayscale: PDF/X-1a and PDF/X-4

PDF/X-1a is a PDF standard designed for reliable print exchange. It requires that all content in the file is in either CMYK or spot colors — no RGB content is permitted because RGB values are device-dependent and cannot be reliably reproduced on a printing press without knowing the specific display they were designed for. DeviceGray is explicitly permitted in PDF/X-1a because a single luminance channel is device-independent in the relevant sense.

When a print shop asks you to "flatten to CMYK" or deliver a "press-ready PDF," they are typically asking for PDF/X-1a or PDF/X-4 compliance. If your document contains RGB content (which most screen-created PDFs do), you have two options: convert to CMYK, or convert to grayscale. For documents that do not require color — black-and-white reports, text-only publications, grayscale photographs — converting to DeviceGray is the cleaner and more efficient choice.

PDF/X-4 is the more modern standard, allowing ICC-managed color, transparency, and live effects. It is widely used for high-end commercial print workflows where color accuracy across devices is critical. For grayscale-only documents, PDF/X-4 with a DeviceGray color space is the technically correct choice.

Using Adobe Acrobat Preflight to Convert Color to Grayscale

Adobe Acrobat Pro includes a professional preflight engine under Tools → Print Production → Preflight. Within the Preflight panel, there is a fixup called "Convert colors to grayscale" (or in some versions, "Convert to DeviceGray"). Running this fixup processes the entire document and converts all DeviceRGB and DeviceCMYK content to DeviceGray using the selected ICC output profile.

The workflow is:

1. Open your PDF in Acrobat Pro
2. Go to Tools → Print Production → Preflight
3. Search for "Convert color to grayscale" in the fixups search bar
4. Select the fixup, then click the wrench icon to run it
5. Choose your output profile (Gray Gamma 2.2 for screen; a custom profile if required by your print spec)
6. Save the result

The Acrobat Preflight method gives you the most control and is the industry standard for prepress work. The limitation is that Acrobat Pro costs approximately $20–30 per month. For users who need grayscale conversion without a subscription, this online converter produces the same DeviceGray output using the same luminosity-based color transformation.

How to Convert a PDF to Grayscale Using Ghostscript

Ghostscript is a free, open-source PostScript and PDF interpreter that can perform high-quality grayscale conversion from the command line. It is the underlying engine that many professional PDF tools use internally. If you need batch conversion, scripted workflows, or the highest level of control over the output profile, Ghostscript is the tool professionals reach for.

The command to convert a color PDF to grayscale using Ghostscript is:

gs -sDEVICE=pdfwrite \
   -sColorConversionStrategy=Gray \
   -dProcessColorModel=/DeviceGray \
   -dCompatibilityLevel=1.4 \
   -dNOPAUSE -dBATCH \
   -o output-grayscale.pdf \
   input-color.pdf

Breaking down the key flags:

• -sColorConversionStrategy=Gray tells Ghostscript to convert all color content to grayscale during output
• -dProcessColorModel=/DeviceGray sets the output color model to DeviceGray
• -dCompatibilityLevel=1.4 sets the PDF version of the output (1.4 is widely compatible; use 1.7 for newer features)
• -o output-grayscale.pdf names the output file
• input-color.pdf is your source file

For batch conversion of multiple files, you can loop over a directory in bash:

for f in *.pdf; do
  gs -sDEVICE=pdfwrite -sColorConversionStrategy=Gray \
  -dProcessColorModel=/DeviceGray -dCompatibilityLevel=1.4 \
  -dNOPAUSE -dBATCH -o "gray_$f" "$f"
done

Ghostscript is free and available for Windows, macOS, and Linux. It requires comfort with a terminal. If you do not want to use the command line, this online converter performs the same color space conversion without any installation.

Online Tool vs Adobe Acrobat vs Ghostscript vs Mac Preview

Not all grayscale conversion methods produce the same results, and not all of them are practical for every situation. Here is a direct comparison.

	AllFileTools (this tool)	Adobe Acrobat Pro	Ghostscript	Mac Preview
Cost	Free	~$25/month	Free	Free (Mac only)
Install required	No	Yes	Yes	Pre-installed
Skill required	None	Moderate	Command line	Low
Output quality	High (luminosity method)	Professional	Professional	Variable
Batch conversion	One file at a time	Yes (Action Wizard)	Yes (scripted)	No
ICC profile control	No	Full	Full	Limited
Scanned PDFs	Yes	Yes	Yes	Yes
No watermark	Yes	Yes	Yes	Yes

How to Make a PDF Grayscale on Mac Without Acrobat

macOS includes a built-in method for grayscale conversion through the Quartz Filter system in Preview, but the results are inconsistent and it is not recommended for professional use.

The method works like this:

1. Open your PDF in Preview
2. Go to File → Export as PDF
3. In the export dialog, click the "Quartz Filter" dropdown
4. Select "Gray Tone"
5. Save the file

The problem is that the Gray Tone Quartz Filter in macOS is not a proper color space conversion — it applies a tonal filter that approximates grayscale by desaturating the image. The output often has noticeably larger file sizes than a proper grayscale conversion, and the results on complex color documents can look uneven. For a quick preview of what a document looks like in grayscale, it works. For anything that will be printed or submitted professionally, it is not reliable.

The online converter on this page produces consistent, luminosity-weighted output regardless of your operating system. macOS, Windows, and Linux users all get the same result.

Why Printing in Grayscale from Your Printer Driver Is Not the Same

This is probably the most misunderstood aspect of PDF grayscale printing, and getting it wrong wastes ink and produces inconsistent results.

When you send a color PDF to your printer and select "print in grayscale" in the printer driver settings, the following happens: the printer receives the full color PDF file, the printer driver applies a grayscale rendering at the last possible moment — in the print rasterizer — and then the printer produces the output. The problem is that most printer drivers do this poorly. The grayscale rendering in consumer and even many professional printer drivers uses a simple averaging method rather than the luminosity method, which produces muddy results. More importantly, many color printers still draw from color ink cartridges even when printing "in grayscale" — the driver uses color inks to create the appearance of gray, which uses up your color ink just as quickly as a color print would.

Converting the PDF itself to grayscale before printing is categorically different. The file sent to the printer contains no color data at all. The printer draws only from the black cartridge. The output is consistent with what you see in the grayscale preview. You save color ink and get a predictable result.

Converting Specific Types of PDFs to Grayscale

Not all PDFs are the same, and grayscale conversion behaves slightly differently depending on how the original document was created.

Scanned PDFs

A scanned PDF is, at its core, a collection of images — one image per page. The PDF format wraps those images with a container structure and page dimensions, but the content is raster images rather than editable text or vector graphics.

Converting a scanned PDF to grayscale re-processes each page image using the luminosity conversion, then re-encodes it as a grayscale image inside the PDF container. The output is structurally identical to the input — images in a PDF wrapper — but in grayscale rather than color. Text sharpness is preserved because no text layer exists to degrade; the image is simply recolored.

One practical note: if your workflow involves scanning a document in color and then running OCR (optical character recognition) to make it searchable, the correct sequence is usually to scan in color or grayscale first, run OCR on the color or grayscale scan, and then convert to grayscale afterward. Running OCR on a grayscale file works fine, but some OCR engines perform better on full-color input when distinguishing between ink colors and background noise.

PDFs with Mixed Color and Grayscale Pages

Some documents are partially color and partially grayscale — for example, a report where charts and cover pages are in color but body text pages are already in black and white. Converting the whole document to grayscale is the cleanest approach: the already-grayscale pages are not degraded (DeviceGray to DeviceGray is a no-op), and the color pages are brought into line with the rest of the document.

If you need to convert only specific pages — for example, the color chart on page 7 while leaving everything else unchanged — that requires a PDF editor. Most online converters, including this one, process the entire document.

TIFF and Image-Based Documents

TIFF files (.tif, .tiff) are a common format for scanned documents, especially in archiving and document management workflows. TIFF supports both color and grayscale, and TIFF monochrome (1-bit bilevel) is the standard format for fax and legacy document scanning. This converter accepts PDF files only. If your source document is a TIFF that you need to convert to grayscale, the fastest workflow is to convert the TIFF to PDF first using any image-to-PDF converter, then run the grayscale conversion.

Frequently Asked Questions

Does converting a PDF to grayscale reduce file size?

Usually, yes — especially for PDFs with lots of images. Color images store three channels of data per pixel (red, green, blue). Grayscale images store one (luminance). For a document that is mostly photographs or color illustrations, size reduction of 30 to 60 percent is common. A text-heavy document with minimal graphics will see less change — typically 10 to 20 percent — because most of the file size in text-based PDFs comes from font embedding, structural metadata, and vector path data rather than pixel color channels.

How do I convert a PDF to grayscale online for free?

Upload your PDF using the tool at the top of this page, click "Convert to Grayscale," and download the result. No account is required, there is no fee, and there is no watermark on the output. The conversion uses the weighted luminosity method and produces a standard PDF that works with every PDF reader.

What is the difference between grayscale and black and white in a PDF?

Grayscale uses 256 levels of luminance from black to white — every shade of gray is available. Black and white (also called 1-bit or bilevel) uses only two values: pure black and pure white, with nothing in between. Grayscale is correct for documents with photographs, color illustrations, or any shaded content. Pure black and white is used for simple line art and engineering drawings where file size matters more than image fidelity. This converter outputs grayscale.

Can I convert a scanned PDF to grayscale?

Yes. Scanned PDFs are processed page by page as raster images, and the luminosity conversion is applied to each image. The output is a grayscale version of the same document with all color removed. Scan quality, resolution, and text sharpness are preserved.

Why does my PDF look darker after grayscale conversion?

This happens when your original document contains content with high luminance in a specific color channel — particularly red and blue elements, which have lower weights in the luminosity formula. A bright red area has high saturation but relatively low luminance (red contributes only 0.2126 of the final value in BT.709). After conversion, it becomes a medium-to-dark gray rather than a light gray. If your output looks darker than expected, the original document probably relied on high-saturation color to create a sense of brightness — brightness that the human eye perceives as color, not light. The grayscale output accurately reflects the actual luminance content of the document.

How do I make a PDF black and white on a Mac without Acrobat?

The built-in method is Preview → File → Export as PDF → Quartz Filter → Gray Tone. This works but produces inconsistent results and sometimes larger file sizes. For a cleaner, more reliable output, use this online converter in any browser on macOS — it produces better grayscale output than the Mac Preview Quartz Filter method.

What is the luminosity method for grayscale conversion?

The luminosity method converts color to grayscale by weighing the red, green, and blue channels according to how the human eye perceives brightness. The modern formula (ITU-R BT.709) is: Y = 0.2126R + 0.7152G + 0.0722B. Green contributes the most because the eye is most sensitive to it. Blue contributes the least. This produces more natural-looking grayscale results than the simpler average method, which treats all channels equally.

What is DeviceGray in a PDF?

DeviceGray is the PDF color space for grayscale content. It stores a single luminance value per pixel or vector element, with no color information. When a PDF is converted to grayscale, all DeviceRGB and DeviceCMYK content is remapped to DeviceGray using the luminosity formula and tagged with a gray ICC profile — typically Gray Gamma 2.2 for screen-optimized output.

Can I convert a PDF to grayscale without installing software?

Yes — this is exactly what this tool does. It runs entirely in your browser, requires no download or installation, and works on any operating system. Upload, convert, download. The only requirement is a modern browser.

Is printing in grayscale from my printer the same as converting the PDF first?

No, and this distinction matters. Printing in grayscale through your printer driver sends the full color PDF to the printer — the driver applies a last-minute grayscale rendering, and many printers still use color ink cartridges to produce the gray output. Converting the PDF to grayscale before printing sends a file with no color data at all. The printer draws only from the black cartridge, uses less ink, and produces a more consistent result.

How do I convert a PDF to grayscale with Ghostscript?

Use this command: gs -sDEVICE=pdfwrite -sColorConversionStrategy=Gray -dProcessColorModel=/DeviceGray -dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH -o output.pdf input.pdf. This applies a proper DeviceGray conversion using the same color space logic as professional prepress tools. See the Ghostscript section above for the full breakdown and a batch conversion script.

What is Gray Gamma 2.2 and why does it matter for PDF conversion?

Gray Gamma 2.2 is the ICC color profile that defines how grayscale luminance values map to screen brightness. It matches the gamma encoding of sRGB — the default color space for virtually all modern displays. A grayscale PDF tagged with Gray Gamma 2.2 displays consistently and correctly on Windows, Mac, Android, and iOS screens. Gray Gamma 1.8 is an older Apple standard with slightly lighter midtones, still used in some legacy print workflows but not recommended for new documents.

Can I invert PDF colors instead of converting to grayscale?

Color inversion and grayscale conversion are different operations. Grayscale removes color while preserving luminance relationships — bright areas stay bright, dark areas stay dark. Color inversion swaps both hue and brightness — white becomes black, red becomes cyan, dark areas become light. If you want to flip a dark-background PDF to a white background, you need color inversion, not grayscale. Color inversion is available in Acrobat Pro and most desktop PDF editors; it is not a feature of standard online grayscale converters.

How do I prepare a grayscale PDF for offset printing?

For professional offset printing, the correct workflow is: (1) convert to grayscale using the luminosity method to produce DeviceGray content, (2) set the output ICC profile to Gray Gamma 2.2 or a press-specific gray profile provided by your print shop, (3) if PDF/X compliance is required, run a preflight check in Acrobat or an equivalent tool to confirm the document meets the specification. For standard print-on-demand and digital printing, a straightforward grayscale PDF without a specific ICC profile is usually sufficient.