When the Print Shop Says "Send Us Print Ready PDF"
You've designed something, a report, a brochure, an annual filing, a flyer, and someone needs to print it on paper. Real paper, by a print shop, not a desktop printer. You ask the print shop how to send the file and they say:
"Send us a print ready PDF. CMYK, 3mm bleed, fonts outlined, trim marks."
For most people that sentence is four separate questions: what's CMYK, what's bleed, what does "fonts outlined" mean, and what are trim marks. This post answers all four. The short version is at the bottom if you just want the checklist.
The Core Problem: Screen and Print Are Different
The reason print ready PDF is a thing, rather than the print shop just accepting any PDF, is that screens and printers produce color through completely different mechanisms.
Your screen mixes red, green and blue light (RGB) at varying intensities to produce every other color. It's additive: more light equals brighter colors, and the maximum of all three is pure white.
A printing press lays down cyan, magenta, yellow and black ink (CMYK) on paper. It's subtractive: more ink equals darker colors, and the absence of ink equals the paper color (usually white). The maximum of all four is roughly black.
These two color systems can't represent the same set of colors. RGB can produce extremely bright, saturated tones, the kind of vivid blue or green you see on a phone screen. CMYK physically cannot. The pigment doesn't exist. When a print shop receives a file in RGB, they have to convert it to CMYK before printing, and that conversion has to make judgment calls about which RGB color becomes which CMYK approximation.
If the print shop does the conversion, you don't see the result until the proof comes back. If you do the conversion (by exporting CMYK from your design tool), you see what the print shop will see, and you can adjust.
That's why "print ready" starts with CMYK.
CMYK Conversion
For most business documents, the CMYK conversion is straightforward. Body text in dark gray or black is unchanged. Section headings in muted brand colors translate reasonably. The cases that go wrong are:
- Vivid screen blues that print as dark navy or purple
- Bright greens that print as olive or muddy
- Pure RGB black (0, 0, 0) that prints as a flat dark gray rather than rich black
For Quaterio documents on the Business plan, CMYK conversion runs automatically when you select print ready export. The tool uses Ghostscript to convert each color in the document from its RGB value to the nearest CMYK equivalent, with sensible defaults for the cases above (rich black gets explicitly mapped, vivid screen colors get adjusted toward their printable equivalents).
For documents that need precise color matching, an annual report where the cover photo's blue must match the brand color exactly, your print shop will ask for an ICC profile (a specific color management standard). Most print shops accept generic ones like FOGRA39 or SWOP. Quaterio's print ready output uses sRGB IEC61966-2.1 as the input profile, which is the standard most design tools use.
Trim Marks and Bleed
The second concept print shops care about is what happens at the edge of the page.
The print shop doesn't actually print on the exact final paper size. They print on a larger sheet and then cut it down. The cut is mechanical and slightly imprecise, usually within half a millimeter of the intended line, but not exactly on it.
Two consequences:
- Trim marks. Small lines outside the printed area showing where the cut should land. The press operator aligns the cutter to these marks. Trim marks are typically 5mm from the corners of the page, at four corners.
- Bleed. Any element you want to extend all the way to the edge of the final page (a colored background, a photo that runs to the edge) needs to extend BEYOND the final page edge. If it stops exactly at the edge, the imprecise cut might leave a white sliver. Typical bleed is 3mm.
If you don't add bleed, anything that's supposed to run to the edge ends up with a hairline of white where the cut missed. If you don't add trim marks, the operator has to guess where to cut.
Quaterio's print ready export adds trim marks automatically at all four corners and applies the bleed value you specify (default 3mm) to any block touching the edge of the page. The exported PDF is larger than the final page size, that's expected, the extra is for the bleed area that gets trimmed away.
Outlined Fonts
The third concept is the one that confuses most people: what does "outlined fonts" or "fonts as curves" mean?
When you embed a font in a PDF, the PDF includes a reference to the font (or the font file itself) and the text data. The press's RIP (Raster Image Processor) loads the font when rendering the page. This usually works, but it can fail in a few specific ways:
- The press's RIP doesn't have the font and falls back to a default that looks wrong
- The font has a licensing restriction that prevents the press from using it
- The font version on the press is different from your version and renders subtly differently (kerning differences, character substitutions)
"Outlined fonts" means the font is converted from text data into vector outlines, geometric curves describing the exact shape of each letter. The press's RIP doesn't need the font anymore; the shapes are already in the file. The text is no longer editable or searchable in the PDF, but it renders identically regardless of what the press has installed.
This is mainly relevant for:
- Brand critical typography. When the headline font must look exactly right, outlining guarantees it.
- Production print runs at high volume. When you're printing 10,000 brochures, you don't want font substitution surprises.
- Older presses with limited font handling. Increasingly rare, but it happens.
For most business documents, embedded fonts work fine and you don't need outlining. For high stakes branded print runs, outlining is the safe default.
Quaterio's print ready export uses Ghostscript's -dNoOutputFonts option, which converts every glyph in the PDF into vector curves. The result is larger (because shapes take more space than font references) and not searchable, but it renders identically anywhere it's printed.
What Quaterio's Print Ready Export Does
Toggling print ready export in the editor on the Business plan does five things to the output PDF:
- CMYK color conversion via Ghostscript's
-sColorConversionStrategy=CMYK. Every RGB color in the document is mapped to its CMYK equivalent. - Outlined fonts via
-dNoOutputFonts. Text becomes vector curves; no font file required by the press. - Trim marks at all four corners, with the offset and size that print shops expect.
- Bleed at the configurable distance (default 3mm) around the page edge. Background colors and edge bleeding elements extend into the bleed area automatically.
- Embedded ICC profile describing the color space the press should interpret the file as.
The result is a PDF that any reputable print shop can take and run without back and forth questions. For most teams the difference is "the print shop accepts the file" vs "the print shop emails you twice asking for revisions before they'll print."
The same five steps are configurable per document via print settings in the editor's cogwheel menu, and they're available via the REST API by passing printReady: true in the generate request.
The Checklist
If you remember nothing else from this post:
- CMYK, your colors need to be in the right color space for ink on paper
- 3mm bleed, anything touching the page edge needs to extend 3mm past it
- Trim marks, the cutting line needs to be marked
- Outlined fonts, high stakes typography needs to be curves, not text
Quaterio's print ready export handles all four. For Business plan customers it's a single toggle in the export dropdown. For everything else you'll be in Adobe Acrobat for an hour.
When You Don't Need This
Most documents don't need print ready export. A PDF you're emailing to a client, posting to your archive or sending to a printer for a single copy is fine in default RGB. Print ready is specifically for:
- Brochures, annual reports and marketing collateral going to a commercial print run
- Documents with brand colors where the printed result must match the digital
- High volume printing where font substitution would compound across thousands of copies
- Industries where print quality is a brand signal (luxury, hospitality, finance)
For everything else, internal reports, client deliverables, contracts that get printed once to a desk printer, standard PDF export is fine and the file is half the size.
Try It
Print ready export is on the Business plan. Start with the free tier to build a business report template or project proposal, then upgrade when you're ready for print runs.
For comparisons against other tools that handle print export (InDesign especially), see the InDesign vs Quaterio comparison.
