Common File Formats for Design and Printing

Two files can look identical on your screen and behave completely differently on a printing press. One arrives crisp, correctly coloured and ready to run; the other triggers a phone call about missing fonts, washed-out photographs and a delivery date that is suddenly in jeopardy. More often than not, the difference comes down to the file format you chose. Understanding what each one is good at – and where it falls down – will save you time, money and a fair amount of mild panic.

Why the format matters more than it looks

Every file format makes decisions on your behalf about how artwork is stored. Some keep type as editable outlines and preserve spot colours; others squash everything into a grid of pixels or discard data to keep the file small. Those decisions matter at the point of output, because a commercial press needs predictable, high-resolution, colour-managed information.

The key questions to ask of any file are simple: is it vector or raster, is it CMYK or RGB, are the fonts embedded, and has any compression thrown away detail? Get those four right and most print problems disappear before they start.

PDF – the reliable all-rounder

For sending finished artwork to print, PDF is almost always the right answer. It is compact, universally readable and can carry fonts, images and colour information in a single file. Crucially, it can be produced to a print-specific standard.

Look for PDF/X-1a or PDF/X-4 when exporting. These are ISO standards designed for print, and they enforce the things a printer cares about: all fonts embedded, images at adequate resolution, and colour defined in CMYK or as named spot colours rather than RGB.

• Export at 300 dpi for placed images, with lossless or high-quality compression.
• Include 3 mm of bleed on every edge, plus crop marks if your printer asks for them.
• Check that transparency is either preserved (PDF/X-4) or flattened correctly (PDF/X-1a).
• Never assume a "high quality" preset is print-ready – verify the colour space and font embedding yourself.

One caution: a PDF is a snapshot. It is excellent for printing, but awkward to edit. If changes are likely, keep your working file too.

EPS – the veteran vector format

EPS is a PostScript-based vector format that has been around for decades and shows no sign of vanishing entirely. It excels at logos, icons, line art and anything using spot colours, because paths and colour definitions survive the journey intact.

Its weakness is age. The format predates modern transparency handling, so semi-transparent effects and soft shadows often get flattened or lost on export. Complex gradients and clipping paths can also cause trouble on some RIPs. If you supply EPS, convert text to outlines or embed the fonts, and flatten anything transparent before saving. Also check the preview image is present, otherwise your printer may open a file that appears blank.

TIFF – the raster standard for images

When artwork is photographic or pixel-based, TIFF is the format printers trust. It is lossless, supports CMYK and greyscale, and handles large files without complaint.

• Set resolution to 300 dpi at final printed size – not at the size you happen to be viewing on screen.
• Use LZW or ZIP compression; both are lossless and simply reduce file size.
• Flatten layers and remove unnecessary alpha channels unless your printer has asked for them.
• Supply images as TIFF rather than JPEG wherever possible.

TIFF files are big, and that is fine. Storage is cheap; a reprint is not.

Native files and packaged folders

Sometimes a printer genuinely needs your working file – for a last-minute text change, a colour adjustment or a long-term project where artwork will be reused and updated. In that case, send the native document plus everything it depends on.

A properly packaged folder contains the document itself, all fonts used, all linked images at full resolution, and any colour swatches or profiles. Save a copy first and consider sending an older, widely supported version of the file if your software is very new. Always include a PDF alongside it as a visual reference, so there is no ambiguity about how the job should look.

Equally, do not send editable files when a PDF would do. It invites accidental alterations and version confusion.

Formats to avoid for print

JPEG and PNG are screen formats, not print formats. JPEG uses lossy compression, which quietly removes detail around edges and in smooth gradients – you may not notice on a monitor, but you will on a printed page. PNG supports transparency nicely but is RGB only, with no CMYK equivalent.

Both are perfectly acceptable for internal mock-ups, email proofs and website use. Just do not let one find its way into a final press-ready file.

A short checklist before you send

• Final artwork as PDF/X-1a or PDF/X-4, fonts embedded, 3 mm bleed included.
• Images as 300 dpi TIFF in CMYK or greyscale.
• Vector logos as EPS with text outlined and transparency flattened.
• Native files only when asked, supplied as a complete package with fonts and links.
• No JPEG or PNG anywhere in the print supply chain.

Pick the format that matches the job, label your files clearly, and everyone involved – designer, printer and client – will have a far calmer week.