Software and Printing: Why We Ask for a PDF

Every time a print business asks for a PDF or a print-ready PNG, that request exists because of decisions made in the 1980s and early 1990s. The file formats behind modern printing have their own history, and it explains why some files print perfectly and others don't.

PostScript: A Common Language for Printers

Before 1984, every printer manufacturer effectively spoke its own language, so a document designed for one machine often wouldn't print correctly on another. Adobe's PostScript, created by John Warnock and Charles Geschke, solved this by becoming a universal page-description language: a way of describing exactly what a page should look like, independent of whatever printer eventually output it. It's the reason a design can be sent to a completely different printer than the one it was created on and still come out right.

The Adobe Toolchain

PostScript was the foundation for the design software that followed: Illustrator, Photoshop and later InDesign, all built around the same idea of precise, device-independent page description. Together with early desktop publishing software, they turned professional print design from a specialist trade into something achievable on an ordinary desk.

1993: The Portable Document Format

PDF, introduced by Adobe in 1993, solved a related but different problem: sharing a finished, print-ready document that would look and print identically no matter what computer or printer opened it. That reliability is exactly why PDF became, and remains, the standard format for sending artwork to a printer.

Why File Format Still Matters

This history is why we're specific about what we ask for: a PNG with a genuinely transparent background, or a properly exported PDF, prints reliably because the file describes exactly what should appear on the page. A screenshot or a low-resolution JPEG doesn't carry that same precision, which is where print quality problems usually start.

Where This Shows Up in What We Print

We accept PNG, JPG, PDF, AI and SVG files across our custom clothing printing and business stationery ranges, and we'll flag it honestly if a file isn't print-ready before anything goes to press.

Frequently asked questions

Why do printers prefer PDF files?

PDF, introduced by Adobe in 1993, was designed so a document looks and prints identically regardless of what computer or printer opens it, which is why it became the standard format for sending artwork to print.

What is PostScript and why does it matter for printing?

A page-description language created by Adobe in 1984 that describes exactly what a page should look like, independent of the specific printer used, solving the problem of documents printing differently on different machines.

What file formats do you accept?

PNG with a transparent background, JPG, PDF, AI and SVG. We'll tell you honestly if a file isn't print-ready.

From the desk to the page: 1985 and the desktop publishing moment

The pieces that made modern artwork supply possible arrived within a few months of each other. Apple introduced its LaserWriter printer in January 1985, and Aldus released PageMaker in July 1985. Paul Brainerd, who founded Aldus, is the person credited with the phrase "desktop publishing". For the first time a designer could lay out a page on screen and see a close match on paper, using equipment that sat on an ordinary desk instead of in a typesetter's workshop. Photoshop followed in 1990: version 1.0 was released on 19 February 1990 and was written by two brothers, Thomas and John Knoll. The habit of preparing artwork on a computer, then passing a file to someone else to produce, dates from this period.

The image formats you will actually be asked about

Several of the formats printers mention have their own dates, and each one was built to solve a specific problem.

• JPEG was approved as a standard on 18 September 1992. It shrinks photographs by permanently discarding detail, and each time a JPEG is opened, edited and saved again, a little more is lost. That is why a photo that has been forwarded through several chat apps often looks soft or blocky.
• PNG was approved by the World Wide Web Consortium on 1 October 1996. It was designed as a free alternative to GIF after a patent dispute over GIF's compression in 1994. It is lossless and supports proper transparency, which is the reason a PNG with a see-through background suits a garment design so well.
• SVG became a W3C Recommendation on 4 September 2001. It describes shapes, lines and curves as instructions rather than a grid of pixels, so it can be enlarged to any size without going fuzzy.
• PDF became an ISO standard (ISO 32000-1) in 2008, fifteen years after Adobe first released it. Adobe also published a royalty-free patent licence in 2008 so that anyone could build software that reads and writes PDFs.

Pixels versus shapes

This history explains the single most useful distinction in artwork. A JPEG or PNG is a raster file: a fixed grid of coloured dots. Enlarge it and the software has to invent detail that was never captured, so edges blur. An SVG, or a vector PDF or AI file, is a set of shapes, so it stays sharp at any size. A small logo copied from a website header is nearly always raster and made for a screen, which is why it can look fine on a phone and poor on the front of a hoodie.

Practical checks before you send a design

• Look for the largest version of the file you have. The original from whoever designed the logo is better than a screenshot of it.
• Do not re-save a JPEG repeatedly to "fix" it. Each save loses a little more.
• If the design has a see-through background, send a PNG or vector file, not a JPEG. A JPEG cannot hold transparency, so a white box usually appears behind the artwork.
• Convert text to outlines, or send the PDF, if you used an unusual font. Otherwise the printer's computer may substitute a different typeface.
• Say where the design will go and roughly how large. A graphic that works on a chest print may not hold up on a large back print.
• Keep fine lines and tiny text to a sensible minimum, because very thin details can be lost on fabric even in a sharp file.

Colour on screen versus colour on fabric

Screens build colour from red, green and blue light. Ink on fabric works differently, so a vivid neon on a monitor may look a touch calmer when printed. Pastel gradients and very dark shades next to each other are also harder to judge from a screen. This is one reason we show a proof before anything is printed, and why we suggest you look at it on the largest screen you have rather than squinting at a small preview.

Why DTF changed what artwork needs

Because DTF prints the design onto film first, then transfers it to the garment, the artwork is treated as a self-contained graphic. Photographs, gradients and many colours are normal subjects. What matters most is that the file is clean, large enough, and has a genuinely transparent background where one is wanted. If you would like to see how the process itself works, our DTF printing explained guide covers it, and the artwork and file preparation guide goes through the practical checklist in more detail.

Common mistakes with files

Can I send a screenshot of my design?

You can send it, and we will tell you if it is too small to print well. A screenshot is usually the size of your screen, so it holds far fewer pixels than the original file. Sending the original, or the largest copy you have, gives the best starting point.

Why does my logo have a white box around it?

Most likely the file was saved as a JPEG, or as a PNG with a solid white background rather than a transparent one. Ask whoever made the logo for a transparent PNG, an SVG or a PDF, or send what you have and we can look at what is possible.

Is a Word document a good way to send artwork?

It is not ideal. Word can compress pictures inside the document and change fonts when it is opened on another computer. Exporting the finished design to PDF, or sending the original image files separately, avoids both problems.

What if I only have a photo of a drawing or a sign?

Send it anyway. A well-lit, straight-on photo is often enough to start from, and we can talk through whether it needs redrawing or tidying. Give your deadline when you request a quote and order early, because rebuilding artwork takes time.