Printing flyers for a local event, posters for a school fair or business cards for a side project should be easy. Yet many people are caught out when the print shop replies: "Your file is low resolution," "We need bleed," or "Please send a print-ready PDF." These terms can sound technical, but the ideas behind them are straightforward. This guide explains what printers need and how to prepare files that print the way you expect.
Why print is different from screens
Screens display images using light and relatively few pixels per inch. Printed paper needs much more detail to look sharp, and it uses ink, which mixes colours differently. A file that looks perfect on a phone may look blurry or dull on paper. Most problems come from these differences.
Resolution: aim for 300 DPI
DPI, or dots per inch, describes how much detail an image has at its printed size. For most print jobs, 300 DPI at the final size is the standard. A photo that is 3000 pixels wide prints sharply up to about 10 inches wide. Stretch it to a two-foot poster and it will look soft.
To check, divide the image's pixel width by the print width in inches. If the result is well below 300, find a larger original or print smaller. Large posters viewed from a distance can get away with 150 DPI.
Bleed: why printers want extra edges
If your design has colour or images running to the edge of the page, the printer needs a little extra beyond the final size, usually 3 mm or 1/8 inch on each side. This is called bleed. Paper is trimmed after printing, and the cut is never perfectly exact. Bleed ensures there is no thin white line at the edge if the cut shifts slightly.
Keep important text and logos inside a "safe zone" a few millimetres inside the trim line, so nothing gets cut off.
Colour: RGB vs CMYK
Screens use RGB colour, while printing presses use CMYK inks. Very bright greens, blues and oranges on screen may look duller in print because inks cannot reproduce them exactly. Many print shops convert files automatically, but if colour accuracy matters, ask whether they prefer CMYK files and request a proof before the full run.
The preferred format: PDF
Most printers prefer a PDF because it keeps layout, fonts and images together in a single file. When exporting from a design tool, look for options like "PDF for print" or "high quality print," and enable bleed and crop marks if requested.
Avoid sending Word documents, PowerPoint files or screenshots unless the shop specifically accepts them. Fonts and layouts can shift when opened on another computer.
Fixing common file problems
Sometimes you have the right content in the wrong format. Your designer may have sent PNG images, your phone may have saved HEIC photos, or a multi-page flyer may be split into separate files. Free browser tools like FileOtter can convert images to PDF, merge pages into one document and adjust file sizes, which helps when a print shop's upload form only accepts a single PDF. Be careful not to compress files intended for print too heavily, as that reduces image quality.
File naming and communication
Name files clearly with the job, size and version, such as SpringFair-Poster-A3-v2.pdf. In your order notes, include the paper size, quantity, single or double-sided, paper type and deadline. If the shop offers a free proof, take it.
A pre-print checklist
- Correct final size set in the design.
- Images at 300 DPI at the printed size.
- Bleed added if colour runs to the edge.
- Text inside the safe zone.
- Exported as a high-quality PDF.
- Fonts included or converted, according to your design tool's export options.
- File clearly named, and order details noted.
Small jobs at home
For home printing, the same principles apply on a smaller scale. Use high-resolution images, print a test page in draft mode first and check margins, since most home printers cannot print right to the edge.
Confidence at the counter
Print shops are generally happy to help, but arriving with a print-ready file saves time, money and reprints. Once you understand resolution, bleed, colour and PDF export, your next flyer or poster will come out looking as good on paper as it did on screen.
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