Submitting a print-ready file is the single most important step in ensuring your finished product looks exactly as you intended. Whether you're designing business cards, flyers, banners, or brochures, the same fundamental principles apply. Getting these right eliminates delays, avoids costly reprints, and ensures colour accuracy across every piece in your run.
Resolution is the foundation of print quality. For anything that will be viewed at arm's length — business cards, flyers, leaflets, brochures — your images should be at least 300 DPI (dots per inch) at the final print size. For large-format prints like banners and posters that are viewed from a distance, you can get away with 150 DPI. Never upscale a low-resolution image in Photoshop and expect it to print well; the softness and artefacts will be clearly visible.
Bleed is the extra area around your design that extends beyond the trim line. Standard bleed is 3mm on all sides for most print products, though large-format items may require more. Any background colours, images, or design elements that extend to the edge of the finished piece must continue into the bleed area. Without bleed, you risk thin white lines appearing along the edges where the guillotine cuts aren't perfectly aligned — which is inevitable across a large print run.
Colour profiles are where many designers trip up. For commercial printing, always use CMYK (Cyan, Magenta, Yellow, Key/Black) rather than RGB (Red, Green, Blue). RGB is designed for screens and contains colours that physically cannot be reproduced with ink — particularly bright blues, vivid greens, and neon tones. Converting from RGB to CMYK at the end of your design process can result in dull, muddy colours. Start in CMYK from the beginning and you'll have accurate colour expectations throughout.
Export your final file as a high-quality PDF, ideally using the PDF/X-1a or PDF/X-4 preset. These presets embed fonts, flatten transparency correctly, and ensure CMYK colour space. If you're using Adobe InDesign, the 'High Quality Print' or 'Press Quality' presets are excellent starting points. From Illustrator, use 'Save As PDF' with the same settings. Avoid exporting from PowerPoint or Word for professional print — the output is unreliable and often causes font, colour, and resolution issues.
Fonts should always be outlined (converted to shapes) or embedded in your PDF. If a font isn't embedded and the printer's system doesn't have it installed, the text will reflow with a substitute font — changing your entire layout. In Illustrator, select all text and go to Type > Create Outlines. In InDesign, the PDF export process handles embedding automatically if you use the correct preset.
Finally, always include crop marks and keep a safe zone of at least 3-5mm inside the trim line. Critical text and logos should never be closer than 5mm to the edge. Send a proof to yourself or a colleague before submitting — fresh eyes catch mistakes that hours of staring at a screen will miss.