The standard size for a business card is 90mm x 55mm. While you can design a business card at any size to be eye catching (we have seen triangular cards), consider that many people use mass produced business card holders which may mean that your card does not fit and may not be kept.
When designing your card please ensure that if you are wanting your card printed full bleed (with colour from edge to edge of the card) that your design includes at least 3mm bleed (this is extra area around the card to allow for trimming). We also suggest that you avoid critical detail being closer that 3mm from the edge of the card (indicated by grey on the detail), and we also don't suggest that you have a frame around the edge. The reason for this is because there is always movement within the printing process and as a result when the cards are cut we may not be cutting exactly on the crop mark, hence the requirement for bleed and the suggestion to avoid detail being close to the edge.
If you have any questions it is usually easier to call and get the answers before you start designing to avoid any extra costs that may be incurred if we need to fix your file so it is suitable for printing.
When supplying your electronic file for digital printing we always prefer to receive your cards in PDF format. This will happen automatically if you print using Web to Print, or alternatively our PDF Resource page lists a number of free PDF creation options. If your job is to be offset printed (eg you need specific Pantone colours, embossing or foiling) then usually we would prefer the native file. You can supply them 1up on the sheet as we have software that will automatically gangup multiple cards to fill the sheet.