How to Make a Custom Photo Postcard That Prints as Sharp as It Looks

Everything else on this page is recoverable. Resolution is not. A file that arrives at 900 pixels across gets printed at 900 pixels across, and the softness shows up on a card held twelve inches from someone's face.

The rule is 300 dpi measured at the finished size, with bleed counted in. Do the arithmetic once and it stops being abstract.

That last column is 200 dpi, the point where a photograph is still acceptable and type over it starts to look furry. Below it, print the card smaller rather than pretending.

Here is the part that catches people. Your phone is almost certainly good enough: a 12 megapixel camera gives roughly 4032 by 3024 pixels, which covers a 6 by 9 card comfortably. What fails is the copy of the copy. A photo pulled out of a group chat, saved from a social post, or exported from a shared album at reduced size often lands near 1080 pixels wide, which fills 3.6 inches and no more. Go back to the original on the camera roll every time. If the difference between the two numbers on a file is confusing, DPI and PPI explained untangles it in a page.

A monitor makes color by emitting light. Paper makes color by absorbing some wavelengths and bouncing the rest back at you. Those are different physics, and there are colors a screen can show that no ink set can reach.

In practice the shifts are predictable. Bright cyan skies come back a shade deeper and slightly greyer. Electric greens in grass and foliage lose their glow. Vivid purples and hot pinks are the two that most often surprise people, because they sit right at the edge of what CMYK can print. Skin tones, browns, greys and most muted palettes travel almost unchanged.

The fix is not to argue with the press, it is to see the shift before you commit. Convert the file to CMYK on your own machine, look at it, and adjust while you still have the layers. If a sky flattens out, lift the contrast a little rather than the saturation. Converting RGB to CMYK for print covers the profile settings.

Stock changes the result as much as the conversion does. Gloss coated keeps ink sitting on the surface, which holds saturation and gives a photograph snap. Matte coated calms it slightly and is easier to read text on. Uncoated absorbs ink into the fibre, so photographs come out softer and darker, which suits a muted or vintage image and fights a bright one. If somebody has to write on the card by hand, uncoated is the only comfortable choice.

You do not need design software for this. Open the online Designer, choose the postcard size, and the canvas arrives with the bleed, the trim and the safe zone already in place. Upload your photo, scale it until it covers the outer dashed edge, and drop your text inside the inner guide. The Designer will not let a photo sit short of the bleed line without telling you, which is the single most common file error it removes.

Where the Designer stops being the right tool is color critical work. If the photograph is the product, a family portrait you are printing a hundred of, or artwork you have already color corrected, prepare it in Photoshop or Lightroom, export a flattened CMYK PDF at the bleed size, and upload that instead. You keep control of the conversion that way. For type over a photograph, pick something with weight: postcard fonts that hold up explains why a thin script disappears into a busy image.

Then pick the format. Standard postcards start at $16.48 and cover the great majority of photo cards. Folded postcards at $84.36 give you four panels instead of two, which is what you want when one photo is not the whole story. Custom shaped postcards at $135.11 cut the card to an outline, and they are worth the money only when the shape says something the photo cannot. Direct mail postcards at $89.68 add addressing and the USPS handoff. Everything sits together on the postcard printing page if you want to compare stocks and sizes first.