Why the message goes on the left and the address on the right: the story of the postcard's back
Published on 9 September 2026 · 3 min read
Flip over any postcard: message on the left, address on the right, stamp in the top corner. The layout is so familiar you no longer notice it. Yet it took thirty years of regulations, workarounds and complaints to get there. For a long time, writing anything on the back of a postcard was simply forbidden.
The back belonged to the address, and nothing else
When postcards first appeared in the 1870s, the post office was firm: the reverse side was for official use. You wrote the recipient's name and address, stuck on the stamp, and that was it. Your message had to squeeze onto the front. As long as cards were blank, that worked fine. But the moment printers began covering the front with town views, monuments and seaside scenes, the writing space shrank to almost nothing.
People improvised. They wrote in the white margin left beneath the picture, then across the sky, then straight over the cathedral's façade. Publishers followed demand and shrank the image to free up a corner for writing — the so-called "vignette" cards, with the view floating in the middle of the card. On old postcards you can still read these messages perched on rooftops and clouds, in tiny handwriting to save room.
1902: one vertical line changes everything
The solution fit on a single line. Britain adopted it first, in 1902: split the back in two with a vertical rule down the middle, message on the left, address on the right. France followed in 1904, Germany the year after, the United States in 1907. This was the birth of the "divided back", and the start of the postcard's golden age: the picture could finally fill the whole front, and the message got a proper half of its own. Collectors still date a British card by that one detail: no line, it's from before 1902; a line, it's from after.
The format froze there, more than a century ago, and nobody has ever wanted to change it. A Brazilian, Japanese or Norwegian postcard follows exactly the same plan as yours. The postie finds the address at a glance, and the person you wrote to finds your words on the other side of the line.
One side for the eyes, one side for the heart
That split says something true about postcards: one face to show, one face to speak. It's exactly what we've kept at UnCoucou. Your photo fills the whole front, edge to edge, with no artificial cloud to cram text into. On the back, your message gets the left half and the address the right, just like the cards of 1902. You write from your phone, we print in premium quality and post it for you, from €2.49 all inclusive. The vertical line is still there, too. Some good ideas don't need updating.