Not every printer is suitable for printing on postcards. But even if your printing device is suitable, it is not so easy to make an inscription on a postcard without spoiling the last one.
Oddly enough, old dot matrix printers, as well as typewriters, are best suited for printing on postcards. They differ from all other similar devices in that they allow you to manually feed the paper. Thanks to this, you can print on paper of increased density, non-standard size, with folds, etc., which is just typical of postcards. Try purchasing one of these devices from an online auction.
Load the postcard into the printer or typewriter in the open state so that the surface on which the printing will take place is facing the head or levers. In the case of a printer, you must align the left border of the postcard with the left border of the printable area, otherwise the head may touch the edge of the paper.
Using a typewriter, you can put a congratulatory inscription on a card the first time. But remember that you have no room for error. Just one incorrectly typed letter - and you have to buy a new postcard. Type slowly and carefully.
If you use a printer, this problem is removed, but another arises - the correct position of the text. It is important that he gets on that part of the postcard that is not occupied by anything. Make a test print on a sheet of thin paper that is the same size and loaded in the same way. Then combine it with the postcard and check if the text is in the right part of it. Correct the layout if necessary and make a new test print. Only after making sure that everything matches, print directly on the card.
Some inkjet printers are also suitable for printing on postcards, but only those that are specially designed for printing on thick paper. Align text as described above, then print only on a matte surface. The glossy ink is easy to wipe off with your finger.
Do not use laser printers for printing on postcards, even if the gloss is on the back. The heating roller could be damaged. If your printer is not perfectly suited to work with postcards, use the last option: print out on thin paper, cut it out and carefully glue it to the postcard.
Do not cover the lettering with tape. Everything will look perfect at first, but then the glue can gradually dissolve the dye and the image will become blurry.