Getting a novelty passport stamp at tourist sites like Machu Picchu feels cool, but what is the disastrous downside?

A souvenir stamp can complicate your passport

A novelty stamp from a tourist attraction may look like harmless decoration, but a passport is an official travel document, not a scrapbook. Its pages are intended for visas and marks placed by border or other authorized officials. A souvenir stamp can be treated as an unauthorized alteration, and that may prompt a border agent or airline to question whether the document is acceptable.

The risk is real, but not automatic

A stamp does not necessarily make every passport invalid everywhere. The problem is that travelers cannot count on each country or carrier to view an unofficial mark the same way. If officials consider the passport altered or damaged, you could face extra scrutiny, be refused boarding or entry, or need to replace the document before continuing your trip. The stamp itself may be small; the disruption can reach the whole itinerary.

That uncertainty matters most when a passport is already crowded, damaged, or contains marks that could be mistaken for official ones. Removing a stamp is not a reliable fix: trying to erase it can damage the page and make the document look more altered.

Keep the memento out of the travel document

If a site offers a souvenir stamp, use a separate notebook, postcard, or dedicated travel journal. If one has already gone into your passport, do not try to scrub it off. Check with your country’s passport authority or an embassy before traveling, especially if your departure is soon. A little keepsake is not worth risking a document that may be needed at every border on the rest of the journey.