Marketplaces enforce title limits in two ways. Some replace a long title: since 27 July 2026 Amazon has been swapping titles over 75 characters for its own AI suggestion. Others accept it but cut it on screen, like Google Shopping, where Google says shoppers usually notice only the first 70 or fewer characters.
The safe pattern is the same everywhere: brand, product type and the one attribute that sells it come first. Materials, sizes and use cases go later. On Amazon they go into the 125-character Item Highlights field, which is searchable too.
Selling on several marketplaces? Check one title against all of them at once, or fix a whole catalog file in one upload.