OpenAI might start watermarking ChatGPT images — but only for free users

By Willow Roberts Published April 7, 2025

Everyone has been talking about ChatGPT’s new image-generation feature lately, and it seems the excitement isn’t over yet. As always, people have been poking around inside the company’s apps and this time, they’ve found mentions of a watermark feature for generated images.

Spotted by X user Tibor Blaho, the line of code image_gen_watermark_for_free seems to suggest that the feature would only slap watermarks on images generated by free users — giving them yet another incentive to upgrade to a paid subscription.

This isn’t the first time OpenAI has played around with the idea of watermarks, however. Reports last year revealed that the company had developed a tool for watermarking AI-generated text as well, but ultimately didn’t release it.

This decision was criticized by many since it appeared to put profits ahead of responsible conduct — watermarking would help keep AI-generated content from appearing in places it shouldn’t be, but if people can’t use the product freely, they’re more likely to lose interest in it.

Watermarking images generated by free users, on the other hand — well, that could have a positive impact on profits if handled correctly. There’s no saying yet whether this feature will see the light of day, but users could have plenty to say about it if it does.

The most important thing is how these watermarks look — the term itself suggests text or logos would be overlayed on top of the image, but that might not be the case. Google’s watermarking system for AI images, for example, isn’t visible to humans. It tweaks a small number of pixels to make a pattern for watermark detection tools to find.

This kind of approach is useful on multiple fronts — it doesn’t spoil the image for human viewers and it’s also harder to remove the watermark by cropping, adjusting, or photoshopping the image.

It would certainly keep free users happier — but on the other hand, the decision to remove it for paid users would seem weirder. If the images look the same either way, then the only benefit paid users would get from losing the watermark is the ability to try and pass their AI-generated images off as human-made or as real photographs. And if that doesn’t sound dodgy, I don’t know what does.

This is all speculation, though — there are no details available about this potential feature and OpenAI might never release it anyway. Perhaps if enough people ask Sam Altman about it on X, he’ll respond.