Short answer
We could not confirm a current official numerical allowance. A third-party guide reports 3 file uploads per day on ChatGPT Free, with each image counting as one file. Treat that as a reported figure—not a confirmed current OpenAI allowance. The guide describes a file-upload count, not three image slots reserved only for pictures. (Third-party guide)
What counts—and when does it reset?
The guide says a photo or screenshot counts as one file upload. Whether other file types share that allowance, and whether the reported three-per-day figure is the current official limit, remain unconfirmed. (Third-party guide)
OpenAI’s Free Tier FAQ says file uploads and image generation have separate usage limits, and that ChatGPT will notify you when you reach an applicable limit. We could not confirm a reset window for the reported upload allowance, so follow any timing shown in your account rather than assuming a midnight or 24-hour reset. Uploading an image for ChatGPT to inspect is different from asking it to generate one. (OpenAI Free Tier FAQ)
If you’re processing images in a production workflow
ChatGPT’s consumer upload allowance is separate from API usage. OpenAI says API usage is billed separately from a ChatGPT subscription, and API requests have their own file requirements and limits. For a production budget, check the price for the specific API model and estimate image-input costs using the image dimensions and detail level; the OpenAI image cost calculator notes that its estimate excludes other prompt tokens and model output. API use is a separately billed route, not a way to extend Free ChatGPT uploads at no cost. (OpenAI billing guidance; API pricing)
Sources
ChatGPT Free/Go/Plus Image Upload Limit: How Many Images Per Day?