Short answer
ChatGPT Free allows 3 file uploads per day. That count covers files you attach to a chat, including images; it is not a separate image-only allowance. OpenAI says upload limits may be lowered during peak hours, so the available number can be lower. (help.openai.com)
OpenAI also says file uploads and image generation have separate usage limits, and that ChatGPT notifies you when you reach an applicable limit. A fixed reset time for Free file uploads is not established in the cited information here, so follow any limit notice shown in your account rather than assuming a midnight or rolling reset. (help.openai.com)
What counts toward the 3-upload limit?
Attaching existing photos, screenshots, or other image files for ChatGPT to inspect counts as file uploading. The File Uploads FAQ also mentions a general limit of up to 80 files every three hours, but separately specifies 3 uploads per day for Free. Don’t add the general figure to the Free allowance. (help.openai.com)
The cited information does not establish a separate image-only upload allowance or confirm a per-image size limit. If an attachment fails, check the limit message in ChatGPT rather than relying on an unconfirmed size figure.
Uploading an image is not generating one
- Upload: Attach an existing image so ChatGPT can inspect or discuss it. The Free file-upload limit applies.
- Generate: Ask ChatGPT to create a new image. This has a separate usage limit; the cited Free-tier information does not give a fixed number of generated images. (
help.openai.com)
So, 3 uploads per day does not mean 3 generated images per day. Don’t use estimates about image generation as an upload allowance.
What this means for production API use
The ChatGPT Free upload allowance is not an API allowance. For image analysis through the API, OpenAI documents image inputs using an image URL or a Base64-encoded data URL; a request can include multiple images. Image inputs count as tokens and are billed accordingly. (developers.openai.com)
API usage is billed separately from a ChatGPT subscription. To estimate image-input costs, OpenAI’s calculator uses the model, image dimensions, and detail level; its estimate does not include items such as prompt tokens or model output. Check the current API pricing and your full workflow before setting a budget. No model-specific dollar estimate is established here. (help.openai.com)
Practical takeaway: The Free plan’s three-file daily limit is for occasional ChatGPT attachments. If an application needs to process images repeatedly, assess the API workflow and its separate usage-based costs; don’t assume API use increases the ChatGPT Free allowance.
Sources
File Uploads FAQ — OpenAI Help Center
ChatGPT Free Tier FAQ — OpenAI Help Center
Images and vision — OpenAI API
Managing billing for ChatGPT and the API platform — OpenAI Help Center