Every ChatGPT attachment limit: 20 a message, 3 a day on Free

The five, and how each one clears

Diagnosing it in thirty seconds

1. Read the message properly

   Wording about how many "at a time" is the per-message cap, 20 files per message on web. Wording about a limit being reached is one of the account-level caps.

2. Check Settings, then Storage

   Near 25 GB? It is storage, and only deleting helps. Comfortably under? Rule it out and move on.

3. Consider what you did recently

   A burst of uploads in the last hour points at the rolling cap. Nothing at all for days points at storage, or at a Free plan daily cap you forgot about.

4. Note where you are

   Inside a Project, or editing a custom GPT, brings its own separate ceiling into play.

The way through when you are capped

The most useful thing on this page, and it is not obvious.

Attachment limits count uploads. Pasted text is a message, not an upload. So when you cannot attach anything at all, you can still open the document, copy the text, and paste it in. It works immediately.

With one condition: keep each paste under 10,000 characters. Past that, ChatGPT converts the paste into an attachment rather than message text, and then every cap in the table applies to it again.

For a long document that means pasting in parts, and telling ChatGPT first that more are coming and not to answer until the last one arrives. Tedious, and while the parts stay under the threshold, unaffected by every limit in the table above.

Attaching fewer things in the first place

Bundle before uploading. Six documents concatenated into one text file is one attachment rather than six. For code, put a header line with the path before each file so the structure survives.

Send only the relevant part. One chapter is one attachment and usually produces a better answer than the whole book, because there is less irrelevant material competing for attention.

Convert to text. Smaller, and it strips images that get discarded anyway on every plan except Enterprise.

One that is not an attachment limit at all

If your document attaches successfully but ChatGPT clearly only read part of it, that is not an attachment limit. That is the 2 million tokens length cap, which truncates silently.

Ask what the final section is called. If it cannot say, it never got there, and nothing about your attachment allowance was the problem.