ChatGPT file upload not working? Find your error here

"You've reached our limit of file uploads"

The most confusing message, because it commonly appears when you have uploaded almost nothing.

Three separate limits can produce it:

Two details from OpenAI's FAQ explain nearly every confused case:

Failed attempts count. A file you retried six times because it kept failing spent six of your slots. This is the usual explanation for hitting a cap while feeling like you barely uploaded.

Storage is shared and cumulative. The 25 GB ceiling covers your chats, your Projects and your custom GPT knowledge together, and a Free account runs into a separate Library allowance of 500 MB long before it reaches that. Deleting the chat no longer deletes the files in it, so something you uploaded months ago is still using the quota.

What to do, in order: check you are signed into the right account and plan, delete the large files themselves under Settings then Storage rather than the chats that held them, wait an hour if it is the rate cap, and check status.openai.com in case it is not you at all.

"The file is too large"

Two different ceilings produce similar wording.

Actual size. The hard limit is 512 MB per file, about 50 MB for CSV and spreadsheets, and 20 MB per image. If you tripped the spreadsheet limit, exporting to CSV usually drops the size sharply.

Length. More commonly the real problem. Text and document files are capped at 2 million tokens per file, and spreadsheets are exempt. A long report can be a couple of megabytes and still be well past what fits.

For a size error, compress the file or export it to plain text. For a length problem, see how to get past the upload limit.

The upload works but ChatGPT only read part of it

No error, no warning, and the most damaging failure on this page.

When a document is past the length cap it is truncated rather than rejected. ChatGPT summarises what it received and sounds entirely confident about it.

How to catch it: ask something only answerable from the end of the document. "What is the final section called?" If it cannot say, it never got there.

How to fix it: split the document and send the parts in order, with an instruction up front not to answer until the last one arrives.

The PDF uploads but comes back empty

Your PDF is a scan.

Every plan except Enterprise does text-only retrieval: ChatGPT extracts the digital text and discards the images. A scanned page is a photograph, so there is no text to extract and nothing comes back.

Check it in two seconds by trying to select text in the PDF. If your cursor draws a box over the page rather than highlighting words, it is an image. Run it through OCR and upload again.

"You may only upload 1 file at a time"

A cap on how many files go in one message, not a problem with your file. On the web the cap is now 20 files per message, doubled from 10 in February 2026, so a message about one file at a time usually means an older client or a feature with its own lower cap. Send them one per message and it clears.

Inside a Project, separate caps apply: 5 files per project on Free, 25 files per project on Go and Plus, 40 files per project on Pro, Business, Education and Enterprise, with 10 files at once on any plan. Custom GPTs allow 10 files per GPT for the lifetime of the GPT rather than per conversation, though GPT creation now exists only in Business, Enterprise and Edu workspaces, so a personal account cannot reach that one at all.

The upload bar fills and then nothing happens

Usually the connection or the tab rather than the file.

Refresh the page and try once. Then try a different browser. Then disable extensions, since an aggressive ad blocker or privacy extension can interfere with the upload request. If a small text file also fails, the problem is not your document.

Remember that each failed attempt spends a slot from your rolling cap, so retrying twenty times makes the next problem worse.

Nothing here matches

Two things worth checking before you conclude it is broken.

Check status.openai.com. Uploads have their own incidents and it is not always obvious from inside the app.

Then test with a tiny plain text file containing one sentence. If that uploads, the platform is fine and the problem is your specific file, which puts you back at the top of this page. If even that fails, it is not you, and waiting is the answer.