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Three scan types

A scan is either text or image, never both. The two text scans can run together on the same text; an image scan runs alone. Cheat Detection and the AI Source Match tag are part of the plagiarism scan, not separate scans - see Results.

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OCR - PDFs, scans and photos

Both text scans accept files that are not plain text - a PDF, a scanned page, a photograph of a document. Copyleaks extracts the text and scans that. That is still a text scan.

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The 350-character AI minimum

AI Detection needs at least 350 characters. Below that it does not run at all and no AI score comes back - the scan still runs for plagiarism, which has no minimum. A blank AI score means not measured, never nothing found. Your agent reports which checks actually ran.

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Long text goes as a file

Pasted text is capped at 25,000 characters. A file has no character ceiling, so if a paste is refused for length, send the same content as a file instead.

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Getting a document to Copyleaks

An agent cannot pass a file from one connector to another. A Drive or Dropbox connection gives your agent the file; it does not give Copyleaks the file. The maximum size depends on the file type. When your agent asks for an upload address, the answer carries the exact limit for that file. There’s no fixed size between the two: it depends on how much room your agent has left in the conversation, and your agent chooses. Anything past a small file should use the upload slot, which keeps it out of the conversation. The upload step needs a client that can run a command on your machine - what works where. Without one, upload larger files in the Copyleaks app and ask your agent to read the scan.

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Images

Copyleaks scans the image you actually have, byte for byte. Any alteration - resizing, cropping, converting, re-saving - changes the answer. Your agent will not modify an image to make it fit; if it cannot send the original, it says so. An image always goes through the upload step, never inline, so it needs a client that can run commands. For any other format, upload the image in Copyleaks and ask your agent to read the finished scan. An image refused on any of these bounds spends no credit. Size and format are refused before sending; an image outside the pixel bounds comes back as a failed scan with the reason. An image scan returns a score and confirmation the picture was checked - nothing pixel-level. Open the report for anything visual.

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Web addresses

Scanning a web address means Copyleaks fetches it, without your sign-ins. So Google Docs and Drive, SharePoint and OneDrive, Notion and Dropbox return a sign-in page, not your document. Copyleaks cannot tell the difference, so it scans that sign-in page and spends credits on it. Send the document as a file instead. To scan something in Drive, SharePoint or Notion, save it to your computer and send the file. A client that can run commands can save and upload it for you. In the Claude chat, attach the file yourself or upload it in the Copyleaks app.

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Several files at once

Up to ten files in one call, each its own scan, spending credits separately. Ten is a deliberate guard so one mistaken instruction cannot spend a large share of your balance - send the rest as a second call.