You can check a Google Doc for plagiarism by copying the text and pasting it directly into a plagiarism checker, or by downloading the document as a .docx or .txt file and uploading it to the tool of your choice.
Most online plagiarism checkers do not integrate natively with Google Docs, which makes the copy-paste method the most reliable approach in practice. For best results, check the document section by section if it is particularly lengthy, as many free tools impose word-count limits per scan. It is also important to review the similarity report carefully, since matched text that is properly cited should not be treated as plagiarism.
See how the leading tools compare in our guide on best free plagiarism checkers in 2026. Quetext's Plagiarism Checker accepts pasted text and .docx uploads.