Plagiarism.free: AI Checker

Plagiarism.free is a plagiarism checker and AI detector for your phone. Check an essay, article or assignment against pages on the public web, see your similarity percentage, find every matched source, and read the signals of AI-generated text, explained one by one.

PLAGIARISM CHECK AGAINST THE LIVE WEB
Paste or import your text and run a plagiarism check. Plagiarism.free searches the public web for the rarer phrases in your writing, reads the pages it finds and compares every sentence with them, so you see what really matches, not a guess.

SIMILARITY PERCENTAGE AND UNIQUE TEXT
Every report shows how much of your text matched and how much is unique, with the number of web pages compared.

MATCHED SENTENCES AND SOURCES
• Each matched sentence is highlighted in the colour of its source. Exact matches are underlined, similar wording is marked too.
• Tap a sentence to see the source text it matched and how close the match is.
• A list of matched sources shows how much of your text each one covers. Open a source page to compare, or copy its link.

EXCLUDE QUOTES
Properly quoted passages match their source by design. Turn on Exclude quoted text to see the score for your own words.

LONGER TEXTS AND DEEP CHECK
With credits or a plan, checks accept longer texts, and a deep check searches more of the web for each passage.

AI DETECTOR
A tab of its own for AI content detection. See whether a text shows few, some or strong AI-writing signals, with each signal explained: sentence rhythm, stock phrasing, hedging, repetition, punctuation and more. You never get a made-up probability. These are hints, not proof, so do not use them as the only reason for an accusation.

DOCUMENT IMPORT ON YOUR PHONE
Import a .txt, .docx or .pdf file with the system file picker. The file is read on your phone and never uploaded; only the text you choose to check is sent.

SHARE AND SELECT TO CHECK
Share text from your browser, notes or messages into Plagiarism.free, or select text in any app and choose Check plagiarism.

WORD COUNTER
Words, characters, sentences and reading time update as you type, with the word limit for your account.

REPORT EXPORT
Share a report, copy it, or save it as a text file or PDF made on your phone.

HISTORY
Every check stays in your history on the phone, searchable even offline. A check keeps running if you close the app, and a notification tells you when the report is ready.

FOR STUDENTS, TEACHERS AND WRITERS
Students can check an essay before handing it in and fix missing citations. Teachers can review a submission against the web. Writers and bloggers can make sure an article reads as their own.

LANGUAGES
Check text written in many languages. The app itself is available in many languages too.

HONEST BY DESIGN
Plagiarism.free compares your text with publicly accessible web pages at the moment you check. It cannot see paywalled pages, private databases or submission archives, and it never claims an accuracy figure. Use the report to review and cite, not as a verdict. If a result looks wrong, use Report this result.

FREE LIMITS AND PLANS
Without an account: 3 checks a day, up to 2,500 words each. With a free account: 8 checks a day, up to 10,000 words each. For longer texts and no daily limit, plans and credit packs are sold in the app through Google Play. One credit checks 1,000 words.

PRIVACY
• Files you import are read on your phone and never uploaded.
• No tracking or analytics SDKs.
• Create an account, sign in, and delete your account from inside the app.

Questions or ideas? Use Send feedback in the Account tab.