Free Grok AI detector to check any text
A free Grok AI detector for any text. Paste it, upload a file, or drop in a link.
Check your textHow to read your AI detector score
The AI detector gives you a single number from 0 to 100. It is the estimated chance that AI wrote the text, not a yes or no. Here is what each band means.
Probably a person
Reads like human writing. We did not pick up the patterns a model tends to leave behind.
Hard to say
Some of it leans one way, some the other. Read it yourself before you draw a conclusion.
Probably AI
This has the marks of machine-written text. Read it closely before you conclude anything.
How the Grok detector works
Three steps, a few seconds, no setup.
Add your text
Paste it, upload a Word or PDF file, or drop in a link to the page you want to check.
We check the patterns
The model weighs your text against the way Grok writes and the way people write.
Read the score
You get a number from 0 to 100 and a plain read on how likely AI was involved.
What gives Grok away
Grok, from xAI, is tuned for a more casual and sometimes irreverent tone than its rivals. But under the personality, the mechanics are familiar: even pacing, safe word choices, and a habit of wrapping up tidily. The jokes tend to land in predictable spots.
Real writing is rougher and less performed. Our Grok AI detector is trained on Grok's output against human writing, so it reads past the casual voice and onto the underlying rhythm a model leaves behind.
How accurate is this Grok AI detector?
On clean test text it is right most of the time, comfortably above nine in ten. Real writing is messier, so treat the score as a strong hint, not a fact. No detector is certain, and you should distrust any that claims to be.
Short snippets and heavily edited text are the weak spots. Rewriting or paraphrasing Grok's output blurs the tells, and the casual style can make borderline cases trickier.
Grok 2, Grok 3 and Grok 4
The detector covers Grok across its releases, from the earlier Grok 2 through Grok 3 and the Grok 4 generation from 2025. Newer Grok models write with more range, so recent text can sit closer to the borderline than older output.
- Nov 2023 Grok 1
- Aug 2024 Grok 2
- Feb 2025 Grok 3
- Jul 2025 Grok 4
Where your text goes
The check happens in memory on our own server. As soon as you have a score, your text is dropped. No logs, no database, no training set.
There is no account holding a history of your checks either.
Grok AI detector FAQ
Is the Grok AI detector free?
Yes. The whole tool is free, with no account and no cap on how many checks you run.
Does it work on Grok 4?
Yes. It reads output across Grok's versions. The newest releases are harder to flag, so weigh borderline scores carefully.
Will it catch Grok text I edited?
Sometimes. Light edits often slip through. Heavy rewriting or paraphrasing can hide the tells well enough to fool it.
Can I upload a file or a link?
Yes. Upload a Word or PDF file, or paste a web address, and we'll pull the text out for you.
Does it work on ChatGPT or Claude too?
Yes. The same model covers ChatGPT, Claude and others. For general use, try the main AI detector.