How to Use
Everything you need to know, with real examples.
What does this do?
Fact Check Analyzer checks whether a statement is true or false — using AI to search evidence and reason through it.
You type a claim. It gives you a verdict, a confidence score, an explanation, and the sources it used. You can also upload a document — a PDF, spreadsheet, or report — and check claims about what's inside it.
It works best for: historical facts, science claims, statistics, document contents.
It cannot check: opinions, questions, math, or breaking news from the last few weeks.
Step by step
Choose your input type
Type your claim as a statement, not a question
How tall is Mount Everest? (question — won't work)
Mount Everest is the tallest mountain on Earth. (statement — works)
Click "Analyze"
Read your result
- Verdict— True, False, Disputed, or Unverifiable
- Confidence— how certain the AI is, from 0% to 100%
- Reasoning— a plain-English explanation of why
- Sources— links to the evidence used (for text claims)
Leave feedback (optional)
What results look like
Example 1 — a false claim
The Great Wall of China is visible from space with the naked eye.
Astronauts and NASA have consistently confirmed the Great Wall is not visible from low Earth orbit with the naked eye — it is too narrow. Chinese astronaut Yang Liwei confirmed this after his 2003 spaceflight.
- NASA — Visible EarthHIGH
- Scientific AmericanMEDIUM
Example 2 — a true claim
Humans share approximately 98% of their DNA with chimpanzees.
Genetic research consistently shows humans and chimpanzees share roughly 98–99% of their DNA sequences. This is supported by multiple genome sequencing studies including the 2005 chimpanzee genome project.
- Nature — Chimpanzee Genome SequencingHIGH
- National Human Genome Research InstituteHIGH
Example 3 — not enough evidence
There is liquid water on Europa.
Strong indirect evidence — including magnetic field readings from the Galileo spacecraft — suggests a subsurface ocean beneath Europa's ice shell. However, no mission has yet directly confirmed the presence of liquid water. This remains an active area of research.
- NASA Europa Clipper MissionHIGH
- Journal of Geophysical ResearchHIGH
What gets rejected — and why
Not everything can be fact-checked. If your input doesn't fit, you'll see a rejection card explaining why.
How long do dolphins live?
That's a question, not a claim
Rephrase it as a statement: "Dolphins can live up to 50 years."
Pineapple belongs on pizza.
That's an opinion
Opinions cannot be true or false — there is no evidence to check.
Write me a summary of World War 2.
That's not a fact-checkable claim
This is a task, not a statement. Try: "World War 2 ended in 1945."
Checking claims against a document
You can upload a file and check whether a specific claim about it is true or false. The AI reads your document and verifies the claim against what's actually in it — not from general knowledge.
Contracts, reports, research papers. Any PDF with readable text.
Example claim: The contract expires on 31 December 2025.
Spreadsheets and data files. The AI computes totals automatically.
Example claim: Total revenue across all months is $62,375.
Word documents — meeting notes, proposals, agreements.
Example claim: The report recommends expanding the sales team.
Markdown files — documentation, README files, notes.
Example claim: The monthly retainer is $12,500.
How to use file upload:
- 1.Select the matching tab (PDF, CSV, DOCX, or Markdown)
- 2.Drag and drop your file, or click to browse
- 3.Type your claim about the document's contents
- 4.Click "Analyze"
Your file is deleted from our servers immediately after analysis. Nothing is stored.
Example — checking a CSV file
Total units sold across all months exceeds 5,000.
Based on the uploaded data table, the total units sold across all months is 1,935 — well below 5,000. The column summary confirms: Units Sold sum = 1,935.
Understanding the verdict
The claim is supported by credible evidence.
The claim is contradicted by credible evidence.
Credible sources disagree — no clear consensus exists.
There isn't enough reliable evidence to make a determination either way.
What the confidence score means
Tips for better results
Be specific
"Usain Bolt ran the 100m in 9.58 seconds" works better than "Usain Bolt is very fast".
One claim at a time
Check claims separately. "Einstein failed maths and was born in Germany" is two claims.
Use statements, not questions
"The Amazon is the longest river" not "Is the Amazon the longest river?"
For documents, quote exactly
The closer your claim is to what the document actually says, the more precise the result.
Low confidence doesn't mean wrong
A low confidence score means evidence is limited, not that the claim is false.
Ready to try it?
Open the Analyzer →