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FREE MOSS API
Code Plagiarism Detection

The #1 free MOSS plagiarism checker. Detect code similarity across 25+ programming languages with Stanford's trusted MOSS technology. Instant results, powerful API.

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25+
Languages
99.9%
Uptime
<5s
Response
api-example.py
1import requests
2
3# Submit files for plagiarism check
4response = requests.post(
5    "https://api.mosschecker.com/v1/check",
6    headers={"X-API-Key": API_KEY},
7    json={"language": "python"}
8)
Features

Everything you need for plagiarism detection

Built for educators, developers, and organizations who need reliable code similarity detection.

⚡

Lightning Fast

Get results in seconds. Our optimized infrastructure processes checks faster than any alternative.

🔒

Secure & Private

Your code never leaves our secure servers. Enterprise-grade encryption and privacy.

🌐

RESTful API

Simple, well-documented API that integrates with any platform. SDKs available.

📊

Detailed Reports

Comprehensive similarity reports with line-by-line comparisons and percentages.

🎯

Accurate Detection

Stanford's proven MOSS algorithm catches plagiarism even when code is modified.

∞

Unlimited Checks

No per-check fees. Run as many checks as you need with our monthly subscription.

Languages

25+ Programming Languages

From Python to Assembly, we support all major languages.

Python Java C C++ C# JavaScript Ruby Perl PHP Haskell Lisp Scheme Pascal Fortran MATLAB Prolog VHDL Verilog MIPS Visual Basic PL/SQL Modula-2 Ada Spice

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