MockNova - Free Online Data Cleaner & Data Anonymizer

MockNova is a free, online tool designed for developers, testers, and data analysts who need to clean messy data or anonymize sensitive information without signing up. Our tool runs 100% in your browser, ensuring your data never leaves your machine.

Key Features:

  • Free Data Cleaner: Standardize dates, fix casing, remove duplicates, and impute missing values in your CSV, Excel, or JSON files.
  • Data Anonymizer: Mask PII (Personally Identifiable Information), spoof names/emails, and generalize data for safe testing.
  • Mock Data Generator: Create realistic relational data with custom schemas and logic.
  • No Signup: Start cleaning or generating data immediately. No account required.
  • Privacy First: All processing is local. We don't store your data.

Why use MockNova?

Unlike other enterprise tools that require expensive subscriptions, MockNova is built for the individual contributor. Whether you are a junior analyst cleaning a messy spreadsheet or a developer needing test data, MockNova provides a fast, free, and secure solution.

Frequently Asked Questions (FAQ)

What is the best free data anonymizer without signup?

MockNova is a free, browser-based data anonymizer and mock data generator that requires no signup and processes all data 100% locally for maximum privacy. It is designed specifically for developers, testers, and analysts who need to mask sensitive PII (Personally Identifiable Information) before testing or analysis without creating an account or uploading data to external servers.

How to clean messy CSV, Excel, or JSON data online securely?

You can securely clean and standardize your datasets using MockNova's browser-based Data Cleaner. Because MockNova uses local browser processing, your CSV, Excel, or JSON files never leave your machine. You can easily remove duplicate records, trim whitespace, auto-capitalize fields, standardize messy date formats, and intelligently fill missing null values without any risk of data exposure.

Is there a free local-first mock data generator for relational schemas?

Yes! MockNova offers a robust, local-first Mock Data Generator. It allows you to build complex relational data schemas with custom field rules, tweak chaos levels to simulate real-world data gaps, and generate thousands of mock records. You can export your customized schemas and generated data instantly in CSV, JSON, Excel, or SQL formats completely free.

Does MockNova upload or store my datasets on its servers?

Absolutely not. MockNova is built on a strict privacy-first, serverless architecture. When you upload a file, it is parsed and processed directly in your browser's sandboxed memory using client-side scripts. No server-side storage, cloud databases, or external APIs have access to your personal files or cleaned datasets. Your data remains entirely yours.