Data Sampler

Random sample from CSV or JSON data. Set size or percentage, use a seed for reproducibility, preview and download. All in your browser.

About Data Sampler

Extract a representative random sample from your CSV or JSON datasets. Set a fixed row count or a percentage, use a random seed for reproducible sampling, and preview the results before downloading.

Free & Unlimited

Sample any size dataset at no cost. No row limits, no hidden charges, no account needed.

100% Private

All sampling happens locally in your browser. Your data never touches any server.

Reproducible Sampling

Set a random seed to generate the same sample every time. Perfect for sharing sampling methodology.

CSV & JSON Support

Works with both CSV (auto-detected delimiter) and JSON arrays. Preview as table or raw text.

📋 Common Use Cases

Pre-Analysis Data Prep

Clean CSV and spreadsheet data before analysis. Standardize formats, remove duplicates, and fix inconsistent values that would skew results.

PII Redaction

Remove or mask personally identifiable information before sharing datasets with third parties or publishing open data. Comply with privacy regulations.

Text File Parsing

Convert unstructured text files into organized columns. Extract structured data from logs, reports, or exported text dumps.

Database Cleanup

Prepare data for database import by fixing malformed records, standardizing field formats, and removing invalid characters.

🪜 How to Use This Tool

  1. Load your data
    Paste raw text or upload a file. The tool auto-detects delimiters and structure in CSV, TSV, and fixed-width formats.
  2. Choose cleaning operations
    Select what to do — remove duplicates, trim whitespace, anonymize PII, split columns, or standardize formats.
  3. Preview changes
    Review a before/after comparison of your data. Adjust cleaning rules if needed before applying to the full dataset.
  4. Download cleaned data
    Export as CSV, JSON, or copy to clipboard. Original data is never uploaded — all cleaning happens locally.

📚 Related Guides

Frequently Asked Questions

Is this data tool free?▼
Yes. All data tools are completely free. No signup needed.
Is my data sent to a server?▼
No. All data processing happens in your browser. Your JSON, CSV, SQL, and text data never leaves your device.
Can these handle large files?▼
JSON formatter and CSV tools comfortably handle files up to ~10MB in browser. Performance depends on your device for larger datasets.