Local-first · Free to use

Understand how your data connects.

Compare complete datasets, find quality issues, and design safer joins—without uploading your files to a server.

Analyze your data See how it works
✓ Every row analyzed✓ Files stay in your browser✓ No account required
Relationship preview98% match
SALES.CSVCustomer IDC-10482
One-to-one
CUSTOMERS.XLSXCustomer_IDC-10482

Recommended: safe direct join

01
Add your sources

Choose files or connect to an HTTPS data API.

02
Analyze every row

Profile fields, values, duplicates, and quality issues.

03
Use the results

Review safer joins and export mappings as CSV or JSON.

Data workspace

Compare your datasources

Add at least two sources. All processing happens locally in this browser.

Private by design

Complete workflow

From unfamiliar files to confident analysis

JoinCraft makes data relationships understandable—even if you are not a data engineer.

  • Spot missing and duplicate values
  • Understand how columns relate
  • Prepare cleaner data for Excel, Power BI, Tableau, SQL, or Python

Created by Maheswara Rao Poliparthi
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Six-step JoinCraft walkthrough showing file upload, full-row analysis, quality checks, relationship discovery, and exports JoinCraft walkthrough first step: start by identifying columns that may represent the same data