Parse The Data
Local only

Dataset compare and join

Compare records. Join with intent.

Compare and join workspace

Worker ready

Source 01

Baseline

Source 02

Updated

Record identity

Key mapping

Load a baseline and updated dataset to begin.

Practical guide

Compare without losing the reason for each change.

  1. 01 / Load

    Choose both sources.

    Use equivalent snapshots and confirm the detected rows and columns.

  2. 02 / Identify

    Map stable keys.

    Prefer durable IDs and add a second key only when identity requires it.

  3. 03 / Review

    Inspect differences.

    Review changed values and resolve every missing or duplicate key.

  4. 04 / Join

    Build controlled output.

    Choose coverage, set suffixes, review counts, and export locally.

How does Parse The Data decide whether a record changed?

You map one or two key columns that identify a record. Records with the same key are compared field by field; type and value differences are reported explicitly.

What happens when a key is missing or duplicated?

The affected records are excluded from comparison and join output and listed as key conflicts. The tool never chooses a duplicate record silently.

Are joined files uploaded?

No. Both sources, comparison results, join preparation, and export remain inside the browser tab and run through a local Web Worker.

Designed for restraint

The server delivers the tools. Your dataset stays in the browser.

The app files arrive first. Parsing, profiling, and cleanup then happen in a browser worker on your device. The dataset has no upload path.

  • No accounts
  • No cloud storage
  • No third-party scripts

Use the PII scan as an early warning—not as legal advice or a compliance certification.