Standalone CSV schema worksheet · exact mappings only

Compare two CSV schemas. Confirm every column mapping.

Paste a source and target sample. This page parses them inside this browser, preserves duplicate headings by position, and never treats a suggested match as approved.

No server upload. CSV text and mapping data stay in this page. Optional aggregate measurement loads only after explicit allow and may send only the event names tool_start and tool_complete without payload fields; the provider receives ordinary connection metadata such as IP address and browser headers and may set cookies. Do not paste secrets. Closing or resetting the page clears the working state.

Step 1

Paste two small samples

Maximum 1,000,000 characters per side. The first logical record is treated as the header.

Source CSV Source delimiter

Target CSV Target delimiter

Step 2

Review structure and uncertainty

Value “shapes” are lexical observations from the pasted rows, not declared data types.

Heading-count differences

Step 3

Choose and explicitly confirm mappings

Only unique, exact normalized headings are preselected. Similar meaning is never guessed.

Source column	Target column	Decision	State

What this result does not claim

No semantic or fuzzy match is performed.
No rows are transformed, merged, validated, or uploaded.
Same observed lexical shape does not prove compatible business meaning, units, null rules, keys, or data quality.
Ambiguous delimiter detection and malformed or uneven records remain visible for manual resolution.

Scope

Rules and evidence checked 2026-09-27