CSV Column Mapper
Rename CSV headers using simple source:target mapping rules.
What this tool does
Map old CSV column names to new headers before importing into another system.
Tool interface
Input
Output
Example input
name:full_name,email:email_address name,email,city Ana,ana@example.com,Melbourne
Example output
full_name,email_address,city Ana,ana@example.com,Melbourne
Step-by-step instructions
- Add mapping rules at the top using source:target format, separated by commas or new lines.
- Leave one blank line after mapping rules, then paste CSV data.
- Click Transform to generate CSV with renamed headers.
Common use cases
- Preparing CSV exports for reliable imports into other systems.
- Fixing spreadsheet data before reporting or analysis.
- Converting CSV records into JSON, SQL, or other formats.
Helps match target-system schema requirements when importing CSV files from different sources.
Common mistakes to avoid
- Using data without checking whether the header row matches expected column names.
- Skipping validation before import, which can hide row-width or delimiter issues.
- Converting files before cleaning duplicate or malformed records.
Frequently Asked Questions
What format should mapping rules use?
Use source:target, for example name:full_name.
Do unmapped headers stay the same?
Yes. Only mapped headers are renamed.
What input format does CSV Column Mapper expect?
Use CSV-like tabular input, typically with a header row first.
What does CSV Column Mapper output?
It returns transformed output you can copy or download as `mapped.csv`.
Why might CSV Column Mapper return an error?
Most failures come from malformed input that does not match the expected format.
Does CSV Column Mapper run in the browser?
Yes. Transformations are designed for in-browser usage so you can test and iterate quickly.
Can I copy or download results from CSV Column Mapper?
Yes. You can copy the result or use the download action when file output is available.
Related tools
Related guides
Browse all DataToolbox guides for more workflows.
Related categories
Looking for other utilities in this area? CSV Tools