API Payload Size Analyzer
Measure UTF-8 payload size and actual local gzip compression.
CSV Column Extractor
Extract one named CSV column as a JSON array.
Processed locally in your browser.
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How to use CSV Column Extractor
- Choose Example to see valid input, or enter your own data.
- Run the tool and review the result. Invalid inputs show a helpful error.
- Copy or download the output, or use Reset to clear the workspace.
Practical example
name,score Ada,42 Sam,35
Common question
What should I know before using this tool?
The first row contains unique column names. Values remain strings.
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