CSV Header Extractor
Extract the header row of a CSV to see its columns.
Just the column names
The first row of a CSV usually names its columns, and seeing just those names reveals the structure of the data. This extracts the header row from a CSV, in your browser, so you can quickly see what fields a file contains.
Load a CSV to extract its header row.
Knowing what's in a file
Pulling out the header is a fast way to understand a CSV without opening the whole thing, which matters when files are large or numerous. The column names tell you what fields the data holds, which is the first thing you need to know before working with it — what is available to filter, extract or analyse. This is especially handy when dealing with an unfamiliar export, checking whether a file has the columns a process expects, or documenting the structure of a dataset. It also helps when combining files, since you can confirm their headers match before merging. A CSV's real content might be thousands of rows, but its structure is entirely captured in that one header line, so extracting it gives you the map you need to work with the data efficiently. Doing it in the browser keeps even a sensitive file local, revealing only its structure without uploading its contents.
Common questions
What does extracting the header show?
The column names — what fields the data holds — which is the first thing to know before filtering, extracting or analysing a CSV.
When is it useful?
Understanding an unfamiliar export, checking a file has the expected columns, documenting a structure, or confirming headers match before merging files.
Is my data uploaded?
No. The extraction happens in your browser, so the data stays on your device.