ch-fixedwidth · Fixed width to CSV

Companies House bulk converter

Convert fixed-width bulk files (.dat) into tabular CSV — officers snapshot and update, disqualified persons, and liquidation daily updates. Processing runs entirely on this machine; nothing is uploaded.

Get data: Companies Catalogue or Companies House SFTP.

Step 1

Input file

No file selected
Drop .dat file Companies House bulk .dat file, or press to browse

Step 2

Output folder

Not chosen

Step 3

Convert to CSV

Ready.

Supported file formats

Identified by the first eight characters of the file. Product numbers are Companies House bulk product codes.

For large files, the native command-line tool is about ten times faster than this browser converter.