Withdata DataFileConverter merges TXT files into one CSV file locally — any number of files, mapped column by column, with the output options of your choice. 100% local, secure, and cross-platform.

Why Choose Withdata DataFileConverter as a TXT Merger?

🔒 100% Local & Secure

All merging runs on your own computer. Nothing is uploaded to any cloud server.

⚡ Fast Streaming Merge

Millions of rows within a minute. Large files are streamed with low memory usage.

📁 Any Number of Files

Add two files or a whole folder, then combine everything into a single CSV file.

🔄 Column Mapping

Files with a different column order or extra columns can be mapped to the output columns before merging.

🖥 Windows, macOS, Linux

Native builds for Windows, macOS and Linux, with a step-by-step GUI wizard and a command line interface.

⏱ CLI & Scheduled Tasks

Save a merge session and run it automatically from Windows Task Scheduler or crontab.

Full Feature Comparison

Feature	Supported details
Input	Any number of TXT files, added one by one or as a folder
Output format	Standard CSV, with configurable delimiter, quote character and encoding
Merge mode	All input rows into one output file
Running mode	GUI wizard · command line · scheduled tasks
Column handling	Source columns are mapped to the output columns
Output options	Delimiter, quote character, header row, encoding
Platform	Windows, macOS, Linux (native, 64-bit)

TXT to CSV — What Changes

The existing delimiter is replaced with a comma and the fields are quoted so embedded commas are safe. The source delimiter has to be identified before the export.

All TXT Merge Options You Need

Merge several TXT files into one CSV file — step by step in the GUI wizard
Merge a whole folder of TXT files in one run
Map the columns of each input file to the output columns
Run the merge from the command line, and schedule it as a scheduled task
All TXT tools and all CSV tools
Guide: Merge multiple TXT files into one CSV

Same source format, other targets

This page merges TXT into another format. If you need a different output, these pages each do that one job:

All merge tools, by format

Merging into CSV — Notes

The delimiter and quote character can be chosen; quoted fields and embedded line breaks are parsed correctly.

How to Merge TXT Files (4 Steps)

Open Withdata DataFileConverter and choose Merge (combine multiple files into one).
Add the TXT files you want to merge — two files, a list, or a whole folder.
Check the preview and map the source columns to the output columns; then set the output options (Delimiter, quote character, header row, encoding).
Click Convert — the single CSV file is written in seconds. Save the session if you want to run it again from the command line.