Online Text File Merger

Merge TXT, CSV, Markdown (.md), and any other plain text files instantly in your browser — no upload, no waiting.

How to Use
Recommended Related Tools
CSV Splitter
Free, browser-based tool for splitting giant CSV files
Text Splitter
No installation required — an online text file splitting tool that runs entirely in your browser
CSV to Excel
Easily batch convert your CSV files to Excel.
Excel to CSV
Convert Excel to CSV – Supports multiple files and sheets
Duplicate Remover
Remove, extract, and count duplicate lines from text or CSV data. Create clean, unique lists instantly.
Bulk Renamer
Rename multiple files at once — add dates, numbers, or replace text.

Merge multiple text files quickly — right in your browser

Combine multiple text files (.txt), log files, and CSVs into a single document — right in your browser. No data is uploaded to a server, so processing stays fast and private. Works well even with large files.

How to Merge Files
STEP1

Upload Files

Drag and drop or select the files you want to merge.

Supports .txt, .csv, .log, .tsv, and other plain text formats.

Maximum total file size is 2GB.

Upload multiple files
STEP2

Exclude Headers (for CSV files)

If your CSV files have header rows, enable "Exclude headers from 2nd file onwards" to keep only the first file's header.

This prevents duplicate headers from appearing in the merged output.

Check whether to exclude headers from the second file onwards
STEP3

Download

Confirm the file order, then click the Merge button.

The merged file is generated instantly on your device and downloaded right away.

Click the download button
Features and Specifications

Free and no registration required

Supports any plain text format — CSV, TXT, LOG, TSV, and more

Maximum total file size: 2GB

All processing runs locally in your browser — files are never sent to a server

Binary formats like PDF, Word, or Excel are not supported

Ideal For

Data analysts combining CSV exports

Developers merging log or config files

Writers putting together Markdown or plain text documents

Anyone who needs to merge .txt, .log, .tsv, or similar files without extra software

Frequently Asked Questions
Can I merge text files online for free?
Yes. This tool is completely free — no signup or installation needed.
Does this support formats other than CSV and TXT?
Yes. Any plain text file works, including .log, .tsv, .json, .xml, .md, and more — as long as it's not a binary file.
Can I merge CSV files without duplicating the header row?
Yes. Enable the "Exclude headers from 2nd file onwards" option and the tool will automatically strip headers from all files except the first.
Are my files uploaded to a server?
No. Everything is processed locally in your browser. Your files are never sent anywhere.
Do I need to install anything?
No. The tool runs entirely in your browser — no software or plugins required.
What formats are not supported?
Binary formats such as .pdf, .docx, and .xlsx are not supported.
Why use this tool?

Because everything runs in your browser, there's no upload time — files are merged almost instantly, even with large datasets. No command line, no software to install, and no worrying about file limits. Just open the page and start merging.

Start merging your files now.

Related Tools
CSV Split Tool
Free, browser-based tool for splitting giant CSV files
Text File Splitter
No installation required — an online text file splitting tool that runs entirely in your browser
Batch Convert CSV to Excel
Easily batch convert your CSV files to Excel.
Online Excel to CSV Converter
Convert Excel to CSV – Supports multiple files and sheets
Remove Duplicate Lines Online
Remove, extract, and count duplicate lines from text or CSV data. Create clean, unique lists instantly.
Batch File Renamer Online
Rename multiple files at once — add dates, numbers, or replace text.