Large File Splitter: How to Split Large Files Easily with This Free C# Tool (CSV, TXT & More!)

Are you struggling to open a massive CSV file in Excel? Is your text editor freezing when you try to view a gigantic log file? You're not alone. Large files can be a nightmare to work with, especially when they're too big for your software to handle.

That’s where our free Large File Splitter tool comes in.

Built with C# and powered by the .NET Framework, this lightweight, ultra-fast utility helps you split large text files into smaller, manageable chunks, in seconds. And yes, it works perfectly with CSV, TXT, LOG, and other plain-text file formats.

Real-World Use Cases

• Import large CSVs into Excel (which caps at ~1M rows)
• Process logs faster by splitting them across multiple threads or machines
• Speed up data analysis in tools like Power BI, Pandas, or R
• Debug giant output files from applications or APIs
• Prepare datasets for batch processing or cloud uploads

What Can You Split?

This tool is designed for any line-based text file, including:

• .csv – Comma-separated values (perfect for Excel, databases, or data analysis)
• .txt – Plain text files
• .log – Application, server, or system log files
• .json – Line-delimited JSON (common in logging and data pipelines)
• .tsv – Tab-separated values
• .xml – If each line is a record (though caution advised with multi-line tags)

As long as your file is text-based and line-delimited, this splitter can handle it.

Why Use This File Splitter?

Here’s why developers, data analysts, and IT pros love this tool:

✅ Blazing Fast Performance
Split a 1 GB CSV file in under 60 seconds.
Benchmark:

• 300 MB → 4.3 sec
• 600 MB → 8.6 sec
• 1 GB → 61 sec

✅ Preserves Headers Automatically
When splitting CSVs, the first line (column headers) is automatically added to every new file. No more missing headers in your data exports!

✅ Safe & Non-Destructive
Your original file stays untouched. No deletions, no modifications, just clean, new split files.

✅ Flexible & Easy to Use
Choose how many files you want (e.g., split into 5, 10, or 50 parts).
Works interactively or via command line arguments, perfect for automation.

✅ Lightweight & Portable
Only 11 KB download. No installation. Just run it.

✅ Smart Filename Handling
New files are named like 0-original.csv, 1-original.csv, etc., using the same case you provide. (Thanks to .NET’s FileInfo logic.)

How It Works (Under the Hood)

Written in clean, efficient C#, this console app reads your large file line by line, minimizing memory usage, and distributes the rows evenly across the number of output files you specify.

It’s smart enough to:

• Validate file paths
• Handle missing files with clear error messages
• Default to 2 splits if invalid numbers are entered
• Skip processing if the source file is empty

And because it’s built on .NET Framework 4.5, it runs on almost any Windows machine.

How to Use It

Option 1: Run Interactively

Double-click the app → Enter your file path → Enter number of splits → Done!

Option 2: Command Line (Great for Scripts)

bash1LargeFileSplitter.exe "C:\Data\huge-file.csv" 5

Splits huge-file.csv into 5 smaller files—ready for Excel, Python, or SQL imports.

Pro Tip: Always use double quotes around file paths with spaces!

Get It Now

Download the Large File Splitter (11 KB) today and stop wrestling with oversized files. Whether you're a data engineer, developer, or analyst, this tool will save you time and frustration.

Split smarter. Work faster. Code in C#, run like lightning.

Built with performance in mind. Tested on real-world datasets. 100% free. 0% bloat.

GitHub - philoushka/LargeFileSplitter: You have a large file (CSV, txt,etc). Let’s split its contents into multiple files.

You have a large file (CSV, txt,etc). Let’s split its contents into multiple files. - philoushka/LargeFileSplitter

GitHubphiloushka