Big Text File Splitter
Split Large Files in Seconds

Easily split large text files (TXT/CSV/LOG/JSONL) by lines, size, keywords, or into N files. Fast local processing with no file size limits, compatible with Windows, Mac, and Linux - handle even GB-level files effortlessly!

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                        Blazing Fast
                    

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                        Local Processing
                    

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                        Cross-Platform
                    

Download Free Trial Buy Now $59.95 or less

Powerful Text File Splitting Features

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Multiple Split Modes

Split files by line count, file size (KB/MB/GB), specific keywords/strings, or into a fixed number of files (N files, evenly by size or by lines). Customize split rules to match your exact needs.

By Lines By Size Into N Files By Keywords

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Support All Text Formats

Perfectly handle TXT, CSV, LOG, XML, JSON and other text-based files. Preserve original encoding and format structure after splitting.

TXT/CSV LOG Files Encoding Preserved

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Unlimited File Size

Process GB-level large text files without memory limits. Optimized algorithm ensures fast splitting speed even for 10GB+ files.

10GB+ Support Fast Algorithm No Memory Limits

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Cross-Platform & Secure

Works on Windows, Mac, and Linux. All processing happens locally - no file uploads, 100% data privacy and security guaranteed.

Windows/Mac/Linux Local Processing 100% Secure

3 Simple Steps to Split Large Text Files

Select Input File

Choose the large text file (TXT/CSV/LOG) you want to split, support drag & drop

Set Split Parameters

Choose split mode (by lines/size/keywords/into N files) and set output path

Start Splitting

Click start button, get split files in seconds with real-time progress

Text File Splitter for Windows, Mac and Linux

A text file splitter breaks one oversized file into smaller files that you can actually open, upload or process: a 20 GB log you have to search, a CSV that is too large for Excel, a JSONL export that hits an upload limit, or a text book that has to be divided into chapters. BigTextFileSplitter does that on Windows, Mac and Linux, without uploading anything.

Split a large file into smaller files

Choose how the output is divided: by line count, by file size (KB/MB/GB), by a keyword or separator, or into a fixed number of files (N files), evenly by size or by lines. The original file is never modified and the encoding is preserved, so nothing is re-encoded or lost. See splitting a large CSV into smaller files or splitting a large log file.

Online text file splitter, or a desktop one?

A browser splitter is handy for a small file, but uploads are usually capped at a few hundred MB, and a multi-gigabyte log has to be sent somewhere first. BigTextFileSplitter reads the file where it is: no upload, no practical size limit, and the same split can be repeated from the command line or on a schedule. The same jobs are also available as online tools if you prefer the browser: split CSV, split TXT, split LOG, split JSON and split XML.

Split a large CSV into a fixed number of files with BigTextFileSplitter

Split from the command line

Every split can be scripted. The command line makes it easy to split the same file on a schedule, or to process a whole folder in one batch - see batch splitting big text files.

Which formats can be split?

TXT, CSV, TSV, LOG, JSON, JSONL / NDJSON / LDJSON, XML and any other text-based file. JSON Lines files are split record by record, so every output file stays valid - see splitting JSONL / NDJSON. For structured JSON or XML by field value use DataFileSplitter, and to convert between formats use DataFileConverter.

Frequently Asked Questions

What is the maximum file size supported? +

There is no theoretical maximum file size limit. The software can handle any size of text files, including 10GB, 50GB or even larger files, as long as your hard disk has enough free space for the output files.

Will splitting damage the original file? +

No. The software only reads the original file and creates new split files - the original file remains completely intact and unmodified.

Does it support command line operation? +

Yes. You can use command line to split files for automation and batch processing.

Can I split a file into a specific number of files? +

Yes. Besides splitting by line count or file size, you can split a file into a fixed number of output files (N files) - either of roughly equal size, or with a balanced number of lines per file.

Is technical support included after purchase? +

Yes. All purchases include free technical support via email.

What is a text file splitter? +

A text file splitter is a tool that divides one large text file into several smaller files. You choose the rule - a number of lines, a file size, a keyword, or a fixed number of output files - and the tool writes the parts. BigTextFileSplitter does it for TXT, CSV, LOG, JSON, JSONL and XML files without loading the whole file into memory.

How do I split a large text file into smaller files? +

Open the file, choose the split mode (by lines, by size, by keyword, or into N files), set the output folder and click start. The original file is left untouched, and multi-gigabyte files are processed in a stream, so no more memory is used than for a small file.

Can I split a text file online? +

Yes, for small files: the matching tasks are available as online tools (split CSV, TXT, LOG, JSON or XML). For large files a desktop tool is faster and safer, because nothing is uploaded and there is no size limit.

Big Text File SplitterSplit Large Files in Seconds