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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!
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.
Perfectly handle TXT, CSV, LOG, XML, JSON and other text-based files. Preserve original encoding and format structure after splitting.
Process GB-level large text files without memory limits. Optimized algorithm ensures fast splitting speed even for 10GB+ files.
Works on Windows, Mac, and Linux. All processing happens locally - no file uploads, 100% data privacy and security guaranteed.
Choose the large text file (TXT/CSV/LOG) you want to split, support drag & drop
Choose split mode (by lines/size/keywords/into N files) and set output path
Click start button, get split files in seconds with real-time progress
A text file splitter breaks one oversized file into smaller files you can actually open, upload or process. These are the jobs people bring to it - a 4 GB CSV that Excel refuses, a file over an upload cap, a 20 GB log nobody can open, and a JSONL export that has to be sharded. BigTextFileSplitter does that on Windows, Mac and Linux, without uploading anything.
Split by line count so every part fits the spreadsheet's row limit, and know what happens to the header row.
Split by size to fit an email, platform or API limit - and get the parts back into one file afterwards.
Divide a huge log by size, or by a keyword such as a date marker, then search the part you need.
Split JSON Lines between records, so each output is still valid JSONL any parser can read.
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.
No. The software only reads the original file and creates new split files - the original file remains completely intact and unmodified.
Yes. You can use command line to split files for automation and batch processing.
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.
Yes. All purchases include free technical support via email.
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.
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.
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.
TXT, CSV, TSV, LOG, JSON, JSONL / NDJSON / LDJSON, XML and any other text-based file. Every split can also be run from the command line, so the same job can be put on a schedule or applied to a whole folder - see batch splitting and scheduled tasks.