CSV Splitter Tool

Split a CSV File
Into Smaller Files

Upload any CSV, choose how many rows per file, and download your split files instantly — right in your browser.

Upload a CSV file or drag and drop it here

Processed entirely in your browser

Your split files

    Files are processed entirely in your browser and are never uploaded to any server.

    How it works

    Split a CSV file in three steps

    No accounts, no software to install, no files ever leaving your device. The entire process runs directly in your browser using the native File API.

    Upload your CSV

    Click to browse or drag and drop your CSV file into the upload area. Files stay on your device.

    Set your row count

    Enter how many data rows you want in each output file. The header row is automatically included in every part.

    Download your files

    Click Split File, then download each part individually — or grab them all with one click.

    Why use this tool

    Fast, private, and simple by design

    Most online CSV tools are cluttered with ads, require sign-ups, or quietly upload your data to a server. This one doesn't.

    100% Private

    Your data never leaves your browser. No uploads, no cloud storage, no logs.

    Instant Results

    Processing happens locally at full browser speed. Even large files split in seconds.

    Headers Preserved

    Every output file automatically includes the original column header row.

    Completely Free

    No account required. No file size limits enforced by a paywall. Just the tool.

    FAQ

    Frequently asked questions

    Upload your CSV file using the tool above, enter the number of rows you want in each output file, then click "Split File." The tool will generate individual CSV files which you can download directly from the results section. Each file will include the original header row plus its chunk of data rows.
    Yes — completely free. There are no subscription plans, no file size paywalls, and no sign-up required. The tool runs entirely in your browser with no backend costs, which is why it can be offered for free without limitations.
    No. Your files never leave your device. All processing is handled locally using JavaScript in your browser via the Web File API. Nothing is sent to any server, and there are no logs of your file or its contents. This makes the tool safe to use with sensitive or confidential data.
    Yes. The tool assumes your CSV file has a header row and automatically includes it at the top of every output file. This means each split file is immediately usable in Excel, Google Sheets, or any data tool without needing to manually add the header back.
    Yes. The tool processes files in-browser and handles most typical CSV file sizes well. Very large files may take a moment depending on your device's memory and CPU, but there is no server-side size limit. For extremely large files, using a larger row count per part will reduce the number of output files and improve performance.
    Output files are named based on your original filename. For example, if you upload customers.csv and split it into 3 parts, the output files will be named customers-part-1.csv, customers-part-2.csv, and customers-part-3.csv.