Split CSV File

Easily split a large CSV file into smaller, more manageable parts directly in your browser. Choose to divide your CSV by a fixed number of rows per file or into a set number of equal parts. Keep the header row in every output file, preview each segment before downloading, and export all parts instantly, with no upload to any server.

After uploading, the file content will appear in the text area above.
Files will be named: prefix_1.csv, prefix_2.csv, ...
All processing runs entirely in your browser. No data is sent to any server.

⭐ What is the Split CSV File tool?

The Split CSV File tool lets you divide any large CSV file into smaller, more manageable pieces, all inside your browser, without uploading your data to a server. Whether you need to work around file-size upload limits, batch-process data in chunks, or distribute parts of a dataset to different team members, this tool gets it done in seconds.

⚙️ How to use it

  1. Paste your CSV data into the text area, or click Upload a CSV file to load a file from your computer.
  2. Choose a split method: split by a fixed number of rows per file, or split into a set number of equal parts.
  3. Set optional preferences: delimiter, header repetition, empty-line handling, whitespace trimming, and a filename prefix.
  4. Click Split CSV.
  5. Preview each output segment and click Download .csv next to any part to save it.

🔎 Split methods explained

Rows per file

Every output file will contain exactly the number of data rows you specify (plus the header if enabled). The last file may contain fewer rows if the total does not divide evenly. Example: 350 rows split at 100 rows per file produces four files: three with 100 rows and one with 50.

Equal parts

The tool divides all data rows into the number of parts you specify, distributing them as evenly as possible. Example: 350 rows into 4 parts gives three files with 88 rows and one with 86.

⚙️ Options reference

  • Repeat header row in each file: The first row of your CSV is treated as a header and added to the top of every output file. Disable this for headerless datasets.
  • Ignore empty lines: Blank rows are skipped before splitting so they do not inflate file counts.
  • Trim whitespace per cell: Leading and trailing spaces are removed from every cell value.
  • Delimiter: Auto-detect works for most files, but you can manually select comma, semicolon, tab, or pipe if needed.
  • Output filename prefix: Give your files a meaningful name. The tool appends _1, _2, … to the prefix automatically.

💡 Practical use cases

  • Breaking large exports (CRM, e-commerce, analytics) into uploadable chunks for platforms with row-count or file-size limits.
  • Distributing portions of a dataset among team members or scripts for parallel processing.
  • Creating test and staging datasets from production data exports.
  • Preparing CSV batches for bulk-import APIs that restrict the number of records per request.

⚠️ Privacy & security

All processing happens entirely client-side in your browser using JavaScript. Your CSV data is never uploaded to any server. You can use this tool with confidence even for sensitive business data.

Frequently Asked Questions

It divides a large CSV file into multiple smaller CSV files based on your chosen split method, either a fixed number of rows per file or a set number of equal parts. All processing happens in your browser.

No. All splitting is performed entirely client-side using JavaScript. Your data never leaves your browser, making this tool safe to use with sensitive or proprietary datasets.

You can split by rows per file (e.g. every 100 rows) or into a fixed number of equal parts (e.g. 5 equal files). Both methods are available in the Split method dropdown.

Yes. Enable the "Repeat header row in each file" option and the tool will automatically add the first row of your CSV to the top of every output segment.

The tool supports comma, semicolon, tab, and pipe as delimiters. Select "Auto-detect" to let the tool choose the correct delimiter based on the first line of your data.

The tool handles large CSV files efficiently because it processes everything in the browser. Practical limits depend on your device's available memory. Files up to several hundred megabytes typically work without issues on modern computers.

Yes. After clicking Split CSV, a preview card appears for each output segment showing the first 10 rows. You can inspect each part before deciding to download it.

Empty lines are excluded from the data before splitting. This prevents blank rows from counting toward a file's row limit or inflating part sizes.

Yes. Enter a filename prefix in the "Output filename prefix" field. The tool appends _1, _2, _3, … to produce names like data_1.csv, data_2.csv, and so on.

When splitting by rows, the last file receives the remaining rows which may be fewer than the specified row count. When splitting into equal parts, the tool distributes rows as evenly as possible using ceiling division, so some parts may have one more row than others.

Yes. The CSV parser correctly handles RFC 4180-style quoted fields, including fields that contain the delimiter character, newlines, or escaped double-quotes.

Yes, the tool is built with Bootstrap and works in modern mobile browsers. File upload and download are supported on most iOS and Android browsers.