Free CSV Data Prep & Splitter Tool

Yes. Every output file includes the original header row as its first line, so each part is immediately usable in any platform, database, or spreadsheet tool without manual editing. Column exclusions are applied consistently across all files.

Yes. All processing happens entirely in your browser using client-side JavaScript. Your CSV file is never uploaded to any server, stored, or retained by Pirai AI. It is safe to use with personally identifiable information, health records, and confidential contact lists. The tool is GDPR and HIPAA friendly by design.

The tool supports CSV files up to 500,000 rows. Large files are processed using optimised chunked algorithms to keep your browser responsive throughout the operation. All transformations and splits run client-side with no server involved.

Yes. Choose the By Column Value mode, select any column in your file, and the tool creates one output file per distinct value found in that column. For example, splitting a contact list by Region produces one file per region, each named after the column value.

Upload your CSV, select By Row Count, and set the row limit to 100,000 (the Qualtrics SDS maximum). Click Split and download the ZIP. Each output file will have at most 100,000 data rows plus the header, and is ready to import as a Supplemental Data Source.

Output files are standard CSV files named after the original file with a part number appended, for example myfile_part1.csv, myfile_part2.csv. All parts are packaged into a single ZIP file for easy download. When splitting by column value, each file is named after the column value it contains.

Yes. Step 1 is an optional clean and transform panel. You can trim whitespace from every column globally, apply per-column operations including UPPERCASE, lowercase, Title Case, add prefix or suffix, find and replace, and regex replace. You can also concatenate two or more columns into a new field, or add a static value column. All changes are previewed on the first 5 rows before you commit.

Select the Sample Rows mode and choose either a percentage (1-100%) or an exact row count. With the Randomise before sampling toggle on (default), rows are shuffled using a partial Fisher-Yates algorithm before the sample is taken, ensuring a genuinely random cross-section of your data rather than just the first N rows.

Yes. The Columns in output picker appears in the clean panel as soon as you have transforms configured. Every column is shown as a checkbox pill. Uncheck any column to exclude it from all output files. New columns created by concatenate or static value transforms are shown with a NEW badge and can also be excluded if needed.

They solve different problems. The CSV Compare tool takes two CSV files and shows you what changed between them: missing records, new records, field-level changes, and duplicates. It is designed for auditing and validation. This CSV Data Prep & Splitter tool takes one CSV file and lets you clean it, reshape its fields, sample rows, and split it into output files ready for import. A common workflow is to use this tool to clean and split a contact list, then use CSV Compare to verify the split files together match the original.

This tool prepares your data file. If you need to convert a survey document into a platform-ready format, Pirai AI converts Word, PDF, and Excel questionnaires directly into import-ready files for Google Forms, Qualtrics, REDCap, SurveyMonkey, and 25+ other platforms. It is a separate workflow from data file preparation.