CSV splitter — break large files into parts
Split a big CSV into smaller files by row count. Headers are preserved in every part, and the file never leaves your browser.
Click to upload or drag and drop
Drop your CSV, Excel, or JSON file
Max 10MB
Runs 100% in your browser — this page makes no network request with your data.
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Drop your CSV file and choose how many rows each part should contain.
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Download the parts you need — every part keeps the header row.
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Or skip the splitting entirely: the workspace analyzes large files directly.
Worked example: splitting a 40,000-row export
An operations manager pulls a 40,000-row customer list out of the company ERP and needs to load it into an email platform that caps each import at 5,000 rows. Rather than copy-paste blocks in a spreadsheet, they drop the CSV onto the splitter and set 5,000 rows per part.
The tool produces eight downloadable files, and every part begins with the original header row, so each one imports cleanly on its own without manually re-adding column names. Because the split runs in the browser, the customer records never leave the manager's machine, which matters for a list full of names and email addresses.
If the real goal is analysis rather than a size-limited upload, the manager can skip splitting altogether: clicking through to the workspace analyzes the full 40,000 rows at once, then turns the result into a shareable report with charts of customers by region or signup month.
Frequently Asked Questions
Everything you need to know about using AnalyzeData.
Usually to fit an upload limit — many tools cap imports at 1,000–10,000 rows — or to distribute a large export across teams. Each generated part is a valid standalone CSV with headers.
Yes — every part starts with the original header row, so each file imports cleanly anywhere.
No. Parsing and splitting run in your browser; download links are generated locally from memory.
Set the rows-per-part value to your destination's cap; for example, 2,000 for a tool that limits imports to 2,000 rows, then download the parts. Each part is a complete, valid CSV with the header row included, so it imports cleanly on its own. The whole split happens in your browser, so a large or sensitive export never gets uploaded.
Yes. You do not need a spreadsheet macro, a pandas script, or a terminal command; drop the file in, choose a row count, and download the parts. It runs client-side in the browser, so it handles files too big to comfortably open in Excel, and nothing about your data is transmitted while it splits.
When a table isn't enough
The workspace runs verified AI analysis on the same file and turns the results into a report you can send.
Analyze this data instead