Fast, private CSV tools
Work with CSV files
entirely in your browser
Fast browser-based CSV tools for splitting, merging, viewing, cleaning and converting files. Your file contents stay on your device and no sign-up is required.
Upload a file to get started, or choose a tool below.
Choose your file
Select the appropriate tool, then choose the CSV file you want to work with.
Process instantly
Everything runs in your browser. No servers, no waiting.
Download the result
Get your converted or cleaned file with a single click.
Choose a CSV tool
A collection of fast, privacy-focused CSV utilities that run entirely in your browser.
All tools run locally in your browser — your files are never uploaded.
Split CSV
Break large CSV files into smaller files instantly. Split by row count, file count, file size, or column values.
Split CSV FilesMerge CSV
Combine multiple CSV files into a single file quickly. Columns are matched automatically across files.
Merge CSV FilesView CSV
Open and explore CSV files directly in your browser. Search, sort, and filter your data instantly.
View CSV FilesCSV to JSON
Convert CSV data into structured JSON format. Preview the output and download with one click.
Convert CSV to JSONJSON to CSV
Transform JSON datasets into CSV format. Keys become column headers automatically.
Convert JSON to CSVRemove Duplicates
Remove duplicate rows from CSV files directly in your browser. Clean datasets instantly with no uploads.
Remove Duplicate RowsExtract Columns
Choose specific columns from a CSV file and download a filtered version instantly. No uploads required.
Extract CSV ColumnsChange Delimiter
Convert CSV files between comma, semicolon, tab, and pipe separators instantly. No uploads required.
Change CSV DelimiterLocal processing
The tool reads and processes your file in the browser rather than uploading it to our server.
No upload wait
Start working as soon as the browser has read your file, without transferring it first.
No installation
Use the tools in a modern browser without installing desktop software or creating an account.
Useful for everyday data jobs
Pick one tool for a quick task, or use several to prepare a file for its next system.
Prepare a system import
Remove duplicate contacts, keep only the required columns, and change the delimiter to match an import template.
Tidy monthly reporting
Combine exports from several periods into one file, or split a large report into manageable parts.
Check unfamiliar data
Inspect a supplier or analytics export before opening it in a spreadsheet, then convert it if another format is required.
Not sure how CSV files work?
Read the practical CSV file guide for plain-language help with headers, delimiters, quoted values, character encoding and common spreadsheet problems.