Free Online CSV Tools
View, edit, convert, clean and analyze CSV files directly in your browser. Fast, private and no signup required.
Drop your CSV file here to view instantly
Private in-browser parsing. Zero server uploads.
CSV Tool Directory
Select a utility below to view, convert, clean, or transform your data.
View & Edit
2Convert
9CSV to JSON
Convert CSV data into formatted JSON objects or nested array structures.
JSON to CSV
Convert JSON array objects into CSV tables with customizable delimiters.
CSV to Excel
Convert CSV files into Microsoft Excel spreadsheets (.xlsx format).
Excel to CSV
Extract worksheets from Excel files (.xlsx, .xls) and convert them to CSV.
CSV to TSV
Convert comma-separated CSV files into tab-separated TSV files.
TSV to CSV
Convert tab-separated TSV data into standard comma-separated CSV format.
CSV to Markdown
Generate Markdown tables from CSV data for GitHub, Notion, or documentation.
CSV to HTML Table
Convert CSV data into semantic HTML <table> markup for web development.
CSV to SQL
Generate SQL INSERT statements or CREATE TABLE statements from CSV files.
Clean CSV
4Remove Duplicates from CSV
Find and remove duplicate rows from CSV files based on specific columns.
Remove Empty Rows
Delete blank rows and whitespace-only lines from CSV datasets.
Trim CSV Whitespace
Trim leading and trailing spaces from CSV cell values.
Find and Replace CSV
Search for text patterns and replace values across all or selected columns.
Transform CSV
5Sort CSV
Sort CSV rows alphabetically, numerically, or by date by any column.
Filter CSV
Filter CSV rows based on custom conditions, keywords, or numeric ranges.
Merge CSV Files
Combine multiple CSV files into one unified master dataset.
Split CSV
Divide large CSV files into smaller files by row count or file count.
Select CSV Columns
Extract, reorder, or delete specific columns from CSV files.
Your Files Stay Private
OnlineCSV runs entirely inside your web browser. Your CSV files are processed locally and are never uploaded to any remote server.
Lightning Fast Engine
Engineered with high-performance virtualized tables and streaming web workers. Open datasets with 100,000+ rows without freezing your UI.
No Signup Required
Enjoy instant access to all converters, clean tools, validators, and row counters without login barriers, accounts, or rate limits.
Frequently Asked Questions
What is OnlineCSV?
OnlineCSV is a free collection of browser-based CSV utilities that allow you to view, edit, convert, sort, filter, merge, split, and validate CSV files directly in your web browser.
Are my CSV files uploaded to a server?
No. OnlineCSV's core file tools process your CSV locally inside your browser using JavaScript. The file content does not need to be uploaded to our server for processing.
Can I open a CSV file without Microsoft Excel?
Yes! You can open, view, search, and edit any CSV file instantly using our free CSV Viewer or CSV Editor directly in Chrome, Firefox, Safari, or Edge.
Can OnlineCSV handle large CSV files?
Yes. OnlineCSV utilizes virtualized rendering that only renders DOM elements for rows currently visible on your screen, allowing files with tens of thousands of rows to run smoothly.