CSV Editor Online
Edit CSV in a spreadsheet-style grid in your browser: add or remove rows and columns, rename headers, then export clean CSV. Nothing is uploaded.
How to use the CSV Editor
- 01
Paste your CSV or start from the sample grid.
- 02
Edit cells, rename headers and add or remove rows and columns.
- 03
Download or copy the clean CSV.
What it does
This tool opens a CSV in an editable grid so you can fix a value, rename a header, or add and remove rows and columns without wrestling with quoting in a text editor.
When you are done, the grid exports back to correctly quoted CSV that re-imports cleanly into any spreadsheet.
Editing and clean export
Click any cell to edit it, use the toolbar to add a row or column, and the row and column controls to delete. Paste an existing CSV to load it into the grid.
Export follows RFC 4180: values that contain a comma, quote or line break are wrapped and escaped automatically, so the file is never corrupted by the edit.
Private and unlimited
Every conversion happens locally in your browser, so your data is never uploaded, logged or stored on a server. You can use it on confidential exports without a second thought, and it keeps working offline once the page has loaded.
There is no sign-up, no watermark and no row limit: the only ceiling is your device's memory.
Frequently asked questions
Can I load an existing CSV?
Yes. Use the paste option to drop in a CSV and it fills the grid, header and all. Your edits stay on the page and are never sent anywhere.
Is there a row or file-size limit?
There is no fixed row cap or daily quota. Because everything runs locally the practical limit is your device's memory, which comfortably handles the tens of thousands of rows most exports contain.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser with client-side JavaScript, so nothing you paste or drop ever leaves your device. That makes it safe for spreadsheets that contain customer emails, financial figures or other sensitive data.
Sources
Learn more
Stop Excel Silently Changing Your CSV Data (Zeros, Dates, Big Numbers)
Excel quietly rewrites CSV data on open: dropped leading zeros, gene names turned into dates, IDs in scientific notation. Why it happens and how to stop it.
Comma, Semicolon, or Tab: Why Excel Writes CSV Files That Other Tools Reject
Why Excel exports semicolon CSVs in half of Europe, how the decimal comma causes it, and how to convert or import any delimiter cleanly.
ü Instead of ü: Fixing Broken Special Characters in CSV Files
Why ü, é, and € turn into ü, é, and € when Excel opens a CSV, what the UTF-8 byte order mark does, and how to save and repair files correctly.
Query a CSV with SQL, No Database Setup Required
Load a CSV as a SQL table in your browser and answer real questions with WHERE, ORDER BY, GROUP BY, and HAVING. A worked mini-tutorial on one dataset.
What Is a Pivot Table? Rows, Columns, Values, and Aggregation Explained
A pivot table turns a flat list of records into a cross-tab summary. Learn rows, columns, values, and aggregations with a worked CSV example.
CSV Quoting Rules: Why Splitting on Commas Breaks Your Data
What RFC 4180 actually requires: when a CSV field must be quoted, how to escape a double quote, and why naive split-on-comma parsers corrupt rows.