Open CSV Online
Open a CSV file as a table and edit it.
Drop a file here
or
Your file stays on your device.
- Preview: Excellent
- File info: Yes
- Search: Yes
- Editing: Basic
About CSV files
CSV (comma-separated values) stores a table as plain text: one row per line, columns separated by commas or semicolons. It is the most common way to move data between programs.
Open Online detects the separator, shows the data in a grid with row numbers and lets you edit cells and save a copy. Values are kept exactly as written, so leading zeros and long numbers stay intact.
What you can do here
- Switch between worksheets with tabs
- Scroll large tables smoothly, with row numbers and column letters
- Search all cells and jump between matches
- Click a cell to see its full value
- See sheet sizes, workbook properties and detected column headers
Limitations
- Formulas are shown as their last saved results.
- Charts, images, conditional formatting and cell colours are not displayed.
Privacy
The file is read by your browser and stays on your device. Open Online has no server that could receive it, and nothing is stored once you close the tab. Privacy policy
Common questions
My CSV uses semicolons. Does that work?
Yes. The separator is detected automatically: comma, semicolon, tab or pipe.
Why do my numbers look different in Excel?
Excel converts values on import: it drops leading zeros and turns things like 1-2 into dates. Open Online shows the raw text.
Can I open very large CSV files?
Yes. Only the visible part of the table is drawn, so files with millions of rows stay usable on a desktop.