CSV viewer
See your rows as a real table you can sort and search, without a spreadsheet quietly turning your product codes into dates the moment you open the file. It works out how the columns are separated and how the text is encoded, and you can correct it if it guesses wrong.
How to use it
- 1 Drop a CSV or TSV file onto the page.
- 2 Confirm what it worked out about the columns and the text, or set it yourself.
- 3 Sort by any column and filter rows to find what you need.
- 4 Export the current view as CSV or JSON if you want to keep it.
Formats this tool accepts
Each one has a reference page covering what it stores and where it is supported.
Questions about csv viewer
Why does my CSV look wrong in a spreadsheet but fine here?
Spreadsheets convert values as they import. Long numbers become scientific notation, leading zeros are stripped from postcodes and identifiers, and anything that resembles a date is rewritten. This viewer shows the text exactly as it appears in the file.
Can it handle very large files?
The file is parsed in the browser, so tens of megabytes and hundreds of thousands of rows are workable on a desktop machine. The table renders only the visible rows, which keeps scrolling responsive on large data.
What about semicolons or tabs as separators?
Both are detected automatically, which covers the semicolon convention used in locales where the comma is the decimal separator, as well as tab separated exports. You can override the detection if a file is unusual.
Are my files uploaded to a server?
No. The whole thing runs inside the browser tab you already have open. Your file is read straight from your own disk, worked on there, and handed back as a download. Nothing is sent anywhere, nothing is stored, and there is no account and no queue.
Is there a file size limit?
There is no server-side limit because there is no server. The practical ceiling is your device memory, since the file and its output both have to fit in the tab. Files up to a few hundred megabytes are usually fine on a desktop machine, while phones and older laptops will struggle sooner. If a large file fails, close other tabs and try again.
Does it work offline?
Yes, once the page has loaded once. The engine is cached by the browser, so you can turn off your connection, reload the page and keep working. That is a useful side effect of doing the processing locally rather than a separate offline mode you have to enable.
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