CSV Viewer & Editor
Open, sort, filter and fix a CSV without a spreadsheet.
CSV Viewer opens a CSV or TSV as a sortable, filterable table you can search, edit cell by cell, and export again as CSV or .xlsx. Only the visible rows are drawn, so a file with tens of thousands of rows stays responsive. The file is read on your device.
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Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use CSV Viewer & Editor
- Choose a CSV or TSV file, or paste rows in.
- Sort by clicking a heading, filter with the search box, edit a cell by clicking it.
- Export the result as CSV or as an .xlsx workbook.
Questions about CSV Viewer & Editor
How large a file can it open?
The limit is your device’s memory rather than a fixed row count, because the whole file is held in the tab. Only the visible window of rows is drawn, so scrolling stays smooth at tens of thousands of rows. On a phone, expect a few tens of megabytes to be comfortable; on a laptop, considerably more.
Does it change my original file?
No. The file on your disk is never written to. Edits live in the tab until you export, which produces a new file in your downloads. If something goes wrong you still have the original exactly as it was.
Why does my file open as a single column?
The separator was probably a semicolon or a tab rather than a comma, which happens with exports from European locales. The separator is detected automatically and shown in a control you can change; switch it and the table redraws.
Is it safe to open a file with personal data?
The file is read with the File API and parsed by JavaScript in the tab. It is not uploaded and there is no server that could hold a copy. You can check this yourself: open the browser’s network tab, load a file, and watch that no request carries it.
Are quoted fields and embedded commas handled correctly?
Yes. Parsing follows RFC 4180, so a quoted field may contain commas, line breaks and doubled quotes without breaking the row. That is where most naive CSV readers, including a lot of spreadsheet imports, go wrong.
Is CSV Viewer & Editor really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use CSV Viewer & Editor?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.