CSV Viewer
CSV Viewer - a browser-based file tools utility.
Browser tool
About CSV Viewer
Opening a CSV in a sortable table without a spreadsheet mangling it on the way in. Leading zeros survive, long numbers stay as written, and the encoding is detected rather than assumed. Free to open online, with nothing to install and no account to make. Rows of customer data are read locally rather than uploaded anywhere.
How to use it
- Load the dataA file or pasted rows both work, and the delimiter — comma or semicolon — is detected for you.
- Sort and scanNumeric columns sort numerically rather than as text, which is where spreadsheets often surprise people.
- Export if you changed the viewThe exported file preserves what was read rather than reformatting it.
Why spreadsheets damage CSVs
A spreadsheet interprets on import: a postcode with a leading zero becomes a number and loses it, a long identifier becomes scientific notation, and anything resembling a date is converted to one — which is why a well-known set of human genes had to be renamed after years of being silently turned into dates. Reading the file as text avoids all of it.
What it does not do
- This displays a file; it does not modify one. Nothing you do here is written back to disk.
- Very large files are bounded by browser memory.
- CSV has no official standard, so unusual quoting or delimiters may need the options adjusting.
Questions people ask
- Why does my spreadsheet strip leading zeros and this does not?
- Because a spreadsheet guesses that a column of digits is numeric and converts it. Values are kept as text here, so 01234 stays 01234.
- Can it handle semicolon-separated files?
- Yes. Semicolons are standard in locales where the comma is the decimal separator, and the delimiter is detected rather than assumed.
Questions about ToolsVerse itself — privacy, cost, what happens to your files — are answered in the frequently asked questions.
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