Clean CSV Data Online
Trim, Deduplicate & Remove Empty Rows in One Pass
Need to use Clean CSV Data Online right now?
Applies three common fixes at once — trimmed whitespace, removed blank rows, removed duplicates — each toggleable.
3 rows in — 0 empty removed, 1 duplicates removed — 2 rows out
Cleaned CSV
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
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About Clean CSV Data Online
Real-world CSV exports are rarely perfectly clean — stray whitespace around values from a poorly-formatted source, blank rows left over from a spreadsheet template, duplicate entries from a data merge. Each of these is a small, tedious fix on its own, but they commonly show up together in the same messy file.
This tool applies three common cleanup operations to CSV data in one pass, each toggleable independently: trimming leading and trailing whitespace from every cell, removing entirely blank rows, and removing exact duplicate rows. A summary shows exactly how many rows were affected by each operation, so the cleanup is transparent rather than a silent black box.
These three operations cover the most common, unambiguous cleanup needs — they don't attempt more judgment-heavy cleaning like fixing inconsistent capitalization, correcting typos, or standardizing date formats, since those require knowing what "correct" should look like for your specific data rather than a universal rule.
How it works
- Paste your messy CSV data. Paste data with any combination of whitespace, blank rows, or duplicates.
- Toggle the cleanup operations. Choose which of the three operations to apply.
- Copy the cleaned result. See exactly how many rows were fixed, then copy the cleaned CSV.
Examples
Messy input
Input
name, age Alice , 30 Bob,25 Alice ,30
Output
name,age Alice,30 Bob,25 — whitespace trimmed, 1 empty row removed, 1 duplicate removed.