Fast No server upload CSV/JSON

Remove Duplicate Lines / CSV Duplicate Rows - Text & CSV Cleaner

Remove duplicate lines, empty lines and extra whitespace, sort lines, remove duplicate CSV rows, select columns, and convert CSV to JSON Browser only in one place.

Related tools JSON/XML Formatter & Validator Base64 Encoder & Decoder Regex Tester & Replacer
Processing limit: text/CSV files and input data up to 50 MB

Text cleanup options

0
Input lines/rows
0
Output lines/rows
0
Clean up
Text
Current mode

Cleaning Text and CSV Without Losing Structure

Text cleanup can be destructive when duplicate removal, sorting, trimming, or CSV parsing changes meaningful order or whitespace. Treat cleanup as a transformation pipeline: identify what is noise, preview the output, and preserve the original before applying multiple rules.

Line cleanup and CSV cleanup are different

Plain-text operations work on lines, while CSV operations must respect delimiters, quoted fields, headers, and columns. A comma inside a quoted CSV field is data, not a separator, so use the CSV mode when structure matters.

Deduplication needs a definition

Removing duplicate lines compares whole normalized lines. CSV duplicate removal may compare complete rows depending on the selected options. If you need deduplication by one business key only, export or transform carefully and verify which columns participate.

Sorting can change meaning

Alphabetical sorting is useful for lists, but it can destroy chronological, priority, or dependency order. Clean whitespace and duplicates first, then sort only when row order is genuinely irrelevant.

Before cleaning data

Helpful information