FlowTable

Free tools

Every tool runs in your browser. No signup, no upload, no file size ransom. When you want it to run without you, that's the paid product.

● LIVE

Clean a messy CSV

Trim, de-duplicate, fix dates and numbers, drop empty rows — see every changed cell.

○ PLANNED

JSON → CSV

Flatten nested JSON, pick the array root, get a spreadsheet-ready file.

○ PLANNED

Fix CSV encoding (UTF-8 / GBK)

Stop the mojibake. Detect the real encoding and re-export as UTF-8 with BOM.

○ PLANNED

Merge CSV files

Stack many exports into one table, with a column that says which file each row came from.

○ PLANNED

Remove duplicate rows

Keep the first (or last) occurrence, match on one column or several.