CSV Cleaner — Clean Messy CSV Files Online

CSV files are how the internet moves data around — and somehow they always show up a little bit broken. Stray spaces hiding inside cells. Email addresses with random capital letters. Dates in four different formats in the same column. Duplicate rows that snuck in because someone exported the same report twice. Clean That Sheet is built specifically to take that kind of CSV and hand you back a version that's actually usable.

Drop in a .csv file from anywhere — your CRM, your online store platform, your ad accounts, your analytics tool, a teammate's Google Sheets export, or a hand built list you've been adding to for months. We don't care where it came from. We'll detect the columns, scan every row, and clean the predictable mess: duplicate rows (exact and near duplicates), leading and trailing whitespace, inconsistent casing on names and emails, mixed date formats, empty rows, and column headers that look like they were named in a hurry.

You'll get a free preview of the first 5 cleaned rows so you can see exactly what changed before paying a thing. If the preview looks right, $1.99 unlocks the full cleaned CSV as a download. If it doesn't look right, you walk away — no account, no subscription, no follow-up emails about a webinar.

It's the kind of cleanup that takes 20 minutes by hand on a small file and several hours on a big one. Clean That Sheet does it in a few seconds, and it doesn't get tired and skip rows on the way down. Bring your messiest CSV. We've seen worse.