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Remove Duplicate Rows from Excel & CSV Online

Same customer entered three times, three slightly different ways? Drop the file below. DataSort's AI catches the exact and fuzzy duplicates that Excel's Remove Duplicates button misses, then keeps the most complete record of each. No COUNTIF, no conditional formatting safari.

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Drag & Drop your Excel or CSV file to convert

Excel (.xlsx) or CSV files

Zero Data Retention
256-bit Encryption

How do I remove duplicates from Excel or CSV online?

Upload your .xlsx or .csv file to DataSort and run the AI deduplication. It finds exact copies and fuzzy near-matches, such as the same customer spelled two ways, and keeps the most complete record of each. Review the preview, then export the deduplicated file. It runs in your browser, is 100% free with no signup required, and needs no formulas.

  1. 1 Drop your Excel or CSV file into the box above.
  2. 2 Run the AI to detect exact duplicate rows and fuzzy near-matches across your columns.
  3. 3 The most complete record of each group is kept; the redundant copies are removed.
  4. 4 Review the preview table and undo anything you want to keep.
  5. 5 Export the deduplicated data as Excel or JSON. Your original file is never modified.

Watch DataSort clean and edit a messy file

Unedited screen recordings of the real app, not an animation.
Every clip below is one continuous take on datasort.app, cleaning and editing a messy export. Nothing is cut. Only the AI's own waiting time is sped up. Pick a clip to watch it here on the page.

Ask the assistant to change the table. Type the change you want in plain English, or take one of the suggestions it offers. It writes the transformation, applies it to the sheet, and tells you what it could not do rather than guessing.

Everything the AI duplicate remover handles for you

Catches fuzzy duplicates

Jon Smith vs John Smith at the same company. ACME Corp. vs Acme Corporation. Rows that differ only in casing or punctuation. The AI treats them as what they are: one record entered twice.

Keeps the most complete record

Excel's built-in tool keeps whichever duplicate appears first, even if it's the empty one. DataSort keeps the row with the most filled-in fields, so the phone number that was only on the second copy survives.

Works on Excel and CSV

Drop an .xlsx, .xls, or .csv file, whether it's a CRM export, a mailing list, or an order log, and dedupe it with the same flow. No Excel installation required.

Cleans while it dedupes

Deduplication works best on clean data, so the AI also fixes headers, standardizes dates and phone formats, and normalizes casing in the same pass. That is exactly how it spots formatting-only duplicates.

Beats COUNTIF and conditional formatting

The classic Excel workflow of helper columns, COUNTIF, color-coded cells, and manual review takes an hour and still misses near-matches. The AI does it in one pass and shows you exactly what it removed.

Free forever, no signup

The Free plan gives you all major features and 5 AI runs every 20 minutes for files up to 500 rows. No account or credit card required.

Tell it what counts as a duplicate

Use the AI Data Assistant to say "treat rows with the same email as duplicates" or "only dedupe on name and company", in plain English. No formula gymnastics required.

100% private processing

Your file is parsed locally in your browser with SheetJS and the backend is stateless. Nothing is persisted on our servers, which matters when the spreadsheet is full of client contact details.

No developer needed

Stop waiting three days for someone to write a dedupe script. Clean the list yourself, send it back the same hour, and close the ticket before your monthly target slips.

How DataSort removes duplicates

1

Upload your spreadsheet

Drop an Excel or CSV file into DataSort. No template is required and no signup is needed to try it on the free tier.

2

Let AI find the duplicates

The AI compares rows by meaning instead of character-by-character, and groups exact copies together with fuzzy near-matches.

3

Review and export

Check what was removed in the preview table, undo anything you disagree with, then export the deduplicated data as Excel or JSON.

Affiliate Program

Teach others how to clean Excel files and get paid.

Are you an Excel pro, B2B software reviewer, or productivity template builder? If you show your audience how to sort data online effortlessly, we want you on our team. Because DataSort functions as a highly capable free tool to clean Excel and manage massive CSV files, your audience can use it instantly for free with zero friction.

It is completely free to join the DataSort Affiliate Program. By recommending our AI-powered Excel cleaner, you are plugging into one of the highest paying software affiliate programs in the data tech space. There are no complicated integrations needed. Just realistically demonstrate how DataSort eliminates duplicate rows and cleans messy formatting to your viewers, and you will earn a massive 40% recurring commission on every referral, for the lifetime of their active subscription. Turn your spreadsheet knowledge into powerful, reliable passive income.

See Commission Tiers Free to join · Instant payouts via PayPro

Common Questions about Removing Duplicates

How do I remove duplicates from an Excel or CSV file online?
Upload the .xlsx or .csv file to DataSort and run the AI deduplication. It finds exact duplicate rows and fuzzy duplicates, marks them, and keeps the most complete record of each. Review the preview table, then export the deduplicated file. No COUNTIF formulas or scripts needed.
Is the duplicate remover free?
Yes. The Free plan includes all major features and 5 AI runs every 20 minutes for files up to 500 rows, completely free with no signup required. Mid and Pro plans raise those limits to 5,000 rows and unlimited rows respectively, with unlimited AI operations.
What counts as a duplicate? Does it catch near-matches?
Both exact copies and fuzzy near-matches. The AI understands that Jon Smith and John Smith at the same company are probably the same person, that ACME Corp. and Acme Corporation are the same account, and that two rows differing only in formatting are one record. Excel's built-in Remove Duplicates only catches exact matches.
Which row is kept when duplicates are found?
The most complete one. Instead of keeping whichever row appears first, the AI keeps the record with the most filled-in fields, so you don't lose the phone number that was only on the second copy.
Will deduplication change my original file?
No. Your original file stays untouched on your computer. DataSort works on a copy in your browser and gives you a new deduplicated file to download, so you can always compare against the original.
Is my data secure?
Absolutely. As a proud member of the Google for Startups Cloud Program, DataSort's infrastructure is built on enterprise-grade security. Files are processed securely in-memory, and we do not permanently store your uploaded spreadsheets on our servers.
Can I edit the data myself after the AI cleans it?
Yes. The results table is a working surface, not a preview. Click the pencil on a cell, double-click it, or select it and press Enter to change a value, and on a phone or tablet just tap the cell. You can rename and resize columns, drag rows into a new order, delete rows, and tick rows to copy, export or delete them in bulk. Every change is marked in a fixed colour so you can see exactly what you touched, and Ctrl+Z (Cmd+Z on a Mac) undoes up to 25 steps.
Do manual edits use up my AI runs or my row limit?
No. Editing happens entirely in your browser and never calls the AI, so nothing you fix by hand counts against your operation limit. The Free plan's 5 runs per 20 minutes apply only to AI cleaning. You can correct as many cells as you like without spending one.
Will I lose my work if I close the tab?
No. Your work is saved automatically in your own browser, and a "Saved sessions" button at the bottom of the page brings it back when you return. Nothing is uploaded to our servers, which is how the zero data retention promise stays true. It also means saved work does not follow you to a different device or browser, and clearing your browser data removes it. Free keeps your most recent session automatically; Mid and Pro can save up to 10 named sessions and switch between them.
What if it removes a row I wanted to keep?
Press Ctrl+Z (Cmd+Z on a Mac) to undo, up to 25 steps back. You can also edit or delete rows yourself in the results table afterwards, without re-running the AI.

How It Works: Technical Methodology

Google Gemini Integration

DataSort uses Google Gemini 2.5 Flash to compare rows by meaning, not just characters. That is how it knows Jon Smith and John Smith at the same company are one person, where exact-match tools see two.

Privacy & Processing

We employ a stateless architecture. Files are parsed locally in your browser using SheetJS, and only the data chunks the AI actually needs are sent to the model. No file data is permanently stored on our servers.

More free DataSort tools

Excel Cleaner Clean messy Excel data with AI. Headers, junk rows, and formats get fixed automatically. CSV Cleaner Fix broken headers and standardize messy CSV exports without opening Excel. Sort Data Online Sort and clean Excel or CSV columns automatically with AI. Merge Excel Files Combine multiple Excel or CSV files into one with AI schema matching. Merge Excel Sheets Combine two or more sheets or tabs into one table. Excel to JSON Convert Excel or CSV files to clean, valid JSON in seconds. Excel to SQL Turn spreadsheet rows into CREATE TABLE and INSERT statements.
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