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Merge or Combine Excel Files Into One, Free

Trying to merge Excel files with different headers? Stop the manual work. Use our free AI cleaner to standardize columns, remove duplicates, and automatically merge all your files into one perfectly formatted dataset.

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Excel (.xlsx) or CSV files

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How do I merge multiple Excel files into one?

Upload your Excel (.xlsx, .xls) or CSV files to DataSort. The first file serves as your Master Schema, and our AI automatically aligns column headers from all other files to match it, even when column names differ (like "Email" vs "E-mail"). You can review the unified preview in your browser, resolve matching entity rows, and export a single combined spreadsheet with zero formulas, VBA, or Power Query.

  1. 1 Drop two or more Excel or CSV files into the upload box above.
  2. 2 DataSort establishes the first file as the Master Schema and maps corresponding columns from subsequent files.
  3. 3 Click Run AI Merge to align mismatched headers and consolidate rows.
  4. 4 Inspect the combined table in your browser. Edit values, rename headers, or remove unwanted rows.
  5. 5 Click Export to download your unified workbook as an Excel (.xlsx), CSV, or JSON file.

Watch DataSort clean the data you are merging

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 before and after a merge. Nothing is cut. Only the AI's own waiting time is sped up. Pick a clip to watch it here on the page.

Clean a messy file with AI. One pass finds the real header, fixes capitalisation, standardises dates, trims stray spaces and fills blank cells, then lists every change it made so you can check it or put any of it back.

Everything the AI file merger handles for you

The first file sets the shape

Your first file becomes the Master Schema, and every other file is aligned to it. You decide what the finished table looks like by choosing what to drop in first, rather than by editing headers afterwards.

Headers that disagree, matched anyway

AI Smart Mapping pairs Email with E-mail with Contact Email and shows a confidence badge for each pairing. Mismatched headers are the usual reason a multi-file merge quietly loses a column.

Excel and CSV in the same merge

Drop .xlsx, .xls and .csv files together. Each one is parsed in your browser, so leading zeros, long IDs and exact text encodings survive the merge instead of being reformatted on the way in.

Stack the rows or add up the numbers

Choose Keep every row to put every file's rows into one table, or Add up the numbers to roll numeric columns up by a shared key so each customer or product ends on one line with a correct total.

The same record from two files, once

Entity resolution spots a shared key such as Email or ID. Somebody who appears in file one and file three is combined into a single row rather than quietly becoming two rows in your final count.

Nothing to write and nothing to install

No VLOOKUP, no Power Query, no VBA and no add-in. You see the combined table before you commit to it, and you can undo any step, so a merge that looks wrong costs you a click rather than an afternoon.

How DataSort merges your Excel files

1

Drop your files in

Add two or more Excel or CSV files at once. Each becomes a tab, and the first one you add sets the Master Schema.

2

Pick the files and the strategy

Choose which files to combine, then Keep every row to stack them, or Add up the numbers to total them by a shared key.

3

Check the mapping and export

Review each column pairing, override anything that reads wrong, then export one combined file as Excel, CSV, JSON or SQL.

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 Merging

Why do my Excel merges fail?
Merges usually fail because of inconsistent headers (e.g., "Email" vs "E-mail") or formatting discrepancies. DataSort uses AI Smart Merge to detect these inconsistencies, standardize them to your Master Schema, and even write custom code to split or transform fields so they match perfectly.
Can I combine multiple Excel files into one?
Yes. Combining and merging are the same job here, whatever you call it. Drop in several Excel or CSV files and DataSort reads every one, matches the columns even where the headers are worded differently, and writes a single table you can check before you export it. The originals are left as they are.
Can it merge same-entity rows?
Yes. DataSort detects unique keys (like Email or ID) and performs Entity Resolution. This means if "John Doe" exists in File A and File B, their data is combined into a single row, rather than creating duplicates.
How many files can I upload?
You can upload and merge as many files as you need! The first file serves as the "Master Schema", and our AI automatically aligns all subsequent files to match its structure. On the Free plan you can combine 2 sheets at a time. Upgrade to Mid or Pro for unlimited merging.
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.
Is this cleaner free?
Yes. DataSort is 100% free to use with all core features included and no signup or credit card required. The Free plan handles files up to 500 rows with 5 AI runs every 20 minutes. Mid raises that to 5,000 rows per file and Pro removes the row limit entirely.
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 can save up to 10 named sessions and Pro up to 50, and switch between them.
Can I fix a column the merge mapped wrong?
Yes. Rename the column from its header, drag rows around, and edit any value directly in the results table. You do not need to re-run the merge or spend another AI run to correct a mapping.

How It Works

Smart Header Recognition

DataSort's AI understands that "Client Name", "Customer", and "Name" likely refer to the same thing. It unifies these headers to ensure successful merging.

Secure & Private

We process your files in-memory using stateless architecture. Your data is not 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. Remove Duplicates Dedupe Excel and CSV rows. Catches exact and fuzzy matches. Sort Data Online Sort and clean Excel or CSV columns automatically with AI. 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. Compare Excel & CSV Files See every change between two files side by side, free with an account. Compare JSON Files Structural diff of two JSON documents, right in your browser.
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