Merge Excel Files: free online, fast and secure
Monthly reports, branch-wise sales or exports from different systems usually arrive as separate files. Copy-pasting them together is slow and risky. This tool merges them in one click.
Choose “tabs” to keep each sheet as its own tab, or “stack” to put all rows into one sheet under a single header, with an optional column showing which file each row came from.
How to use Merge Excel Files
- Add files. Select XLSX, XLS, ODS or CSV files.
- Choose merge mode. Tabs or stacked rows, with options for headers and source column.
- Download. Get merged.xlsx.
Why use ConvertKaro Merge Excel Files? Free, fast and secure
There are many Merge Excel Files websites, but most of them upload your files, add watermarks or ask you to pay. Here is why this one is better.
100% Free
Merge Excel Files on ConvertKaro costs nothing. There is no trial, no premium plan and no hidden limit, so you can use it as often as you like.
Fast results
Because nothing travels to a server, results appear almost instantly. Large files are limited only by the speed of your own phone or computer.
Secure and private
Nothing is uploaded. Sensitive files like Aadhaar, PAN, salary slips or contracts stay on your own phone or laptop the whole time.
No signup, no watermark
No account, no email and no watermark on your result. Open the page and start.
Works on every device
Designed for mobile first, so it works just as well on your phone as on a desktop computer.
Source column
Stacked rows can include the original file name, so you never lose track of where data came from.
ConvertKaro vs other online converters
| ConvertKaro | Typical online tool | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your files | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
Common uses for Merge Excel Files
- Combining monthly sales reports
- Joining branch or store exports
- Merging survey responses
- Consolidating attendance sheets
- Preparing one file for pivot tables
Tips for the best results
- For stacking, files should have the same column order.
- Untick “same header row” if files have no headers.
- Remove empty rows before merging for a cleaner result.
- Convert the merged file to CSV with Excel to CSV.
Good to know
Office and data files come in many formats. XLSX is Excel’s modern workbook format with sheets and formatting. CSV is plain text with values separated by commas, perfect for imports. JSON and XML are structured formats used by apps and APIs, and Markdown is a simple way to write formatted text. Merge Excel Files converts between these formats on your device, so business data such as customer lists, invoices and sales reports never leaves your computer.
| Price | Free, no limits |
|---|---|
| Processing | On your device, no upload |
| Signup | Not required |
| Watermark | None |
| Works on | Android, iPhone, Windows, Mac, Linux |
| Category | Office & data tools |
How Merge Excel Files keeps your documents and data files private
Most online converters upload your file to their server, process it there and send it back. That costs time, uses your data pack and means a copy of your file sits on someone else’s computer. Merge Excel Files works differently: the page loads the tool into your browser, and your documents and data files are processed by your own phone or computer. The file never travels over the internet, so it cannot be leaked, stored or misused.
Using Merge Excel Files on your phone
Merge Excel Files is designed for small screens. Buttons are large, options are simple, and downloads save directly to your phone storage. On iPhone, downloaded files appear in the Files app under Downloads; on Android they go to the Downloads folder.
Who uses Merge Excel Files?
Here are some of the people who find this tool most useful:
- Office staff working with Excel, Word and CSV exports
- Accountants converting reports and statements
- Developers and analysts moving data between systems
- Shop owners exporting orders and product lists
- Students and teachers preparing data for projects
Supported input: XLSX, XLS, ODS, CSV, TSV, DOCX, JSON, XML, YAML, Markdown and HTML.
Frequently asked questions
Can I merge CSV and Excel files together?
Yes. Both are read and merged into one XLSX.
What happens to duplicate sheet names?
They are renamed automatically with numbers.
Is formatting kept?
Data and values are kept; complex formatting may be simplified.
Is Merge Excel Files really free?
Yes. Merge Excel Files on ConvertKaro is 100% free with no limits, no signup and no watermark. There is no paid version.
Is it safe to use Merge Excel Files online?
It is one of the safest ways to do it, because nothing is uploaded. All processing happens locally on your device, and the files disappear when you close the page.
Does Merge Excel Files work on mobile?
Yes. It works in Chrome and Safari on Android phones and iPhones, as well as on tablets and computers. No app is needed.
Is there a file size limit in Merge Excel Files?
No upload means no server limit. The only limit is your device’s memory, which comfortably handles everyday files and even large batches.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Your downloaded file is exactly your result.
Does Merge Excel Files work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.
Related free tools
People who use this tool often need these too: CSV to Excel, Excel to CSV, Merge PDF, Excel to JSON, CSV Viewer.