Updated October 23, 2026
On every plan
Merge many files into one spreadsheet
Combine multiple CSV and Excel files into one spreadsheet. Operelio lines up matching columns, fills gaps with blanks, and stacks the rows in the order you arrange the files.
Doing it in Excel instead? See how to merge two Excel files into one.
Free merges up to 2 files per job. Starter, Pro and Agency raise that to 10, 15 and 25.
What it does
One output file from many inputs
Automatic header matching
Operelio matches columns whose headers are identical: same letters, casing, and spacing. If your files mix "Email" and "email", run Clean Headers first so the merge lines up.
CSV and Excel in the same job
Upload any mix of .csv, .xlsx, and .xls files. Operelio reads them all in one job, so you don't need to convert anything first.
Handles mismatched columns
When one file has a column the others don't, Operelio adds it to the output and leaves the missing cells blank. Every value lands in its right column, up to your plan's row limit.
Mismatch warnings
Before you run, Operelio previews the merged rows and says what each file does to the columns, such as "Adds Ticket type" or "No Amount". Swap a file out, fix it, or let Operelio merge as-is and leave the gaps blank.
2 files on Free, 10 on Starter, 15 on Pro, 25 on Agency
Free merges up to 2 files per job. Starter merges up to 10. Pro handles up to 15. Agency handles up to 25. Each file's rows are stacked in the order you arrange them.
One output, ready to use
You get a single XLSX file with one header row and all your data rows underneath. Free processes up to 2,000 rows per job; Starter up to 50,000; Pro up to 75,000; Agency up to 150,000. Open it in Excel or Sheets, hand it off, or import it into your CRM.
How to use it
Upload your files, get one spreadsheet
Upload your files
Select two or more files. Drag and drop or browse. CSV and Excel work together.
Check the preview
Before you run, you see the merged rows as they'll be in the file, and a note on each file saying which columns it adds or lacks.
Download the merged file
Click Merge files and download a single file with all rows combined. One header row, all your data.
The alternative
Doing it yourself
This is what merging files looks like without a tool.
In Excel or Google Sheets
Repetitive copy-paste. Column misalignment is easy to miss and corrupts the merged output. Gets worse with each additional file.
With Merge Files
Columns aligned for you. Gaps filled with blanks. Warnings for any mismatches. No manual work.
Mismatched columns might not be the only problem in that file
Upload it and Bridgeant reviews the file before you commit to a tool. It reports what it finds, orders the problems by how much they actually matter, and points you at the tool for each one. That is on every plan including Free, and it works from a summary of your file rather than the contents.
On Starter and up it stops advising and starts doing. Describe the job in a sentence and Bridgeant plans the steps, shows you the plan, and runs them in the right order once you approve. You are not running four jobs by hand and trying to remember which came first.
Bridgeant, the agent inside OperelioPricing
On every plan.
Merge Files is on every plan, with CSV and Excel in and one XLSX out. Free merges up to 2 files per job (2 MB each, 2,000 rows total), Starter up to 10 files (25 MB each, 50,000 rows), Pro up to 15 files (35 MB each, 75,000 rows), Agency up to 25 files (100 MB each, 150,000 rows). Each run uses one job: 5 a month on Free, 300 on Starter, 1,000 on Pro, 3,000 on Agency. Starter from $29.25 a month, Pro from $74.25, Agency from $224.25, billed annually.
Common questions
Merge Files FAQ
What happens when files have different columns?
The output has every column that appears in any file. Matching is by exact header name and is case-sensitive: "Email" and "email" become two separate columns. If one file has a column the others don't, that column is added and the missing cells are left blank.
Can I merge CSV and Excel files together?
Yes. Upload any mix of .csv, .xlsx, and .xls files. Operelio reads each format and combines them into a single output file.
How many files can I merge at once?
Free merges up to 2 files per job. Starter plans merge up to 10. Pro plans handle up to 15. Agency plans handle up to 25.
What's the row limit on the merged output?
Free processes up to 2,000 rows per job; Starter up to 50,000; Pro up to 75,000; Agency up to 150,000. If your combined files go over the cap, Operelio merges the rows that fit and shows a banner with the total and what was processed.
Does it work with multi-tab workbooks?
Yes, two ways. Merging separate files, each workbook in your list has its own Tab menu, so every workbook contributes exactly the tab you choose (the first tab by default). Or upload one workbook on its own and check the tabs to stack into a single list, with an optional Source Tab column recording which tab each row came from. Combining tabs is available on every plan, including Free.
Is Merge Files free?
Yes, up to 2 files per job. Paid plans raise that: Starter ($39/month) merges 10 files per job, Pro ($99/month) 15, Agency ($299/month) 25. See /pricing for the full breakdown.
Will the output have one header row or many?
One. Operelio reads each file's header row and writes one combined header to the output. All data rows from every file go below it, up to your plan's row limit.
What order are the rows in?
Rows are stacked in the order the files appear in your list, with each file's original row order preserved. You can reorder the files with the arrows next to each one before running.
Works well with
Want the full walkthrough? Read the Merge Files guide →
Related how-to: How to merge two Excel files into one
Stop copy-pasting between spreadsheets.
Upload your files, get a single spreadsheet. Columns matched, gaps filled, ready to use.