Dzzz

Merge CSV & Excel files

On-device

Combine multiple CSV/Excel files into one

Combine multiple CSV, TSV, XLSX or JSON files into one table, right on your device. Align columns by name or position, optionally tag each row with its source file. Nothing is uploaded.

Not sure which CSV tool you need? See all six →

About this tool

What you provide

  • Two or more CSV, TSV, XLSX or JSON files.
  • How to align columns: by column name or by position.
  • An optional column tagging each row with its source file.

What you get

  • One merged table, previewed before you download it.
  • The merged file as CSV, XLSX, JSON or TSV.

Limits

  • Up to 25 MB per file, and the merge runs in your device's memory.
  • Only the first sheet of an Excel workbook is read.
  • When aligning by position, columns beyond the first file's width are ignored.

How to use it

  1. Choose the files

    Tap "Choose files to merge" and select several at once; "Add more files" adds to the list and the ✕ on a row removes one.

  2. Set how columns line up

    Under "Align columns by" pick "Column name" or "Position", and tick the "Add a 'source file' column" box to tag every row with the file it came from.

  3. Run the merge

    Tap "Merge" to build the combined table and show a preview of its first rows.

  4. Download the result

    Choose CSV, XLSX, JSON or TSV to save the merged table.

Frequently asked questions

How do I merge multiple CSV files into one?

Upload the CSV or Excel files you want to combine into the Merge CSV tool, and it stitches them into a single file you can download — everything runs on your device, so your files are never uploaded.

Can I merge Excel and CSV files together?

Yes, the tool accepts both CSV and Excel files and combines them into one output file.

Is Merge CSV free and does it require an account?

Yes — it's free to use and doesn't require any signup or account.