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CSV Merger
Combine several CSV blocks into one table, aligning columns by header name.
Combine several CSV blocks
Blocks used: 0 · Rows merged: 0 · Columns: 0
Shared columns: —
Columns in only some blocks: —
How to use the CSV Merger
- Paste each CSV file into its own block, up to three blocks.
- Choose the delimiter for each block and how the output should be separated.
- Merge the blocks and copy the combined CSV.
Features
- Combines up to three CSV blocks into one table
- Headers aligned by column name, not by position
- Reports columns that appear in only some blocks
- Optional source column and alphabetical column order
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Frequently Asked Questions
Common questions about the free online csv merger.
Paste each file into its own block, pick the delimiter for each one and click Merge blocks to
get a single combined CSV.
Columns are matched by header name, ignoring letter case, so files with the same fields in a
different order still line up correctly.
The result panel lists every column that is not shared by all blocks, so missing fields are
easy to spot.
The merged row simply gets an empty cell for that column, keeping every row aligned with the
same header.
Yes. The source option adds a first column naming the block, which is useful when you combine
exports from different systems.
Three blocks are provided at a time, which is enough for most chores. Merge the result with a
fourth file in a second pass if needed.
No. The header appears once at the top and one row is written for every data row of every
block.
No. The merge happens in your browser, so the pasted files never leave your device.
Yes. Choose the output delimiter and the merged file is written with commas, semicolons, tabs
or pipes.
Yes. It is completely free with no account, no sign-up and no limit on how often you merge
files.
Last updated: October 10, 2026