Rows should be appended.
Use Merge CSV.
SPARKPOND / CATEGORY
CSV File Management Tools
File operations fail when schemas or keys are assumed. These tools expose column mappings, cardinality, output names and ZIP contents first.
Problems covered
What you can solve
- ✓ A file exceeds row limits.
- ✓ Monthly files need stacking.
- ✓ Two tables need key matching.
- ✓ One recipe must process a folder.
6 tools
Tools in this category
Extract and Reorder CSV Columns
Select, remove and reorder CSV or TSV columns locally. Preview the output schema, optionally rename fields and download without an account.
Open →Split a Large CSV File Online
Split CSV locally by row count, part count, approximate bytes or column value. Repeat headers, preview ZIP contents and download without an account.
Open →Merge Multiple CSV Files Online
Merge multiple CSV or TSV files locally with reordered, missing or extra columns. Review schema mapping and file order, then download without an account.
Open →Join Two CSV Files by a Common Column
Join two CSV or TSV files locally with inner, left, right or full joins. Preview duplicate keys, unmatched rows and column collisions without an account.
Open →Compare Two CSV Files Online
Compare two CSV or TSV versions locally by a chosen key. Find added, removed and changed rows, inspect duplicate keys and export a report without an account.
Open →Clean Multiple CSV Files at Once
Apply one local cleaning recipe to multiple CSV files. Check schema compatibility, review per-file reports and download a ZIP with a manifest, no account needed.
Open →Choose well
Which tool should you use?
Columns from two tables should be matched.
Use Join CSV.
One file must become many.
Use Split CSV.
Guides
Understand these problems
How to Merge CSV Files with Different Columns
Files can be merged when their headers are mapped to a common output schema rather than matched by position.
Read →How to Compare Two CSV Files by a Key
A stable key lets rows move without looking changed and connects old and new versions for field comparison.
Read →How to Remove Duplicate Rows from a CSV
Duplicates must be defined by all columns or by stable business keys before rows are removed.
Read →FAQ
Category questions
What is the difference between merge and join?
Merge appends rows; join matches columns from two tables by a key.
Can large outputs be zipped?
Split and batch tools create ZIP files only after processing is requested.
Are schema differences shown?
Yes. Missing, reordered and colliding columns are reviewed before output.