CSV vs TSV: Which Should You Use?

Short answer: Use TSV when your data contains commas — names, addresses, descriptions, anything written by a human. Use CSV when it does not, or when the system you are feeding only accepts it. TSV needs no quoting, which removes an entire class of bug.

Side by side

	CSV	TSV
Separator	Comma `,`	Tab `⇥`
Quoting needed?	Yes, whenever a value contains a comma	Almost never — tabs rarely occur in data
Spreadsheet opens it directly	Yes, usually with an import dialog	Yes, and copy-paste is native
Survives addresses and free text	Only with correct quoting	Yes
Visible in a text editor	Yes	Tabs are invisible, which hides errors
European locale issues	Yes — comma is a decimal separator	No
File size	Marginally smaller	Same order of magnitude

When to pick each one

Choose CSV when

A system that only accepts .csv
Numeric IDs and codes with no free text
Maximum compatibility with older importers

Choose TSV when

Any column containing names, addresses or descriptions
Copy-paste between spreadsheets
Unix pipelines using cut -f
Avoiding quote-escaping entirely

A quick way to decide

Ask one question: could any value contain a comma?

Yes — names, addresses, product titles, free text. Use TSV.
No — numeric IDs, dates, codes. Either works, so use CSV for compatibility.
Not sure? Use TSV. It costs nothing and removes the risk.

Check your data first with the line counter or clean it with list clean-up.

Convert between them

Decided? These load the converter already set up for the job.

Convert CSV to TSV Paste comma-separated values, get tab-separated values back. Runs in your browser, so… Convert TSV to CSV Paste tab-separated values — the format you get when you copy cells out of a spreadsheet…

Or see all 16 delimiter conversions and the full delimiter converter.

Frequently Asked Questions

Is TSV better than CSV?

TSV is safer for data containing commas, because tab characters almost never appear inside real values and so need no quoting. CSV is more widely accepted by older software. Neither is universally better.

Can Excel open a TSV file?

Yes. Excel reads tab-separated files directly, and copying cells out of Excel produces tab-separated text. Renaming a .tsv to .txt sometimes gives a smoother import dialog.

Which format is smaller?

They are effectively the same size. A comma and a tab are both one byte, so the only difference comes from quote characters, which CSV needs and TSV usually does not.

From the blog

How to Convert Excel to CSV with a Pipe Delimiter for Database Uploads Most databases don't play well with comma-delimited files when your data contains commas. Here's how to convert Excel to a pipe-delimited CSV so your database uploads go smoothly every time. Why Your CSV is Broken: Common Delimiter Errors and How to Fix Them CSV files break in predictable ways. Learn the most common delimiter errors, why they happen, and how to fix them fast without rewriting your data by hand. How to Escape Delimiters in CSV Files to Prevent Data Errors An unescaped comma can silently corrupt your CSV data. Learn how RFC 4180 quoting and escaping rules work, the most common mistakes to avoid, and how to verify your files before importing.