How to Remove a BOM From a CSV File
A UTF-8 BOM can confuse scripts and headers. Learn what the BOM is, when to keep it, and how to save CSV files without it.
If your first CSV header looks like email or a script says it cannot find the email column, you may be dealing with a BOM.
BOM stands for byte order mark. It is a marker at the start of a text file. In UTF-8 CSV files it is optional, but some tools write it and some tools do not handle it cleanly.
When a BOM helps
A BOM can help certain apps recognize a file as UTF-8, especially older spreadsheet workflows. If you are sending a CSV to a user who will open it in Excel, a UTF-8 BOM can sometimes prevent garbled characters.
When a BOM hurts
A BOM can hurt when software treats it as real text. The most common symptom is a broken first header:
email,name,status
The visible header should be email, but the hidden marker becomes part of the field name. Import scripts, database loaders, and validation tools may fail because they see a different column name.
For a deeper explanation, see what a BOM is in a CSV file.
Save a copy without the BOM
CEESVEE lets you control whether a BOM is written during export.
Use this workflow:
- Open the original CSV.
- Confirm the text displays correctly.
- Choose Save As.
- Select the target encoding, usually UTF-8.
- Turn BOM off if the downstream tool expects no BOM.
- Save a new copy and test that file.
Keeping the original is useful because another target system may prefer the BOM.
The bottom line
A BOM is not automatically good or bad. It is an export choice. The safest workflow is to make that choice visible and deliberate.
Download CEESVEE for free and save CSV files with or without a BOM depending on the system that needs them.
Frequently asked questions
What is a BOM in a CSV file?
A BOM, or byte order mark, is a small marker at the start of a text file that can signal encoding. In UTF-8 it is optional.
Should I remove the BOM?
Remove it if a downstream script or system treats it as part of the first header name. Keep it if a target app, especially some Excel workflows, needs it to detect UTF-8.
Can CEESVEE save a CSV without a BOM?
Yes. CEESVEE exposes BOM control on export so you can choose whether to write one.