BOM Tool
Detect, add, or strip the byte-order mark (BOM) on text files.
How to Use
- Drop a text file.
- See detected encoding / BOM.
- Export stripped or BOM-prefixed copy.
BOM signatures
About the BOM Tool
BOM Tool is a quick, free tool for image, audio and file tasks. It works in your browser and keeps everything on your device. Detect, add, or strip the byte-order mark (BOM) on text files.
How it works
Enter what you have and read the result as it updates live. It all runs on your own device, so it is quick and private, with nothing to install.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Why strip BOM?
Some Unix tools, JSON parsers, and PHP includes choke on leading BOM bytes.
Why add BOM?
Windows-native apps (Excel CSV, Notepad) auto-detect UTF-8 only if BOM is present.
How do I use the BOM Tool?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Does it cost anything or need an account?
No. The tool is completely free, there is no account to create, and it keeps working offline after the page first loads.
Is anything I type uploaded?
No. The tool works entirely on your device, so the values you enter never leave your browser.
Common Use Cases
CSV for Excel
Add UTF-8 BOM so Excel doesn't mangle accents.
JSON API
Strip BOM before parsing.
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