Notepad 默認使用UTF-8無BOM編碼，可通過“編碼”菜單確認選擇的是“UTF-8”而非“UTF-8-BOM”；2. 若文件含BOM，可選擇“轉換為UTF-8”以去除BOM並保存；3. 設置新文件默認編碼為UTF-8無BOM，需在“設置→首選項→新建文檔”中選擇UTF-8編碼；4. 避免BOM因其可能導致PHP頭部已發(fā)送錯誤、JSON解析失敗、腳本shebang失效及Git差異混亂等問題；5. 檢測BOM可通過編碼菜單狀態(tài)或使用Hex-Editor插件查看前三個字節(jié)是否為EF BB BF。因此，Notepad 完全支持UTF-8無BOM編碼，且該編碼在跨平臺開發(fā)中更為安全和通用，只需確保未誤用UTF-8-BOM即可。

Notepad by default saves files with UTF-8 without BOM (Byte Order Mark), which is actually the preferred encoding format in most modern development workflows (eg, web, scripting, version control). However, some applications or systems expect UTF-8 with BOM and may misinterpret files without it — especially on Windows.

But if you specifically want to work with UTF-8 without BOM (which is often ideal), here's how to properly handle it in Notepad :

? 1. Confirm You're Using UTF-8 Without BOM

To ensure your file is encoded as UTF-8 without BOM:

1. Open the file in Notepad .
2. Look at the top menu : Encoding .
3. Check that "UTF-8" is selected (not "UTF-8 BOM").
   • If "Encode in UTF-8" is checked, you're using UTF-8 without BOM.
   • If "Encode in UTF-8-BOM" is checked, it includes the BOM.

? Note : In Notepad , "UTF-8" = without BOM, "UTF-8-BOM" = with BOM.

? 2. Convert to UTF-8 Without BOM (If Needed)

If your file has BOM and you want to remove it:

1. Go to Encoding > Convert to UTF-8 (this option removes BOM).
   • ?? Do not choose "Convert to UTF-8-BOM".
2. Save the file ( Ctrl S ).

Now the file is UTF-8 without BOM.

? This is ideal for PHP, Python, JSON, Git repos, and cross-platform projects where BOM can cause issues (eg, PHP headers already sent errors).

? 3. Set UTF-8 Without BOM as Default for New Files

To make sure new files use UTF-8 without BOM:

1. Go to Settings > Preferences > New Document .
2. Under Encoding , select UTF-8 (this means without BOM).
3. Uncheck “Apply to current opened files” unless needed.
4. Click Close.

Now all new files will be UTF-8 without BOM by default.

? 4. Why Avoid BOM? Common Issues

Although BOM helps some Windows programs detect encoding, it causes problems:

• PHP : BOM can trigger "headers already sent" errors.
• JSON : BOM can break parsing (eg, in web APIs).
• Unix/Linux scripts : BOM may interfere with shebangs ( #!/bin/bash ).
• Git : BOM shows up as invisible changes, confusing diffs.

? So, UTF-8 without BOM is usually safer and more portable .

? 5. How to Detect BOM Presence

Notepad doesn't show BOM visibly, but you can detect it:

• Check Encoding menu:
  • If "UTF-8" is selected → no BOM.
  • If "UTF-8-BOM" is selected → has BOM.
• Or use a hex editor plugin (like Hex-Editor from Plugin Manager) to see the first 3 bytes: EF BB BF = BOM.

Summary

Basically, Notepad handles UTF-8 without BOM just fine — and it's often the better choice. Just make sure you're not accidentally using UTF-8-BOM when you don't need it.

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