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I am on Windows XP sp3 and I am trying to convert a file from ASCII to UTF-8.

I use notepad++ to do this. I go to Encoding > Convert to UTF-8 without BOM. I save the file, reopen and it is still on ASCII.

I am using this file in a webpage and I need the file to be UTF-8, because I have strings in utf-8 and they am seeing little squares with ? on them.

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Just for giggles have you copied everything then opened a new document pasted and saved as utf8? – MrStatic Dec 31 '09 at 20:38
Yes I have. And it didn't work! – AntonioCS Dec 31 '09 at 23:01

Do the following:

  1. File->New
  2. Encoding->Encode in UTF-8 without BOM
  3. Copy and Paste your original text into this new file
  4. Save.

It works on my computer with Windows XP SP3 and Notepad++v5.6.8. Hope it works on your computer also.

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