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I would like to find out, if a pdf file is encoded in UTF-8. How to check, which caracter encoding is used in a pdf file?
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Open the file in Notepad. Click 'Save As...'. In the 'Encoding:' combo box you will see the current file format. Yes, I opened the file in notepad and selected the UTF-8 format and saved it.
PDF files are either 8-bit binary files or 7-bit ASCII text files (using ASCII-85 encoding). Every line in a PDF can contain up to 255 characters.
There are a few options you can use: check the content-type to see if it includes a charset parameter which would indicate the encoding (e.g. Content-Type: text/plain; charset=utf-16 ); check if the uploaded data has a BOM (the first few bytes in the file, which would map to the unicode character U+FEFF - 2 bytes for ...
A PDF is a binary file, not a text file.
A character encoding like "UTF-8" makes only sense in context with text files (*.txt, *.html, *.xml, *.csv, ...).
Thus, a PDF never is UTF-8 encoded.
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