Why do I see boxes or question marks?

The player may be decoding the file with a different character encoding than the one used to save it.

Is encoding detection always certain?

BOM and valid UTF-8 detection are strong. Distinguishing similar legacy single-byte encodings is heuristic.

Yes. UTF-8 is the most portable modern choice for multilingual subtitle text.

Diagnose broken accents and unreadable subtitle characters. Detection and UTF-8 conversion happen locally in your browser.

Local processing — your file is not sent to a server

Choose a subtitle file

The file stays in your browser.

Choose a file to detect its encoding.

Why do I see boxes or question marks?: The player may be decoding the file with a different character encoding than the one used to save it.
Is encoding detection always certain?: BOM and valid UTF-8 detection are strong. Distinguishing similar legacy single-byte encodings is heuristic.
Is UTF-8 safe for modern players?: Yes. UTF-8 is the most portable modern choice for multilingual subtitle text.