Fix CSV encoding online — free, no upload

Detect CSV encoding, delimiter, and quoting problems, then download a normalized UTF-8 file without uploading it.

Fix garbled CSV text such as é showing as é by decoding one file entirely in your browser without uploading it, up to 150 MB, then downloading a normalized UTF-8 CSV. Automatic detection trusts UTF-8, UTF-16LE, or UTF-16BE when a BOM is present; otherwise it accepts strict UTF-8 and falls back to windows-1252 when UTF-8 decoding fails. The tool processes one file at a time. If the selected or BOM-declared encoding still produces replacement characters for bytes it cannot decode, those characters are kept in the output and reported so the damage is visible rather than hidden. A repaired file can be larger than the original: windows-1252 characters may take more bytes in UTF-8, and the configured output ceiling is sized separately for that expansion.