Command line tool to validate and normalize UTF-8 data
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Leonora Tindall 80848d0802
Add --buffered and same stream check
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utf8-norm, validate and normalize UTF-8 Unicode data


Version 1.1.0 licensed GPLv3. (C) 2019 Leonora Tindall <>
Fast command line Unicode normalization, supporting stream safety transformations as well
as NFC, NFD, NFKD, and NFKC. Exits with failure if the incoming stream is not valid UTF-8.


Usage: utf8-norm [--nfc | --nfd | --nfkc | --nfkd] [--stream-safe] [--crlf] <infile> <outfile>

<infile> (default stdin) - file from which to read bytes.
<outfile> (default stdout) - file to which to write normalized Unicode.
-w, --crlf - write CRLF (Windows) instead of LF only (Unix) at the end of lines.
-d, --nfd - write NFD (canonical decomposition).
-D, --nfkd - write NFKD (compatibility decomposition).
-c, --nfc - write NFC (canonical composition computed from NFD). This is the default.
-C, --nfkc - write NFKC (canonical composition computed from NFC).
-s, --stream-safe - write stream-safe bytes (Conjoining Grapheme Joiners, UAX15-D4).
-b, --buffered - read the entire input file into memory before operating on it.
-V, --version - output version information and exit.

The --buffered option is primarily useful for reading and writing to the same file. It will
read bytes from the input until end of file and only then begin processing lines of the

utf8-norm was created at Rust Belt Rust 2019 in Dayton, OH. Thanks to @j41manning for her
excellent talk regarding Unicode handling in Rust.

Natively install as `cargo install utf8-norm` or from your distribution's package manager.