Convert Strings Between Given Encodings

These functions convert strings between encodings. They aim to replace R's iconv. They are not only faster, but also much more portable - they work in the same manner on all platforms.

stri_encode(str, from = NULL, to = NULL, to_raw = FALSE)

stri_conv(str, from = NULL, to = NULL, to_raw = FALSE)


a character vector, a raw vector, or a list of raw vectors to be converted


input encoding: NULL or "" for the default encoding or internal encoding marks' usage (see Details); otherwise, a single string with encoding name, see stri_enc_list


target encoding: NULL or "" for default encoding (see stri_enc_get), or a single string with encoding name


a single logical value; indicates whether a list of raw vectors rather than a character vector should be returned


stri_conv is an alias for stri_encode.

Please refer to stri_enc_list for the list of supported encodings and stringi-encoding for a general discussion.

If str is a character vector and from is either missing, "", or NULL, then the declared encodings are used (see stri_enc_mark) -- in such a case bytes-declared strings are disallowed. Otherwise, the internal encoding declarations are ignored and a converter selected via from is used.

If str is a raw-type vector or a list of raw vectors, we assume that the input encoding is the current default encoding as given by stri_enc_get.

For to_raw=FALSE, the output strings have always marked encodings according to the target converter used (as specified by to) and the current default Encoding (ASCII, latin1, UTF-8, native, or bytes in all other cases).

Note that some issues might occur if to indicates, e.g, UTF-16 or UTF-32, as the output strings may have embedded NULs. In such cases, please use to_raw=TRUE and consider specifying a byte order marker (BOM) for portability reasons (e.g., set UTF-16 or UTF-32 which automatically adds the BOMs).

Note that stri_encode(as.raw(data), "encodingname") is a clever substitute for rawToChar.

In the current version of stringi, if an incorrect code point is found on input, it is replaced by the default (for that target encoding) substitute character. Also, in such a case a warning is generated.


If to_raw is FALSE, then a character vector with encoded strings (and appropriate encoding marks) is returned. Otherwise, a list of raw vectors is produced.


Conversion -- ICU User Guide,

Converters -- ICU User Guide, (technical details)

See Also

Other encoding_conversion: stri_enc_fromutf32(), stri_enc_toascii(), stri_enc_tonative(), stri_enc_toutf32(), stri_enc_toutf8(), stringi-encoding

  • stri_encode
  • stri_conv
Documentation reproduced from package stringi, version 1.4.6, License: file LICENSE

Community examples

Looks like there are no examples yet.