---
name: "hfst-fst2fst"
section: "1"
platform: "linux"
package: "hfst"
version: "3.16.2-1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/hfst-fst2fst"
---

# hfst-fst2fst(1)

\=Convert transducers between binary formats

## NAME

hfst-fst2fst - =Convert transducers between binary formats

## SYNOPSIS

**hfst-fst2fst** \[*OPTIONS*...\] \[*INFILE*\]

## DESCRIPTION

Convert transducers between binary formats

### Common options:

- **-h**, **--help**

  Print help message

- **-V**, **--version**

  Print version info

- **-v**, **--verbose**

  Print verbosely while processing

- **-q**, **--quiet**

  Only print fatal erros and requested output

- **-s**, **--silent**

  Alias of **--quiet**

### Input/Output options:

- **-i**, **--input**=*INFILE*

  Read input transducer from INFILE

- **-o**, **--output**=*OUTFILE*

  Write output transducer to OUTFILE

### Conversion options:

- **-f**, **--format**=*FMT*

  Write result in FMT format

- **-b**, **--use-backend-format**

  Write result in implementation format, without any HFST wrappers

- **-S**, **--sfst**

  Write output in (HFST's) SFST implementation

- **-F**, **--foma**

  Write output in (HFST's) foma implementation

- **-x**, **--xfsm**

  Write output in native xfsm format

- **-t**, **--openfst-tropical**

  Write output in (HFST's) tropical weight (OpenFST) implementation

- **-l**, **--openfst-log**

  Write output in (HFST's) log weight (OpenFST) implementation

**-O**, **--optimized-lookup-unweighted** Write output in the HFST optimized-lookup implementation

- **-w**, **--optimized-lookup-weighted**

  Write output in optimized-lookup (weighted) implementation

- **-Q** **--quick**

  When converting to optimized-lookup, don't try hard to compress

If OUTFILE or INFILE is missing or -, standard streams will be used. Format of result depends on format of INFILE FMT must be name of a format usable by libhfst, i.e. one of the following: { foma, openfst-tropical, openfst-log, sfst, xfsm

-

  optimized-lookup-weighted, optimized-lookup-unweighted }.

Note that xfsm format is always written in native format without HFST wrappers.

## REPORTING BUGS

Report bugs to \<hfst-bugs@helsinki.fi\> or directly to our bug tracker at: \<https://github.com/hfst/hfst/issues\>

hfst-fst2fst home page: \<https://github.com/hfst/hfst/wiki/HfstFst2Fst\>\
 General help using HFST software: \<https://github.com/hfst/hfst/wiki\>

## COPYRIGHT

Copyright © 2017 University of Helsinki, License GPLv3: GNU GPL version 3 \<http://gnu.org/licenses/gpl.html\>\
 This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.