mojimoji
A fast converter between Japanese hankaku and zenkaku characters
Decision gist · record as of 2026-08-14
Yes, if you need to convert between Japanese character widths. The package is stable, dependency-free, and widely used. The dormant maintenance is not a blocker for a mature, single-purpose tool with no external dependencies. Install it if Japanese text normalization is part of your workflow; skip it if you don't work with Japanese text.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.7 or later; installation relies on pre-built wheels for common platforms.
- Medium install friction due to compiled wheels; pre-built binaries available for Python 3.7–3.12 on macOS, Linux, and Windows, so installation should succeed without compilation on most platforms.
- Maintenance is dormant—last release was 2024-01-12, though the repository remains active and the package is stable.
License · maintenance · safety
permissive license (permissive) — Licensed under Apache License (permissive), so you can use, modify, and distribute the package freely with minimal restrictions.
last release 2024-01-12 (945 days) · last repo commit 2024-01-12 · 152 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 375,150 downloads/mo, #7,141 on PyPI
Alternatives
Verify before relying
pip install mojimoji
import mojimoji
print(mojimoji.zen_to_han('アイウａｂｃ０１２'))
# Output: ｱｲｳabc012
print(mojimoji.han_to_zen('ｱｲｳabc012'))
# Output: アイウａｂｃ０１２- Whether the package handles combining characters or other Unicode edge cases in Japanese text.
- Performance characteristics on very large text volumes or streaming scenarios.
- Whether dormant maintenance affects long-term compatibility with future Python versions beyond 3.12.
- Current adoption and usage patterns in production systems.
What it is and what it does
mojimoji is a Cython-based library for converting Japanese text between hankaku (half-width) and zenkaku (full-width) character forms. It provides two main functions: zen_to_han() converts full-width characters to half-width, and han_to_zen() does the reverse. Both functions accept optional flags to control whether kana, digits, and ASCII characters are converted, allowing fine-grained control over which character classes are affected.
The package is designed for speed and has no runtime dependencies, installing via pre-built wheels for Python 3.7–3.12 on major platforms. Maintenance is dormant (last release 2024-01-12), but the codebase is stable and the repository remains accessible.
Use it for
- Normalize Japanese user input in web forms or data pipelines to a consistent character width.
- Prepare Japanese text for search indexing or matching where width variations should be treated as equivalent.
- Convert legacy half-width Japanese data to full-width for display or compatibility with modern systems.
- Process Japanese text in NLP or text analysis workflows where character width normalization is a preprocessing step.
- Handle Japanese text in databases or APIs where width consistency is required for data integrity.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to convert between Japanese character widths.
The package is stable, dependency-free, and widely used. The dormant maintenance is not a blocker for a mature, single-purpose tool with no external dependencies. Install it if Japanese text normalization is part of your workflow; skip it if you don't work with Japanese text.
Install
mojimoji on PyPI
Before you install
Medium install friction due to compiled wheels; pre-built binaries available for Python 3.7–3.12 on macOS, Linux, and Windows, so installation should succeed without compilation on most platforms. Maintenance is dormant—last release was 2024-01-12, though the repository remains active and the package is stable.
Requires Python 3.7 or later; installation relies on pre-built wheels for common platforms.
License in practice
Licensed under Apache License (permissive), so you can use, modify, and distribute the package freely with minimal restrictions.
Quickstart
pip install mojimoji
import mojimoji
print(mojimoji.zen_to_han('アイウａｂｃ０１２'))
# Output: ｱｲｳabc012
print(mojimoji.han_to_zen('ｱｲｳabc012'))
# Output: アイウａｂｃ０１２Verify before relying
- Whether the package handles combining characters or other Unicode edge cases in Japanese text.
- Performance characteristics on very large text volumes or streaming scenarios.
- Whether dormant maintenance affects long-term compatibility with future Python versions beyond 3.12.
- Current adoption and usage patterns in production systems.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.7 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | None |
| Maintenance | Dormant 945 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 375,150 / month, #7,141 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseNatural Language :: JapaneseProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: mojimoji-0.0.13-cp310-cp310-macosx_10_9_x86_64.whl; mojimoji-0.0.13-cp310-cp310-macosx_11_0_arm64.whl; mojimoji-0.0.13-cp310-cp310-manylinux_2_17_i686.manylinux2014_i686.whl; mojimoji-0.0.13-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; mojimoji-0.0.13-cp310-cp310-win32.whl; mojimoji-0.0.13-cp310-cp310-win_amd64.whl; mojimoji-0.0.13-cp311-cp311-macosx_10_9_x86_64.whl; mojimoji-0.0.13-cp311-cp311-macosx_11_0_arm64.whl; mojimoji-0.0.13-cp311-cp311-manylinux_2_17_i686.manylinux2014_i686.whl; mojimoji-0.0.13-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; mojimoji-0.0.13-cp311-cp311-win32.whl; mojimoji-0.0.13-cp311-cp311-win_amd64.whl; mojimoji-0.0.13-cp312-cp312-macosx_10_9_x86_64.whl; mojimoji-0.0.13-cp312-cp312-macosx_11_0_arm64.whl; mojimoji-0.0.13-cp312-cp312-manylinux_2_17_i686.manylinux2014_i686.whl; mojimoji-0.0.13-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl; mojimoji-0.0.13-cp312-cp312-win32.whl; mojimoji-0.0.13-cp312-cp312-win_amd64.whl; mojimoji-0.0.13-cp37-cp37m-macosx_10_9_x86_64.whl; mojimoji-0.0.13-cp37-cp37m-manylinux_2_17_i686.manylinux2014_i686.whl
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