file-magic
Python front end for libmagic(3)
Decision gist · record as of 2026-08-14
Yes. file-magic is a stable, low-friction wrapper around a well-established system library. It has no Python dependencies, installs cleanly, carries a permissive license, and solves a real problem—reliable file type detection—that's otherwise tedious to implement. The main gotcha is the libmagic system dependency, which is typically already present but must be verified in your deployment environment.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires libmagic system library to be installed on the host system (typically available via system package manager).
- Low install friction; pure Python wheel with no runtime dependencies.
- Repository is active with recent commits and moderate GitHub engagement (1647 stars).
License · maintenance · safety
permissive license (permissive) — Permissive BSD-style license (copyright Ian F. Darwin and contributors) allows commercial and private use with minimal restrictions—attribution and disclaimer retention required.
last release 2022-09-01 (1443 days) · last repo commit 2026-08-05 · 1,647 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 84,589 downloads/mo, #13,984 on PyPI
Alternatives
Verify before relying
import magic
detected = magic.detect_from_filename('example.txt')
print(detected.mime_type)
print(detected.encoding)
print(detected.name)- Whether libmagic is pre-installed on common deployment targets or must be added as a system dependency.
- Performance characteristics when analyzing large files or high-throughput scenarios.
What it is and what it does
file-magic is a ctypes wrapper around the libmagic library, which is the same engine used by the Unix `file` command. It lets you identify what a file actually is—its MIME type, character encoding, and human-readable type name—by examining its content or path, rather than relying on file extensions.
The package has no Python runtime dependencies and installs as a pure wheel, making it lightweight to add to any project. It works by calling into the native libmagic library, so you need libmagic available on your system (usually pre-installed on Linux/macOS, or installable via package manager). The API is straightforward: pass a filename to `detect_from_filename()` and get back an object with `mime_type`, `encoding`, and `name` attributes.
Use it for
- Validate uploaded files in web applications by checking actual MIME type instead of trusting user-supplied extensions.
- Automatically categorize files in batch processing pipelines based on detected type and encoding.
- Build file management tools that need to identify file types for sorting, filtering, or routing decisions.
- Detect character encoding of text files to handle them correctly during import or conversion workflows.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
file-magic is a stable, low-friction wrapper around a well-established system library. It has no Python dependencies, installs cleanly, carries a permissive license, and solves a real problem—reliable file type detection—that's otherwise tedious to implement. The main gotcha is the libmagic system dependency, which is typically already present but must be verified in your deployment environment.
Install
file-magic on PyPI
Before you install
Low install friction; pure Python wheel with no runtime dependencies. Repository is active with recent commits and moderate GitHub engagement (1647 stars).
Requires libmagic system library to be installed on the host system (typically available via system package manager).
License in practice
Permissive BSD-style license (copyright Ian F. Darwin and contributors) allows commercial and private use with minimal restrictions—attribution and disclaimer retention required.
Quickstart
import magic
detected = magic.detect_from_filename('example.txt')
print(detected.mime_type)
print(detected.encoding)
print(detected.name)Verify before relying
- Whether libmagic is pre-installed on common deployment targets or must be added as a system dependency.
- Performance characteristics when analyzing large files or high-throughput scenarios.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=2.7 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 1,443 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 84,589 / month, #13,984 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: BSD LicenseProgramming Language :: PythonProgramming Language :: Python :: 3 |
Evidence: file_magic-0.4.1-py3-none-any.whl
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See also libmagic · python-magic · python-magic-bin · pylibmagic · cigam · filetype · puremagic · polyfile-weave · typecode · isbinary