warcio
Streaming WARC (and ARC) IO library
Decision gist · record as of 2026-08-14
Yes. Warcio is production-stable, actively maintained, has no known vulnerabilities, and installs with minimal friction. Install it if you need to read or write WARC/ARC archives or capture HTTP traffic into web archives.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low friction: pure Python wheel with only six as a runtime dependency.
- Active maintenance with a recent release (136 days ago) and steady repository activity.
License · maintenance · safety
Apache 2.0 (permissive) — Apache 2.0 permissive license allows commercial and private use with minimal restrictions—suitable for most projects.
last release 2026-03-31 (136 days) · last repo commit 2026-06-10 · 467 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 919,403 downloads/mo, #4,721 on PyPI
Alternatives
Verify before relying
from warcio.archiveiterator import ArchiveIterator
with open('path/to/file', 'rb') as stream:
for record in ArchiveIterator(stream):
if record.rec_type == 'response':
print(record.rec_headers.get_header('WARC-Target-URI'))- Whether the package supports Python 3.7 as stated in the description, given classifiers list Python 3.8 as minimum
What it is and what it does
Warcio is a streaming library for reading and writing WARC and ARC archive formats used in web preservation. It provides fast, low-level access to web archival content through an iterator-based API, allowing you to process records one at a time without loading entire archives into memory. The library supports both WARC 1.0 and WARC 1.1 ISO standards, handles on-the-fly ARC-to-WARC conversion, and automatically decompresses and de-chunks HTTP payloads. It also includes HTTP capture functionality that monkey-patches Python's http.client to write requests and responses directly to WARC files, integrating well with the requests library.
The package is designed for web archivists, digital preservation workflows, and applications that need to read or create web archives. It originated as a component of the Webrecorder project and is maintained as a standalone library. With only six as an external dependency and pure Python distribution, it installs cleanly across Python 3.8+ versions.
Use it for
- Extract URLs and content from archived WARC files for analysis or migration to other systems
- Capture HTTP/HTTPS traffic from web scraping scripts directly into WARC files for reproducible archiving
- Convert legacy ARC archives to modern WARC format while preserving record metadata
- Stream remote WARC files over HTTP without downloading them entirely to disk first
- Build web archival pipelines that read, filter, and rewrite WARC records in a single pass
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Warcio is production-stable, actively maintained, has no known vulnerabilities, and installs with minimal friction. Install it if you need to read or write WARC/ARC archives or capture HTTP traffic into web archives.
Install
warcio on PyPI
Before you install
Low friction: pure Python wheel with only six as a runtime dependency. Active maintenance with a recent release (136 days ago) and steady repository activity.
License in practice
Apache 2.0 permissive license allows commercial and private use with minimal restrictions—suitable for most projects.
Quickstart
from warcio.archiveiterator import ArchiveIterator
with open('path/to/file', 'rb') as stream:
for record in ArchiveIterator(stream):
if record.rec_type == 'response':
print(record.rec_headers.get_header('WARC-Target-URI'))Verify before relying
- Whether the package supports Python 3.7 as stated in the description, given classifiers list Python 3.8 as minimum
Package facts
| License | Apache 2.0 permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagesix |
| Maintenance | Actively maintained 136 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 919,403 / month, #4,721 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: Web EnvironmentLicense :: OSI Approved :: Apache Software LicenseProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries :: Python ModulesTopic :: Utilities |
Evidence: warcio-1.8.1-py2.py3-none-any.whl
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See also harfile · pymarc · warc3-wet · warc3-wet-clueweb09 · FastWARC · savepagenow · stream-zip · rarfile · tzst · ar