🌐 Website Downloader CLI

Turn any website you're authorized to copy into a fast, browsable offline mirror — with one command.

A modern, hackable alternative to wget --mirror and HTTrack — built in pure Python, without dragging in a heavy crawler framework.

📖 Read the Wiki — full CLI reference, cookbook, and troubleshooting · 📦 Install from PyPI

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Open example_backup/index.html in your browser — the whole site works from disk: pages, styles, scripts, images, fonts, and media, all with links rewritten for offline browsing.

⚡ Quick Start

git clone https://github.com/PKHarsimran/website-downloader.git
cd website-downloader

python -m venv .venv
.venv\Scripts\activate        # macOS/Linux: source .venv/bin/activate
pip install -e .

website-downloader --url https://example.com --destination example_backup --max-pages 100

The classic script entry point still works too:

python website-downloader.py --url https://example.com --destination example_backup

🤔 Why Not Just wget or HTTrack?

Those tools are great — until you hit a modern website. This project exists for the gap between "one-liner that misses half the assets" and "write your own Scrapy project."

	website-downloader	wget --mirror	HTTrack	Scrapy
Modern assets: srcset, data-src, poster, CSS @import, JS asset strings	✅	partial	partial	build it yourself
JavaScript rendering (React, Vue, Next.js)	✅ Playwright	❌	❌	plugin
Incremental re-mirroring (ETag / Last-Modified)	✅	timestamps only	✅	manual
Cookies + custom headers for authorized portals	✅	✅	✅	✅
Selective CDN mirroring with a domain allowlist	✅	❌	partial	manual
Zip + WARC export	✅	WARC ✅	❌	manual
Windows-safe paths (long paths, reserved names, query hashing)	✅	❌	partial	manual
Small, readable Python codebase you can extend	✅	❌ (C)	❌ (C)	framework

✨ Highlights

• 🚀 Fast — parallel page fetching (--page-threads, ~3–4× faster on multi-page sites), threaded asset downloads, and optional lxml parsing (pip install -e ".[fast]").
• 🔁 Incremental — --update skips unchanged pages and assets using ETag/Last-Modified, perfect for recurring archives.
• ⚛️ JavaScript-aware — optional Playwright rendering for client-rendered sites (--render-js).
• 🍪 Authenticated — reuse browser cookies and custom headers for portals, intranets, and staging sites you're allowed to access.
• 🧭 Sitemap seeding — start from sitemap.xml (including nested sitemap indexes) for complete discovery.
• 📦 Portable output — export mirrors as zip archives or WARC 1.1 response records.
• 🤝 Polite by default — sequential pages unless you opt in, --respect-robots, --delay, retry with backoff, and per-asset size caps.
• 🪟 Cross-platform paths — sanitizes Windows reserved names, shortens long paths, and hashes query strings to avoid collisions.
• 🧪 Tested — pytest suite running against a real local HTTP fixture server, with CI and lint gates.

🛠 How It Works

flowchart TD
    A["Start with a URL and CLI options"] --> B["Create session with cookies, headers, retries"]
    B --> C{"Use sitemap?"}
    C -- "Yes" --> D["Load sitemap URLs into the page queue"]
    C -- "No" --> E["Queue the starting URL"]
    D --> F["Fetch next page"]
    E --> F
    F --> G{"Update cache says unchanged?"}
    G -- "Yes" --> H["Reuse saved local file"]
    G -- "No" --> I{"Render JavaScript?"}
    I -- "No" --> J["Download HTML with requests"]
    I -- "Yes" --> K["Render page with Playwright"]
    J --> L["Parse HTML with BeautifulSoup"]
    K --> L
    H --> L
    L --> M["Find page links and asset links"]
    M --> N{"Same-site page?"}
    N -- "Yes" --> O["Queue page for crawling"]
    N -- "No" --> P{"Asset allowed?"}
    P -- "Yes" --> Q["Download asset"]
    P -- "No" --> R["Keep original reference or skip"]
    O --> S["Rewrite links for offline browsing"]
    Q --> S
    R --> S
    S --> T["Save mirror folder"]
    T --> U{"Export requested?"}
    U -- "Zip/WARC" --> V["Write portable archive"]
    U -- "No" --> W["Open index.html locally"]
    V --> W

In plain English:

1. You give the CLI a starting URL and optional crawl settings.
2. It can seed pages from sitemap.xml, custom headers, cookies, and robots rules.
3. It downloads or optionally renders each page with Playwright.
4. It finds links, images, scripts, stylesheets, fonts, media, and metadata assets.
5. It follows same-site pages up to your --max-pages limit.
6. It saves assets locally and rewrites references so pages still work offline.
7. With --update, unchanged resources are skipped using cache metadata.
8. With --zip-output or --warc-output, the result is also exported as an archive.

📦 Install Options

Start with the core install, then add extras only when you need them:

Install	Use when you want
pip install -e .	Normal static-site crawling with requests and BeautifulSoup.
pip install -e ".[fast]"	Faster HTML parsing with lxml (used automatically when installed).
pip install -e ".[render]"	Playwright-powered JavaScript rendering with --render-js or --headless.
pip install -e ".[ux]"	Rich-powered terminal progress with --progress.
pip install -e ".[dev]"	Tests, formatting, linting, and local contributor work.

📖 Cookbook

Mirror a small public site:

website-downloader ^
  --url https://example.com ^
  --destination example_backup ^
  --max-pages 50

Speed up a large mirror with parallel page fetching:

website-downloader ^
  --url https://example.com ^
  --max-pages 500 ^
  --page-threads 4

--page-threads defaults to 1 so crawls stay polite; raise it only for sites that can handle concurrent requests. --render-js always uses a single page worker.

Download selected CDN assets:

website-downloader ^
  --url https://example.com ^
  --destination example_backup ^
  --download-external-assets ^
  --external-domains cdn.example.com fonts.gstatic.com

Mirror an authorized site with cookies:

website-downloader ^
  --url https://intranet.example.com ^
  --destination intranet_backup ^
  --cookie-file example-cookie.txt

Cookie files use normal cookie header syntax:

sessionid=abc123; csrftoken=xyz789

Send custom headers such as bearer tokens:

website-downloader ^
  --url https://docs.example.com ^
  --destination docs_backup ^
  --header "Authorization: Bearer <token>" ^
  --header "X-Environment: staging"

Use a sitemap as the crawl seed:

website-downloader ^
  --url https://example.com ^
  --destination example_backup ^
  --sitemap

Point at a custom sitemap URL or local sitemap file:

website-downloader --url https://example.com --sitemap https://example.com/sitemap.xml

Use safer crawl limits:

website-downloader ^
  --url https://example.com ^
  --max-pages 50 ^
  --threads 4 ^
  --delay 0.25 ^
  --respect-robots ^
  --max-asset-bytes 25000000 ^
  --user-agent "WebsiteDownloader/0.2"

Update an existing mirror without re-downloading unchanged resources:

website-downloader ^
  --url https://example.com ^
  --destination example_backup ^
  --update

Export a portable zip and WARC archive:

website-downloader ^
  --url https://example.com ^
  --destination example_backup ^
  --zip-output example_backup.zip ^
  --warc-output example_backup.warc

⚛️ JavaScript-Rendered Sites

Some modern sites do not expose their real links and assets until JavaScript runs. For those, install the optional Playwright extra:

pip install -e ".[render]"
playwright install chromium
website-downloader --url https://example.com --render-js --max-pages 20

--headless is also available as a friendly alias for --render-js.

--render-js and --headless are optional because Playwright is heavier than the default requests + BeautifulSoup path. Use them when a normal crawl only captures an empty app shell or misses important client-rendered links.

📊 Live Progress

Install the optional UX extra for a Rich-powered terminal dashboard:

pip install -e ".[ux]"
website-downloader --url https://example.com --progress

If rich is not installed, the crawler falls back to normal logging instead of failing.

🎛 Feature Flags At A Glance

Flag	What it does	Best for
--page-threads	Fetches HTML pages concurrently (default 1).	Faster mirroring of large sites that tolerate concurrent requests.
--render-js / --headless	Uses Playwright before parsing the page.	React, Vue, Angular, Next.js, and other client-rendered sites.
--cookie-file	Sends saved browser/session cookies.	Authorized portals, staging sites, docs behind login.
--header	Adds custom request headers.	Bearer tokens, staging headers, API gateway headers.
--update	Reuses cache metadata and skips unchanged resources when the server supports it.	Recurring mirrors and archives.
--sitemap	Seeds the crawl from sitemap.xml or a supplied sitemap.	Faster, more complete discovery.
--progress	Shows a Rich terminal progress dashboard when installed.	Long crawls where visibility matters.
--zip-output	Exports the mirror folder as a zip.	Sharing, attaching, or storing snapshots.
--warc-output	Writes a simple WARC response archive.	Archival workflows and future replay tooling.

🔁 What Gets Rewritten

Source	Rewritten for offline use
Page links	<a href> for same-site pages
Images and media	src, data-src, poster, srcset
Stylesheets and icons	<link href> for fetchable resource types
Metadata images	og:image, twitter:image
Inline styles	style="background: url(...)"
CSS files	url(...) and @import
JavaScript files	Common static asset strings like /img/logo.png
External assets	Optional CDN copies under cdn/<domain>/...

When external scripts or stylesheets are localized, the tool removes integrity and crossorigin where needed because those attributes often break offline copies.

📁 Output Example

example_backup/
  index.html
  about.html
  assets/
    site.css
    app.js
  img/
    logo.png
    hero.webp
  fonts/
    inter.woff2
  cdn/
    cdn.example.com/
      library.js

Open index.html in your browser to browse the mirrored copy.

🧑‍💻 Development

pip install -e ".[dev]"
pytest
black . --check
isort . --check-only
ruff check .

Using PyCharm? Open the repo folder, point it at a Python 3.10+ virtualenv, run pip install -e ".[dev]" in the terminal, and use the pytest runner on