Crawl4AI simplifies asynchronous web crawling and data extraction, making it accessible for large language models (LLMs) and AI applications. 🆓🌐
Looking for the synchronous version? Check out README.sync.md. You can also access the previous version in the branch V0.2.76.
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✨ Visit our Documentation Website
- 🆓 Completely free and open-source
- 🚀 Blazing fast performance, outperforming many paid services
- 🤖 LLM-friendly output formats (JSON, cleaned HTML, markdown)
- 🌍 Supports crawling multiple URLs simultaneously
- 🎨 Extracts and returns all media tags (Images, Audio, and Video)
- 🔗 Extracts all external and internal links
- 📚 Extracts metadata from the page
- 🔄 Custom hooks for authentication, headers, and page modifications before crawling
- 🕵️ User-agent customization
- 🖼️ Takes screenshots of the page
- 📜 Executes multiple custom JavaScripts before crawling
- 📊 Generates structured output without LLM using JsonCssExtractionStrategy
- 📚 Various chunking strategies: topic-based, regex, sentence, and more
- 🧠 Advanced extraction strategies: cosine clustering, LLM, and more
- 🎯 CSS selector support for precise data extraction
- 📝 Passes instructions/keywords to refine extraction
- 🔒 Proxy support for enhanced privacy and access
- 🔄 Session management for complex multi-page crawling scenarios
- 🌐 Asynchronous architecture for improved performance and scalability
Crawl4AI offers flexible installation options to suit various use cases. You can install it as a Python package or use Docker.
Choose the installation option that best fits your needs:
For basic web crawling and scraping tasks:
pip install crawl4aiBy default this will install the asynchronous version of Crawl4AI, using Playwright for web crawling.
👉 Note: The standard version of Crawl4AI uses Playwright for asynchronous crawling. If you encounter an error saying that Playwright is not installed, you can run playwright install. However, this should be done automatically during the setup process.
If you need the synchronous version using Selenium:
pip install crawl4ai[sync]For contributors who plan to modify the source code:
git clone https://github.com/unclecode/crawl4ai.git
cd crawl4ai
pip install -e .We're in the process of creating Docker images and pushing them to Docker Hub. This will provide an easy way to run Crawl4AI in a containerized environment. Stay tuned for updates!
For more detailed installation instructions and options, please refer to our Installation Guide.
import asyncio
from crawl4ai import AsyncWebCrawler
async def main():
async with AsyncWebCrawler(verbose=True) as crawler:
result = await crawler.arun(url="https://www.nbcnews.com/business")
print(result.markdown)
if __name__ == "__main__":
asyncio.run(main())import asyncio
from crawl4ai import AsyncWebCrawler
async def main():
async with AsyncWebCrawler(verbose=True) as crawler:
js_code = ["const loadMoreButton = Array.from(document.querySelectorAll('button')).find(button => button.textContent.includes('Load More')); loadMoreButton && loadMoreButton.click();"]
result = await crawler.arun(
url="https://www.nbcnews.com/business",
js_code=js_code,
css_selector="article.tease-card",
bypass_cache=True
)
print(result.extracted_content)
if __name__ == "__main__":
asyncio.run(main())import asyncio
from crawl4ai import AsyncWebCrawler
async def main():
async with AsyncWebCrawler(verbose=True, proxy="http://127.0.0.1:7890") as crawler:
result = await crawler.arun(
url="https://www.nbcnews.com/business",
bypass_cache=True
)
print(result.markdown)
if __name__ == "__main__":
asyncio.run(main())The JsonCssExtractionStrategy allows for precise extraction of structured data from web pages using CSS selectors.
import asyncio
import json
from crawl4ai import AsyncWebCrawler
from crawl4ai.extraction_strategy import JsonCssExtractionStrategy
async def extract_news_teasers():
schema = {
"name": "News Teaser Extractor",
"baseSelector": ".wide-tease-item__wrapper",
"fields": [
{
"name": "category",
"selector": ".unibrow span[data-testid='unibrow-text']",
"type": "text",
},
{
"name": "headline",
"selector": ".wide-tease-item__headline",
"type": "text",
},
{
"name": "summary",
"selector": ".wide-tease-item__description",
"type": "text",
},
{
"name": "time",
"selector": "[data-testid='wide-tease-date']",
"type": "text",
},
{
"name": "image",
"type": "nested",
"selector": "picture.teasePicture img",
"fields": [
{"name": "src", "type": "attribute", "attribute": "src"},
{"name": "alt", "type": "attribute", "attribute": "alt"},
],
},
{
"name": "link",
"selector": "a[href]",
"type": "attribute",
"attribute": "href",
},
],
}
extraction_strategy = JsonCssExtractionStrategy(schema, verbose=True)
async with AsyncWebCrawler(verbose=True) as crawler:
result = await crawler.arun(
url="https://www.nbcnews.com/business",
extraction_strategy=extraction_strategy,
bypass_cache=True,
)
assert result.success, "Failed to crawl the page"
news_teasers = json.loads(result.extracted_content)
print(f"Successfully extracted {len(news_teasers)} news teasers")
print(json.dumps(news_teasers[0], indent=2))
if __name__ == "__main__":
asyncio.run(extract_news_teasers())For more advanced usage examples, check out our Examples section in the documentation.
import os
import asyncio
from crawl4ai import AsyncWebCrawler
from crawl4ai.extraction_strategy import LLMExtractionStrategy
from pydantic import BaseModel, Field
class OpenAIModelFee(BaseModel):
model_name: str = Field(..., description="Name of the OpenAI model.")
input_fee: str = Field(..., description="Fee for input token for the OpenAI model.")
output_fee: str = Field(..., description="Fee for output token for the OpenAI model.")
async def main():
async with AsyncWebCrawler(verbose=True) as crawler:
result = await crawler.arun(
url='https://openai.com/api/pricing/',
word_count_threshold=1,
extraction_strategy=LLMExtractionStrategy(
provider="openai/gpt-4o", api_token=os.getenv('OPENAI_API_KEY'),
schema=OpenAIModelFee.schema(),
extraction_type="schema",
instruction="""From the crawled content, extract all mentioned model names along with their fees for input and output tokens.
Do not miss any models in the entire content. One extracted model JSON format should look like this:
{"model_name": "GPT-4", "input_fee": "US$10.00 / 1M tokens", "output_fee": "US$30.00 / 1M tokens"}."""
),
bypass_cache=True,
)
print(result.extracted_content)
if __name__ == "__main__":
asyncio.run(main())Crawl4AI excels at handling complex scenarios, such as crawling multiple pages with dynamic content loaded via JavaScript. Here's an example of crawling GitHub commits across multiple pages:
import asyncio
import re
from bs4 import BeautifulSoup
from crawl4ai import AsyncWebCrawler
async def crawl_typescript_commits():
first_commit = ""
async def on_execution_started(page):
nonlocal first_commit
try:
while True:
await page.wait_for_selector('li.Box-sc-g0xbh4-0 h4')
commit = await page.query_selector('li.Box-sc-g0xbh4-0 h4')
commit = await commit.evaluate('(element) => element.textContent')
commit = re.sub(r'\s+', '', commit)
if commit and commit != first_commit:
first_commit = commit
break
await asyncio.sleep(0.5)
except Exception as e:
print(f"Warning: New content didn't appear after JavaScript execution: {e}")
async with AsyncWebCrawler(verbose=True) as crawler:
crawler.crawler_strategy.set_hook('on_execution_started', on_execution_started)
url = "https://github.com/microsoft/TypeScript/commits/main"
session_id = "typescript_commits_session"
all_commits = []
js_next_page = """
const button = document.querySelector('a[data-testid="pagination-next-button"]');
if (button) button.click();
"""
for page in range(3): # Crawl 3 pages
result = await crawler.arun(
url=url,
session_id=session_id,
css_selector="li.Box-sc-g0xbh4-0",
js=js_next_page if page > 0 else None,
bypass_cache=True,
js_only=page > 0
)
assert result.success, f"Failed to crawl page {page + 1}"
soup = BeautifulSoup(result.cleaned_html, 'html.parser')
commits = soup.select("li")
all_commits.extend(commits)
print(f"Page {page + 1}: Found {len(commits)} commits")
await crawler.crawler_strategy.kill_session(session_id)
print(f"Successfully crawled {len(all_commits)} commits across 3 pages")
if __name__ == "__main__":
asyncio.run(crawl_typescript_commits())This example demonstrates Crawl4AI's ability to handle complex scenarios where content is loaded asynchronously. It crawls multiple pages of GitHub commits, executing JavaScript to load new content and using custom hooks to ensure data is loaded before proceeding.
For more advanced usage examples, check out our Examples section in the documentation.
Crawl4AI is designed with speed as a primary focus. Our goal is to provide the fastest possible response with high-quality data extraction, minimizing abstractions between the data and the user.
We've conducted a speed comparison between Crawl4AI and Firecrawl, a paid service. The results demonstrate Crawl4AI's superior performance:
Firecrawl:
Time taken: 7.02 seconds
Content length: 42074 characters
Images found: 49
Crawl4AI (simple crawl):
Time taken: 1.60 seconds
Content length: 18238 characters
Images found: 49
Crawl4AI (with JavaScript execution):
Time taken: 4.64 seconds
Content length: 40869 characters
Images found: 89
As you can see, Crawl4AI outperforms Firecrawl significantly:
- Simple crawl: Crawl4AI is over 4 times faster than Firecrawl.
- With JavaScript execution: Even when executing JavaScript to load more content (doubling the number of images found), Crawl4AI is still faster than Firecrawl's simple crawl.
You can find the full comparison code in our repository at docs/examples/crawl4ai_vs_firecrawl.py.
For detailed documentation, including installation instructions, advanced features, and API reference, visit our Documentation Website.
We welcome contributions from the open-source community. Check out our contribution guidelines for more information.
Crawl4AI is released under the Apache 2.0 License.
For questions, suggestions, or feedback, feel free to reach out:
- GitHub: unclecode
- Twitter: @unclecode
- Website: crawl4ai.com
Happy Crawling! 🕸️🚀