Add contributor and docs for force_viewport_screenshot feature

- Add TheRedRad to CONTRIBUTORS.md for PR #1694
- Document force_viewport_screenshot in API parameters reference
- Add viewport screenshot note in browser-crawler-config guide
- Add viewport-only screenshot example in screenshot docs

CONTRIBUTORS.md

@@ -23,6 +23,7 @@ We would like to thank the following people for their contributions to Crawl4AI:
 - [HamzaFarhan](https://github.com/HamzaFarhan) - Handled the cases where markdown_with_citations, references_markdown, and filtered_html might not be defined [#293](https://github.com/unclecode/crawl4ai/pull/293)
 - [NanmiCoder](https://github.com/NanmiCoder) - fix: crawler strategy exception handling and fixes [#271](https://github.com/unclecode/crawl4ai/pull/271)
 - [paulokuong](https://github.com/paulokuong) - fix: RAWL4_AI_BASE_DIRECTORY should be Path object instead of string [#298](https://github.com/unclecode/crawl4ai/pull/298)
+- [TheRedRad](https://github.com/theredrad) - feat: add force viewport screenshot option [#1694](https://github.com/unclecode/crawl4ai/pull/1694)
 
 #### Feb-Alpha-1
 - [sufianuddin](https://github.com/sufianuddin) - fix: [Documentation for JsonCssExtractionStrategy](https://github.com/unclecode/crawl4ai/issues/651)

docs/examples/full_page_screenshot_and_pdf_export.md

@@ -56,5 +56,41 @@ if __name__ == "__main__":
 - If `screenshot=True`, and a PDF is already available, it directly converts the first page of that PDF to an image for you—no repeated loading or scrolling.
 - Finally, you get your PDF and/or screenshot ready to use.
 
+---
+
+## Viewport-Only Screenshots
+
+If you only need a screenshot of the visible viewport (not the entire page), use the `force_viewport_screenshot` option. This is significantly faster and produces smaller images, especially for long pages.
+
+```python
+import os
+import asyncio
+from base64 import b64decode
+from crawl4ai import AsyncWebCrawler, CrawlerRunConfig
+
+async def main():
+    async with AsyncWebCrawler() as crawler:
+        result = await crawler.arun(
+            url='https://en.wikipedia.org/wiki/List_of_common_misconceptions',
+            config=CrawlerRunConfig(
+                screenshot=True,
+                force_viewport_screenshot=True  # Only capture the visible viewport
+            )
+        )
+
+        if result.success and result.screenshot:
+            with open("viewport_screenshot.png", "wb") as f:
+                f.write(b64decode(result.screenshot))
+            print("Viewport screenshot saved!")
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```
+
+**When to use viewport-only screenshots:**
+- You only need what's visible above the fold
+- You want faster screenshot capture on long pages
+- You need smaller image sizes for thumbnails or previews
+
 **Conclusion:**
 With this feature, Crawl4AI becomes even more robust and versatile for large-scale content extraction. Whether you need a PDF snapshot or a quick screenshot, you now have a reliable solution for even the most extensive webpages.

docs/md_v2/api/parameters.md

@@ -174,6 +174,7 @@ If your page is a single-page app with repeated JS updates, set `js_only=True` i
 | **`screenshot`**                           | `bool` (False)      | Capture a screenshot (base64) in `result.screenshot`.                                                     |
 | **`screenshot_wait_for`**                  | `float or None`     | Extra wait time before the screenshot.                                                                    |
 | **`screenshot_height_threshold`**          | `int` (~20000)      | If the page is taller than this, alternate screenshot strategies are used.                                |
+| **`force_viewport_screenshot`**            | `bool` (False)      | If `True`, always captures a viewport-only screenshot regardless of page height. Faster and smaller than full-page screenshots. |
 | **`pdf`**                                  | `bool` (False)      | If `True`, returns a PDF in `result.pdf`.                                                                 |
 | **`capture_mhtml`**                        | `bool` (False)      | If `True`, captures an MHTML snapshot of the page in `result.mhtml`. MHTML includes all page resources (CSS, images, etc.) in a single file. |
 | **`image_description_min_word_threshold`** | `int` (~50)         | Minimum words for an image's alt text or description to be considered valid.                              |

docs/md_v2/core/browser-crawler-config.md

@@ -262,6 +262,7 @@ class CrawlerRunConfig:
 8.⠀**`screenshot`**, **`pdf`**, & **`capture_mhtml`**:
    - If `True`, captures a screenshot, PDF, or MHTML snapshot after the page is fully loaded.
    - The results go to `result.screenshot` (base64), `result.pdf` (bytes), or `result.mhtml` (string).
+   - Use `force_viewport_screenshot=True` to capture only the visible viewport instead of the full page. This is faster and produces smaller images when you don't need a full-page screenshot.
 
 9.⠀**Location Parameters**:  
    - **`locale`**: Browser's locale (e.g., `"en-US"`, `"fr-FR"`) for language preferences