Add documentation for all PDF tools

docs/tools/webp-to-pdf.md

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+---
+title: WebP to PDF
+description: Convert WebP images to PDF format directly in your browser with adjustable compression quality.
+---
+
+# WebP to PDF
+
+Convert Google's WebP image format to PDF. This is particularly useful when you have downloaded images from the web that are in WebP format and need them in a more universally accepted format for printing or sharing.
+
+## Supported Formats
+
+| Format | Extensions |
+| :----- | :--------- |
+| WebP   | `.webp`    |
+
+## How It Works
+
+1. Click the upload area or drag and drop your WebP files.
+2. Review the file list and remove any files you do not need.
+3. Select a **PDF Quality** level.
+4. Click **Convert to PDF**. The output downloads as `from_webps.pdf`.
+
+Internally, each WebP image is decoded through the browser's canvas API, then embedded in the PDF using pdf-lib. This means the conversion works on any browser that supports WebP decoding (all modern browsers do).
+
+## Options
+
+**PDF Quality** controls compression when embedding images:
+
+- **High Quality** -- preserves the most detail.
+- **Medium Quality** (default) -- balanced output.
+- **Low Quality** -- smallest file size.
+
+## Use Cases
+
+- Converting web-downloaded images saved as WebP into a printable PDF
+- Packaging WebP screenshots from Chrome or Edge into documentation
+- Creating a PDF portfolio from images exported by design tools that default to WebP
+- Archiving WebP images in a more universally readable format
+
+## Tips
+
+- WebP is decoded to PNG internally before PDF embedding, so lossless WebP images retain their quality at the High setting.
+- If you have a mix of WebP and other image formats, use the [Images to PDF](./image-to-pdf) tool instead -- it accepts everything in one go.
+
+## Related Tools
+
+- [Images to PDF](./image-to-pdf)
+- [PNG to PDF](./png-to-pdf)
+- [JPG to PDF](./jpg-to-pdf)