Add documentation for all PDF tools

docs/tools/text-color.md

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+---
+title: Change Text Color
+description: Change the color of all text in your PDF to any color you choose.
+---
+
+# Change Text Color
+
+Replace the color of text throughout your PDF. The tool identifies text regions on each page and recolors them to your chosen color while preserving the document layout and non-text content.
+
+## How It Works
+
+1. Upload your PDF file.
+2. Pick a new text color using the color selector. The default is blue (#0000FF).
+3. Click **Change Text Color** to process.
+4. The recolored PDF downloads automatically. A progress indicator shows which page is being processed.
+
+## Options
+
+- **New Text Color** -- A color picker for selecting the replacement color for all text in the document.
+
+## Features
+
+- Recolors text on every page in the document
+- Per-page processing with progress feedback
+- Color picker with full hex color support
+- Preserves page layout and non-text elements
+
+## Use Cases
+
+- Changing black text to dark blue for a softer, more modern document appearance
+- Recoloring text to match brand guidelines before distributing documents
+- Converting text to a specific color for accessibility compliance
+- Making text visible against a newly applied background color
+
+## Tips
+
+- This tool renders pages at 2x scale for quality, then reconstructs the PDF. The output is image-based, so text will no longer be selectable or searchable.
+- For documents where you need to keep selectable text, consider editing the PDF directly with the [PDF Editor](./edit-pdf) instead.
+- Processing time increases with page count since each page is rendered individually.
+
+## Related Tools
+
+- [Background Color](./background-color)
+- [Invert Colors](./invert-colors)
+- [Adjust Colors](./adjust-colors)