docs: organize tool pages by modality under /tools/<modality>/

Move all 157 tool pages into image/video/audio/pdf/data subfolders so URLs read /tools/<modality>/<id> (e.g. /tools/image/crop). Nest the image sub-categories under an Image group in the sidebar so the nav reads by modality. Add public/_redirects (301, clean + .html forms) mapping every old flat /tools/<id> URL to its new path so inbound links keep working. Rewrite all internal /tools links. Verified with a clean docs build (no dead links).
2026-08-03 07:46:42 +02:00 · 2026-06-18 14:12:28 +08:00
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+---
+description: Crop an image to a centered circle with transparent corners.
+---
+
+# Circle Crop
+
+Crop an image to a centered circle with transparent corners. Supports adjustable zoom, offset, border, and output size.
+
+## API Endpoint
+
+`POST /api/v1/tools/image/circle-crop`
+
+Accepts multipart form data with an image file and a JSON `settings` field.
+
+## Parameters
+
+| Parameter | Type | Required | Default | Description |
+|-----------|------|----------|---------|-------------|
+| zoom | number | No | `1` | Zoom factor (1-5); higher values crop tighter |
+| offsetX | number | No | `0.5` | Horizontal center position (0-1) |
+| offsetY | number | No | `0.5` | Vertical center position (0-1) |
+| borderWidth | integer | No | `0` | Border width in pixels (0-200) |
+| borderColor | string | No | `"#ffffff"` | Border hex color |
+| background | string | No | `"transparent"` | Corner fill: `"transparent"` or a hex color |
+| outputSize | integer | No | - | Final square dimension in pixels (16-4096) |
+
+## Example Request
+
+```bash
+curl -X POST http://localhost:1349/api/v1/tools/image/circle-crop \
+  -H "Authorization: Bearer si_your-api-key" \
+  -F "file=@photo.jpg" \
+  -F 'settings={"zoom": 1.2, "borderWidth": 4, "borderColor": "#333333"}'
+```
+
+## Example Response
+
+```json
+{
+  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/photo.png",
+  "originalSize": 2450000,
+  "processedSize": 185000
+}
+```
+
+## Notes
+
+- Output is always PNG to preserve the transparent corners (unless `background` is set to a solid color).
+- The circle is inscribed within the shorter dimension of the image. Use `zoom` to crop tighter and `offsetX`/`offsetY` to shift the visible area.
+- When `outputSize` is provided, the result is resized to that square dimension after cropping.
+- HEIC, RAW, PSD, and SVG inputs are automatically decoded before processing.