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: Shrink PDF file size by compressing embedded images.
+---
+
+# Compress PDF
+
+Reduce PDF file size by downsampling embedded images. Choose between a quality slider or a target file size.
+
+## API Endpoint
+
+`POST /api/v1/tools/pdf/compress-pdf`
+
+Accepts multipart form data with a PDF file and a JSON `settings` field.
+
+## Parameters
+
+| Parameter | Type | Required | Default | Description |
+|-----------|------|----------|---------|-------------|
+| mode | string | No | `"quality"` | Compression mode: `quality` or `targetSize` |
+| quality | integer | No | - | Compression quality, 1-100 (higher = less compression). Used in `quality` mode |
+| targetSizeKb | number | No | - | Target file size in kilobytes. Used in `targetSize` mode |
+
+## Example Request
+
+Compress by quality:
+
+```bash
+curl -X POST http://localhost:1349/api/v1/tools/pdf/compress-pdf \
+  -H "Authorization: Bearer si_your-api-key" \
+  -F "file=@document.pdf" \
+  -F 'settings={"mode": "quality", "quality": 60}'
+```
+
+Compress to a target size:
+
+```bash
+curl -X POST http://localhost:1349/api/v1/tools/pdf/compress-pdf \
+  -H "Authorization: Bearer si_your-api-key" \
+  -F "file=@document.pdf" \
+  -F 'settings={"mode": "targetSize", "targetSizeKb": 500}'
+```
+
+## Example Response
+
+```json
+{
+  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/document.pdf",
+  "originalSize": 5200000,
+  "processedSize": 1800000
+}
+```
+
+## Notes
+
+- In `quality` mode, lower values produce smaller files with more image degradation.
+- In `targetSize` mode, a binary search finds the highest DPI that fits the requested size.
+- If compression would enlarge the file, the original bytes are returned unchanged.
+- Text and vector content are not affected; only embedded raster images are downsampled.