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SnapOtter/apps/docs/tools/pdf/merge-pdf.md
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SnapOtter d24e244af4 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).
2026-06-18 14:12:28 +08:00

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---
description: Combine multiple PDFs into a single document.
---
# Merge PDFs
Combine two or more PDF files into a single document, preserving the page order of each input file.
## API Endpoint
`POST /api/v1/tools/pdf/merge-pdf`
Accepts multipart form data with two or more PDF files. No `settings` field is required.
## Parameters
This tool has no settings parameters. Simply upload two or more PDF files.
| Constraint | Value |
|------------|-------|
| Minimum files | 2 |
| Maximum files | 20 |
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/pdf/merge-pdf \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@document1.pdf" \
-F "file=@document2.pdf" \
-F "file=@document3.pdf"
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/merged.pdf",
"originalSize": 4500000,
"processedSize": 4200000
}
```
## Notes
- Files are merged in the order they are uploaded.
- At least two PDF files are required; the request will fail with a 400 error if fewer are provided.
- The maximum number of input files is 20.
- Encrypted PDFs must be unlocked before merging.