---
name: "pdf123-scale-pages"
description: "Change the page size of a PDF. Runs the PDF123 \"Adjust page-scale\" tool (pdf123.xyz) over its REST API with curl, no account needed. Use when the user wants this done to their file. Also known as: 缩放页面, Cambiar escala de página, पृष्ठ आकार बदलें, تحجيم الصفحات, Redimensionar páginas, Ubah skala halaman, Ajuster l'échelle des pages, Масштаб страниц, ページサイズの変更, Seiten skalieren, 페이지 크기 변경, Đổi khổ trang, Sayfa ölçeğini ayarla, 縮放頁面, Scala le pagine, ปรับขนาดหน้า, Zmień skalę stron, Масштаб сторінок, Pagina's schalen, Laraskan skala halaman, Skala sidor, Αλλαγή κλίμακας σελίδας, Промяна на мащаба, Canvia l'escala, Badilisha ukubwa wa ukurasa."
compatibility: "Needs curl 7.76+ and outbound HTTPS to pdf123.xyz, or PDFX_API_BASE pointing at a self-hosted pdfx-server."
---

# Adjust page-scale (PDF123)

Change the page size of a PDF.

Web version: https://pdf123.xyz/scale-pages · All tools: https://pdf123.xyz/skills/pdf123.md

## When to use

- Force every page into A4 boxes for a picky uploader
- Map LETTER scans into A4 for a European portal
- Accept stretching when the alternative is rejection

## Run it

Replace the sample file names and values with the user's, then run:

```bash
API="${PDFX_API_BASE:-https://pdf123.xyz}"
curl -sS --fail-with-body -X POST "$API/api/v1/general/scale-pages" \
  -F "fileInput=@input.pdf" \
  -F "pageSize=A4" \
  --output-dir "pdf123-output/$(date +%Y%m%d-%H%M%S)" --create-dirs -OJ -w '%{filename_effective} %{content_type}\n'
```

## Inputs

Everything is `multipart/form-data`. The command above already sends each field with its default; keep them all and change only the values the user asked for, since some endpoints reject a missing optional field.

| Field | Type | Required | Default | Notes |
| --- | --- | --- | --- | --- |
| `fileInput` | file | yes | | .pdf (one file) |
| `pageSize` | choice | no | `A4` | Page size. One of: `A0` (A0), `A1` (A1), `A2` (A2), `A3` (A3), `A4` (A4), `A5` (A5), `A6` (A6), `LETTER` (Letter), `LEGAL` (Legal) |

## Result

curl saves the result in a new `pdf123-output/<timestamp>/` directory under the server's file name and prints its path and content type. Several output files come back as one ZIP. Tell the user where the file is.

## Limits

- No uniform scaleFactor
- Does not preserve aspect ratio
- Page rotation flags and a non-zero page origin are not accounted for; content is scaled from (0,0)
- Upload limit on this website: 500 MB per file, sent in chunks above about 95 MB. A single direct API request body is capped at 100 MB.

## Errors

- A non-zero curl exit means the request failed. The saved file then holds `application/problem+json`; read it and report its `detail` to the user instead of retrying blindly.
- `413`: the upload exceeds 100 MiB. `429`: wait for `Retry-After` seconds, then retry once.
- Send `X-API-KEY: $PDFX_API_KEY` only if the user has a PDF123 API key; anonymous calls work without it.

## Privacy

Files are uploaded to the API host, processed, and deleted once the response is sent. For confidential files, ask before uploading, or use a self-hosted server via `PDFX_API_BASE`.