Is the rotation absolute or relative?

Relative. The angle is added to whatever the page already had, so rotating by 90 and then by 270 returns the page to where it started.

Can I rotate one page only?

Not in a single call. Split the page out, rotate it, then merge it back. All three are endpoints here.

Does it re-render the page?

No. Only the page's rotation entry changes, so the content is untouched and the file does not grow.

Rotate PDF API

Turn every page by a quarter, a half or three quarters.

Get a free token Full API reference

Endpoint	POST https://astralpdf.com/api/v1/rotate-pdf
Auth	Bearer token, free
Sends	input: base64
Returns	result: base64
option	90 \| 180 \| 270
Price	Free. 1,000 calls a day, 60 a minute.

When to call it

Scanners and phone cameras produce sideways pages, and they produce them consistently, which means the fix can be applied in the same step as the ingest rather than by whoever opens the file next and tilts their head.

For a one-off, the browser version needs no token and never sends your data anywhere: it runs on your own machine.

Example

curl

curl -X POST https://astralpdf.com/api/v1/rotate-pdf \
  -H "Authorization: Bearer ast_YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"input": "JVBERi0xLjcKJYGBgYEK...", "option": "90"}'

response

{
  "tool": "rotate-pdf",
  "result": "JVBERi0xLjcKJWDjz9MKMSAwIG9iago8PC9UeXBlL0NhdGFsb2c...",
  "chars": 1904,
  "ms": 23
}

In your language

JavaScript

const res = await fetch("https://astralpdf.com/api/v1/rotate-pdf", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.ASTRAL_TOKEN}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"input": "JVBERi0xLjcKJYGBgYEK...", "option": "90"}),
});
if (!res.ok) throw new Error((await res.json()).detail);
const { result } = await res.json();

Python

import os, requests

res = requests.post(
    "https://astralpdf.com/api/v1/rotate-pdf",
    headers={"Authorization": f"Bearer {os.environ['ASTRAL_TOKEN']}"},
    json={"input": "JVBERi0xLjcKJYGBgYEK...", "option": "90"},
    timeout=30,
)
res.raise_for_status()
result = res.json()["result"]

Parameters

Field	Type	Notes
input	string	Required. The file, base64 encoded. A data: URL is accepted too. Up to 6,000,000 characters per call.
option	string	One of: 90, 180, 270.

Errors

Errors are RFC 7807 problem documents with a stable type you can branch on.

missing-token	401	No Authorization header.
bad-request	400	input missing or the wrong type.
bad-option	400	option is not one of the listed values.
tool-failed	422	The input could not be processed. detail says why.
quota-exceeded	429	Past 1,000 calls today.

Questions

Is the rotation absolute or relative?: Relative. The angle is added to whatever the page already had, so rotating by 90 and then by 270 returns the page to where it started.
Can I rotate one page only?: Not in a single call. Split the page out, rotate it, then merge it back. All three are endpoints here.
Does it re-render the page?: No. Only the page's rotation entry changes, so the content is untouched and the file does not grow.

Other endpoints

A token takes thirty seconds

Free, no card, 1,000 calls a day, and the same token works on astraltext.com, astralpdf.com, astraljson.com and astralbatch.com.

Get a free token