Remove signatures

Strip digital signatures from a PDF — useful when a signed document needs further editing, which would otherwise invalidate the signature anyway.

At a glance

MCP tool	remove_signatures
HTTP endpoint	POST /v1/signatures/remove
Price	$0.05
Input	One signed PDF
Output	The PDF with digital signatures removed

Parameters

Parameter	Type	Required	Description
file	file	yes	Source PDF.

MCP example

Remove the digital signatures from https://example.com/signed.pdf.

{
  "file": "https://example.com/signed.pdf"
}

HTTP example

curl

curl -i -X POST https://api.pdfasyougo.com/v1/signatures/remove \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <base64-encoded-payment-payload>" \
  -d '{"file":"https://example.com/signed.pdf"}'

TypeScript

import { wrapFetchWithPayment } from 'x402-fetch';
import { privateKeyToAccount } from 'viem/accounts';

const account = privateKeyToAccount(process.env.X402_WALLET_PRIVATE_KEY as `0x${string}`);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay('https://api.pdfasyougo.com/v1/signatures/remove', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ file: 'https://example.com/signed.pdf' }),
});
console.log((await res.json()).output.url);

Response

{
  "output": {
    "url": "https://files.pdfasyougo.com/o/f0c6…?token=…",
    "expires_at": "2026-06-29T12:00:00Z",
    "pages": 5,
    "bytes": 52224
  },
  "operation": "signatures.remove",
  "cost": "0.05 USDC"
}

Notes

• Removes digital signature objects from the document; the visible page content is preserved.
• If the file has no signatures, the operation returns the document unchanged.

Caution

Removing a signature discards the cryptographic proof of who signed and that the document was unchanged since. Only do this when you intend to revise or re-sign the document, and keep the original if you need to retain the signed record.