NotChanged

Try NotChanged in 30 seconds

We issued a sample payslip from Demo Payroll Ltd, a demo issuer at the verified platform tier, through the live signing API. Then we made a copy and changed the net pay. Download both and check them yourself.

Expected: Genuine

Signed payslip

Exactly as issued: QR badge, embedded signed record, untouched.

Download signed-payslip.pdf

Expected: Altered

Tampered payslip

Same file, but the net pay was edited with an incremental PDF update. It still looks official.

Download tampered-payslip.pdf

Now verify them

  1. Open the verify page and drop in each file.
  2. Or scan the QR code on the payslip with your phone to see the issuance record.
  3. Try any other PDF too. It will come back Not found.
curl -sO https://notchanged.com/demo/tampered-payslip.pdf
curl -s -X POST https://notchanged.com/api/v1/verify -F "file=@tampered-payslip.pdf"
# => "status": "ALTERED"

The sample payslip is fictional and clearly marked SAMPLE. Demo Payroll Ltd is not a real company.