Ambill Sign · Free bulk digital signing
Sign hundreds of invoices in one go, free, with your company's own certificate
Upload your organisation's signing certificate once. Then pick your documents, enter the certificate password and sign the whole batch in minutes. No USB token and no signing one PDF at a time. Every signed document carries a short verification link anyone can open to confirm who signed it and when.
- Free: no per-document fees
- Your certificate, encrypted at rest
- Ambill is SOC 1 Type II certified
- Works with any PDF
Signing is still the slowest step in sending an invoice
In most finance teams the process looks like this. Someone generates invoices or statements, plugs in a USB signing token, opens each PDF, signs it, saves it, attaches it to an email and repeats.
At 20 documents a month that's a chore. At 2,000 it's a full-time job, and it can stop dead when the token is at someone's desk, the person holding the PIN is on leave, or the token driver breaks after an update.
Automated signing has existed for years, but mostly for companies with the volume and the budget to build it. Everyone else still signs by hand.
One PDF at a time
Manual signing grows with every invoice you raise. It doesn't scale with the business.
Tied to a USB token
Signing only happens where the token and its PIN are.
No trail
Who signed what, and when? Usually buried in someone's sent folder.
How it works
From certificate to signed batch in four steps
Get your organisation's signing certificate
Buy a Document Signer Certificate (a
.pfxfile) from one of our certificate partners. They handle the KYC and paperwork. We help you pick the right one.Already have one? Skip ahead.
Upload it to Ambill once
Your certificate is encrypted the moment it arrives. We never store its password. Ambill shows you the issuer, the serial number and the expiry date.
Select documents and sign them in bulk
Upload PDFs or pick invoices already in Ambill, choose where the signature goes, enter your certificate password and sign the whole batch. Hundreds of documents at once, with live progress. Download the signed files individually or all together.
Recipients verify with one link
Every signed document carries a short verification link in its signature stamp. Your customer's finance team opens it and sees who signed it, when, and whether the certificate was valid. They don't need to log in.
Coming soon: sign automatically whenever an invoice is generated, and a signing API for your ERP.
Features
Built for finance teams that sign at volume
Bulk signing
Sign hundreds of documents in one go. Enter your certificate password once per batch, not once per file.
Verification link
Each signed PDF carries a short printed verification link to a public page showing the signer, the time of signing and the certificate's validity. No second QR code to clash with your e-invoice IRN QR, and fewer "is this genuine?" emails.
Audit trail
Every certificate upload, signing batch and signed document is logged: who, what, when, and with which certificate.
Certificate expiry alerts
We warn you 30, 15 and 7 days before your certificate expires, and point you to a partner to renew it.
Works with Ambill invoices and any PDF
Sign invoices generated in Ambill, or upload any business PDF: statements, credit notes, TDS certificates, letters, contracts.
Signature placement
Put the visible signature bottom-right or bottom-left on the last page, or make it invisible.
Coming soonAuto-sign
Opt in to have invoices signed the moment they're generated.
Coming soonSigning API
Sign documents straight from your ERP or product.
Security
Your signing certificate is the most sensitive file you own. We treat it that way.
A signing certificate lets someone sign on behalf of your company. Here's how we protect yours.
Encrypted at rest.
Certificates are encrypted with AES-256-GCM, using per-file keys protected by AWS Key Management Service (envelope encryption).
Password never stored.
You enter the certificate password each time you sign a batch. It's used in memory for that batch and then discarded.
Strict tenant isolation.
Your certificate and documents are only reachable from your organisation's account.
Role-based access.
Choose which users can view documents and which can sign.
Full audit trail.
Every upload, signing run and download is logged.
Audited controls.
Ambill is SOC 1 Type II certified.
Who it's for
Made for teams that send a lot of documents
Finance and AR teams
Raise hundreds or thousands of invoices, credit notes or statements a month.
Real estate, co-working and leasing
Monthly rent, CAM and lease invoices across many tenants.
Distributors and manufacturers
High-volume dealer invoicing and account statements.
Anyone issuing TDS certificates
Sign Form 16A and other certificates in bulk each quarter.
CA and accounting firms
Recommend it to clients who sign large volumes.
Sign only a handful of documents a month? Your USB token is probably fine. Ambill Sign is built for volume.
Don't have a signing certificate yet? Our partners will sort it out.
Ambill doesn't sell certificates. Our certificate partners do, and they handle the KYC, the documentation and the issuance. Ask for a Document Signer Certificate in .pfx format and you can be signing on Ambill soon after it's issued.
FAQ
Frequently asked questions
Stop signing one PDF at a time
Bring your certificate and sign your next batch of invoices free. Don't have a certificate yet? We'll connect you with a partner today.