Documents you sign every day
- Engagement letters and service proposals
- Accounting service contracts
- Financial statements and balances for approval
- Authorizations and powers of attorney
How Accountants use it
Before the first meeting
You send the engagement letter by email with your fee proposal. The client signs it before ever sitting down in your office.
During the month's work
Every financial statement, reconciliation or authorization you need approved goes out with a signing link in seconds, no appointment needed.
When you close the file
You download the PDF with its signing certificate attached and file it alongside the rest of the client's records, ready for any review.
Before and after Firmiu
Why choose Firmiu
Close clients faster
Clients sign from their phone in seconds; you start working the same day.
Full audit trail
Every signature stores IP, date, device and verification — perfect for your professional records.
No paper, no printer
Forget printing, signing, scanning and resending. Everything stays digital and tidy.
How Firmiu works
Upload your PDF
Upload the document and enter the name and email of the person who must sign.
The signer receives a link
They get an email with a unique link and a verification code.
Signed document
The PDF is signed with its audit trail, ready to download.
Frequently asked questions
- Are my clients' signatures legally valid?
- Electronic signatures are legally recognized across Latin America, Spain and the US for most private agreements, and Firmiu adds an audit trail that backs every document. Specific validity depends on the country and document type.
- Can I send several documents to the same client?
- Yes. You can send as many documents as your plan allows and reuse your saved contacts.
- Does the client need to create an account?
- No. They get a unique link by email and sign directly, without signing up.
- Can I reuse the same engagement letter for different clients?
- Yes. You save your contacts in Firmiu and send the same document type to each new client without retyping their details.
- Does it work for partners of a company signing together?
- Yes. You can add up to 5 signers to the same document and choose whether they sign all at once or in a specific order.
- Can I send several documents as a single package?
- Yes. You can merge multiple PDFs (engagement letter, annexes, authorizations) into a single document before sending it for signature.
Guide reviewed and updated: July 2026.
Electronic signatures in your country
Related guides
How much does electronic signature cost?
The price of signing documents online varies a lot. Here's what it depends on and how to start at no cost.
How to sign a service agreement online
The service agreement is what kicks off every project. Learn to sign it online and start working the same day.
What documents can you sign electronically
Electronic signatures work for far more documents than you'd think. Here are the most common ones and the exceptions.
Digital signatures for other professions
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