--- title: "Is an e-signature on a work order valid? | attendo" description: "What an electronic signature on a work order is really worth, what backs it up in a dispute and when you need an advanced or qualified signature instead." url: "https://attendo.me/en/blog/are-electronic-signatures-on-work-orders-valid" lang: "en" --- # Does the customer’s signature on the technician’s phone hold up? It is one of the questions that comes up most when work orders go digital, and one of the worst answered. Some say “of course” without any nuance; others simply do not know. An honest answer has to separate three things. - By the attendo team - Published September 27, 2026 - 4 min read **In this article** 1. What the law says, in short 2. What “simple” means in practice 3. What backs up a simple signature 4. What it is good for, and what it is not 5. The usual mistake 6. What to ask your software vendor ## What the law says, in short In the United States, the federal ESIGN Act and state laws based on UETA share one principle. A signature cannot be denied legal effect just because it is electronic. There are no levels: what matters is that the person meant to sign, agreed to do business electronically and that the signature is tied to the record. In the European Union, where attendo is based, the eIDAS regulation defines three levels: | Type | What it is | Typical example | | --- | --- | --- | | **Simple** | Data in electronic form that the signer uses to sign | A signature drawn on a phone screen, with its record | | **Advanced** | Uniquely linked to the signer, identifies them and detects later changes | A signature with a digital certificate | | **[Qualified](https://attendo.me/en/glossary/qualified-electronic-signature)** | Advanced, with a qualified certificate, created on a qualified device | A national electronic ID or a certificate from a qualified provider | **A signature drawn on a phone screen is a simple electronic signature.** That is the starting point, and it is worth saying clearly. ## What “simple” means in practice It does not mean “worthless.” On both sides of the Atlantic, an electronic signature cannot be rejected as evidence just because it is electronic. What changes is **who has to prove what** if there is a dispute. In Europe, a qualified signature is equivalent to a handwritten one. With a simple signature, if the customer denies signing, it is up to you to show that they did. That is where everything around the signature matters. ## What backs up a simple signature A signature drawn on a screen, on its own, is weak. Backed by a complete record, it is much stronger: - **Timestamp** of the exact moment of signing. - **Who signed:** name and, if possible, job title or an ID. - **Who collected the signature:** the technician, identified. - **Location** at the time of signing. - **Locked content:** the work order cannot be changed afterwards. - **Evidence:** photos of the job, with their time. - **Audit trail:** who created the document, who changed it and when. - **A copy for the customer** on the spot, by email. Together, these turn “a squiggle on a screen” into reasonable evidence that the customer accepted the work. ## What it is good for, and what it is not **It is good for** showing the customer accepted the work, supporting the invoice and documenting that a maintenance contract was fulfilled. That is how the industry normally uses it. **It falls short when** the document is a contract with significant obligations or a regulation requires a specific type of signature. The same goes when the amount is large enough to justify a lawsuit. Then you want an advanced or qualified signature from a trust service provider. ## The usual mistake Assuming that “a digital signature is worth the same as a handwritten one” and forgetting about it. A handwritten signature on paper can be disputed too. The difference is that a digital record keeps much more information around it. There is a bigger mistake: thinking the signature is what matters most. In a dispute with a customer, time-stamped photos often carry more weight than the signature itself. ## What to ask your software vendor 1. What exactly is recorded at the moment of signing? 2. Is the document locked after it is signed? Can it be changed afterwards? 3. Is there a record of who changed what, and when? 4. Does the customer get their copy on the spot? 5. If a document needs an advanced or qualified signature, how is that handled? For most work orders, a well-recorded simple signature is enough, and it is a big step up from paper. The rest need something else. It pays to know which documents those are before a problem shows up, and to confirm it with your legal advisor. Last updated: September 27, 2026 ## How attendo handles it In attendo, each inspection is recorded with date, time, author, location, photos and signature, and the document is locked when it is closed. The customer receives the PDF by email. For quotes and contracts, attendo eSign offers advanced or qualified signatures, sealed by a qualified provider. Which level each document needs is for your legal advisor to confirm. - [attendo Field Service](https://attendo.me/en/field-service) - [attendo eSign](https://attendo.me/en/modules/esign) - [attendo Checklist](https://attendo.me/en/modules/checklists) ## More on field service ### How to go digital with work orders without your team pushing back The problem with paper work orders is not the paper. It is that they arrive late, incomplete and without evidence, and nothing gets billed until they do. Many projects to digitize them fail, almost always for the same five reasons. 4 min read ### How to design a checklist technicians actually fill in A checklist ticked without looking is worse than no checklist at all. It takes time, creates paperwork and gives confidence nobody has earned. And the culprit is almost never the technician: it is the design. 4 min read Processes and compliance ### Periodic controls: how to prove they were done Doing a control and being able to prove it are two different jobs. The second one usually surfaces on audit day, when someone spends a week hunting for emails, screenshots and signatures. 4 min read [All blog articles](https://attendo.me/en/blog) ## Shall we look at it with your operation? Tell us how you work today and we will show you attendo with your own data. If it is not a fit, we will say so. - With your operation, not a generic demo - A real person from our team replies - No cold calls afterwards Would you rather talk first? - Phone [+34 910 053 530](tel:+34910053530) - Email [sales@attendo.me](mailto:sales@attendo.me) - Monday to Thursday 9:30 AM to 6:30 PM and Friday 9:30 AM to 2:30 PM (Spain time)