These Terms govern the purchase and use of the Signater platform by Customers and their Users: plans and envelopes, billing and cancellation, responsibilities, and the legal validity of electronic signatures.
Last updated on August 30, 2026
These Terms of Service ("Terms") govern the purchase and use of the Signater platform by Customers and their Users. By creating an account, accessing or using the Platform, you confirm that you have read, understood and agreed to these Terms. If you do not agree to them, do not use the Platform.
The following documents are incorporated into these Terms by reference: the Privacy Policy, the Data Processing Agreement (DPA), the AI Terms and, where they apply to your relationship with Signater, the Terms for Signers and the Affiliate Program Terms and the Reseller Program Terms. All of Signater's legal documents are collected in the Legal Center.
In these Terms, the following capitalized terms have the meanings set out below:
2.1 These Terms are entered into between you and the Signater entity that corresponds to your account's jurisdiction:
In these Terms, "Signater" means the contracting entity that applies to your account.
2.2 The account's jurisdiction is determined by the country the Customer provides when creating or initially setting up the account, and it also determines the applicable billing currency and payment processor. The two entities belong to the same corporate group and operate the Platform together.
2.3 The Platform is intended for persons who are at least 18 years old and have full legal capacity. By accepting these Terms you confirm that you meet this requirement. If you accept these Terms on behalf of a legal entity, you represent and warrant that you have authority to bind it, and references to "Customer" and "you" refer to that entity.
Signater provides an electronic-signature and Document-management platform delivered as a service (SaaS), accessible over the internet. Signater may improve, modify, add or discontinue Platform features at any time, and will seek to preserve the core functionality of the subscribed Plan during the current billing cycle.
The Platform is offered under the Free, Starter, Business and Enterprise Plans. The features, limits and prices of each Plan are those described on the pricing page, which is Signater's binding commercial catalog and prevails over any other material for contracting purposes.
Paid Plans include unlimited Users at no per-User charge. The Free Plan includes 3 (three) Envelopes per month and 1 (one) User, with no credit card required; Signater may limit the Free Plan to one account per User.
Feature availability may vary by Plan and by country. Certain identity-validation and message-delivery channels are specific to particular markets — notably the Brazilian market — and may not be available elsewhere.
The Envelope is the Platform's unit of consumption. An Envelope is deducted from the Customer's balance only when it is first published; subsequent publications of the same Envelope do not trigger a new deduction.
In addition to the Envelopes included in the Plan, the Customer may purchase, as offered in the current catalog:
Plan variants with unlimited Envelopes do not offer Additional or One-time Envelopes. The Free Plan does not allow the purchase of Additional or One-time Envelopes.
The integration API and webhooks are included from the Business Plan upward. Envelopes created through the API draw on the same Envelope balance as the rest of the Plan, with no separate pool or extra charge.
4.1 To use the Platform, the Customer must create an account with truthful, complete and up-to-date information, and keep it that way for as long as the relationship lasts. Signater may refuse, suspend or close accounts registered with false information or in breach of these Terms.
4.2 The Customer is responsible for safeguarding and using its account credentials, including passwords and API tokens, and for everything done with them. The Customer is liable to Signater for the acts and omissions of its Users as if they were its own.
4.3 The Platform offers two-factor authentication (2FA), which each User may enable on their profile and which the Customer may, depending on the Plan, enforce account-wide. Signater recommends enabling 2FA.
4.4 Signater may require, at any time, security and anti-fraud checks — such as captcha challenges, e-mail confirmation or additional identity verification — as a condition for accessing or using certain features.
4.5 The Customer must immediately notify Signater at [email protected] of any unauthorized use of its account or any security incident of which it becomes aware.
Paid Plans renew automatically at the end of each cycle (monthly or annual) for the same period, until the Customer cancels the subscription as described in Section 6.
On annual Plans, the full amount for the period — including any Additional Envelopes subscribed for the year — is charged upfront in a single payment, and all of the period's Envelopes are credited at once at the start of the cycle.
Upgrades take effect immediately: the new Plan is charged in full at the time of the change and a new billing cycle starts, with no prorated credit for the remainder of the previous Plan. Downgrades take effect at the start of the next billing cycle. Changes to the quantity of Additional Envelopes take effect in the next cycle.
Monthly billing is paid by credit card. Annual billing is paid by credit card or, for Customers billed in Brazilian reais, by boleto. Payments are handled by payment processors engaged by Signater; full card details are collected and processed directly by the processor, and Signater does not store them.
For Brazilian Customers, Signater issues the Brazilian electronic service invoice (NFS-e) based on the tax information the Customer provides on the Platform. The Customer is responsible for keeping its tax information complete and up to date; missing or incorrect information may prevent or delay the issuance of tax documents.
Signater may change the prices of Plans and Envelopes upon 30 (thirty) days' prior notice, by e-mail or through a notice on the Platform. Price changes may reflect, among other factors, inflation, exchange-rate variation, technology costs and feature expansion. Continued use of the Platform after the notice period ends constitutes acceptance of the new prices. If you do not agree with a price change, you may cancel your Plan before the next renewal at no additional cost.
If a payment fails, Signater may retry the charge and notify the Customer. If the failure persists, Signater may suspend account features and cancel the subscription, in which case the account is moved to the Free Plan as described in Section 6.1. Signater may also make a new subscription conditional on the settlement of outstanding amounts.
The Customer may cancel its Plan at any time, directly in the Platform dashboard, with no penalty. Cancellation stops automatic renewal; access to the subscribed Plan remains available until the end of the period already paid for. When that period ends, the account is automatically moved to the Free Plan, keeping access to the Platform and to the Customer's Documents, subject to the Free Plan's limits and to the effects described in Section 19.
Except as provided in Section 6.3 and where required by law, payments are non-refundable once the billing cycle has started, and annual Plans are not eligible for partial refunds on early cancellation.
Where mandatory consumer-protection law grants you a cooling-off or withdrawal right — for example, article 49 of the Brazilian Consumer Protection Code, which allows Brazilian consumers (individuals contracting as end recipients) to withdraw from their first purchase of a paid Plan within 7 (seven) calendar days, with a full refund through the original payment method — Signater will honor that right. To exercise it, contact us through the support chat on the Platform or write to [email protected]. Statutory withdrawal rights apply to the first purchase of a paid Plan and do not extend to subsequent renewals unless the applicable law provides otherwise.
7.1 Customer Content belongs to the Customer. Signater claims no ownership over it, is not a party to the Documents and does not review their content in advance.
7.2 The Customer grants Signater a limited, non-exclusive, worldwide, royalty-free license to host, store, reproduce, process, transmit and display Customer Content, solely to the extent necessary to operate the Platform, provide the contracted services and comply with legal obligations.
7.3 With respect to the personal data contained in Customer Content — in particular Signer data — the Customer acts as controller and Signater as processor, under the Brazilian General Data Protection Law (LGPD, Law No. 13,709/2018), the GDPR where applicable, and the Data Processing Agreement (DPA), which forms part of these Terms.
7.4 The Customer represents and warrants that it has a valid legal basis to process the personal data it submits to the Platform and to invite the Signers of its Envelopes, and that Customer Content does not violate any law or third-party rights.
7.5 When the Customer configures identity-verification requirements for Signers — including selfie capture, liveness detection, identity-document photos and facial comparison, which involve biometric data — it is solely the Customer's responsibility to ensure that the requirement is appropriate and proportionate to the purpose of the Document and that there is a valid legal basis for processing that data. The Customer is answerable to Signers and to the authorities for that choice.
8.1 When using the Platform, the Customer and its Users must not:
8.2 Signater may remove Customer Content, suspend accounts or restrict features — immediately and without prior notice in cases of serious violation, risk to the security of the Platform or of third parties, or legal requirement — without prejudice to any other available remedies.
9.1 Electronic signatures executed through the Platform are recognized as a valid expression of the signing parties' intent under Brazilian law (Provisional Measure No. 2,200-2/2001 and Law No. 14,063/2020) and under the electronic-signature laws of other jurisdictions where such laws apply, including the U.S. ESIGN Act and UETA.
9.2 The Platform records evidence of signature transactions — including IP address, device and browser data, date and time, geolocation when available, verification codes used and images collected during required verifications — which make up the Envelope's audit trail and certificate. Signed Documents carry cryptographic integrity protections and timestamping.
9.3 It is the Customer's responsibility to choose, among the authentication methods available on the Platform, those suited to the nature, value and legal requirements of each Document. Certain legal acts may require a specific form by law or by the recipient's own rules — including qualified digital certificates or notarial formalities — and the Customer must verify those requirements in advance.
9.4 Signater does not guarantee that government bodies, registries, financial institutions or any other third parties will accept electronically signed documents in any specific situation, and is not responsible for rejections based on those third parties' own requirements.
10.1 The Platform offers artificial-intelligence features, governed by the AI Terms, which form part of these Terms.
10.2 AI features run at the Customer's option or according to the settings the Customer defines for each Envelope. The Customer is responsible for deciding to enable them, for reviewing the output they produce and for the use it makes of that output. AI output is probabilistic in nature and does not constitute legal, tax or other professional advice.
11.1 API tokens are Customer credentials. The Customer is responsible for safeguarding them, for the security of the systems that use them and for every operation performed with them, and must revoke them immediately if it suspects they have been compromised.
11.2 Signater may apply reasonable technical and volume limits to API usage — such as request-rate limits — to protect the stability and security of the Platform.
11.3 Webhooks deliver Platform events to endpoints designated by the Customer. The Customer is responsible for the availability and security of those endpoints and for the handling of the data received through them.
11.4 Sandbox mode is intended exclusively for testing and integration. Envelopes and Documents created in sandbox mode have no legal validity and must not be used for real transactions.
12.1 Depending on the subscribed Plan, the Customer may use White Label features — customizing the Platform with its own brand, colors, domain and visual identity — and reselling features, through managed accounts created for its own customers. The conditions that apply to reselling are set out in the Reseller Program Terms.
12.2 These features constitute a limited customization and commercialization license, valid only while the Plan that includes them is active. They do not transfer to the Customer any rights in Signater's brand, software or any other intellectual-property asset.
12.3 A reselling Customer is solely responsible to its end customers for its offering, support, billing and commercial conditions, and for the legal compliance of its own operation and that of its end customers, including data-protection and consumer-protection obligations. Signater has no contractual relationship with the reseller's end customers.
12.4 When using its own domain, its own e-mail (SMTP) server or its own digital certificate within White Label features, the Customer represents that it owns or is authorized to use those assets and is responsible for their configuration and security.
13.1 The Platform, its software, code, design, trademarks, logos, databases and other elements are the exclusive property of Signater or its licensors. These Terms transfer no intellectual-property rights to the Customer; they grant only a limited, revocable, non-exclusive and non-transferable license to use the Platform for the duration of the contractual relationship.
13.2 Suggestions, ideas and comments the Customer submits about the Platform ("feedback") may be used freely by Signater to improve its products, with no obligation of payment or attribution. Submitting suggestions, feature requests or customization requests places Signater under no obligation to build them and creates no expectation as to timing: the Platform is a standardized service, and its features and priorities are defined by Signater alone, except where Signater expressly commits otherwise in a specific written proposal or agreement with the Customer.
14.1 Each party undertakes to keep confidential the other party's confidential information to which it gains access under these Terms, to use it only to perform its obligations under them, and to protect it with the same care it applies to its own confidential information — and never less than a reasonable standard of care.
14.2 Information is not confidential if it is or becomes public without breach of these Terms, was already lawfully known to the receiving party, is independently developed, or must be disclosed by law or by order of a competent authority — in which case the receiving party will, where legally permitted, notify the other party.
15.1 Signater's processing of personal data is described in the Privacy Policy and, for data processed on the Customer's behalf, in the Data Processing Agreement (DPA). Storage periods and criteria are set out in the Data Retention Policy, and the vendors that process data on Signater's behalf are listed on the Subprocessors page.
15.2 Signater does not sell personal data and does not use Signers' data for advertising.
16.1 The Platform is provided "as is" and "as available". To the maximum extent permitted by law, Signater makes no express or implied warranties, including warranties of fitness for a particular purpose, uninterrupted operation or freedom from errors.
16.2 Signater uses commercially reasonable efforts to keep the Platform available, but does not guarantee uninterrupted availability. The Platform may become unavailable, in whole or in part, due to scheduled or emergency maintenance, updates, vendor failures, or events of force majeure. The Platform's status and operational incidents can be monitored in real time on the public status page at status.signater.com.
16.3 Support is provided according to the subscribed Plan. Service-level commitments (SLAs) exist only where expressly defined in a specific proposal or agreement executed with the Customer, on the service conditions established there.
17.1 To the maximum extent permitted by law, Signater is not liable for indirect, incidental or consequential damages, loss of profits, revenue, business, reputation or data, even if advised of the possibility of such damages.
17.2 To the maximum extent permitted by law, Signater's total aggregate liability arising out of these Terms or the use of the Platform, on any legal theory, is limited to the total amount actually paid by the Customer to Signater in the 12 (twelve) months preceding the event giving rise to the liability.
17.3 Nothing in these Terms excludes or limits any liability that cannot be excluded or limited under applicable law, including mandatory consumer-protection and data-protection rights in the Customer's jurisdiction, which remain unaffected.
18.1 The Customer will indemnify and hold Signater harmless from losses, damages and reasonable expenses and costs, including attorneys' fees, arising from third-party claims — including claims by Signers and authorities — related to: (a) breach of these Terms or of the acceptable-use rules by the Customer or its Users; (b) Customer Content; (c) identity-verification requirements configured by the Customer, including those involving biometric data, without a valid legal basis; or (d) use of the Platform in violation of the law.
19.1 These Terms remain in force for as long as the Customer holds an account on the Platform.
19.2 Signater may suspend the Customer's or a User's access, in whole or in part, in cases of breach of these Terms, non-payment, risk to the security of the Platform or of third parties, or legal or regulatory requirement, notifying the Customer where possible.
19.3 When a paid Plan ends — through cancellation, non-payment or non-renewal — the account is moved to the Free Plan and features exclusive to paid Plans cease to be available. In that case, Signater may, among other measures needed to bring the account within the Free Plan's limits: deactivate additional Users while keeping the account owner; revoke API tokens; deactivate White Label configurations; and place published Envelopes on hold. Any remaining One-time Envelopes remain available.
19.4 Signater may close the Customer's account in cases of serious or repeated breach of these Terms, fraudulent or unlawful use of the Platform, or legal requirement. The Customer may request the closure of its account through the channels listed in Section 23; the handling of data after closure follows the Data Retention Policy.
19.5 The provisions that by their nature should survive termination of these Terms will survive, including those on intellectual property, confidentiality, limitation of liability, indemnification, governing law and forum.
20.1 Signater may update these Terms at any time. Material changes will be announced with reasonable prior notice, by e-mail or through a notice on the Platform. Continued use of the Platform after the changes take effect constitutes acceptance of the new Terms. The current version is always available at signater.com/terms-of-service.
21.1 The Customer may not assign or transfer these Terms, in whole or in part, without Signater's prior written consent. Signater may assign these Terms to companies in its group or in the context of corporate transactions, with notice to the Customer.
21.2 These Terms create no partnership, employment, agency or representation relationship between the parties.
21.3 A party's tolerance of any breach of these Terms does not waive its right to enforce the breached provision.
21.4 If any provision of these Terms is held invalid or unenforceable, the remaining provisions remain in full force, and the affected provision will be construed so as to preserve the parties' original intent to the greatest extent possible.
21.5 Communications between the parties may be made by e-mail — to Signater at the addresses listed in Section 23, and to the Customer at the e-mail address registered on the account — and are valid for all purposes.
21.6 These Terms, together with the documents incorporated into them, constitute the entire agreement between the parties regarding the use of the Platform and supersede prior understandings on the same subject, except for specific written agreements executed between the Customer and Signater, which prevail to the extent they provide otherwise.
22.1 Where your contracting entity is Signater LLC, these Terms are governed by the laws of the State of Florida, United States, and the parties elect the state and federal courts located in Miami-Dade County, Florida, for any dispute arising out of them.
22.2 Where your contracting entity is Signater Tecnologia Ltda, these Terms are governed by the laws of the Federative Republic of Brazil, and the parties elect the courts of the judicial district of Barueri, State of São Paulo, Brazil, waiving any other venue, however privileged, subject to the venue rules of mandatory consumer-protection law where applicable.
22.3 In any case, if you are a consumer or a data subject in a jurisdiction whose mandatory consumer-protection or data-protection laws grant you rights that cannot be waived by contract, nothing in these Terms deprives you of those rights or of any venue protections those laws provide.
23.1 Questions about these Terms, legal requests and personal-data requests may be sent to [email protected]. For general support, use [email protected].
23.2 Signater LLC — 2125 Biscayne Blvd, Ste 204 #27075, Miami, Florida 33137, United States. Signater Tecnologia Ltda — CNPJ 50.348.626/0001-61 — Alameda Rio Negro, 503, Suite 2020, Alphaville, Barueri/SP, 06454-000, Brazil.
Signers: the conditions that apply to people who sign, approve or fill in Documents through the Platform are in the Terms for Signers.
Affiliate Program: the conditions of Signater's Affiliate Program are in the Affiliate Program Terms.
Reseller Program: the conditions of Signater's white-label reseller program are in the Reseller Program Terms.