Digital Signature Open Source Software for SignNow

Award-winning eSignature solution

What digital signature open source software does

Digital signature open source software is software that lets people sign documents electronically while keeping a verifiable record of who signed, when they signed, and whether the file changed afterward. It works by creating a cryptographic hash of the document, linking that hash to the signer’s identity, and storing an audit trail that supports later verification. In U.S. transactions, this helps organizations replace paper workflows with faster, traceable signing while preserving evidence of intent, integrity, and attribution.

Why it matters under U.S. law

It reduces paper handling, speeds approvals, and supports enforceability when the process meets ESIGN and UETA requirements. The business value comes from faster turnaround and clearer evidence, while the legal outcome depends on consent, attribution, and reliable records.

Why teams look for DocuSign alternatives

Frequent implementation pain points

Identity proofing can be too weak for higher-risk transactions, which makes later attribution harder to defend.
Open-source deployments often need extra configuration for audit trails, retention, and access controls.
Signature validity can be questioned if document hashing, timestamps, or tamper evidence are incomplete.
Teams may overlook consent, record retention, or BAA requirements in regulated U.S. workflows.

Healthcare

Healthcare teams collect patient forms, authorizations, and intake documents with HIPAA-aware controls.

Real estate

Real estate teams send leases, disclosures, and rental applications for remote signing.

Real users and the roles they fill

A director of NetSuite operations at Xerox uses signNow to route the right signatures to the right documents in the right formats. That matters when approvals depend on ERP data, role-based routing, and consistent document handling across departments and business units.
A founder at a healthcare practice such as Fertility Centers of Illinois uses signNow to collect patient signatures and keep forms moving on desktop or mobile. The value is practical: faster intake, clearer records, and workflows that fit regulated healthcare operations.

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Identity binding

Creates a signed record that links the signer, the document, and the signing event for later verification.

Audit trail

Captures timestamps, IP data, and event history so the signing process is easier to review.

Tamper evidence

Uses cryptographic hashing to show whether the document changed after signing.

Mobile access

Supports mobile signing so people can review and sign on phones, tablets, or desktops.

Workflow control

Helps teams standardize approvals with templates, reusable fields, and repeatable workflows.

Compliance support

Fits regulated use cases by supporting retention, access controls, and compliance-oriented recordkeeping.

Connections that fit existing systems

Connected systems move signed documents into the tools teams already use, which reduces manual re-entry and keeps records aligned across departments.

How the signing flow works

The signing process follows a clear sequence from document delivery to sealed record storage.

Open document: The signer opens the document and reviews the request.
Verify signer: The system verifies identity with the chosen authentication method.
Sign document: The signer applies the signature and submits the record.
Seal record: The platform seals the file and stores the audit trail.

Quick setup steps

A short setup sequence helps teams launch signing workflows without overcomplicating the process.

Prepare file:
Choose the document and add required fields.
Configure routing:
Set signer order and authentication rules.
Send request:
Send the request to each signer.
Archive record:
Track completion and store the final copy.

Setting	Recommendation
Authentication method	SMS OTP with ID verification
Signature type	SES for routine contracts
Audit trail	Enabled for every envelope
Document retention	6 years for HIPAA records
Encryption	TLS 1.2/1.3 and AES-256

Platform and device requirements

Digital signature open source software usually runs in modern browsers and on current desktop and mobile operating systems.

Desktop browsers Chrome, Firefox, Safari, and Edge
Operating systems Windows, macOS, iOS, and Android
Network security TLS 1.2 or TLS 1.3

For regulated deployments, managed devices, current browser versions, and secure network settings matter more than the device brand itself. Teams should also confirm SSO, API access, and retention controls before rollout, especially when HIPAA, FERPA, or other recordkeeping rules apply.

Security and compliance controls

Transport security:

Data protected in transit with TLS 1.2/1.3

Storage encryption:

Data protected at rest with AES-256

SOC 2 Type II:

SOC 2 Type II report available on request

ISO 27001:

ISO 27001 certified

HIPAA:

HIPAA support with BAA required

EU compliance:

GDPR and eIDAS aligned controls

Enterprise operations

A Xerox operations leader needed signatures routed in the right format across NetSuite-connected workflows.

Right signatures on the right documents.
NetSuite integration kept formats aligned.

The result was more consistent routing and less manual handling across internal document flows, which helped support faster processing and clearer control over approvals.

Healthcare intake

A healthcare founder needed online signing for patient forms without losing security or mobile access.

Patients signed on desktop or mobile.
Forms moved faster through intake.

The workflow supported faster patient document collection and easier record handling, while keeping the process aligned with healthcare security and retention expectations.

Best practices for reliable signing

A careful setup reduces disputes, supports compliance, and keeps signing workflows easier to manage over time.

Match authentication to risk

Use stronger authentication for contracts, healthcare records, and financial approvals. Match the method to the risk level, and keep the signer identity evidence with the signed file so the record can support later review or dispute resolution.

Preserve the audit trail

Keep the audit trail attached to the final document and preserve timestamps, IP data, and event history. That makes it easier to show who signed, when they signed, and what changed during the signing process.

Define retention before launch

Set retention rules before rollout, especially for HIPAA, FERPA, and finance records. If a regulation requires a specific retention period, document it in policy and make sure exports remain readable after the original workflow ends.

Restrict access by role

Limit access with role-based permissions and SSO where available. Provision only the users who need signing or admin access, and review permissions regularly so inactive accounts do not keep unnecessary access to sensitive documents.

FAQ and troubleshooting

These answers focus on plan limits, compliance requirements, and recordkeeping issues that affect signing workflows in the U.S. and abroad.

signNow supports legally binding eSignatures under ESIGN and UETA. If a document is disputed, check whether the signer consented to electronic records, whether the audit trail is complete, and whether the final file was preserved without changes.

For HIPAA workflows, signNow can be used with a BAA. The platform must protect PHI with access controls, audit controls, and encryption, and signed records should be retained for 6 years under 45 CFR 164.530(j)(2).

Business plans include unlimited users, but advanced needs such as SSO, full API access, and some regulated add-ons are tied to higher tiers or Site License. Review the plan details before assigning admin or integration work.

signNow includes audit trails that log signer activity, timestamps, and document history. If a recipient says the record is incomplete, verify that the envelope finished successfully and that the exported PDF includes the full signing history.

For FDA-regulated records, 21 CFR Part 11 requires validation, secure audit trails, and unique signer identification. signNow can support those controls, but the surrounding system design and validation documentation still need to match the predicate rule.

If a team needs EU-qualified signatures, check the plan and the transaction type. signNow supports SES on all plans, while QES and AES are tied to Site License options for EU use cases.

signNow	DocuSign	Adobe Sign	PandaDoc
ESIGN and UETA	Yes	Yes	Yes
Audit trail	Yes	Yes	Yes
Envelope cap	Unlimited	100/year	Varies by tier
HIPAA support	Yes	Yes	Yes

Day 1:

Set up the account, templates, and permissions.

Day 2:

Send the first document for internal approval.

Week 1:

Onboard the full team and confirm routing rules.

7-day trial:

signNow offers a 7-day free trial with no credit card.

HIPAA retention:

Keep signed PHI records for 6 years under 45 CFR 164.530(j)(2).

21 CFR Part 11:

Validate the system before use in FDA-regulated workflows.

ESIGN consent:

Capture electronic consent before first use in interstate commerce.

UETA adoption:

UETA is adopted in 49 states, plus D.C., Puerto Rico, and the U.S. Virgin Islands.

Risks of poor implementation

Weak attribution

The record may be harder to enforce.

Incomplete logs

The audit trail may be challenged.

Missing BAA

HIPAA penalties may apply.

Part 11 gaps

FDA records may be rejected.

Signer authentication:

Verifies the signer with the chosen method.

Timestamp capture:

Records the event time in UTC.

Document hashing:

Calculates a hash for the file.

Tamper-evident sealing:

Locks the record against later changes.

Audit log storage:

Stores the event history with the file.

Retrieval and export:

Exports the trail for review or evidence.

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
Starting price	$8/user/mo	$15/user/mo	$14/user/mo	$19/user/mo	$15/user/mo
Free trial	7-day trial	Not verified	Not verified	Not verified	Not verified
Bulk send	Business Premium	Not verified	Not verified	Not verified	Not verified
Audit trail	Included	Included	Included	Included	Included
Envelope cap	No cap	100/user/year	Not verified	Not verified	Not verified

28M+Documents signed

13+Years in business

4.6/5Average G2 rating