e-Signing & Document Management
Sign smarter.
Close faster.
Legally binding e-signatures, real-time document tracking, and a direct line to Invoice Ninja — so you sign a contract and invoice your client in one click.
Free plan includes 1 document/month · Pro from $12/month · No per-document fees
$0
Free plan — always$12/mo
Pro — unlimited docs100MB
Max file size supported5
File formats accepted2014
Invoice Ninja foundedMore than e-signing.
A full document workflow.
DocuNinja handles your entire document lifecycle — from uploading a contract to getting it signed, filed, and invoiced. It's the only e-signing tool that connects directly to your invoicing software, so closing a deal automatically creates an invoice.
- ✓ Upload PDF, DOCX, XLSX, JPEG, or PNG — up to 100MB
- ✓ Drag-and-drop signature, date, and custom fields
- ✓ Send via email — recipients sign with no account needed
- ✓ Real-time audit trail — see every view and signature
- ✓ Connect to Invoice Ninja — sign then invoice in one click
✓
All signed
📄 Service_Agreement.pdf
✓ Signed
Signature
J. Robertson
Date
Apr 12, 2026
JR
Jamie Robertson
Client · Signer
✓ Signed
YO
You (Owner)
Sender · Approver
✓ Signed
SL
Sarah Liu
CC · Viewer
👁 Viewed
🧾
Signed — Invoice created in Invoice Ninja
Just now · 1-click conversion
DocuSign charges per envelope after 100/year. Adobe Sign limits by seat. DocuNinja Pro is $12/month — unlimited documents, no counting, no surprises. And it’s the only e-signing tool that also invoices your clients.
Everything you need to sign, send & get paid
Legally Binding e-Signatures
ESIGN Act, UETA, eIDAS, and GDPR compliant. Every signature is timestamped, encrypted, and court-admissible worldwide.
Document Audit Trail
Full visibility into every view, open, and signature event. Real-time tracking so you always know where your document stands.
Multi-Party Signing
Assign Signer, Approver, or Viewer roles to any number of participants. Route through any approval chain.
Custom Fields
Add signature fields, checkboxes, calendar dates, and custom text fields anywhere in your document — no PDF editor needed.
Custom Branding
Upload your logo and company details for a consistent, professional look on all signing requests and documents.
Custom Email Templates
Personalize the text for signature request emails, completion notifications, and reminders to match your brand voice.
Invoice Ninja Integration
The only e-signing platform that connects to invoicing. Sign a contract, then create the invoice — all in one workflow.
Enterprise-Grade Security
SOC 2, HIPAA, GDPR, eIDAS, UETA, ESIGN Act, and 21 CFR Part 11 compliant. Encrypted in transit and at rest.
Sign on Any Device
Recipients sign from desktop, tablet, or mobile. No account or app install required. Draw, type, or upload a signature.
From document to signed deal in minutes
Upload your document
Upload any PDF, DOCX, XLSX, JPEG, or PNG file — up to 100MB each. Or start from a saved template.
Add fields & recipients
Drag-and-drop signature, date, and custom fields. Add signers and assign roles in seconds.
Send & track
Recipients get an email link — no account needed. Watch the full audit trail update in real time.
Signed → Invoiced → Paid
Enterprise users on Invoice Ninja can convert signed docs to invoices in one click.
Loved by freelancers & small businesses
"Finally an e-signing tool that doesn't charge me per document. DocuNinja Pro at $12/month and I send as many contracts as I want. Game changer."
Alex M. · Freelance Developer"The Invoice Ninja integration is brilliant. I send a proposal, client signs it, and the invoice is right there waiting. My whole billing flow is seamless now."
Sarah K. · Marketing Consultant"Switched from DocuSign and haven't looked back. Same compliance, way simpler interface, and my clients find it much easier to sign on mobile."
Tom R. · General ContractorInvoice Ninja
Stripe
PayPal
Zapier
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Simple pricing. No per-document fees. Ever.
Flat monthly rate. Unlimited documents on paid plans. Cancel any time.
Free
- ✓ 1 document per month
- ✓ Legally binding e-signatures
- ✓ Document audit trail
- ✓ Custom fields
Pro
- ✓ Unlimited documents
- ✓ Unlimited signatories
- ✓ Custom branding & email templates
- ✓ Full audit trail & tracking
- ✓ SOC 2, HIPAA, GDPR, eIDAS
Enterprise
- ✓ All DocuNinja Pro features
- ✓ Sign → Invoice → Pay in one flow
- ✓ Lock delivery until payment
- ✓ Full Invoice Ninja Enterprise
- ✓ Requires Invoice Ninja Enterprise
Common questions
Is DocuNinja really free?
Yes — the Free plan includes 1 document per month with legally binding e-signatures, audit trail, and custom fields. No credit card needed. Upgrade to Pro for $12/month for unlimited documents.
What file formats are supported?
PDF, DOCX, XLSX, JPEG, and PNG — up to 100MB per file. Documents are processed securely and never stored longer than needed.
Are DocuNinja signatures legally binding?
Yes. DocuNinja aligns with ESIGN Act and UETA (US), eIDAS (EU), GDPR, HIPAA, SOC 2, and 21 CFR Part 11. Signed documents include a full encrypted audit trail.
Do recipients need a DocuNinja account to sign?
No. Recipients receive an email link and sign directly in their browser — no account, no app, no friction. Works on desktop, tablet, and mobile.
How does the Invoice Ninja integration work?
On the Invoice Ninja Enterprise plan, you can send a document for signing and then convert the signed agreement directly to an invoice — or lock document delivery until the client pays. The entire flow happens in one platform.
Is there a limit on the number of signers?
Free plan: basic signing. Pro plan: unlimited co-signers and multiple signatories per document. Assign Signer, Approver, or Viewer roles to each participant.
Sign smarter.
Start with DocuNinja today.
Free plan available. Pro from $12/month. No per-document fees, ever.
No credit card · Cancel any time · SOC 2 & HIPAA compliant