Closed beta · invite only
Seal it. Send it. Prove it.
Send a file that only opens after the other party signs. Or seal your own work to prove you had it, untouched, on this date. Either way you keep a timestamped record anyone can verify — without trusting us.
StatusClosed beta
AccessInvite-only
ReviewWeekly waves
§ 01 / How it works
Two modes. One engine.
One evidence engine, two ways to use it. Send a file with a signed agreement, or seal your own work on its own — both produce a verifiable, timestamped record.
MODE · SEND
Send — prove the exchange.
Upload, the recipient countersigns to open (add an NDA if you need confidentiality), both keep the record.
MODE · SEAL
Seal — prove you had it first.
Upload, sign authorship, get a timestamped seal. No recipient needed. Proof you had it, intact, on this date.
Both seal with SHA-256 and an independent RFC 3161 timestamp. Verifiable by anyone at pxnda.com/verify.
§ 03 / Why PxNDA
Built for moments that need a record.
Whether you send to someone or seal on your own, PxNDA turns it into one verifiable record — proof that rests on math and an independent time authority, not on trusting us.
01 · Jurisdiction-aware
NDA tailored to both parties.
Every transfer references the ESIGN Act (US), with cross-border equivalence for EU and LATAM common-law jurisdictions. PxNDA auto-selects the applicable template based on both parties' residence. Always review with qualified counsel before binding use.
02 · Timestamped & hashed
Cryptographic receipt, every time.
A SHA-256 fingerprint is locked in with an independent RFC 3161 timestamp — on every seal and every signature. The record stays archived for compliance.
03 · Zero account friction
Your recipient doesn't sign up.
They click, read, sign, download. We never ask them to register. Lower friction means higher signing rates — your file actually moves.
04 · Encrypted & archived
Files protected, records preserved.
Files are encrypted in transit (TLS 1.3) and at rest. After the signing window closes, the file is removed. The signed agreement and metadata stay archived for 7 years on Pro.
05 · Verifiable
Independent of us.
PxNDA doesn't ask you to trust it. The proof rests on math (SHA-256) and an independent time authority (FreeTSA). Anyone can verify, with no account.
§ 04 / FAQ
Common questions.
Why is access invite-only?
The product is fully functional, but legal review in some jurisdictions is still in progress. Until we complete that review, we limit weekly onboarding so every transfer issued is properly documented. The waitlist gives us a controlled rollout.
How does the waitlist work?
We review submissions in waves and prioritize use cases close to our legal-cleared coverage (DR, US, EU). Onboarding cadence varies — we send invites as our coverage expands.
Is the NDA legally binding?
The NDAs PxNDA generates are based on industry-standard mutual NDA templates and reference the ESIGN Act (United States), with cross-border equivalence for EU and LATAM common-law jurisdictions. PxNDA is a tool, not a law firm — review with qualified counsel before binding use.
Does the recipient need an account?
No. They get a single-use link, review the NDA in their browser, sign, and download. We never ask them to register.
What happens to my files?
Files are encrypted in transit (TLS 1.3) and at rest, and held only for the signing window. After the recipient downloads (or the window expires), the file is removed. The signed agreement and metadata stay archived for compliance — never the file itself.
How do I get my invite faster?
If your use case is time-sensitive (M&A, urgent client work), mention it when you sign up. Existing users can also share their personal invite codes with collaborators.
When do I Seal vs Send?
Seal when you just need to prove a work is yours, intact, on a date — no recipient involved (pitches, drafts, designs, scripts). Send when you're handing a file to someone and want a signed agreement (and optional NDA) before they open it. Same engine, same verifiable record — one is solo, one is an exchange.
How is PxNDA different from using DocuSign + Dropbox?
Those are three separate tools for three separate steps — sign here, store there, send somewhere else. PxNDA collapses the whole exchange into one signed act: the agreement and the file are sealed together, and both parties keep one cryptographic, timestamped record. One step, one proof — not three accounts.
Prove you had it first.
Seal your work to prove you had it on this date, untouched. No recipient needed.
Select your file
Hashed on your device — never uploaded.
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This is proof of existence and integrity at a point in time — not a copyright registration. Keep your original file.
Files and agreements protected by NDA · Both parties receive a signed PDF
Review & sign
Sign before sending to recipient
Your signature
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Sign with finger, stylus or mouse
Tap to upload your signature image
By signing you confirm you have authority to bind the party you represent.
✓
Sent to recipient
Awaiting signature
The recipient will receive an email with a secure link to review and sign the agreement before accessing your files.
From
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Your signature
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Sign with finger, stylus or mouse
Tap to upload your signature image
By signing you agree to the confidentiality terms. You'll receive the signed PDF and access to all attached files.
Executed · binding
Agreement executed.
Both parties have signed. The transfer is now legally binding under the ESIGN Act / UETA. Cryptographic record sealed by FreeTSA.
TSA-sealed
§ 01Parties & signaturesboth signed
§ 02Audit timeline
§ 03Cryptographic integritySHA-256 · FreeTSA · RFC 3161
§ 04Downloadspermanent record
This record is anchored. Any tampering would change the SHA-256 hash and break the FreeTSA seal. Anyone with the reference can verify it at pxnda.com/verify.
Honest pricing. Cancel anytime.
Free proves it. Pro keeps it — your file held encrypted in custody while you're a member, every action logged. Cancel anytime; your proof stays verifiable forever.
Free
$0 /moSend your first protected files. Everything you need to test the flow.
- 50 seals / month · 3 transfers / month
- Hash-only — your file never leaves your device
- Your proof is permanent, always — verifiable by anyone
Pro Most popular
$89 /yr$7.42/mo billed annually · save 26%
Evidence, kept.
- Unlimited seals & transfers
- Custodied file — your original stored encrypted (AES-256); proof and file never separated
- Kept while you're Pro — in custody as long as you're a member (15 GB)
- Chain of custody — every action timestamped, exportable as an audit log
- AI-drafted custom NDA clauses · all 8 templates · priority support
- Built to stand up to scrutiny — exportable evidence pack for disputes.
Included in every plan
AES-256 encryption · RFC 3161 / FreeTSA timestamp · SHA-256 receipts · Standard NDA templates · Draw / Upload / Type signatures · Recipient signs without an account · Evidence certificate PDF · 2FA available
What you unlock with Pro
FeatureFreePro
Seals / month50Unlimited
Transfers / month3Unlimited
Proof (hash + timestamp)PermanentPermanent
Custodied original file—Encrypted · while member
Custody storageHash-only15 GB
AI-drafted custom clauses—
Industry templates2 of 8All 8
Branded verification—
Audit log export—
Support response48 hPriority < 8 h
Custom legal review available as a paid add-on on Pro.
Not a guarantee of any outcome — that's for a court to decide, not us.
Retention
Your proof is permanent — always, on every plan. With Pro, we also hold your file in custody, encrypted, for as long as you're a member. Cancel anytime: your file is yours to download, and the proof stays verifiable forever.
Two levels of privacy — you choose
In Free, we only ever hold the hash of your file, never the content. In Pro, when you store the file, we keep it encrypted and access-restricted to you — in our custody, not the hash-only mode where it never touches our servers. Control, or convenience. Your call.
An evidence layer for sharing.
Share a file and you're trusting the other side to remember who had it first — and to keep it intact. PxNDA replaces that trust with proof: a cryptographic record that this exact file existed, untouched, at a point in time — verifiable by anyone, independent of us. Proof of existence, integrity, and priority in time. Not a copyright registration, and not legal advice. PxNDA is not a law firm.
MODE · SEND
Send it with a signed agreement
The file only opens after the other party countersigns — add an NDA if you need confidentiality. Single-use link, no account required. Both sides keep one cryptographic, timestamped record of the exchange.
MODE · SEAL
Seal your work on its own
Upload, sign authorship, get a timestamped seal — no recipient needed. Proof of priority and integrity: you had it, intact, on this date. Only its fingerprint is sealed — the file itself never has to leave your device.
When to use which — Seal a pitch, a draft, a portfolio, or a script to prove you had it, intact, on a date. Send when you're handing a file to someone and want it under a signed agreement before they open it.
Built on cryptographic primitives.
PxNDA doesn't trust itself — it produces evidence anyone can verify. Independent of us.
SHA-256 — file fingerprint, locked in at signing time
RFC 3161 timestamp — independent TSA seal from FreeTSA
AES-256 — encryption in transit and at rest
Binding under ESIGN Act · UETA
Frequently asked.
The questions we get most, in plain language.
What is PxNDA?
PxNDA is an evidence layer for sharing. Two modes over one engine: seal your own work on its own to prove you had it — intact, on a date, no recipient needed — or send a file with a signed agreement (and an optional NDA) so it only opens after the other party countersigns. Either way, the act and the file's SHA-256 fingerprint are sealed with an independent RFC 3161 timestamp, and anyone can verify the record — independent of us.
Why seal my work?
Because "I had this first" is hard to prove after the fact. Sealing creates a timestamped, tamper-evident record that this exact file existed, intact, on this date — verifiable by anyone, independent of us. Useful before you pitch an idea, share a draft, send a portfolio, or publish: if a dispute ever comes up, you hold evidence of priority and integrity. It doesn't grant ownership or copyright — those come from law and authorship — it proves the timeline.
Is the NDA legally binding?
A non-disclosure agreement (NDA) is a contract in which the parties agree to keep shared information confidential. On PxNDA the recipient signs it electronically before accessing your file, and both sides receive a countersigned PDF as evidence of execution. Electronic signatures are recognized under the ESIGN Act and UETA (United States), among other jurisdictions. PxNDA is not a law firm — review with qualified counsel before binding use.
What's SHA-256, RFC 3161 timestamp, AES-256, ESIGN Act · UETA?
These are the building blocks behind every PxNDA record:
SHA-256 — a cryptographic fingerprint of your file. Changing even a single byte produces a completely different hash, so any tampering is detectable.
RFC 3161 timestamp — an independent, trusted time seal (from FreeTSA) proving the document existed at a specific moment, sealed by a third party rather than by us.
AES-256 — bank-grade encryption protecting your files in transit and at rest.
ESIGN Act · UETA — the US federal and state laws that give electronic signatures the same legal standing as ink-on-paper.
SHA-256 — a cryptographic fingerprint of your file. Changing even a single byte produces a completely different hash, so any tampering is detectable.
RFC 3161 timestamp — an independent, trusted time seal (from FreeTSA) proving the document existed at a specific moment, sealed by a third party rather than by us.
AES-256 — bank-grade encryption protecting your files in transit and at rest.
ESIGN Act · UETA — the US federal and state laws that give electronic signatures the same legal standing as ink-on-paper.
Can the recipient see my files before signing?
No. The files stay locked until the recipient signs the NDA — no preview, no thumbnail, no metadata leakage. Agreement and access happen at the same moment.
Does the recipient need an account?
No. Recipients open the link, review the NDA, sign, and download — no account required. Only the sender needs an account.
Built by people who got tired of emailing files without paperwork.
PxNDA was born inside a Caribbean media lab to fix one specific frustration: every time we shared a script, term sheet, or unreleased master, the receiving party promised confidentiality in chat — and that was it.
Our story
From in-house tool to public infrastructure.
We sent the first protected file to a session musician in 2024. The flow worked: sign the NDA, then the file unlocks. We kept building. Today, PxNDA is used by independent labels, investors, agencies, and legal teams across the Dominican Republic, the US, and Spain.
We're not a law firm. We're not pretending to replace one. We're an infrastructure layer — file transfer with a signed receipt — that gives small teams the same legal posture big companies get from an enterprise contract-and-storage stack. Cheaper, faster, no integrations.
We're still in closed beta while our counsel completes cross-jurisdiction review. The waitlist is real — every team that joins gets a real review.
Built by
Algo Mejor Media Labs
An independent media R&D studio based in Santo Domingo, Dominican Republic. Founded to ship small, useful tools.
Founded2024 · Santo Domingo, DR
TeamSmall & bootstrapped
Contact
Get in touch.
Press, partnerships, legal review questions, or just to say hi.
Contactpxnda@algomejor.do
Want an invite?
We send about 30 invites a week, prioritizing teams in our cleared jurisdictions (DR, US, EU).
Account
Personal info is used to pre-fill every NDA you send. Never shared.
REF · —
Personal infoused in NDAs
Address
Digital signaturePNG · JPG · SVG · 512 KB
Click to upload or drag & drop
Ready
Plan & usage
You're on PxNDA Free. Resets on the 1st of each month.
REF · — · cycle —
PxNDA Free
$0 /mo- 2 GB storage
- 3 transfers / month
- Standard NDAs
- 5-day retention
Usage this cycleresets · —
Transfers
/ —
Storage
/ —
Retention window
5 days
Upgrade to PxNDA Pro
Unlimited seals & transfers · 15 GB custody · custom NDAs · permanent proof
$9.99 /mo
→
Danger zone
Deleting your account permanently removes all agreements, files and personal data. Signed records remain archived in compliance with binding obligations.
Security
Change your password. We recommend strong, unique passwords.
REF · —
Change passwordmin 8 characters
Passwords must match and be at least 8 characters.
Tip: Use a password manager. After changing, you'll stay signed in on this device but other sessions may require re-authentication.
Ready
Sign-in activity
Recent sessions on your account. Don't recognize one? Revoke it and change your password.
REF · —
Loading sessions…
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Help & support
Common questions, or write to us directly.
Frequently asked
What happens when my files expire?
Free transfers expire after 5 days. The files are permanently deleted from our servers, but the signed agreement PDF remains archived for compliance. Pro users have unlimited retention.
Is the NDA legally binding?
Yes. Signed agreements are governed by the ESIGN Act (United States), among other jurisdictions. Both parties receive a countersigned PDF as evidence of execution. PxNDA is not a law firm — review with qualified counsel before binding use.
Can the recipient see my files before signing?
No. The files remain locked until the recipient signs the NDA. No preview, no thumbnail, no metadata leakage. Agreement and access happen at the same moment.
How is my data protected?
Files are encrypted in transit (TLS 1.3) and at rest. We use Supabase storage with row-level security. Personal info is never sold or shared with third parties. See Privacy Policy.
Can I cancel my Pro subscription?
Yes, anytime from your Plan & usage modal. You'll keep Pro features until the end of your billing cycle, then revert to Free. No refunds for partial periods.
Vault
2 agreements · 1 awaiting
2
Total
1
Awaiting
1
Signed
Awaiting · 1
oldest first
Signed · 1
newest first
No agreements yet.
Send a protected file in under 30 seconds. The recipient signs to open and you both keep the record.
Back to Vault
JG
Pending
PXNDA-8440686 · 3 days left
Javier Galán
Recipient
galanjavier1@gmail.com
Purpose
Service Agreement Review
File
service-agreement.pdf · 1.2 MB
Expires
May 20 · 22:00 UTC
Activity
May 17 · 09:22
May 17 · 14:08
Now
You sent the agreement
Mutual NDA · DR-104 · 1.2 MB sealed
Recipient opened the link
Chrome · macOS · Madrid, ES
Awaiting countersignature
No action since opening
● Welcome back
Sign in to PxNDA.
Pick up where you left off. Your agreements, signatures, and audit trails are waiting.
● Reset password
Forgot your password?
Enter your account email. We'll send you a link to reset your password. The link expires in 15 minutes.
We'll send a one-time reset link to this address.
● Token verified
Choose a new password.
Resetting the password for your account. After saving, all other sessions will be signed out.
Expires in 15:00
—
12+ characters
Mixed case
Number
Symbol
All other active sessions will be signed out for security.
PxNDA
Signature verification
Transaction
—
404 · Empty
—
PxNDA
Agreement not found.
This link doesn't match any record in the vault. It may have been revoked by the sender, or the reference is from an older release.
tried — · at —Need help? Contact support →
410 · Gone
—
PxNDA
This link has expired.
The signing window closed before a countersignature was recorded. The file and the agreement are both void.
expired — · window 7 daysNothing was accessed. Read what that means →
● Decline agreement
Decline this agreement?
The sender will be notified that you didn't sign. The file will not be released and no NDA will be recorded.
Helps the sender understand and improve. Your name will be shared with the reason; the message stays private.
The sender can re-issue this NDA to another recipient or to you with adjusted terms. No file has been accessed.
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Audit log
Forensic record of every action across your agreements · compliance-grade evidence
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Events · 30 d
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Agreements signed
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Pending action
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TSA seal · success
Showing 0 of 0 events · cycle —
proof · permanent · plan Free
Notifications
Choose what arrives in your inbox. Critical events are always delivered.
Agreement events
notify me when…
Email
SMS
In-app
Recipient opens the link
First time the signing page is loaded by the recipient.
Recipient signs Always
The agreement becomes binding. Cannot be disabled.
Recipient declines the agreement
Includes their stated reason and any message.
Link expires without signature
3-day countdown reminder, then expiry notice.
Account & security
always-on for new locationsSign-in from a new device or location
Sent within 60 seconds of unrecognized login.
Password changed
Triggers when you (or someone) updates your password.
Billing changes
Subscription, plan changes, failed payments.
Digest & summaries
batched updatesWeekly digest
Summary of agreements, signatures, pending actions.
Marketing & product updates
New features, beta invites, occasional case studies. ~1× /month.
Pause all non-critical notifications
Mutes everything except signing events and security alerts. Useful while traveling or on leave.
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