European e-signature · no sending limits, even on the free plan
Sign, send and prove any document.
Contracts, quotes, notices, diplomas. Send it as a link, by WhatsApp or email; they sign or accept it on their phone, with no account, and you keep sealed proof —which version, who and when— that anyone can check without relying on us.
This is a sealed document. Try changing it.
Quote
From your company, to your client
No. 2026-11812 September 2026
| Work agreed at the site visit on 3 September | €4,100.00 |
| Materials | €750.00 |
Lead time: three weeks from acceptance. Offer valid for 30 days.
Authentic. This is the document sent on 12 September 2026, down to the last comma.
Altered. This is no longer the document that was sent: its fingerprint doesn’t match.
- Fingerprint of the original
- …
- Fingerprint of this one
- …
The SHA-256 fingerprint is really computed, here, in your browser: that’s how CODEX checks a document, in 3 seconds.
Sound familiar?
“That’s not what I signed”
The contract or the quote changed version and nobody knows which one counted. Here every version is sealed with its date, and the signature or acceptance says which one it was.
“I never got it”
You send an important notice and later they say it never arrived. Here you see who opened it and who confirmed it, with their name and the time.
“This degree is fake”
With AI, forging a PDF takes minutes. A sealed document can’t be changed without it showing: if anyone touches a single letter, the check says so.
One account, eight tools
What you pay for separately today —signing, proposals, proof of receipt, diplomas, legal texts— with the same account and the same sealed proof:
Sign contracts
Engagements, NDAs, rentals: several people sign, in order, from their phone. And you can sign with your digital certificate when it is needed.
Quotes and proposals
Your client accepts or proposes changes; every new version is accepted in the same link.
Notices with proof of receipt
Circulars, notices, meeting calls: who opened it, who confirmed it and who did not, in a sealed dossier.
Diplomas and certificates
Anyone checks them in one click; issued in bulk and revocable if needed.
Review legal texts
Privacy, legal notice, cookies: what is missing and what is wrong, with the article that requires it.
Check any PDF
Drop it and know whether it is the original or has been altered. Also from your AI assistant: here is how.
Receive sealed documents
Your inbox: what people send you arrives with its fingerprint and a certain date.
Connect it to your software
Your ERP, CRM or AI agent seals, sends and checks through the API.
What you pay for separately, in one account
Prices published by each company on its website, billed annually, checked on 28 October 2026.
| AIM CODEX | DocuSign | PandaDoc | |
|---|---|---|---|
| Entry price | €0 · Professional €2.99/month | $11/month (Personal) | $19/month (Starter) |
| Sends | No limit, even free | 5 a month on Personal; 100 per user per year on Standard | Unlimited from the web app; via API, with credits |
| Team | Firm, €7.99/month: the whole team, never per person | $30 per user per month (Standard) | $49 per user per month (Business) |
| Qualified signature (QES) | No: a simple signature with a qualified timestamp, or your certificate. When it is enough | On the Enhanced plan, on request | On Business: $5 per signer, in packs of 10 |
- The proof travels inside the PDF and is checked with an open standard, without us.
- A European company, data hosted in the EU: Biomag, in Vitoria-Gasteiz; servers in Amsterdam. Some providers are US companies: who and why.
- Proof of receipt, diplomas and legal review included: elsewhere, another tool and another bill.
Sources: docusign.com and pandadoc.com. Their prices are in dollars and may change; ours exclude VAT and are on Pricing.
How it works
Upload or create the document
The PDF you already have, or a template: quote, contract, diploma.
Send the link
By WhatsApp or email, to one person or several. If you change it, the same link shows the new version.
They sign or accept
On their phone, no account: they type their name and sign. Or decline, or propose changes.
You keep the proof
A sealed receipt with the exact version, the certified date and who accepted. We let you know right away.
What the recipient sees
- Your document, first and large.
- Who it’s from, and that it’s the original, without a comma changed.
- A button to sign or accept it with their name. Or to tell you what they’d change.
- How long it’s valid; if it expires, it shows.
- Download it as a PDF and check it themselves, or with their AI (“Ask Claude”), trusting no one.
- In their language (36 available), nothing to install.
Why it’s worth more than a PDF by email
The exact version
What was signed or accepted is sealed. If anyone later changes a figure, the check detects it.
A date certified by a third party
Every signature and acceptance carries a qualified timestamp (eIDAS) from a provider on the EU trusted list, and is also anchored in Bitcoin.
Anyone can check it, without us
The other party, your accountant or a judge check it in one click here, or offline with the PDF (PDF/A-3b, proof inside). The proof doesn’t depend on CODEX existing.
Electronic signature, no fuss
A simple electronic signature (eIDAS, art. 25) with its receipt, and with your digital certificate when you need it. Where the law requires a qualified signature, we tell you plainly.
Everything it does, in case you need it
The essentials are above. This is the rest, by family: open them when you need them.
Signing contracts
- Several people sign, in order, each from their phone and without an account
- You, with your own certificate or national ID card, when the document calls for it
- In-person signing on your phone or tablet, even if the client has no email
- Signature boxes placed on the right page
- A reminder to whoever has not signed yet, or cancel the request
- Links that expire, with an access code or a limited number of uses
Quotes and jobs
- Your client accepts, declines or proposes changes; each new version, on the same link
- Deposit in euros with a payment QR or IBAN, and its receipt once you are paid
- Condition report with photos sealed from your phone: building work, rentals, workshops
- Handover report: the client confirms the job, with any reservations
- Verified reviews from clients who really accepted, and your public page
- What is still waiting for acceptance, with a WhatsApp nudge in one tap
Notices and what you receive
- To one person or hundreds: who opened it, who confirmed it and who did not Professional
- A reminder to whoever has not confirmed; close and reopen the campaign
- Add recipients later, or paste a table with all of them
- A sealed acknowledgement dossier, for when you need to prove it Professional
- Each recipient gets the emails in their own language
- Your inbox: what others send you arrives with its fingerprint and a certain date
Diplomas and certificates
- In batches, from a table, and revocable if needed Firm
- Anyone checks them in one click, also with the printed QR code
- In the standard W3C Verifiable Credentials format, as well as PDF
- A “verified” badge for your website
- Analytics: how many times each one has been checked Firm
The proof
- Every document has its SHA-256 fingerprint: it changes if a single letter changes
- Qualified timestamp (eIDAS) on signatures and acceptances, and an anchor in Bitcoin
- PDF/A-3b with the proof inside: it can be checked offline and without us
- Seal only the fingerprint, without uploading the document
- Expert evidence file for court and a sealed monthly archive of everything you issued Firm
- A qualified seal on a specific document, whenever you ask for it Firm
Drafting and reviewing
- More than twenty templates: quote, proposal, NDA, engagement letter, reports, GDPR texts…
- Your own templates, a blank document or a presentation
- Legal text review: what is missing and what is not needed, with the article that requires it
- AI that drafts or improves a text; you review it before sealing
- Meeting minutes, from the recording Firm
Your account, your team and your software
- Your brand and your verified identity for whoever receives Professional
- Your whole team inside, with roles and a record of who did what; also several offices Firm
- Two-step verification to sign in
- Erase a signer’s data (GDPR), with a record that it was done
- API and connection with AI assistants (MCP) for your software
- Webhooks: your software hears about every signature or acceptance at once Firm
Who it’s for
Trades, installers and workshops
The quote accepted at the visit, and every change order accepted separately.
Agencies and consultancies
Proposal, contract and scope signed: for when the “while you’re at it” arrives.
Advisers and law firms
Signed engagement letters, and notices to clients with proof of receipt.
Real estate and rentals
Reservations, contracts and addenda signed by several parties, each from their phone.
Academies and training
Diplomas and certificates checked in one click, issued in bulk.
Companies and teams
Internal policies, circulars and meeting notices: who read them and who confirmed.
How it works inside
Every document has a unique SHA-256: its fingerprint, which changes if a single figure changes. A time-stamping authority signs that fingerprint with the exact time (for acceptances, an eIDAS qualified provider), and the fingerprint is also anchored in Bitcoin’s public chain with OpenTimestamps: not even we could change the date.
The method is an open standard: anyone can check it without AIM CODEX. What sets it apart.
Trust you can check
What we claim, verified
Every figure on this site, with the evidence behind it.
Service status
Every component, checked now, and a full walkthrough every hour.
Where your data lives
In the European Union. Who processes it and why.
Security, no fine print
How we protect your documents and who can see them.
Works with: AutoFirma and your FNMT certificate or Spanish DNIe · Sectigo, a qualified provider on the EU trusted list · OpenTimestamps and Bitcoin · Bizum and bank transfer · WhatsApp and email · Claude and other AI assistants (MCP) · your ERP or CRM, via API.
Made in EuropeA European company. Data in Europe. And a proof that depends on no one.
CODEX is built by AIM, the software division of Biomag: a Spanish technology company since 1987, based in Vitoria-Gasteiz, with its own brands —Mars Gaming, Tacens, Anima— selling in several European countries. We know what it's like when a client disputes, a supplier denies an order or a distributor argues an invoice: CODEX comes from there. We built it because AI has made forging any document trivial, and a legacy signature proves who signs, but not that the document hasn't been altered or that it existed on a given date.
- The company
Spanish, headquartered in Vitoria-Gasteiz. There's a name, a tax ID and an address behind it.
Company details - The data
In the European Union: the app and the database in Amsterdam; email is sent from Ireland.
Check it live - The rules
GDPR with a processing agreement and a public list of who processes what. The AI doesn't keep your documents or train on them.
Who processes your data - The proof
Sovereign: an open standard, and the PDF carries its own proof. It can be checked without us and without anyone's permission.
The open standard
No small print: some providers are US companies with servers in the EU, and the AI still runs outside the EU while it moves to its European region. What's European and what isn't yet
Unlimited documents. Free, forever.
Send as many contracts and quotes as you like, with as many signers as needed: no counter, no card. Every signature with its sealed receipt and its qualified timestamp.
If you want your client to see your brand and your verified identity, the paid plan costs €2.99 a month billed annually. No lock-in: pay monthly and cancel whenever, or go yearly and save 30% (40% on the 2-year plan).
- Quotes and acceptances with no counter
- Receipt with a qualified timestamp
- See when they open it; we tell you when they accept
- Several signers, in order
- Everything in Free, plus:
- Your client sees your name, not ours
- Verified identity, not self-declared
- Acknowledgements of receipt with a sealed dossier
- Everything in Professional, plus:
- Invite your team · you never pay per person
- Batch generation and bulk diplomas
- Verification analytics
What everyone wants to know.
Is what gets signed this way valid?
Yes. A contract or an accepted quote binds the same whether signed on paper or on a phone, and signing in the link is a simple electronic signature (eIDAS, Article 25.1). Article 46 of eIDAS prevents it from being refused as evidence solely because it is electronic. The receipt states which version was accepted, by whom, when and from where, with a qualified timestamp from a provider on the EU trusted list. Far stronger than an “OK” on WhatsApp. What it is not: a qualified signature; and we are not a qualified trust service provider. If a law requires a qualified signature for your case, we explain it here.
What if my client wants to change something?
From the same link they propose changes (amount, timing, scope) or decline with a reason. You make a new version and it reaches them through the same link: they always see the latest, and it is recorded which one they accepted.
Can I use my usual documents?
Yes. Upload the PDF from your invoicing tool, Word or spreadsheet, and it is sent as it is, sealed. Or use a template: a quote with line items, VAT and validity, or a diploma.
Does my client need to sign up?
No. They open the link on their phone or computer, read, type their name and accept. Nothing to install.
What does it cost?
Nothing to send documents and get them signed or accepted, with no limit. The paid plan (€2.99/month billed annually) removes our brand, adds yours and verifies your identity, so your client doesn’t see “self-declared issuer”. See plans.
How is it different from DocuSign or Signaturit?
For everyday work —contracts, engagements, quotes, NDAs— what you use in them is a simple signature, the same legal level as CODEX, but here with no send counter and no per-user pricing. And the proof travels inside the PDF and can be checked without us. If a law requires a qualified signature for every signer, you need a qualified provider for that; we tell you when.
Is my data mine?
Yes. It is stored in the European Union (Amsterdam), under a data processing agreement and a public list of who handles what. Export everything whenever you want, and delete the account from Settings.
Can I archive it for years?
Yes. The PDF CODEX issues is PDF/A-3b compliant (ISO 19005-3), the long-term archive format administrations and courts ask for. Check it yourself with veraPDF, the industry validator. And it carries its proof inside: the sealed content and a checker that works offline. Accessible: Designed for WCAG 2.1 AA, the website and the page your client receives.
What does “anchored in Bitcoin” mean?
Besides the timestamp, each document’s fingerprint is recorded in Bitcoin’s public chain. That way its date depends on no company, not even us. You don’t need to know anything about crypto or pay anything.
Send your next document this way
Free and unlimited: contracts, quotes, proof of receipt, diplomas, GDPR clause review, your sealed inbox and checks from an AI (MCP).