Alternative to FranceConnect+ for signing on INPI (working in 2026)

Many users believe that FranceConnect+ is mandatory for signing an INPI formality. That's false. The Guichet Unique requires an eIDAS qualified electronic signature within EU Regulation 910/2014. FranceConnect+ is one way to obtain it — not the only one.

This article covers the legally equivalent alternatives to FranceConnect+ for signing your Guichet Unique PDF summary. All have the same legal result: a qualified-signed PDF, accepted instantly by INPI.

Why look for an alternative to FranceConnect+?

Several legitimate reasons push for an alternative:

• The service is down: blank page, "service unavailable" orange banner, infinite loading loop. Documented outages especially at month-end and approaching fiscal closings.
• Your La Poste digital identity was rejected or its assurance level is insufficient for the INPI Guichet Unique.
• You don't have time to make a post office appointment for physical certification.
• You live abroad and can't travel to a French post office.
• Your formality is urgent: a running legal deadline (1 month after AGM for an articles amendment, for example).

In all these cases, at least 3 alternatives exist that produce a legally equivalent signature.

Alternative 1: a qualified eIDAS specialist for INPI

The fastest solution. You download your PDF summary from the Guichet Unique, drop it on a service like SignerSynthèse.fr, the provider applies an eIDAS qualified signature, and you receive the signed PDF by email in 2 minutes.

The PDF signed this way is legally identical to a PDF signed via FranceConnect+: same European regulation, same qualified level, same validity in court. The INPI Guichet Unique automatically checks the signature level on cryptographic reading of the PDF — it accepts indifferently FranceConnect+ signatures and those produced by another qualified provider.

Conditions to make it work

• The provider must be listed on the EU Trust List (the European Trust List maintained by the European Commission and ANSSI).
• The applied signature level must be qualified, not "non-qualified advanced".
• The identity journey must be ANSSI-certified PVID or equivalent (front/back ID photo + selfie + SMS code).

At SignerSynthèse.fr, these 3 conditions are met. Our technical provider is Cryptolog International (Universign, by Signaturit Group), present on the EU Trust List.

Alternative 2: La Poste Digital Identity certified level (without FranceConnect+)

You can also obtain a qualified signature via the La Poste Digital Identity app, going directly through their portal (without FranceConnect+ as intermediary). This avoids FranceConnect+ bugs but keeps the same technical base.

Limits:

• Mandatory "certified" level (physical post office verification).
• 2 to 5 working days for certification.
• La Poste mobile app to install and maintain.
• If your Digital Identity was rejected, this alternative is unavailable.

This route works if you're not in a hurry and your La Poste identity already works.

Alternative 3: a qualified certificate on USB token / smart card

For professionals who sign regularly (accountants, lawyers, large structure directors), qualified certificates on physical support (USB token or smart card) exist. French recognised issuers: Certigna, Certinomis, Certeurope.

Limits:

• Cost: €100 to €250 ex. VAT for a 1- to 3-year certificate.
• Time to obtain: 1 to 4 weeks (physical identity verification required).
• Client software to install (Adobe Sign, FileSignerXP, Citizen Portal).
• Sometimes capricious browser compatibility.

This alternative is industrial but poorly suited for a single urgent formality.

Alternative 4: Yousign, DocuSign or other qualified SaaS platform

SaaS platforms like Yousign or DocuSign also offer qualified eIDAS signatures in their Pro+ or Business Pro plans. They however target companies with recurring use (monthly volume) rather than an individual signing a one-off formality.

Minimum entry ticket around €300 to €600 ex. VAT/year to access qualified — not profitable for a single formality. See our pricing comparison.

How to know if the alternative is truly equivalent?

Three simple checks:

1. Is the provider on the EU Trust List?

Verify on eidas.ec.europa.eu/efda/tl-browser. If the name appears in the French list of Qualified Trust Service Providers, INPI accepts the signature.

2. Is the applied signature level "qualified"?

The signed PDF must contain a signature of level QESig (Qualified Electronic Signature). If you sign yourself via free Adobe Sign, the level will be "simple" — refused by INPI. See our comparison advanced vs qualified eIDAS signature.

3. Is identity verification PVID-compliant?

The journey must follow the PVID reference (Remote Identity Verification Provider) of ANSSI: front/back photo of an official ID + selfie + SMS code. If they only ask for an email, run away: the result will be "advanced" at best, not qualified.

Which alternative to choose?

And if the Guichet Unique doesn't recognise the alternative?

It's rare, but can happen in two cases:

• The used provider is not actually qualified (non-qualified advanced signature disguised as qualified).
• The PDF was modified after signing (open-resave in Adobe Reader, for example), which invalidates the cryptographic signature.

If your INPI summary is rejected while signed, first verify the provider's nature (EU Trust List), then ensure the PDF wasn't altered between signing and re-uploading.

Conclusion

FranceConnect+ is not mandatory for signing an INPI formality. It's an option among others. When it doesn't work, you can use a specialised qualified eIDAS provider (the fastest route), a physical USB token certificate (industrial but slow), or an enterprise SaaS platform (only profitable with high volumes).

For a one-off formality, the pay-as-you-go provider remains unbeatable: 2 minutes, €29 ex. VAT, 100% accepted by INPI.

Official sources

• INPI Guichet Unique
• FranceConnect+ — official documentation
• EU Trust List — qualified alternative
• ANSSI — PVID reference
• EU Regulation 910/2014 eIDAS