Sigillarium

Your documents,protectedlocally

For your ID papers, proofs and application files. Local document storage, customizable watermarks, and biometric protection. A local alternative to cloud solutions.

Identity card and proof of address crossed by a “Rental application only” watermark, sealed with a wax seal

Everything you need

To secure and manage your documents with complete confidentiality

100% Local Storage

Your documents stay on your device. Nothing is sent to our servers: they only leave it if you decide so.

Customizable Watermarks

Apply VISIBLE watermarks (text, color, position, opacity) to your images and PDFs.

Photo from the Camera

Photograph your paper documents with your phone's camera and protect them locally.

Private Vault

Store your documents in a secure vault directly on your phone.

Integrated Search

Find your documents by name, date, or file type with built-in search and sorting.

No Account

No email, no password, no sign-up. The vault opens with your phone's biometrics or passcode.

AES-256 Encryption

Your files are encrypted at rest with AES-256-GCM using a key unique to your device, and the vault database is encrypted with SQLCipher.

Encrypted Backup

Export your whole vault to an encrypted archive, keep it wherever you like, and restore it on a new phone. Free for everyone.

Your Privacy Protected

100% Local Documents

Your documents stay on your device. They only leave it if you share or back them up yourself.

No Account to Create

The app opens straight away. The key that encrypts your vault stays in your phone's hardware keystore and never leaves it.

No Personal Data

We collect no name, no email, no password. We receive NO documents.

GDPR Compliant

Full respect for your privacy and European data protection regulation.

What a watermark does — and what it does not

A visible watermark does not prevent a document from being reused. It can be cropped, retouched, and today's AI tools remove it quickly and well. We would rather tell you here than let you find out at the worst possible moment.

What it does do:

  • It states an intent. "Copy given to this organisation, on this date, for this purpose": the document now has a declared use, and any other use is visibly a diversion.
  • It discourages opportunism. Most misuse does not come from determined forgers, but from people who found a convenient file.
  • It leaves a trace. Removing a watermark is a deliberate act, hard to pass off as an accident in a dispute.

Burglaries happen, and we still lock our doors. A lock does not make theft impossible: it makes it harder, slower, and unambiguous.

The strong guarantee is elsewhere. The AES-256 encryption of your vault is not a deterrent, it is an impossibility: without your device or your backup key, your documents are unreadable — including to us.

Free vs Premium

Choose the plan that suits you

Free

€0 /month
✓ 10 documents maximum
✓ 50 MB storage
✓ Visible watermark, free text and adjustable opacity, standard style
✓ Photo from the camera
✓ Encrypted vault, biometrics or passcode
✓ Encrypted backup and restore
Download
RECOMMENDED

Premium

Monthly or yearly subscription
Price shown in the store before purchase
✓ Unlimited documents
✓ Unlimited storage
✓ Fully customizable watermark: font, size, color, rotation, position, shadow, outline
✓ Photo from the camera
✓ Encrypted vault, biometrics or passcode
✓ Encrypted backup and restore
Try Premium
✓ Cancel anytime

Coming Features

Guided Onboarding
Authenticity QR Code
Folder Tree

Download Sigillarium

Available soon on your favorite platforms

Version 1.0.0 | Last updated: September 2026