Ready-to-use widget
Camera, drag and drop, quality warnings and text in several languages. Works with React, Vue or plain HTML.
Add to your site
Add document uploads to your site in an afternoon.
Drop the widget into your page and let your users upload their documents. Your secret key never leaves your server.
Secure by design
Publishable keys only work on the domains you authorize and never give access to your data.
Single-use sessions
Your server creates a session that expires after 15 minutes and works for one document only.
How it works
Create a publishable key
From your dashboard, with the list of domains where it can be used.
Your server opens a session
With the template and your reference. It gets a temporary code.
The widget uploads the document
Straight from the user's browser to Constaia.
You get the result
On your server, with your reference, ready to save.
What never happens
- Your secret key never reaches the browserIf someone tries to use it on a web page, we reject it.
- No one reuses a sessionEach one is good for one document and expires on its own.
- No one uses it on another siteWe only accept requests from your domains.
A few lines of HTML
The widget is a standard web component. There are also versions for React and Vue.
index.html
<!-- 1. Tu servidor crea una sesión de un solo uso (POST /v1/sessions)
y entrega al navegador solo el client_secret, válido 15 minutos. -->
<!-- 2. El widget sube el documento; tu clave secreta nunca llega al navegador -->
<script type="module" src="https://cdn.jsdelivr.net/npm/@constaia/widget"></script>
<constaia-upload
session-token="{{ client_secret }}"
expect="es_dni"
lang="es">
</constaia-upload>Frequently asked questions
Do I need a server?
Only to open the session, which is a very short call. The file goes straight from the browser to Constaia.
Can I change how the widget looks?
Yes: text, colors and fonts adapt to your site.
And for the record…
Create your free account and validate your first document in five minutes. No credit card required.