PDF Sign Pad

Preguntas frecuentes

Respuestas a las preguntas más comunes sobre cómo firmar PDF con PDF Sign Pad.

Cómo funciona

  1. Carga tu PDF

    Suelta tu PDF en la ventana del navegador o elige un archivo — no se sube nada.

  2. Añade tu firma

    Dibuja, escribe, sube o reutiliza una firma guardada.

  3. Colócala en la página

    Arrastra, cambia de tamaño o gira tu firma (o añade texto) en cualquier lugar de cualquier página.

  4. Descarga el PDF firmado

    Descarga tu PDF terminado — sigue estando solo en tu dispositivo.

¿Se sube mi documento a algún sitio?

No. Tu PDF y tu firma se procesan por completo en tu dispositivo y nunca salen de tu navegador.

¿Es esta una firma legalmente vinculante?

PDF Sign Pad crea una firma electrónica visual simple. No es una firma digital certificada o cualificada — consulta nuestro Aviso legal.

¿Funciona en mi idioma, incluido el árabe?

Sí. La interfaz está disponible en 7 idiomas, incluido el árabe de derecha a izquierda.

¿Qué ocurre con mi firma guardada?

Si activas "Guardar en este navegador para reutilizar", tu firma se guarda solo en tu propio navegador — nunca en nuestros servidores — para que puedas reutilizarla la próxima vez. Está desactivado de forma predeterminada y puedes eliminarla cuando quieras desde la pestaña Guardadas.

¿Qué tipos de archivo puedo usar como firma?

Puedes dibujar con el ratón o el dedo, escribir tu nombre con una fuente de firma o subir una imagen PNG, JPG, WebP o SVG. Un PNG con fondo transparente suele verse mejor.

¿Hay un límite de tamaño de archivo?

Sí — los PDF de hasta 25 MB se abren directamente en tu navegador. Los archivos más grandes no son compatibles, ya que todo se ejecuta en tu propio dispositivo en lugar de un servidor.

¿Qué pasa con mi documento después de cerrar la pestaña?

No se guarda nada. Tu documento, cualquier texto que añadas y tu firma solo existen en la memoria de tu navegador durante esa sesión — cerrar la pestaña, actualizar la página o pulsar "Empezar de nuevo" los elimina por completo.

Algunas respuestas a continuación se muestran solo en inglés — el resto de la interfaz está disponible en los 7 idiomas admitidos.

Can I use PDF Sign Pad to sign a lease, an NDA, a job offer, or a school consent form?

For everyday, self-sign documents like these, a simple electronic signature is usually accepted: draw, type, or upload your mark, place it on the page, and download a finished, signed PDF. It's not built for documents that legally require notarization, witnessing, or a wet-ink signature — wills and certain court filings, for example, usually need something more than a simple electronic signature. This isn't legal advice — see our for what a simple electronic signature is and isn't, and talk to a licensed attorney if you're unsure about your specific document.

Can I sign a PDF online for free — without creating an account?

Yes. PDF Sign Pad is free to use, with no account, no sign-up, and no email address required — not even to save a signature for later. Open the tool, drop in your PDF, sign it with a drawn, typed, uploaded, or saved signature, and download the finished file. Nothing about your document is uploaded anywhere in the process — everything happens in your browser. See the for exactly how it works.

Can I sign a PDF on my phone?

Yes. PDF Sign Pad works in any modern mobile browser — open your PDF, then draw your signature with your finger, type it in a signature font, or upload an image, exactly as you would on a laptop. Placing, resizing, and rotating your signature or text works with touch the same way it works with a mouse. There's no app to install, and the same on-device privacy applies: your document never leaves your phone. See the for the step-by-step.

If I save my signature, can I use it on a different device or browser?

No. A saved signature is stored only in that one browser's local storage — never on a server, and never anywhere we could sync it for you. Switch to a different browser, a different device, or clear your browser's site data, and you'll need to save it again from scratch. It's a deliberate privacy tradeoff: keeping your saved signature off any server is what keeps it private, even though it means it won't follow you from browser to browser. See our for the full detail.

Does signing create a new PDF, or change my original file?

Signing never touches your original file. PDF Sign Pad only ever works with the copy loaded into your browser's memory — the file already saved on your device or in the cloud is untouched unless you choose to overwrite it yourself. When you click Download, the app "flattens" your signature and any text you've added — permanently baking your marks into the pages — and gives you a brand-new, finished PDF to save wherever you like. See the for more on how this works.

What if my PDF is bigger than 25 MB?

PDFs over 25 MB aren't supported today. Because everything runs on your own device rather than a server, there's no server-side trick to lift that ceiling — the limit exists to keep the app fast and reliable in a browser tab. If your file is larger, a quick fix is to shrink it first: our sibling tool, pdf-combiner.com's Compress tool, reduces a PDF's file size (also entirely in your browser) so you can bring it back under 25 MB and sign it here.

My PDF won't open, or my signature isn't showing up — what should I do?

Two different issues, two different fixes. If your PDF won't open at all, it's usually damaged or password-protected — PDF Sign Pad shows a plain error message and doesn't attempt to unlock protected files, so try removing the password first or opening a different copy of the file. If your signature isn't showing up, check that you actually clicked "Add signature" (or "Add text") after drawing, typing, or uploading it, and that you're looking at the page you placed it on — signatures and text are added per page, one at a time. See the if you want a step-by-step refresher.