Proteger PDF
NuevoProteja su PDF con una contrasena
Cómo usar Proteger PDF
- 1Sube un PDF
- 2Ingresa una contraseña y confírmala
- 3Haz clic en Proteger PDF
- 4Descarga el archivo protegido
Acerca de Proteger PDF
Proteger PDF cifra tu documento con una contraseña usando pdf-lib. Los destinatarios necesitan la contraseña para abrir el archivo. Ningún archivo se sube — todo se ejecuta en tu navegador.
Características principales de Proteger PDF
- Procesamiento Protect Pdf rápido y preciso
- Sin instalación requerida — funciona en navegador
- Gratis sin limitaciones
- Privacidad — los datos nunca salen del navegador
- Compatible con móvil y escritorio
- Resultados instantáneos con vista previa
- No watermarks or content changes applied
- No account or installation required
Formatos compatibles
Formatos de entrada
Formatos de salida
Only user (open) password protection is applied. The PDF must not already be encrypted — unlock it first if needed.
Ejemplos
Protect a contract before emailing
Add a password to a PDF contract so only the intended recipient can open it.
Entrada
Unprotected contract PDF
Salida
Password-protected PDF — recipients need the password to open
Secure a financial report
Encrypt a sensitive financial PDF before uploading to a shared drive.
Entrada
Financial report PDF
Salida
Encrypted PDF with password access control
Casos de uso comunes
- Tareas profesionales Protect Pdf
- Cálculos cotidianos rápidos
- Fines educativos y aprendizaje
- Productividad empresarial
- Proyectos personales y pasatiempos
- Securing academic thesis drafts during external review
Solución de problemas
Resultados inesperados
Solución
Verifique el formato de entrada y asegúrese de que todos los campos requeridos estén completos.
Herramienta no funciona
Solución
Limpie caché del navegador y actualice. Asegúrese de que JavaScript esté activado.
Trying to protect a PDF that is already password-protected
Solución
Unlock the PDF first with the Unlock PDF tool to remove the existing password, then add the new one.
Preguntas frecuentes
¿El cifrado se hace en un servidor?
No. pdf-lib cifra tu archivo completamente en tu navegador.
¿Qué pasa si olvido la contraseña?
No hay recuperación. Guarda tu contraseña de forma segura.
What encryption algorithm is used?
pdf-lib applies RC4 128-bit encryption, which is the standard user-password protection scheme supported by Adobe Acrobat, macOS Preview, and all major PDF viewers.
Can I restrict printing or copying while still allowing opening?
Currently only user (open) password protection is supported. Owner permission restrictions — such as disabling printing or text copying — are not separately configurable in this tool.
Will password protection work in all PDF readers?
Yes. Standard PDF user password encryption is a core part of the PDF specification and is supported by Adobe Acrobat, macOS Preview, browser PDF viewers, mobile apps, and all major PDF software.
Can I protect a PDF that already has a password?
No. The tool requires an unprotected PDF as input. Use the Unlock PDF tool to remove the existing password first, then apply the new password.
Can the password contain spaces or special characters?
Yes. Any printable character is allowed including spaces, punctuation, and symbols. Avoid extremely unusual Unicode characters for maximum compatibility across PDF readers.
What is the maximum password length?
Standard PDF encryption supports passwords up to 32 characters. For strong security, use at least 12 characters combining uppercase letters, lowercase letters, numbers, and symbols.