Are my PDFs uploaded?

No. Pages are copied with a client-side PDF library in this tab. Close the tab to drop the bytes.

Why did merge fail on a locked file?

Password-protected PDFs cannot be copied until they are decrypted. Use Unlock PDF with the password you already know, then merge the unlocked copies.

Files merge in list order (top to bottom). Use the arrows to reorder whole files, not individual pages.

Up to 10 files, 25 MB each. Very large page counts can exhaust tab memory; split the job if the tab freezes.

Utill.net

Unir PDF

combina PDFs en el navegador

Junta varios PDF, reordena y descarga. Los archivos no salen del dispositivo.

Esta conversión se ejecuta solo en tu navegador; no se sube nada.

Arrastra PDFs o elige abajo

Examinar archivos

Archivos—
Original—
Resultado—

¿Qué es esta herramienta?

A browser PDF merger. You add PDFs, reorder the file list, and download a single document whose pages are concatenated in that order. Processing stays on the device.

It does not edit text, add watermarks, or split pages. It does not crack encryption.

Casos de uso comunes

Combine signed scans and a cover letter into one attachment
Join chapter exports from a printer driver
Stack receipts before an expense upload that allows only one PDF

Cómo usar

Drop two or more PDFs (or use Sample for two tiny demo files).
Reorder with the up/down buttons; remove files you do not want.
Download PDF. The browser builds the merged file locally.

Ejemplos

Input	Notes
`a.pdf` then `b.pdf`	All pages of A, then all pages of B.
Reorder B above A	Output starts with B’s pages.
Encrypted `secret.pdf`	Merge fails until you unlock it with the known password.
11th file	Rejected — max 10 PDFs per run.

Errores prácticos

Forms and some annotations may flatten or drop depending on how they were saved; check the output.
Bookmarks and some metadata from source files are not a guaranteed merge of every dictionary.
Unique gotcha: merge copies pages, not “print as booklet” imposition. Duplex layout stays whatever each file already was.

Referencias

Última revisión: 2026-08-30

Preguntas frecuentes

Are my PDFs uploaded?: No. Pages are copied with a client-side PDF library in this tab. Close the tab to drop the bytes.
Why did merge fail on a locked file?: Password-protected PDFs cannot be copied until they are decrypted. Use Unlock PDF with the password you already know, then merge the unlocked copies.
Page order?: Files merge in list order (top to bottom). Use the arrows to reorder whole files, not individual pages.
Limits?: Up to 10 files, 25 MB each. Very large page counts can exhaust tab memory; split the job if the tab freezes.