Foliato: Offline PDF Tools

Your PDF never leaves your device. Foliato is a complete set of offline PDF tools (merge, split, sign and more) that runs locally on your phone or tablet. No document is ever uploaded to a server.

VIEW YOUR PDFs
Foliato works as a PDF viewer and reader: continuous scroll, pinch-to-zoom, selectable text, pages fitted to your screen width, and it registers as your phone's default app to open PDF files from Mail, Files or Drive.

PASSWORD-PROTECTED PDFs: OPEN, PROTECT, REMOVE
Open password-protected PDFs in the viewer and in every tool, protect a PDF with a password (AES-256) or remove a password, or the restrictions on printing, copying and editing. Foliato asks for the password once and works on a copy in memory, and when you edit a protected PDF with another tool, the result keeps its password. PDFs that only carry restrictions open without asking. Sign with certificate also signs a protected PDF, and it stays protected. Everything happens on your device: a PDF password is never saved and never sent anywhere. If a PDF carries digital signatures, the app warns you first: protecting it or removing its password rewrites the file, and its signatures are no longer valid afterwards.

DIGITAL SIGNATURES: READ AND CREATE
Inspect the digital signatures a PDF carries: who signed it, with which certificate, whether the document changed after signing, whether the certificate chain holds together and, if you leave it on in Settings, whether the issuing authority has revoked the signer's certificate. For that check only the certificate's serial number is sent, never the document. The app always tells you what it checked and what it did not: a certificate not being listed as revoked does not mean it can be trusted. The Information sheet shows size, dates, author, PDF version and whether the document is protected.

SIGN PDF WITH A DIGITAL CERTIFICATE
Sign a PDF with your own digital certificate (.p12 or .pfx, for example from the Spanish FNMT): a real cryptographic signature in the standard PAdES format, with an optional visible stamp on one, several or all pages. When online, the signature includes a timestamp and the certificate is first checked for revocation; offline, it still signs. You can save your certificates encrypted on the device, but the password is never saved: it is asked for on every signature. It is an advanced electronic signature, not a qualified one.

12 PDF TOOLS, NO UPLOADS
• Merge PDF: combine several PDF files into one document
• Split PDF: extract just the pages you need
• Reorder: drag pages into a new order
• Rotate: fix a sideways or upside-down page
• Compress: shrink the PDF's size with an adjustable compression level
• Sign PDF: draw your signature once and place it on any page
• Sign with certificate: sign with your digital certificate
• Image to PDF: turn photos or JPGs into a PDF, one page per image
• Watermark: add a text watermark, then drag, resize, rotate and fade it
• Page numbers: pick the format, position and starting number
• Protect with password: require a password to open the PDF (AES-256)
• Remove password: remove the password, or the restrictions on printing, copying and editing

OFFLINE AND PRIVATE
Every tool works offline: no account, no ads, no analytics. Your files and your PDF passwords stay on your device from open to export. Only two features look things up online, and only when you use them: signing with a certificate (timestamp and revocation check) and the revocation check when you open a signature, which you can turn off in Settings. Neither ever sends your document or your full certificate.

FREE, NO CATCH
All 12 tools are unlimited from the first launch. No in-app purchases, no subscriptions, and Foliato never adds its own watermark to your files.

Foliato is available in English, Spanish, French and German, with light and dark mode.