UDF Studio — App Store Intelligence

UDF Studio is the complete, native toolkit for UYAP UDF documents on Mac, iPhone, and iPad — and everything is free.

VIEW
• Open and read UYAP UDF files with faithful formatting
• Full-text search
• Verify electronic signatures — signer, certificate and validity
• Quick Look and Share extension support

CREATE & EDIT
• Create new UDF documents and edit existing ones
• Bold, italic, underline, alignment, numbered and bulleted lists
• Tables, form fields and images in existing documents are preserved when you save

CONVERT & MERGE
• Convert PDF, Word and images to UDF
• Merge multiple files into a single UDF

PDF & TIFF TOOLS
• Open multi-page TIFF and PDF files
• Reorder, rotate and delete pages, then export as PDF

E-SIGNATURE (macOS)
• Electronically sign with your e-signature token (smart card)

Everything is free and runs entirely on your device — your documents are never uploaded.

App Store data shown here is sourced from Apple's public iTunes RSS chart feeds and the iTunes Lookup API, collected by Zing at regular intervals. Figures may differ from Apple's internal App Store Connect analytics.