UDF (UYAP Document Format) is a proprietary document format used by Turkey's national judiciary informatics system (UYAP). Documents created with the UYAP Document Editor are saved with a .udf extension. These files can only be opened with the UYAP Document Editor, which is only available on computers connected to the UYAP network.

How do I open a UDF file?

UDF files can be opened with the UYAP Document Editor (only available on UYAP-connected computers). For everyone else, the easiest way is to convert UDF to PDF using convertudftopdf.com — a free, browser-based tool that requires no installation.

Is it safe to convert UDF files online?

Yes, convertudftopdf.com processes files entirely in your browser using JavaScript. No files are uploaded to any server. Your legal documents remain completely private.

What is UDF? The Turkish UYAP Document Format Explained

Last updated: April 18, 2026 · 6 min read

If you've received a file with a .udf extension from a Turkish lawyer, court, or legal professional, you're likely wondering what it is and how to open it. This guide explains everything you need to know about the UDF file format and Turkey's UYAP system.

UDF: UYAP Document Format

UDF stands for UYAP Document Format. It is a proprietary document format created by and for Turkey's national judiciary informatics system. Every legal document produced within the UYAP Document Editor — petitions, court decisions, hearing minutes, indictments, notifications — is saved in this format.

In brief: UDF is to the Turkish legal system what .docx is to Microsoft Word — except it can only be opened by one specific application that's restricted to the UYAP network.

What is UYAP?

UYAP (Ulusal Yargi Agi Platformu) — the National Judiciary Informatics System — is Turkey's comprehensive digital judiciary platform. Developed by the Ministry of Justice starting in the early 2000s, it is one of the most extensive e-justice systems in the world.

UYAP by the Numbers

200,000+ active users (judges, prosecutors, lawyers, court staff)
85+ million citizens with access through e-Government portal
1,000+ connected courthouses and institutions
20+ years of operation and development

What UYAP Does

Case management: All cases from filing to resolution are managed digitally
Document creation: The UYAP Document Editor creates legal documents in UDF format
Electronic signatures: All official documents are signed with qualified e-signatures
Lawyer portal: Lawyers can file petitions, track cases, and receive notifications online
Citizen portal: Citizens can check case status and access court information
Video hearings (SEGBIS): Remote court hearings via video conferencing
Electronic notifications: Legal notifications delivered digitally

Technical Details of UDF Files

UDF files have the following characteristics:

File extension: .udf
Internal structure: ZIP-compressed archive containing document data
Content format: Rich text with formatting (bold, italic, underline, fonts, alignment)
Table support: Legal documents frequently include structured tables
Character set: Full Turkish character support (including special characters like ş, ğ, ı, ö, ü, ç)
Template system: Pre-built templates for petitions, decisions, minutes, etc.

How to Open a UDF File

Option 1: UYAP Document Editor (Official)

The official way to open UDF files is through the UYAP Document Editor. However, this application is only available on computers connected to the UYAP network — typically found in courthouses, prosecutors' offices, and law firms with UYAP access.

Option 2: Convert to PDF (Recommended)

The most practical way to view UDF files outside the UYAP system is to convert them to PDF. This preserves the document's formatting while making it readable on any device.

Convert UDF to PDF Instantly

Free, secure, and browser-based. No files are uploaded to any server.

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UDF vs PDF Comparison

Compatibility: PDF works on every device and operating system. UDF only works with the UYAP Document Editor.
Mobile support: PDF has full mobile support. UDF has none.
Browser support: PDF can be viewed in any web browser. UDF cannot.
Printing: PDF can be printed from any printer. UDF requires the UYAP Editor.
Email sharing: PDF recipients can always open the file. UDF recipients may not be able to.
Archiving: PDF/A is an international archiving standard. UDF is tied to the UYAP ecosystem.

Who Needs to Convert UDF Files?

Lawyers sharing case documents with clients who don't have UYAP access
Legal professionals archiving documents in a universal format
Law students working with case materials during internships
Citizens who received UDF files from their lawyers or courts
International legal teams dealing with Turkish court documents
Academics and researchers studying Turkish legal proceedings

Frequently Asked Questions

Can I open a UDF file on my phone?

No, UDF files cannot be opened directly on mobile devices. However, you can convert them to PDF using convertudftopdf.com on your phone's browser, and then view the resulting PDF.

Is the UDF format the same as ISO UDF (Universal Disk Format)?

No. Despite sharing the same abbreviation, UYAP's UDF (UYAP Document Format) and ISO 13346 UDF (Universal Disk Format, used for DVDs and Blu-rays) are completely different formats with no relation to each other.

Is it safe to convert legal documents online?

With convertudftopdf.com, yes. Our converter processes files entirely in your browser using JavaScript. No data is sent to any server. Your sensitive legal documents remain completely private on your own device.

Can I convert multiple UDF files at once?

Yes. convertudftopdf.com supports batch conversion. Select or drag multiple files, click "Convert All," and download them individually or as a ZIP archive.

Is the conversion free?

Yes, completely free. No registration, no subscription, no limits. Convert as many files as you need.

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