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View a DEK file online, free

Open and read .DEK files online. View source, logs and text with syntax highlighting, search and line numbers, free.

Drop your .DEK file here

Opens your .DEK file right here.

Choose file
Up to 50 MB · 160+ text and code extensions
Instant. Opens in seconds
No sign-up. Just open it
100% free. No limits on use

What you get for a .DEK file

We don't have a dedicated viewer for this format, so we identify and inspect it instead — honestly, only what can be read from the file.

01

Drop your .DEK file

Choose it or drag it in. It's read right here in your browser.

02

We identify it

We read the magic bytes to tell what the file really is, its MIME type, and whether the name matches the contents.

03

See the details

Any metadata we can extract (dimensions, EXIF/GPS, document author and dates), a hex view, plus readable text and strings found inside.

What is a .DEK file?

Plain text that programs, servers and people write every day.

A .DEK file is a Magic: The Gathering Deck File created by Wizards of the Coast. It contains data representing a specific collection of cards used for gameplay within the game. These files are primarily opened and managed using Magic: The Gathering Online and MTG Studio.

Programs that open .DEK files

Windows
Magic: The Gathering Online, MTG Studio
.DEK format details
DeveloperWizards of the Coast

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Every viewer is free to use.

Frequently asked questions

Is my .DEK file uploaded anywhere?

No. The file is read and highlighted for you.

Why do some characters look wrong (é, ł)?

That usually means the file was saved in one encoding and opened in another. We detect UTF-8, UTF-16 and the Windows-1250/1252 code pages automatically and show which one was used.

Can it handle huge log files?

Yes, up to 50 MB. Only the lines on screen are drawn, so scrolling stays smooth. Syntax colours are switched off for files over 1.5 MB to keep things fast.

How do the log level filters work?

We find levels like ERROR, WARN, INFO and DEBUG on each line. Lines without a level, such as stack traces, stay with the entry above them, so filtering to errors keeps the full trace.

Can I edit the file?

This is a viewer. To change code, download it or copy it into your editor. Converting encodings and line endings is planned.

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