
FileInfo.com
FileProInfo
GroupDocs
Groupdocs.app
Convertio
File Converter
FileFormat.com
Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.

MTG Studio
Free MTG Commander deck builder, mana analysis, combo finder and opening hand tests.

Which is more popular?
Based on our record, File-Extensions.org seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | file-extensions.org | deckcipher.com |
| Pricing | — | |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using File-Extensions.org and DeckCipher. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


File-extensions.org lists following files for .3 extension:. Source: over 3 years ago
Tracking DeckCipher since Oct 2026.
When comparing File-Extensions.org and DeckCipher, you can also consider the following products.

FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Compare FileInfo.com to File-Extensions.org or DeckCipher:

MTG Studio is Magic: the Gathering deck and collection builder for Windows
Compare MTG Studio to File-Extensions.org or DeckCipher:

It's All About Files, Software, Online Tools - 100% Free
Compare FileProInfo to File-Extensions.org or DeckCipher:

GroupDocs is a web-based service for online document sharing, collaboration and management.
Compare GroupDocs to File-Extensions.org or DeckCipher:

A group of free document automation apps to view, parse, convert & compare popular file formats.
Compare Groupdocs.app to File-Extensions.org or DeckCipher:
