
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.

Exam.net
StudySpaces is a white-label tutoring and test prep platform with built-in SAT, ACT, etc. curriculum, auto-graded mock exams, and a branded student portal.

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 | studyspaces.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 StudySpaces. 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 StudySpaces since Nov 2026.
When comparing File-Extensions.org and StudySpaces, 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 StudySpaces:

A platform for creating and conducting exams and assessments.
Compare Exam.net to File-Extensions.org or StudySpaces:

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

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

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