File & Data Tools · Browser-based utility
File Size & Type Analyzer Online Free
Inspect multiple files for filename extension, MIME type, individual size and total selected size.
What this tool does
Inspect multiple files for filename extension, MIME type, individual size and total selected size.
People often describe this task with phrases such as file size checker, mime type checker, file type analyzer and file size calculator. This page uses those terms only where they refer to the same underlying function.
How to use the File Size & Type Analyzer
- Open the File Size & Type Analyzer page and select or enter the source data required by the tool.
- Review the available controls instead of accepting defaults blindly when the destination has a size, format, layout or compatibility requirement.
- Run the operation and inspect the preview, status or generated result before treating it as final.
- Download or copy File report and verify it in the destination application, browser, viewer or workflow that will actually use it.
Use the interactive tool above for the actual operation. The documentation below explains what the controls mean, what changes in the file/data, and how to troubleshoot common results.
Settings and capabilities explained
| # | Control or capability |
|---|---|
| 1 | Multiple-file selection |
| 2 | Extension display |
| 3 | MIME type display |
| 4 | Per-file size |
| 5 | Total size |
Supported input and output
- Input: arbitrary files
- Output: file-information report
How it works technically
Browser file/data utilities work on byte sequences or text representations. Correct interpretation depends on the exact format, encoding and algorithm used.
Filename extension and MIME type are separate concepts; an extension is part of the name while MIME describes a media/content type.
Reported size is the file byte length available to the browser.
Common use cases
- Audit upload batches
- Check a folder’s total selected size
- Compare file types
- Identify unexpectedly large files
Choosing the right settings
- Do not assume a renamed extension changes the underlying MIME/content type.
Common problems and fixes
MIME type is blank or generic
Some local files may not expose a specific MIME type through the browser File object.
Browser processing and privacy notes
The source code for this build performs the documented file transformation or analysis from browser JavaScript/Web APIs, and the video tools load FFmpeg.wasm for media processing. The site also contains third-party analytics, font/CDN and advertising scripts that can make ordinary network requests. Therefore, the precise claim made here is limited to the tool routine: it does not need a separate AutoClip file-upload API in order to perform the documented local operation.
For sensitive files, you should still use your browser’s developer tools or network controls if you need to independently verify the behavior of every third-party request in your environment.
Frequently asked questions
What does the File Size & Type Analyzer do?
Inspect multiple files for filename extension, MIME type, individual size and total selected size.
What input and output does it use?
Input: arbitrary files Output: file-information report Outputs include File report.
Do I need to install desktop software?
No desktop installation is required for this page. The interactive workflow runs from the web browser. Some advanced media features load browser-side JavaScript/WebAssembly libraries when needed.
Are selected files processed through the tool interface?
Yes. The implementation reads selected files with browser APIs and performs the documented transformation or analysis in the page. External libraries, analytics and advertising scripts may make their own network requests, so this statement is about the file-processing routine itself.
MIME type is blank or generic?
Some local files may not expose a specific MIME type through the browser File object.