File Information Reader
List selected file names, MIME types, byte sizes and browser-provided modification times. Processing takes place locally in your browser.
Start using
What File Information Reader does
List selected file names, MIME types, byte sizes and browser-provided modification times.
Worked example
Input
Select three local files
Result
A sortable metadata table
How the file is processed
The browser File objects expose metadata without reading or transmitting file contents.
Useful workflows
- Prepare test fixtures or inspect supported local files without uploading them.
- Preview filenames, paths and sizes before creating a new download.
- Keep the source file until the generated result opens and validates correctly.
Security and compatibility checks
- Do not open untrusted extracted files; an archive can contain malicious content even when extraction succeeds.
- Browser memory limits make very large files or archives unsuitable for local processing.
- MD5 detects accidental differences but is not secure proof of authenticity; use a modern signed hash workflow when trust matters.
Frequently asked questions
Are files uploaded?
These tools normally read selected files with browser APIs and create local downloads. The page should explicitly disclose any exception.
Why does a generated file not open?
Check the source format, encoding, chunk order, archive support and extension. Renaming a file does not convert its internal format.
Processing takes place locally in your browser.