4 browser-based tools

Files

Inspect filenames, checksums, MIME types, and file sizes without uploading files.

Explore files tools

Choose a tool for an immediate answer. Inputs stay on this device unless the page clearly says otherwise.

Files

File Size Converter

Convert file sizes across byte, KB, MB, GB, and TB units.

Files

File Hash Calculator

Calculate a local file’s SHA-256 checksum without uploading it.

Files

Filename Cleaner

Turn a filename into a safe, tidy, portable name before renaming it.

Files

MIME Type & Extension Lookup

Look up common MIME types by extension, or extensions by MIME type.

Designed for quick, reliable answers

These tools put the useful part first. Each page explains the calculation or transformation it performs, includes practical examples, and links to closely related utilities.

No account is required, and these utilities work entirely in your browser.