File Utilities
Inspect, verify, organise
Read file metadata, analyse sizes, compute checksums, verify real file types from their signature, find duplicates and batch-rename in bulk.
These answer questions about a file rather than changing it: what is it really, what is inside it, is it identical to that other one, and why is it so large.
All of it works from the bytes themselves, read in your browser. That is the only way to get a truthful answer — a file extension is chosen by whoever sent the file, and it is wrong often enough to matter.
7 tools · all client-side
Which one do I need?
- Is this file what it claims to be?
File Signature Checker - Why will this not fit an upload limit?
File Size Analyzer - Are these two files the same?
File Hash Generator - Which of these are duplicates?
Duplicate File Detector - What does this file say about me?
File Metadata Viewer - Rename a folder full of files properly
Batch File Rename
Worth knowing
Hashing is the tool worth understanding here, because it answers a question nothing else answers exactly. Two files with the same digest are byte-for-byte identical whatever they are named; different digests mean genuinely different content. It also verifies a download against a published checksum, which is worth doing for installers regardless of whether you are hunting duplicates.