Detect File Type Online
Identify a file’s real format using magic-byte (signature) matching. This tool detects the most likely file type, extensions, and MIME type from the file header—useful for forensics, debugging uploads, and verifying suspicious or renamed files.
File
Drag & drop a file here
or click to choose a file from your device
Upload
Categories
Tip: click to include/exclude categories.
Scan Mode
Deep scan searches inside the file (slower). Use speed controls below to tune performance.
Output
No matches yet. Upload a file and click Detect.
How to use the File Type Identifier
- Upload a file (drag & drop or click the uploader).
- Select which categories to scan (Images, Documents, Archives, etc.).
- Optional: enable Deep Scan to find embedded signatures.
- Click Detect to see the detected type, extensions, and MIME.
Common use cases
- Verify files that have the wrong or missing extension.
- Check MIME type before uploading to a website or API.
- Inspect suspicious downloads in basic forensic workflows.
- Detect embedded content inside archives or container formats (Deep Scan).
FAQ
Does this work if a file is renamed?
Yes. Detection is based on the file header/signature, not the filename.
What is a “magic number”?
It’s a known byte pattern near the start of many file formats that identifies the format.
Should I use Deep Scan?
Use Deep Scan when you suspect embedded files or want forensic-style inspection. It takes longer and uses more scanning.