FileIDex · Cyber Triage

Identify the real shape of a file before it bites.

Upload a sample and we will compare extension, MIME, and magic bytes. Optionally include an OpenAI risk readout for text-like files.

Magic bytes MIME GPT-5.5 commentary
Max size 15 MB
Uploads are not retained

The upload limit includes the file and form data.

For requested commentary, your key and the text preview are sent through this server to OpenAI. Usage is billed to your OpenAI account.

The app keeps your key in this open page only. It is cleared when you leave the page and is not saved for future visits.

Waiting for a file…
Identity Check
Filename
—
Extension
—
Size
—
Guessed MIME
—
Magic MIME
—
Magic Description
—
SHA-256
—
MD5
—
Flags
—

SHA-256 and MD5 cover the entire uploaded file.

Snippet Preview

Text previews sample up to the first 8,192 file bytes.

Upload a text-like file to see a preview.
Hex Preview

Offsets, hexadecimal bytes, and printable ASCII.

Upload a file to see its first bytes.
OpenAI Security Commentary · GPT-5.5
Waiting…

AI commentary requires a non-empty text preview.

Optional commentary sends the text preview to OpenAI.

Analyze a text-like file first. You can then run or retry commentary with your current API key without uploading again.