File Signature Viewer
Upload any file to view it as-is — everything is processed on your device, never sent anywhere.
Drag & drop a file, or click to choose
The file is processed in your browser and never uploaded to a server.
Example
Example Input
photo.txt (actually JPEG)
Example Output
magic bytes + detected type
How to Use
- 1Drag & drop any file onto the upload area, or click to choose a file.
- 2Click Open.
- 3See the file rendered along with its metadata. Everything is processed on your device — the file is never uploaded.
About File Signature Viewer
File Signature Viewer shows the "magic bytes" (signature) at the start of a file and matches them to a known type (JPEG, PNG, PDF, ZIP, GZIP, etc.). It also warns when the extension doesn't match the signature.
Useful for identifying unknown files or spotting a misleading extension. Read in the browser, no upload.
FAQ
Is my file/data uploaded to a server?
No. Everything is opened and rendered in your browser with JavaScript (the File API). Nothing is uploaded, logged, or stored on our servers — safe for sensitive files.
How is this viewer different from an extractor or parser?
A viewer shows the content as-is (read-only) — you see the file/text the way it is. An extractor pulls raw data (e.g. text from a PDF) into a string, while a parser breaks input into its component structure. A viewer focuses on "see", not "transform" or "pull".