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Upload any file and instantly detect its real file type, extension, MIME type, and basic file details
Detects real type using magic bytes — extension doesn't matter
Up to 20 MB MB per file • 20 files at once
Upload any file and instantly verify its real format, MIME type, extension match, size, and magic bytes directly in your browser.
Drag and drop one or multiple files into the upload area, or click Browse Files to select them manually.
The checker reads the first bytes of the file to detect the real file type instead of trusting only the extension.
See the real type, MIME type, file size, category, extension match status, and magic byte signature.
Copy single file details or export all checked files as CSV for reports, audits, or quick sharing.
Real type found: PDF Document
Check real file format, detect renamed files, inspect MIME type, and export results with a clean browser-based experience.
Detect the actual file type by reading magic bytes, even if the file extension has been changed manually.
Instantly know when a file name says one thing but the real file format is different.
View the first bytes of the file signature for deeper technical inspection.
Upload and analyse multiple files at once without repeating the same process again and again.
Your files are checked inside the browser, making the experience fast, simple, and privacy-friendly.
Download all file type results as a CSV file for audits, reports, or documentation.
For unsupported files, still get useful details like size, extension, entropy, and raw header bytes.
A file extension can be renamed easily, but the actual file format is stored inside the file data. This Check File Type tool reads the file signature, also called magic bytes, to identify the real format more accurately.
It is useful when you want to verify downloaded files, detect wrong extensions, inspect unknown files, or confirm MIME type before uploading files to a website, server, or application.
A file named image.jpg may actually be a PDF, ZIP, script, or another format.
Check suspicious files before opening or uploading them somewhere important.
Quickly verify MIME type, extension mismatch, and file headers during testing.
These examples show how the tool detects real formats, wrong extensions, and unknown file signatures.
Uploaded file name
Uploaded file name
Uploaded file name
Learn how real file detection, magic bytes, MIME type, and privacy work in this tool.
This checker helps you identify renamed, unknown, or suspicious files before using them.
A file type checker detects the real format of a file by reading its internal signature instead of only trusting the extension.
Yes. If a file is renamed from PDF to JPG or ZIP to TXT, this tool can still detect the real type using magic bytes.
Yes. If a file is renamed from PDF to JPG or ZIP to TXT, this tool can still detect the real type using magic bytes.
Magic bytes are special starting bytes inside a file. They help identify formats like PNG, PDF, ZIP, GIF, WEBP, and more.
If the format is unknown, the tool still shows useful details like file size, extension, MIME fallback, entropy, and header bytes.
Send this output image directly to another tool without re-uploading.