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Check File Type

Upload any file and instantly detect its real file type, extension, MIME type, and basic file details

Analysing files…
Reading magic bytes

Drop any files here

Detects real type using magic bytes — extension doesn't matter
Up to 20 MB MB per file • 20 files at once

Browse Files
Detects: Images Video Audio PDF Office Archives Code Fonts Unknown
Drop more files or
Results — 0 files
File Name Real Type Size Ext Match MIME Category
Showing 0 files
Quick Guide

How to Use Check File Type

Upload any file and instantly verify its real format, MIME type, extension match, size, and magic bytes directly in your browser.

01

Upload your file

Drag and drop one or multiple files into the upload area, or click Browse Files to select them manually.

02

Let the tool scan it

The checker reads the first bytes of the file to detect the real file type instead of trusting only the extension.

03

Review the result

See the real type, MIME type, file size, category, extension match status, and magic byte signature.

04

Copy or export

Copy single file details or export all checked files as CSV for reports, audits, or quick sharing.

Example Result File signature verified

document.jpg

Real type found: PDF Document

Extension Mismatch
MIME Type application/pdf
Magic Bytes (First 16 bytes) 25 50 44 46
Files are checked locally in your browser.
Powerful Features

Everything You Need to Identify Files Safely

Check real file format, detect renamed files, inspect MIME type, and export results with a clean browser-based experience.

Real File Type Detection

Detect the actual file type by reading magic bytes, even if the file extension has been changed manually.

Extension Mismatch Alert

Instantly know when a file name says one thing but the real file format is different.

Magic Bytes Preview

View the first bytes of the file signature for deeper technical inspection.

Batch File Checking

Upload and analyse multiple files at once without repeating the same process again and again.

Private Browser Scan

Your files are checked inside the browser, making the experience fast, simple, and privacy-friendly.

Export CSV

Download all file type results as a CSV file for audits, reports, or documentation.

Unknown File Details

For unsupported files, still get useful details like size, extension, entropy, and raw header bytes.

File Type Checker

Check the Real File Type, Not Just the Extension

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.

Detect renamed or disguised files
View MIME type and file category
Inspect magic bytes and file details

Why real type matters?

A file named image.jpg may actually be a PDF, ZIP, script, or another format.

Better file safety

Check suspicious files before opening or uploading them somewhere important.

Useful for developers

Quickly verify MIME type, extension mismatch, and file headers during testing.

Examples

See How File Type Checking Works

These examples show how the tool detects real formats, wrong extensions, and unknown file signatures.

invoice.jpg

Uploaded file name

Mismatch
Real Type PDF Document
MIME Type application/pdf
Magic Bytes (First 16 bytes) 25 50 44 46

photo.png

Uploaded file name

Matched
Real Type PNG Image
MIME Type image/png
Magic Bytes (First 16 bytes) 89 50 4E 47

backup.txt

Uploaded file name

Renamed
Real Type ZIP Archive
MIME Type application/zip
Magic Bytes (First 16 bytes) 50 4B 03 04
FAQs

Questions About File Type Checking

Learn how real file detection, magic bytes, MIME type, and privacy work in this tool.

Need quick clarity?

This checker helps you identify renamed, unknown, or suspicious files before using them.

Browser based Fast scan Magic Bytes (First 16 bytes)

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.

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