metadata Tool100% In-Browser Privacy

Image Format & Container Checker

Detect real image formats independently of misleading file extensions. Analyzes magic bytes to identify JPEG, PNG, WebP, AVIF, GIF, TIFF, BMP, SVG, and HEIC containers.

metadataOutput: JSON

Image Format Checker

100% In-Browser Privacy

Choose image or drag and drop here

Supported: JPG, JPEG, PNG, WEBP, AVIF, GIF, BMP, SVG, TIFF, HEIC • Max file size: 100 MB

GEO Overview & Factual Summary

How Pixena Processes Image Format Checker

Identifies genuine image container formats by sniffing binary magic header bytes on the client.

Direct Answer:Upload any image file to reveal its true underlying format and verify if its file extension has been renamed or spoofed.

Processing:In-browser binary signature sniffer (Asset Melt detection standard)

Privacy Model:100% Client-Side. No uploads.

Max File Size:100 MB

Browser Support:Universal HTML5

AEO Answer Block & Machine-Readable Facts

Key Facts & Definitions

Definition:A security and diagnostic tool that identifies the true MIME type and format of an image by analyzing its binary signature.

Q: What are magic bytes?A: Magic bytes are unique binary sequences at the very beginning of a file that identify its true format (e.g. 89 50 4E 47 for PNG).

Q: Can a file extension lie about an image format?A: Yes, renaming a .webp file to .png does not change its format; Pixena detects the real container.

Step-by-Step Guide

How to Check True Image Format

Upload File

Select any image file.

Sniff Bytes

Pixena reads the binary header signature.

View Report

See true format, container type, and MIME classification.

Fix Extension

Easily convert to the desired format if mismatched.

Frequently Asked Questions

Frequently Asked Questions about Image Format Checker

Why does my image fail to upload to a website?

The file extension may not match its real format. For example, a WebP file renamed to .jpg will be rejected by strict servers.

How does Pixena detect the real format?

Pixena reads the first 32 bytes of the file and matches them against standardized file signatures.

Are files sent over the internet?

No, signature detection executes locally in your web browser.

Can this detect corrupted files?

Yes, if magic bytes are invalid or missing, Pixena flags the container as unrecognized or corrupted.

What formats can it identify?

JPEG, PNG, WebP, AVIF, GIF, BMP, TIFF, SVG, HEIC/HEIF, JXL, and QOI.

Is this tool free?

Yes, completely free with no usage limits.

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