🔍 Format Detector

Image Format Detector

Instantly reveal image format, dimensions, file size, bit depth, aspect ratio, raw magic bytes and EXIF-style metadata. 100% private — no upload.

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Drop any image to inspect

Supports JPG, PNG, WEBP, GIF, BMP, TIFF, ICO, SVG and more

Preview
JPG
Detected via magic bytes & MIME type
filename.jpg
File Information
File Signature (Magic Bytes)
Image Analysis
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Deep Image Inspection

Everything about your image file in one glance

🧬

Magic Byte Detection

Format is identified from the actual binary file signature — not just the file extension, which can be spoofed.

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Full Dimensions

Pixel width, height, aspect ratio, megapixel count and print size at 72/96/300 DPI all calculated automatically.

🎨

Color Analysis

Detect color mode (RGB, RGBA, grayscale), estimated bit depth, transparency support and animation frames.

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Smart Recommendations

Get actionable advice on whether to convert, compress or resize your image based on its detected properties.

Frequently Asked Questions

What are "magic bytes"?
Magic bytes (also called a file signature) are the first few bytes of a file that identify its format regardless of the filename or extension. For example, every valid JPEG starts with the bytes FF D8 FF, and every PNG starts with 89 50 4E 47. This tool reads these bytes directly so it can identify the true format even if a file has been incorrectly named.
Can this tool detect if an image has been tampered with?
Partially. If an image has a mismatched extension (e.g. a PNG renamed to .jpg), this tool will detect the real format. It can also detect unusual file sizes that might suggest hidden data (steganography). However, it is not a dedicated forensics tool and cannot detect all forms of image manipulation.
Is EXIF data extracted?
This tool extracts metadata available through the browser's File API and canvas analysis — file size, dimensions, color mode and type. Full EXIF extraction (GPS coordinates, camera model, shutter speed) requires parsing binary JPEG APP1 segments, which this tool approximates for common JPEG files.
Does my image get uploaded?
No. All analysis is done locally using the JavaScript FileReader API and HTML5 Canvas. Your image never leaves your browser tab.