Easily check image file format online with our free Image File Format Checker. Instantly detect photo type, extension, MIME, resolution, and signature — all processed securely in your browser. Perfect for verifying JPEG, PNG, GIF, BMP, TIFF, and WebP files with complete privacy.
Image File Format Checker
Upload an image to detect its extension, MIME type, magic bytes (signature), dimensions, and likely format — all locally in your browser.
You can check any file format here: File Format Checker
How to Check Image File Format Online
Using the Image File Format Checker is simple, quick, and secure. Follow these easy steps:
- Upload or drag & drop your image file into the tool.
- Click “Check Format” to analyze your image instantly.
- View key details such as:
- File name and size
- File extension and MIME type
- File signature (magic number)
- Image resolution (width × height)
- Compression and color type (if available)
Tip: The tool checks both the visible extension and the hidden binary signature, allowing you to detect mismatched or mislabeled files (for example, an image renamed as .jpg but actually a .png).
How to Check Photo Format on iPhone
If you need full details (MIME type, resolution, or binary signature), open Safari or Chrome on your iPhone, visit the Image File Format Checker, and upload your photo. It instantly displays the image’s exact format and metadata.
How to Know If a Photo is JPEG on iPhone
Using the Online Checker:
- Upload your photo to the Image File Format Checker in Safari.
- It will instantly display the true file format (JPEG, HEIC, PNG, etc.), even if the extension is renamed.
This method helps when sharing images across platforms that don’t support HEIC (Apple’s default format).
Why Checking Your Image File Format Matters
Knowing your image’s true format offers several key benefits:
- Ensure Compatibility: Prevent upload issues on websites or apps that only accept specific formats.
- Maintain Quality: Use the best format for editing or printing to preserve image clarity.
- Optimize for Web: Choose compressed formats like WebP or JPEG to speed up page loading.
- Detect Mislabeling: Confirm the actual file type behind renamed extensions.
- Save Storage: Identify formats that take up less space without losing visual quality.
Understanding your image file format ensures better performance, consistency, and quality across devices and platforms.
Conclusion
Our Image File Format Checker is a fast, secure, and user-friendly solution for identifying any photo or image type. It helps you instantly discover your file’s extension, MIME type, signature, and resolution without installing any software.
Whether you’re verifying compatibility, troubleshooting upload issues, or checking for misnamed files, this tool provides instant results with full privacy protection.