Detect image formats by analyzing file signatures (magic bytes). Supports JPEG, PNG, GIF, WebP, BMP, SVG, TIFF, ICO, AVIF, and more. Works with any file — rename safety check included. All client-side.
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An image format detector identifies the true file type of an image by analyzing its magic bytes — the unique file signatures at the start of every file. Unlike relying on file extensions (which can be renamed), this method reveals the actual format, helping you detect renamed, corrupted, or disguised files.
TooliFyra's free online image format detector runs entirely in your browser. Your files never leave your device. No upload, no server processing, complete privacy.
File extensions can be misleading — a file named "photo.jpg" might actually be a PNG, WebP, or even a non-image file disguised as an image. A format detector reads the actual file content to identify the true format, which is essential for security checks, file validation, and troubleshooting.
Follow these simple steps to detect image formats using TooliFyra's free online tool:
Security researchers can detect renamed files hiding behind fake extensions. Developers can verify file uploads match expected formats. Forensic analysts can identify corrupted or disguised images. Anyone can verify that a file is truly what its extension claims. Unlike command-line tools, TooliFyra offers instant image format detection with a visual interface — no installation required.
Verifying file types before processing, detecting malware disguised as images, auditing file collections for format consistency, educational demonstration of file signatures and magic bytes, and troubleshooting corrupted or unopenable image files.
TooliFyra's format detector reads true file signatures rather than trusting extensions — giving you accurate format identification with a visual hex viewer and signature reference table. The clean interface makes it easy to understand what every byte means.
Magic bytes are the first few bytes of a file that uniquely identify its format. For example, PNG files always start with 89 50 4E 47, and JPEG files start with FF D8 FF.
Yes — the tool reads the actual file content, not the extension, so it will detect the true format regardless of the file name.
JPEG, PNG, GIF, WebP, BMP, SVG, TIFF, ICO, AVIF, and more.
Yes, completely free with no usage limits.