FastImageToolsFastImageTools

JPG Format Inspector

Inspect JPEG container and encoding details without decoding or changing the picture. The inspection runs locally in your browser, and the original file is not uploaded by this tool.

Local processingJSON reportNo sign-up

Drag & drop your images

or click below to browse your files

JPGPNGWebPAVIFGIFSVGHEICTIFFBMPRAW
⌘VPaste from clipboard
•Drag from Finder or Photos

Free users: up to 15 images at once • Premium: unlimited batch processing

Back to Inspect Image Format, Metadata, and Compatibility

What this inspection checks

Inspect JPEG container and encoding details without decoding or changing the picture.

For a readable JPEG, the report can show baseline or progressive mode, dimensions, bit depth, chroma subsampling, scan count, quantization-based quality estimate, and the presence of EXIF, IPTC, XMP, or ICC markers.

How to inspect the image

  1. 1

    Choose an image

    Select one or several supported image files from your device.

  2. 2

    Review the detected fields

    Open the format details and integrity tabs to review the values found in the file structure.

  3. 3

    Keep the result

    Copy the report or download it as JSON. The original image is not changed.

Frequently asked questions

What does this checker report?

For a readable JPEG, the report can show baseline or progressive mode, dimensions, bit depth, chroma subsampling, scan count, quantization-based quality estimate, and the presence of EXIF, IPTC, XMP, or ICC markers.

Is my image uploaded?

No. This inspection runs in your browser and does not upload the original image.

Does the checker modify the image?

No. It reads technical fields and produces a report; it does not convert, repair, or rewrite the file.

Is the result a complete file validation?

The quality value is an estimate, not the original encoder setting. Metadata markers are detected, but this page does not expose every metadata value.

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Image Extension Mismatch Checker

Compare a known filename extension with the image format detected from the file signature.

PNG Transparency Checker

Check whether a PNG encodes transparency through an alpha channel or a tRNS chunk.

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Count frames in a GIF and inspect its animation timing, loop setting, palette, and transparency.

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