FastImageToolsFastImageTools

Inspect Image Format, Structure, and Compatibility

See exactly what format your image uses and where it may break.

Free - no watermarksBatch inspection + JSON report

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

Popular ways to use this tool

Image Extension Mismatch Checker

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

JPG Format Inspector

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

Progressive JPEG Checker

Check whether a JPEG uses progressive scans or baseline encoding.

PNG Format Inspector

Inspect PNG color type, bit depth, transparency, interlace, profile, text, and APNG information.

PNG Transparency Checker

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

GIF Frame Counter

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

Animated Image Checker

Check whether a supported GIF, WebP, PNG, AVIF, or HEIC file contains animation information.

Image Bit Depth Checker

Read the encoded bit depth reported by supported raster image structures.

Inspection runs locally in your browser. This feature does not upload files or use a server fallback. Inspect JPG, PNG, WebP, AVIF, GIF, SVG, HEIC, TIFF, BMP, and selected RAW files. Batch size follows your tool limit.

Why Use FastImageTools for Format Inspection

Local-first processing

Most inspections run directly in your browser for fast, private analysis.

Instant technical breakdown

Get format, container, metadata, color, and compatibility details in seconds.

Available without a watermark

Inspect files locally; batch size follows the limit for your account or execution tier.

Actionable recommendations

See parser-supported warnings and suggested next tools; recommendations are not repairs or guarantees.

How to Inspect an Image Format

  1. 1

    Upload image files

    Upload JPG, PNG, WebP, AVIF, GIF, SVG, HEIC, or TIFF files to inspect.

  2. 2

    Choose what to review

    Review format details, metadata, compatibility, and integrity warnings per file.

  3. 3

    Download or act on results

    Copy or download a JSON inspection report, or open a suggested converter or optimizer.

Browser-Based Inspection vs Cloud Services

FastImageTools (local-first)

  • Inspection runs in your browser without uploading files
  • No upload wait for typical files
  • Batch size follows your account or execution-tier limit
  • Free for everyday technical inspections
  • Core checks can work with unstable internet

Typical cloud tools

  • —Files are often uploaded before analysis begins
  • —Upload time adds delay on large batches
  • —Limits can apply by file size or queue
  • —Advanced analysis often requires paid plans
  • —Usually unavailable without active connection

Example Inspection Result

Inspected file

Reported file size

product-hero.avif

-Not calculatedAVIF → suggested WebP

Suggested next format

Not calculated

Not evaluated

Supported Formats

JPG

Great compatibility, ideal for photos and social media uploads.

PNG

Lossless quality and transparency, common for UI assets and graphics.

WebP

Modern web format with strong compression and optional transparency.

AVIF

Very efficient next-gen format with excellent compression for web delivery.

GIF

Legacy animated format with broad support but larger file sizes.

SVG

Vector format for icons, logos, and resolution-independent illustrations.

Format Inspector FAQ

Does format inspection reduce image quality?+
No. Inspection reads file structure and metadata only, without altering pixels.
Is it safe to inspect sensitive images here?+
Yes. This feature inspects files locally in your browser and does not use a server fallback.
What is the maximum file size for inspection?+
Batch and file limits depend on your tool tier. Files over 50 MB may skip browser-based fallback dimension decoding.
Can I inspect multiple images at once?+
Yes. Upload a batch to compare formats, issues, and recommendations side by side.
Can this detect lossy vs lossless encoding?+
The inspector reports compression or encoding details when the format parser can determine them.
Will it tell me the best format for web?+
It provides suggestions based on parsed traits and a built-in compatibility table, not a definitive best-format verdict.
What is the difference between local and cloud analysis?+
This inspector runs locally in your browser; there is no cloud analysis or automatic server fallback.
Are images uploaded to your servers?+
No. Files inspected by this feature stay in your browser and are not uploaded to our servers.

Related Tools

Fix issues found during inspection with these next-step tools.

Convert to WebP

Create smaller web-ready files with broad modern support.

Convert to AVIF

Maximize compression for performance-focused web pages.

Convert to PNG

Generate lossless files for graphics and transparency use cases.

Convert to JPG

Create universally compatible image files for every platform.

Metadata Cleaner

Review or remove supported embedded metadata before publishing or sharing.

Image Optimizer for Web

Automatically tune quality and size for fast page loads.

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