Question 1

How accurate is the tampering detector?

Accepted Answer

The detector combines five complementary forensic techniques (ELA, entropy, LSB, clone detection, metadata) for a comprehensive assessment. The composite scoring provides a useful screening indicator, but sophisticated or intentionally anti-forensic tampering may evade detection. Results should be considered forensic indicators, not definitive proof.

Question 2

What types of tampering can this tool detect?

Accepted Answer

The tool detects five categories: JPEG compression inconsistencies from localized editing (via ELA), synthetic or noise-based content (via entropy), LSB steganographic data hiding (via LSB distribution analysis), copy-move forgery and object cloning (via block matching), and metadata/EXIF anomalies (missing EXIF, multiple EXIF segments, inconsistent metadata).

Question 3

What file formats are supported?

Accepted Answer

JPEG, PNG, WebP, GIF, BMP, and TIFF. JPEG files receive the most comprehensive analysis because ELA requires JPEG compression for meaningful results. PNG and lossless formats still receive entropy, LSB, clone detection, and metadata analysis.

Question 4

What is Error Level Analysis (ELA)?

Accepted Answer

ELA is a forensic technique that detects regions with different compression levels. It resaves the image at a known JPEG quality (90%) and measures pixel differences. Edited areas show larger differences, revealing compositing or retouching.

Question 5

Can the tool analyze screenshots?

Accepted Answer

Yes, but results differ from camera photos. Screenshots lack JPEG compression artifacts, making ELA less informative. The tool still provides entropy, LSB, clone detection, and metadata analysis.

Question 6

What causes false positives in clone detection?

Accepted Answer

Natural repeating patterns like brick walls, grass textures, water ripples, and uniform color areas can produce false positives in copy-move detection. The tool accounts for this by comparing the proportion of duplicate blocks.

Question 7

Can this tool detect deepfake images?

Accepted Answer

The tool can detect some indicators common in deepfake generation (entropy anomalies, ELA inconsistencies) but is not specifically designed for deepfake detection. AI-generated images often require specialized techniques.

Question 8

Is my image data safe?

Accepted Answer

Yes. All analysis runs entirely in your browser using JavaScript and the Canvas API. Images are never uploaded to any server. No data leaves your device.

Question 9

Is this tool free to use?

Accepted Answer

Yes - 100% free with no signup, no account, and no usage limits. All forensic analysis features are available without restrictions.

Image Tampering Detector