NullID public guide
Metadata privacy before sharing files
The Metadata Inspector helps you review what a local file exposes before you share it. It supports browser image inspection and cleaning, PDF metadata cleanup, archive inspection, and format-specific warnings.
Supported browser image work
NullID reads JPEG/TIFF EXIF and image metadata hints for common formats including PNG, WebP, GIF, AVIF, BMP, and TIFF where the browser can decode them. Clean image exports are created through browser image re-encoding with configurable output format, quality, and resizing.
Document and archive review
Advanced metadata analysis can inspect PDF and ZIP-family archive signals. Browser PDF metadata cleanup targets visible PDF metadata fields. Office and more complex media cleanup remain format-dependent and may require external offline tooling.
How to use it
- Open Metadata Inspector.
- Drop an image or file for local analysis.
- Review parsed fields, risk level, format diagnostics, and before SHA-256.
- Generate a cleaned output when the format supports it.
- Compare after SHA-256 and download the cleaned file.
Limitations
- Metadata cleaning is best-effort and format-dependent.
- HEIC/HEIF is usually blocked by browser decode pipelines and is reported with remediation guidance.
- Canvas re-encoding can change compression, flatten animation, or affect transparency depending on format.
- Review outputs before sharing; NullID does not certify that every metadata field was removed.