.png Validation
Image validation that sees what humans see
A single-pixel transparent PNG passes every standard file upload check. Uplint analyzes the actual image content to ensure your users are uploading real images, not placeholders.
Common PNG Image Upload Issues
Single-pixel or 1x1 transparent images used as placeholders
Solid-color images (all white, all black) with no actual content
Corrupt PNG files that fail to render in browsers
Executables with PNG headers (polyglot files)
Oversized images that waste storage and bandwidth
What Uplint Validates
MIME type verification via magic bytes
Image dimension analysis (minimum size thresholds)
Single-color / solid-color detection
PNG chunk structure validation
Malware scanning
Context-based size and dimension rules
Quick Start
validate-png.ts
const result = await uplint.validate(file, {
context: "profile-photos",
scan: true,
detectBlanks: true
});Start validating PNG Image files today
Try the free CLI first: pip install uplint