Image Edge Detection runs locally in your browser to extract contours from images, with batch processing and downloads for sketch creation, OCR preprocessing, and edge analysis workflows.
Main Features
- Upload JPG, PNG, WebP, BMP, GIF, SVG, or import whole folders in batch
- Generate black-edge-on-white results with grayscale, Gaussian smoothing, and dual-threshold edge extraction
- Compare source and result side by side, then download single or batch outputs
How to Use
- Click "Choose Images" or drag files into the upload area
- Select an item in the queue to preview
- Click "Convert Current" or "Batch Convert" to generate edge results
- Export files with "Download Current" or "Download All"
Processing Notes
- Original dimensions are preserved and only pixel colors are transformed
- Output format follows the source extension when possible, otherwise falls back to JPG
- All processing happens locally and no image is uploaded to a server
Usage Tips
- If edges look weak, increase image contrast before edge detection
- For portraits and text-heavy images, PNG input often gives cleaner boundaries
- Batch download is exported as a ZIP, and failed items are excluded automatically
FAQ
- If edges look weak, try increasing contrast before running edge detection
- SVG input is processed from the browser-rendered image content
- Batch download skips items that do not have generated results