The image grayscale converter turns images into grayscale locally in your browser. It supports batch processing and downloads, useful for ID photos, printing, desaturation for design work, and asset cleanup.
Key Features
- Upload JPG, PNG, GIF, BMP, WebP, SVG files or import a folder in batch
- Convert images to grayscale while keeping the original resolution
- Side-by-side preview with per-image download and ZIP batch export
How to Use
- Click “Choose Images” or drag files into the drop zone
- Pick an item in the list to preview
- Use “Convert Current” for one image or “Batch Convert” for all
- Download the current output or export all results as a ZIP
Notes
- Grayscale conversion changes only color channels, not dimensions
- Outputs are exported as JPG and transparent areas are filled with a white background
- When importing a folder, ZIP export tries to keep the original directory structure and adds a suffix to filenames
Grayscale Rule
Compute grayscale by 0.299R + 0.587G + 0.114B and replace all RGB channels with the same value.
For each pixel: gray = 0.299R + 0.587G + 0.114B.
FAQ
- Why export as JPG? It keeps output consistent and widely compatible, and avoids transparency differences across formats
- Is the result pure black & white? No, it is continuous grayscale (0-255 levels)
- Are images uploaded? No, everything runs locally in your browser
Privacy
All processing happens locally in your browser. Images are never uploaded to a server.