| Key features | - Image Compressor: shrink JPG, PNG and WebP files by quality or exact target size
- Image Resizer: set exact dimensions, scale by percentage or fit inside a bounding box
- Image Cropper: crop freely or to fixed ratio, rotate, straighten, flip
- Image Converter: convert between JPG, PNG, WebP and AVIF with quality control
- Batch Image Tools: apply resize, compression, conversion and watermarks across dozens of images
- QR Code Generator: create QR codes for links, Wi-Fi, contacts, payments with custom colours and logos
- Barcode Generator: generate EAN-13, UPC-A, Code 128, Code 39, ITF-14 with validation
- OCR Text Extractor: pull text from screenshots, scans and photos in 60+ languages
- Passport Photo Maker: produce photos at exact millimetre size and DPI on printable paper
- Image to PDF: combine images into a single PDF with page size and margin control
| - Four grayscale conversion methods: Weighted, Average, Maximum, Minimum
- Adjustable brightness and contrast controls from -100 to +100
- Real-time preview of adjustments
- Support for JPG, PNG, and WebP formats
- Browser-based processing with no server upload
- Download as PNG to preserve transparency
- No watermarks or signup required
- Weighted method uses ITU-R BT.709 industry standard luminance
- Multiple related tools: Monochrome, Desaturate, Sepia, Vintage, and effects
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| What makes it different | - All processing happens locally in your browser with no file uploads to any server
- No account, signup, login or email collection required
- Multiple operations combined in one pass without quality loss
- Real controls for exact specifications like file size, dimensions and print resolution
| - Four different grayscale algorithms to choose the right output for your photo
- Privacy-first approach with all processing in browser and no image uploads
- Practical focus on specific workflows rather than generic one-click effects
- Educational guides explaining technical concepts and when to use each method
- Instant results without upload or download wait times
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ImageDoctor
Grayscale Image