Image Redaction Tool
Image Redaction Tool
Offline image redaction with blur, mosaic, and solid masks. Mark with rectangles/brush and batch export (ZIP).
Drag and drop images here or click to browse
Supports PNG / JPEG / WebP / AVIF / HEIC / HEIF
Image Redaction Tool
🚀 Quick Start
- Drag or click to add images (multi-select supported)
- Mark sensitive areas with rectangle or brush
- Choose effect (mosaic/blur/solid) and adjust intensity
- Real-time preview with undo/redo
- Export and download; multiple images auto-packaged as ZIP
📌 Common Scenarios
- ID cards: redact ID numbers, addresses
- Chat screenshots: hide avatars, nicknames, sensitive messages
- Bills/receipts: redact order numbers, amounts, addresses
- Batch processing: apply same regions to same-size images
🎛️ Redaction Tools & Options
- Four tools: Select (move/resize), Rectangle, Brush, Eraser
- Select a region first to adjust effect; unselected sets default for new regions
- Auto-sync when all images are same size; auto-disabled otherwise
- Output format: PNG (lossless) / JPEG (compact) / WebP (balanced)
🧭 Usage Advice
- Shortcuts: Ctrl/⌘+Z undo, Ctrl/⌘+Y redo, Del delete
- Scroll to zoom, right-click drag to pan (macOS: Ctrl+click)
- Use solid blocks for maximum privacy
- Mosaic/blur may theoretically be reversed by AI
- Process large images or batches in smaller groups
⚠️ Limitations & Compatibility
- Very large images may fail to export; resize first
- JPEG doesn't support transparency; fills with white
- HEIC/AVIF decoding depends on browser support
- Undo history limited to 50 steps per image
🔒 Privacy & Security
- All processing happens in your browser; data never leaves your device
❓ FAQ
Why is "Apply to all images" unavailable?
All images must have identical dimensions. Ensure same width and height.
Why doesn't the eraser work?
Eraser only removes brush strokes, not rectangle regions.
Can mosaic/blur be reversed?
Theoretically possible with AI. Use solid blocks for higher security.
Why is there no quality option for PNG?
PNG is lossless; JPEG/WebP use lossy compression with adjustable quality.