About

BlitzTools AI Tools runs production-quality AI models directly in your browser. No cloud APIs. No file uploads. No subscriptions. Models are loaded once and execute locally using ONNX Runtime Web with WebAssembly and WebGPU backends.

This is real AI inference running on your device -- not a wrapper around a cloud API.

AI Tools

| Tool | Model | Description | Link | |------|-------|-------------|------| | Remove Background | U2-Net / RMBG-1.4 | Remove image backgrounds with AI segmentation. One-click, instant results. | Open | | Remove Object | LaMa Inpainting | Select and remove unwanted objects from photos. AI fills in the background naturally. | Open | | Face Swap | InsightFace | Swap faces between images using AI face detection and synthesis. | Open |

How It Works

Architecture

Browser
  |
  +-- Next.js Frontend (UI, file handling)
  |
  +-- ONNX Runtime Web
  |     |
  |     +-- WebGPU Backend (GPU-accelerated, if available)
  |     +-- WASM Backend (CPU fallback, always available)
  |
  +-- AI Models (downloaded once, cached in browser)
        |
        +-- U2-Net / RMBG-1.4 (background removal)
        +-- LaMa (inpainting / object removal)
        +-- InsightFace (face detection + swap)

Key Technical Details

• ONNX Runtime Web executes optimized ONNX models in the browser
• WebGPU backend provides GPU acceleration on supported browsers (Chrome 113+)
• WebAssembly SIMD backend ensures compatibility on all modern browsers
• Models are cached in the browser after first download (~20-100MB per model)
• Web Workers keep the UI responsive during inference
• Zero network calls after model download -- all processing is local

Why Browser AI?

Privacy

Your images never leave your device. Cloud AI services require you to upload your photos to their servers. BlitzTools AI Tools process everything locally. This matters for personal photos, confidential documents, and sensitive content.

No API Costs

Cloud AI APIs charge per request. BlitzTools AI Remove Background is free and unlimited. Process thousands of images without paying a cent.

No Rate Limits

No daily caps, no throttling, no queues. Process as many images as you want, as fast as your hardware allows.

Offline Capable

After the initial model download, BlitzTools AI Tools work completely offline. Models are cached in the browser's storage.

Performance

| Tool | Model Size | Inference Time (CPU) | Inference Time (WebGPU) | |------|-----------|---------------------|------------------------| | Remove Background | ~44MB | ~2-4s | ~0.3-0.8s | | Remove Object | ~100MB | ~3-6s | ~0.5-1.5s | | Face Swap | ~80MB | ~4-8s | ~1-2s |

Times measured on a mid-range laptop. Performance varies by hardware.

Use Cases

• E-commerce product photos — Remove backgrounds from product images with BlitzTools Remove Background. Process entire catalogs locally.
• Photo cleanup — Remove photobombers, power lines, or unwanted objects with BlitzTools Remove Object.
• Creative projects — Swap faces for memes, art, and creative content with BlitzTools Face Swap.
• Batch processing — Process hundreds of images without API costs or rate limits.
• Sensitive content — Process private or confidential images without uploading to third-party servers.

Tech Stack

| Component | Technology | |-----------|-----------| | AI Runtime | ONNX Runtime Web (WebGPU + WASM backends) | | Models | ONNX-optimized (U2-Net, RMBG-1.4, LaMa, InsightFace) | | Frontend | Next.js, TypeScript, Tailwind CSS | | Processing | Web Workers, Canvas API | | Model Caching | Cache API / IndexedDB | | Hosting | Docker + Caddy |

Comparison with Cloud Services

| Feature | BlitzTools AI | Cloud AI Services | |---------|--------------|-------------------| | Privacy | Files never leave device | Files uploaded to servers | | Cost | Free, unlimited | Pay per API call | | Speed | Instant (after model load) | Network latency + queue | | Rate Limits | None | Per-minute/daily caps | | Offline | Yes (after model cache) | No | | Quality | Production-grade ONNX models | Varies by provider |

Also Check Out

• BlitzTools Image Tools — Compress, resize, crop, and convert images in browser.
• BlitzTools PDF Tools — Merge, split, compress, edit PDFs in browser.
• BlitzTools Video Tools — Compress and convert videos with FFmpeg WASM.
• All BlitzTools — 66+ free browser-based tools.

License

MIT License. Copyright 2026 JSVV SOLS LLC. See LICENSE for details.