The Exact-KB Target File Compressor resizes and compresses photos, scanned documents, and passport images to meet strict governmental and applicant portal file size ceilings (such as 50 KB, 100 KB, or 200 KB) without guesswork.

### Compression Architecture & Binary Search Engine Traditional image tools force users to slide arbitrary percentage sliders. This utility automates target-size optimization directly on an HTML5 canvas: - **Binary Search Quality Tuning**: Converts the target ceiling into exact bytes ($KB \times 1{,}024$) and evaluates JPEG compression quality factors across 7 iterative binary search steps ($[Q_{\min} + Q_{\max}] / 2$), converging on the highest quality score that remains below your target ceiling. - **Dimensional Fallback Scaling**: If the file cannot fit within the size limit at minimum JPEG quality (e.g. high-resolution scans with fine textual noise), the canvas progressively scales down physical dimensions in 15% decrements ($0.85\times, 0.70\times, \dots$) until the byte constraint is satisfied. - **Target Ceiling Presets**: Features one-click presets for standard portal thresholds (50 KB, 100 KB, 200 KB, 500 KB) alongside custom kilobyte entry.

### Practical Workflow Example Uploading a 1.8 MB photograph of a government ID to a visa portal requiring files strictly under 200 KB: 1. Drag and drop the ID image into the drop zone. 2. Click the **200 KB** target ceiling preset. 3. The browser executes binary search quality optimization on the local canvas, producing a 186 KB JPEG in under 300 milliseconds. 4. Click **Download Exact KB Image** to save the compliant file directly for submission.

### Honest Processing & Privacy Note All canvas manipulations, image re-encoding, and file generation occur locally in your browser memory. No sensitive documents, personal identification photos, or employment records are uploaded to any external server.