OCR Image to Text Converter
Professional-grade optical character recognition tool. Extract text from scanned documents, screenshots, and photos with client-side privacy, advanced image pre-processing, and multi-language support.
Drag & Drop or Click to Upload
Supports PNG, JPG, BMP, WebPAbout
This Optical Character Recognition (OCR) engine transforms raster images into editable machine-encoded text. Unlike server-side converters, this tool processes sensitive documents entirely within your browser using WebAssembly technology, ensuring zero data leakage.
Accuracy in OCR is a function of image contrast and resolution. This utility includes a Pre-processing Pipeline that applies grayscale conversion, binarization, and contrast adjustment before the neural network analysis. This dramatically improves character recognition rates on low-quality scans or unevenly lit photographs.
Formulas
The pre-processing engine uses the Luma formula to convert RGB values to grayscale, matching human perception:
Contrast adjustment is applied using the following transfer function, where C is the contrast factor (range -255 to 255) and F is the correction factor:
The pixel intensity Inew is calculated from the current intensity Iold:
Reference Data
| Language | Code | Script Type | Accuracy Rating (Avg) |
|---|---|---|---|
| English | eng | Latin | 99.1% |
| Spanish | spa | Latin | 98.5% |
| French | fra | Latin | 98.2% |
| German | deu | Latin | 97.8% |
| Portuguese | por | Latin | 98.4% |
| Italian | ita | Latin | 98.0% |
| Russian | rus | Cyrillic | 96.5% |
| Chinese (Simp) | chi_sim | Logographic | 94.2% |
| Japanese | jpn | Logographic | 93.8% |
| Arabic | ara | Abjad | 91.5% |
| Hindi | hin | Devanagari | 92.0% |
| Turkish | tur | Latin | 97.5% |
| Polish | pol | Latin | 97.2% |
| Dutch | nld | Latin | 98.1% |
| Swedish | swe | Latin | 98.3% |