---
title: OCR Math Captcha
emoji: 🔢
colorFrom: indigo
colorTo: blue
sdk: static
app_file: index.html
short_description: In-browser math captcha OCR, no server
models:
  - arkhabbazan/ocr-math-captcha
---

# OCR Math Captcha

In-browser demo of [`arkhabbazan/ocr-math-captcha`](https://huggingface.co/arkhabbazan/ocr-math-captcha), a TrOCR
fine-tune that reads short arithmetic captchas such as `26+7=?` and then
evaluates the expression it read.

Inference runs client-side through
[transformers.js](https://github.com/huggingface/transformers.js) on ONNX
weights — there is no backend, and images never leave the browser. Weights are
downloaded once and cached by the browser.

**Limitations.** Training data was primarily synthetic, so unseen fonts and
layouts degrade accuracy. Built for short single-line expressions at 130x30,
not document OCR. Use only on images you are authorized to process.