tesseract.js/examples/browser/demo.html

<script src="/dist/tesseract.dev.js"></script>
<script>

function progressUpdate(packet){
	var log = document.getElementById('log');

	if(log.firstChild && log.firstChild.status === packet.status){
		if('progress' in packet){
			var progress = log.firstChild.querySelector('progress')
			progress.value = packet.progress
		}
	}else{
		var line = document.createElement('div');
		line.status = packet.status;
		var status = document.createElement('div')
		status.className = 'status'
		status.appendChild(document.createTextNode(packet.status))
		line.appendChild(status)

		if('progress' in packet){
			var progress = document.createElement('progress')
			progress.value = packet.progress
			progress.max = 1
			line.appendChild(progress)
		}


		if(packet.status == 'done'){
			var pre = document.createElement('pre')
			pre.appendChild(document.createTextNode(packet.data.data.text))
			line.innerHTML = ''
			line.appendChild(pre)

		}

		log.insertBefore(line, log.firstChild)
	}
}

async function recognizeFile(file) {
	document.querySelector("#log").innerHTML = ''
  const corePath = '../../node_modules/tesseract.js-core/tesseract-core.wasm.js';

  const lang = document.querySelector('#langsel').value
  const data = await Tesseract.recognize(file, lang, {
    corePath,
    logger: progressUpdate,
  });
  progressUpdate({ status: 'done', data });
}
</script>
<select id="langsel" onchange="window.lastFile && recognizeFile(window.lastFile)">
<option value='afr'     > Afrikaans             </option>
<option value='ara'     > Arabic                </option>
<option value='aze'     > Azerbaijani           </option>
<option value='bel'     > Belarusian            </option>
<option value='ben'     > Bengali               </option>
<option value='bul'     > Bulgarian             </option>
<option value='cat'     > Catalan               </option>
<option value='ces'     > Czech                 </option>
<option value='chi_sim' > Chinese               </option>
<option value='chi_tra' > Traditional Chinese   </option>
<option value='chr'     > Cherokee              </option>
<option value='dan'     > Danish                </option>
<option value='deu'     > German                </option>
<option value='ell'     > Greek                 </option>
<option value='eng'     selected> English                </option>
<option value='enm'     > English (Old)         </option>
<option value='meme'     > Internet Meme                </option>
<option value='epo'     > Esperanto             </option>
<option value='epo_alt' > Esperanto alternative </option>
<option value='est'     > Estonian              </option>
<option value='eus'     > Basque                </option>
<option value='fin'     > Finnish               </option>
<option value='fra'     > French                </option>
<option value='frk'     > Frankish              </option>
<option value='frm'     > French (Old)          </option>
<option value='glg'     > Galician              </option>
<option value='grc'     > Ancient Greek         </option>
<option value='heb'     > Hebrew                </option>
<option value='hin'     > Hindi                 </option>
<option value='hrv'     > Croatian              </option>
<option value='hun'     > Hungarian             </option>
<option value='ind'     > Indonesian            </option>
<option value='isl'     > Icelandic             </option>
<option value='ita'     > Italian               </option>
<option value='ita_old' > Italian (Old)         </option>
<option value='jpn'     > Japanese              </option>
<option value='kan'     > Kannada               </option>
<option value='kor'     > Korean                </option>
<option value='lav'     > Latvian               </option>
<option value='lit'     > Lithuanian            </option>
<option value='mal'     > Malayalam             </option>
<option value='mkd'     > Macedonian            </option>
<option value='mlt'     > Maltese               </option>
<option value='msa'     > Malay                 </option>
<option value='nld'     > Dutch                 </option>
<option value='nor'     > Norwegian             </option>
<option value='pol'     > Polish                </option>
<option value='por'     > Portuguese            </option>
<option value='ron'     > Romanian              </option>
<option value='rus'     > Russian               </option>
<option value='slk'     > Slovakian             </option>
<option value='slv'     > Slovenian             </option>
<option value='spa'     > Spanish               </option>
<option value='spa_old' > Old Spanish           </option>
<option value='sqi'     > Albanian              </option>
<option value='srp'     > Serbian (Latin)       </option>
<option value='swa'     > Swahili               </option>
<option value='swe'     > Swedish               </option>
<option value='tam'     > Tamil                 </option>
<option value='tel'     > Telugu                </option>
<option value='tgl'     > Tagalog               </option>
<option value='tha'     > Thai                  </option>
<option value='tur'     > Turkish               </option>
<option value='ukr'     > Ukrainian             </option>
<option value='vie'     > Vietnamese            </option>
</select>

<button onclick="recognizeFile('../../tests/assets/images/simple.png')">Sample Image</button>
<input type="file" onchange="recognizeFile(window.lastFile=this.files[0])">

<div id="log"></div>


<style>
#log > div {
    color: #313131;
    border-top: 1px solid #dadada;
    padding: 9px;
    display: flex;
}
#log > div:first-child {
    border: 0;
}


.status {
	min-width: 250px;
}
#log {
    border: 1px solid #dadada;
    padding: 10px;
    margin-top: 20px;
    min-height: 100px;
}
body {
    font-family: sans-serif;
    margin: 30px;
}

progress {
    display: block;
    width: 100%;
    transition: opacity 0.5s linear;
}
progress[value="1"] {
    opacity: 0.5;
}
</style>