Speech Recognition Playground

Fast, accurate and free online piaskownica rozpoznawania speech tool running directly in your browser.

Secure (SSL)

Client-Side Processing

100% Free

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Instructions

1

Enter data
Enter content, paste text or load a file from disk.
2

Click the button
The tool will immediately process your data in the browser.
3

Get the result
Copy the finished text or save the file to your device.

                                                function runTool() {

                                                  return "Result ready in 0.1s";

                                                }

Settings

Lang

Input data

74 characters

Interim Tool Option

Continuous Tool Option

Normalize Tool Option

Result

transcript: Try dictating: “Schedule a meeting tomorrow at 10 and send a recap email.” lang: en-US words: 13 chars: 74 lines: 1 normalized: Yes

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Speech recognition sandbox - Web Speech API in the browser

Speech recognition sandboxis an interactive tool for testing the browser-based Web Speech API - a technology that enables converting speech into text (Speech-to-Text) directly in the browser, without the need to install additional software.

What is Web Speech API?

Web Speech API is a W3C standard that allows web applications to access speech recognition (SpeechRecognition) and voice synthesis (SpeechSynthesis) functions built into the browser. Speech Recognition is supported by Google Chrome, Microsoft Edge and Safari - Firefox does not support SpeechRecognition in the stable version. The API sends the recorded audio to the Google cloud or local system and returns the transcribed text.

How does the speech recognition sandbox work?

Click the run button and allow the browser to access your microphone. Speak clearly - API transcribes your speech in real time. The results appear on an ongoing basis (interim results) and are finalized after the end of the statement (final results). You can choose the recognition language (Polish, English, German and others), enable continuous listening mode and see the confidence score for each transcription.

Applications of speech recognition in applications

Web Speech API opens many possibilities: dictating text instead of writing (especially useful on mobile devices), voice control of a web application, voice search, transcription of notes and meeting recordings, support for people with physical disabilities, learning foreign languages (comparing pronunciation with transcription) and creating voice chatbots.

Web Speech API limitations

The API requires an Internet connection (sends audio to the Google server), works mainly in Chrome and Edge, the recognition quality depends on the microphone and acoustic conditions, and privacy may be a questionable issue (recordings go to Google servers). For production use, consider alternatives: Whisper (OpenAI, open-source, runs on-premises) or Azure Cognitive Services Speech.

Frequently asked questions

Does speech recognition work in Polish?

Yes - Web Speech API supports Polish (code: pl-PL). The recognition quality of Polish is good, although slightly worse than that of English due to its complex morphology and inflection. Specialized words, proper names and regional accents may be transcribed incorrectly.

Is speech processed locally or in the cloud?

In Chrome, speech is sent to Google servers for processing. This means you need internet and accept Google's privacy policy. Local processing via Web Speech API is not possible. For offline processing, use the Whisper.cpp or Vosk library.

How to improve speech recognition accuracy?

Speak clearly and at a normal pace, use a good quality microphone, minimize background noise, speak into the microphone from a distance of 20-30 cm. In your code, you can use SpeechGrammarList to point to specific phrases and keywords, which greatly improves the recognition of technical terminology or proper names.

What browsers does Web Speech API work on?

Full support: Chrome (desktop and Android), Microsoft Edge. Partial: Safari (voice synthesis only from iOS 14.5, recognition from Safari 14.1 on macOS). No support: Firefox (speech recognition is not implemented in the stable version), Opera, older versions of mobile browsers.

How to integrate speech recognition in your web application?

Basic JavaScript code:const recognition = new webkitSpeechRecognition(); recognition.lang = 'pl-PL'; recognition.onresult = (e) => console.log(e.results[0][0].transcript); recognition.start();. Remember to handle errors (onerror), inform the user about required microphone permission, and test on supported browsers.