Key takeaways
- Read PDFs aloud with Edge's Read aloud, Adobe Acrobat's Read Out Loud, or your phone's built-in reader.
- Android has Select to Speak and Google's text-to-speech engine; iPhone has Spoken Content and Dictation.
- Speech to text converts audio into features, then a neural model predicts the most likely words.
- Speech recognition dates to the 1950s; deep learning made it accurate in the 2010s.
- AI voices aid accessibility and learning, but voice cloning raises consent and fraud risks.
To have a PDF read aloud, open it in Microsoft Edge and choose Read aloud, use Adobe Acrobat's Read Out Loud, or use your phone's built-in screen reader features. Speech to text works the other way, turning your voice into text through dictation on phones, keyboards and apps. I built the OCR and Speech Workspace, which includes live speech-to-text alongside OCR, so this page covers reading PDFs and text aloud, Android, iPhone, Samsung and WhatsApp, how speech recognition works, its history, ChatGPT, and AI voices.
How do I use text to speech on a PDF?
On a computer, open the PDF in Microsoft Edge and press Ctrl+Shift+U or choose Read aloud; Edge reads the text with natural voices and highlights words. In Adobe Acrobat Reader, use View, then Read Out Loud. On phones, use Select to Speak on Android or Speak Screen on iPhone.
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If nothing is read, the PDF may be a scanned image without text. Run OCR first, with Acrobat, a scanner app or a tool such as OCRmyPDF, to add a text layer. For long documents, choose a comfortable voice speed, and use headphones to focus. Students often use this to review notes while commuting or to proofread their own reports by ear.
How do I use text to speech in general?
Most devices have built-in text to speech. On Windows, use Narrator or Edge's Read aloud; on macOS, enable Spoken Content and press the shortcut to speak selected text; on phones, use the accessibility reader features. Browser extensions and apps add more voices.
Tips for better listening:
- Choose a natural, neural voice in system settings.
- Adjust the speed; many people prefer slightly faster than normal speech.
- Use reader mode on web pages to remove clutter before reading.
- Download offline voices for reading without internet.
- For other languages, install the language's voice data.
Text to speech supports accessibility for people with visual impairments and dyslexia, and helps anyone learn while multitasking.
How do I use text to speech on Android?
Turn on Select to Speak in Settings under Accessibility, then tap its icon and select text on screen to hear it read aloud. Android's text-to-speech settings let you choose the engine, language, voice and speed, usually with Google's speech services.
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For whole pages, use the Read aloud feature in the Google app or Chrome where available, or "Reading mode" for clean, readable text with playback. TalkBack is Android's full screen reader for people with visual impairments, which reads everything as you navigate. Install additional language voices, such as Hindi, from the text-to-speech settings.
How do I use speech to text on iPhone?
Tap the microphone key on the iPhone keyboard and start speaking; Dictation converts your speech to text in any app with a text field. Say punctuation such as "comma" or "full stop", and tap the microphone again to stop.
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Enable Dictation in Settings under General, then Keyboard, if the microphone key is missing. Newer iPhones process many languages on the device, which works offline and keeps audio private. Voice Control, in Accessibility settings, lets you control the whole phone and edit text by voice. For long recordings, the Voice Memos app can also create transcripts on supported iOS versions.
How do I use speech to text on Samsung phones?
Use the microphone key on Samsung Keyboard or Google's Gboard to dictate into any text field. Samsung phones also support Google's voice typing, and recent Galaxy models include transcription features in apps such as Voice Recorder and Notes.
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If the microphone key is missing, check keyboard settings for voice input, and choose between Samsung voice input and Google voice typing. Download offline speech recognition languages in Google voice typing settings for faster, private dictation. Samsung's AI features on newer models can transcribe and summarise recordings and translate calls, depending on model and region.
How do I use speech to text in WhatsApp?
Use your phone keyboard's microphone key in the WhatsApp message box to dictate a text message, instead of the WhatsApp microphone button, which records a voice note. WhatsApp can also transcribe received voice messages into text on supported devices.
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To enable voice message transcripts, look for the transcripts option in WhatsApp's chat settings, choose your language, then long-press a voice message and select transcribe. Transcription happens on your device, so messages stay private. Availability and languages vary by device and region. Dictating messages is faster than typing for many people, but review the text before sending, especially names and numbers.
How does speech to text software work?
Speech recognition converts audio into a sequence of acoustic features, such as spectrograms, then a neural network predicts the most likely text. Modern systems are end-to-end deep learning models trained on thousands of hours of transcribed speech.
Models such as OpenAI's Whisper use an encoder that processes audio and a decoder that generates text tokens, learning pronunciation, vocabulary and context together. Language modelling helps choose between similar-sounding words. Live transcription processes audio in small streaming chunks to show text as you speak, which is how the OCR and Speech Workspace displays live speech-to-text. Accuracy depends on audio quality, accents, background noise and vocabulary.
How long has speech to text been around?
Speech recognition research began in the 1950s: Bell Labs' "Audrey" system in 1952 recognised spoken digits, and IBM's Shoebox in 1962 understood a few words. Consumer dictation arrived in the 1990s with products like Dragon NaturallySpeaking.
Statistical models dominated the 1980s to 2000s; deep learning brought dramatic accuracy gains from around 2010, enabling voice assistants such as Siri, Google Assistant and Alexa. Large models trained on huge multilingual datasets, such as Whisper in 2022, made accurate transcription in many languages widely available, including free open-source options you can run locally.
Can ChatGPT do speech to text?
Yes. The ChatGPT apps include voice features: you can dictate messages with the microphone, and voice conversations transcribe your speech and respond aloud. For developers, OpenAI offers speech-to-text models through its API, and its open-source Whisper model runs locally.
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For transcribing recordings, upload audio to tools built on these models, or use the API with your own app. Accuracy is high for clear speech in common languages; check names, numbers and technical terms. For private recordings, consider running Whisper locally so audio never leaves your device. Always get consent before recording or transcribing other people.
Is AI text to speech bad?
AI text to speech is mostly beneficial: it gives people with visual impairments, dyslexia or reading difficulties access to text, helps language learners, and makes content available in audio. Modern neural voices sound natural and support many languages.
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The concerns are real but specific: voice cloning can be misused for scams and impersonation, synthetic voices can spread misinformation, and voice actors raise concerns about consent and compensation. Responsible use means cloning only voices with explicit permission, labelling synthetic audio, and verifying unexpected voice requests for money or information through another channel.
Sources
- Radford et al., Robust Speech Recognition via Large-Scale Weak Supervision (Whisper, 2022)arxiv.org
- Apple Support, Dictate text on iPhonesupport.apple.com
- Google Accessibility Help, Select to Speaksupport.google.com
- Microsoft, Read aloud in Microsoft Edgemicrosoft.com
- Wikipedia, Speech recognitionen.wikipedia.org
GenAI engineer and AI product builder with 2+ years shipping production-grade AI systems: RAG pipelines, fine-tuned LLMs, hybrid retrieval and multi-modal apps across vision, speech and OCR, architected end to end from ingestion to deployment. Leads engineering for SCULT INDIA's 14-member team, founded the 500+ member TechVerse Enclave community and has mentored 200+ students. Three hackathon first prizes: Changethon 2025 (IIT Roorkee), Product Genesis at Vividhotsava 2025 (CSJMU) and BYTEBATTLE (MeetKats).
Open to GenAI roles, hackathon judging, mentorship sessions and guest talks at colleges. For campus sessions the inviting institution covers the visit end to end: travel (a First AC train ticket for journeys up to five hours, a flight for anything longer), accommodation, meals, and pickup and drop; the honorarium and workshop fees are negotiable on WhatsApp or on the call, and requests are welcome from institutions that can cover the visit this way. Email pranjulrathour41@gmail.com.
