5 Best Free Transcription Apps in 2026

You record a 40-minute meeting on your phone. The audio came out fine. But turning that into text — without paying for a dollar-denominated subscription, without uploading files to some website you’ve never heard of, without praying the AI gets Portuguese words right — that’s a whole different story.

Most free transcription tools were built for English. When the audio is in Portuguese, accuracy tanks. Words turn into random phonemes. “Reunião de alinhamento” becomes “reunião di alinhamen.”

We tested the top free transcription apps with real Portuguese audio — meetings, lectures, interviews, and WhatsApp voice messages. Here are the results: the 5 that actually work, with pros, cons, and what each one truly delivers.

What we evaluated

• Portuguese accuracy: did the app actually understand, or just pretend to?
• Free plan minute limit
• Extra features: summaries, keyword search, export
• Privacy: where does your audio end up?

1. Sintesy — the homegrown alternative with real Portuguese support

Sintesy was built for Portuguese from day one. Its speech recognition is trained on real PT-BR audio data — it’s not a generic multilingual model adapted after the fact.

How it works:

You record directly in the app or upload any audio file. Within minutes, Sintesy delivers:

• Full transcription with timestamps
• Auto-generated summary with key points
• Structured outline by topic
• Visual mind map based on the content
• Keyword search within the transcription

Highlight: Sintesy’s free plan includes 60 minutes of transcription per month — no credit card, no expiring trial. Unlike tools like Otter.ai (which caps the free plan at 300 monthly minutes but with poor Portuguese accuracy), Sintesy prioritizes recognizing Brazilian accents and regional variations.

Best for: Anyone who needs to transcribe, summarize, and organize Portuguese content — meetings, lectures, interviews, social media content.

2. Otter.ai — the most well-known, but not the best for Portuguese

Otter.ai is the biggest name in AI transcription. It records, transcribes in real time, and identifies who’s speaking — it works especially well in English.

Portuguese limitations:

• Accuracy drops significantly with Brazilian accents
• Compound words and regional slang come out garbled
• The free plan caps at 300 minutes per month
• Portuguese transcriptions often need manual review

Worth it if: You mostly work with English audio and need real-time transcription during Zoom or Google Meet meetings.

3. Google Docs — free voice typing, no installation required

Google Docs has a built-in voice typing feature. You open a document, turn on the tool, and your microphone picks up what you say.

What works well:

• Completely free, no minute limit
• Decent Portuguese recognition
• Already integrated with Google Drive
• Works right in the browser, no installation needed

What’s missing:

• No audio file upload — live microphone only
• No summaries, no speaker identification
• No timestamps, no search, no mind maps
• Transcription is continuous — you have to pause and review manually

Best for: Dictating short Portuguese texts directly into a document. Not suitable for transcribing recorded meetings or lectures.

4. Whisper (OpenAI) — technical accuracy, but requires technical know-how

Whisper is OpenAI’s speech recognition model. It’s free, open source, and runs locally on your computer — your audio never touches any server.

Strengths:

• One of the most accurate models for Portuguese
• Runs offline — total privacy
• Supports dozens of languages
• Transcription with timestamps

The downsides:

• Requires installing Python and dependencies via terminal
• Runs on CPU or GPU — needs a decent computer
• No graphical interface — it’s command-line only
• No summaries or content organization

Best for: People comfortable with the terminal who prioritize privacy and don’t mind spending a few minutes setting up the environment.

5. Microsoft Word — integrated transcription for subscribers

Word (web and desktop versions for Microsoft 365) has built-in audio transcription. You upload the file, it transcribes it, and inserts the text directly into your document.

Advantages:

• Familiar interface for Office users
• Transcription with speaker labels
• OneDrive integration
• Direct export to .docx

Limitations:

• Requires a Microsoft 365 subscription — not actually free
• Portuguese recognition is decent but trails Whisper and Sintesy in accuracy
• 300-minute monthly upload limit
• No intelligent auto-summary

Best for: People already paying for Microsoft 365 who want a solution integrated with the Office suite.

Quick comparison

Which one should you pick?

It depends on what you need:

• Just need text, no frills? Google Docs works — but only for live voice.
• English audio + live meetings? Otter.ai covers the basics with solid accuracy.
• Absolute privacy + technical skills? Whisper is unbeatable.
• Already have Microsoft 365 and want integration? Word works without leaving the ecosystem.
• Portuguese audio + want automatic summaries, outlines, and mind maps? Sintesy was built exactly for that.

The reality is that quality free transcription in Portuguese is still rare. Most tools treat our language as an afterthought. Sintesy flips that logic — and the free plan is enough to cover most people’s monthly flow of meetings and lectures.