Audio to Base64 Converter
Encode MP3, WAV, FLAC, OGG, M4A and other audio files to base64 for AI speech APIs — or decode base64 back to a downloadable audio file. Everything runs in your browser.
Paste your key once — it's saved in your browser and auto-filled into code snippets.
Drop an audio file here or click to browse
MP3, WAV, FLAC, OGG, M4A, AAC, OPUS, WebM
How it works
Upload audio
Drop or select any audio file. The browser reads it using the FileReader API — no network request is made.
Get base64 string
The raw bytes are encoded to base64 instantly. Copy it into an API request body or use the ready-made code snippets.
Send to speech API
Pass the base64 string in the input_audio.data field of the transcriptions endpoint. Works with Sarvam and Whisper models.
Frequently asked questions
Is my audio uploaded anywhere?
No. The FileReader API reads the file entirely in your browser's memory. Nothing is sent to any server — not even AICredits' servers.
Which audio formats are supported?
MP3, WAV, FLAC, OGG, M4A, AAC, OPUS, and WebM. If the STT model you're using has format restrictions, you may need to convert first.
Why base64 instead of a file upload?
The AICredits audio transcription endpoint accepts base64-encoded audio in the request JSON body — the same format as OpenAI's realtime and inline audio inputs.
What models support audio transcription?
Sarvam-M (Indian languages + English), Whisper-Large-V3, and other speech models available on AICredits. Check the audio docs for the full list.
Ready to transcribe audio with AI?
AICredits gives you access to Sarvam-M, Whisper, and 300+ other models — one API key, pay in INR.