Audio Converter Online

Audio Converter Online is an online audio converter that runs in your browser. Convert MP3, WAV, M4A and OGG files, or pull an MP3 soundtrack out of a local MP4 video. Conversion uses ffmpeg.wasm on your device, so the recording is not uploaded to a conversion server. Local format conversion is free and needs no account. For MP3 output you can choose 128, 192 or 320 kbps.

When you need the words rather than the sound, AI transcription turns local audio and video recordings into a transcript with timestamps and speaker labels, saved as TXT, SRT, VTT or HTML. It suits interviews, lectures, meetings and voice memos, and the subtitle files work in common subtitle editors and players.

AI text to speech turns written text into narration with a selected voice. Type or paste text, or upload TXT, Markdown or PDF; PDF text is extracted in the browser first. The site also includes an AI voice changer, an AI voice designer that creates a voice from a description, and AI voice cloning that requires a consent recording.

AI features need sign-in and paid credits: transcription uses 2 credits per minute, and text to speech uses 1 credit per 100 characters. Starter, Unlimited and Max plans are billed monthly or yearly. Local browser conversion stays free without sign-in.