SoundHalo tools
Work with your recording
Choose a task. Local checks stay on your device; transcription and cleanup use the SoundHalo API.
Open batch transcriptionTranscripts and captions
Audio to text
Transcripts and timestamps from spoken recordings.
Cloud transcriptionMP3 to text
Transcribe MP3 recordings and export the text.
Cloud transcriptionSRT generator
Create timed subtitle files from speech.
Cloud transcriptionSubtitle validator
Check SRT and WebVTT syntax, invalid times, overlaps, empty cues and reading speed.
Local processingSRT to WebVTT converter
Convert SRT subtitles to WebVTT, with timing checks before download.
Local processingWebVTT to SRT converter
Convert WebVTT captions to SRT for video editors and subtitle uploads.
Local processingPodcast transcript generator
Transcribe a podcast recording, edit the result and export text or timed captions.
Cloud transcriptionInterview transcription
Turn recorded interviews into editable transcripts, with timestamps and optional speaker labels.
Cloud transcriptionM4A to text converter
Transcribe M4A voice memos and recordings without converting them to MP3 first.
Cloud transcriptionAudio to SRT
Generate timestamped SRT subtitles from spoken audio and review the cues before export.
Cloud transcriptionM4A to SRT
Create SRT captions from an M4A voice memo, lecture or interview recording.
Cloud transcriptionWebVTT generator
Generate WebVTT captions from speech for HTML video players and web publishing.
Cloud transcriptionSpeaker-labeled transcription
Transcribe an interview with optional speaker detection, then review and rename the labels.
Cloud transcriptionRecording checks and exports
LUFS meter
Measure integrated loudness, sample peaks and estimated true peak without uploading your recording.
Local processingAudio channel inspector
Find silent channels, uneven levels and stereo phase cancellation before editing or transcribing.
Local processingStereo to mono converter
Mix channels or keep only the left or right channel. Preview and download a mono WAV.
Local processingSplit stereo into mono files
Download each channel separately as a mono WAV. Useful for interviews recorded on separate tracks.
Local processingAudio sample-rate converter
Resample audio to 8, 16, 22.05, 24, 44.1 or 48 kHz and download a PCM WAV.
Local processingWAV file diagnostic
Check RIFF headers, audio format chunks and declared file lengths. Read-only, with no upload.
Local processingAudio normalizer
Adjust integrated loudness for a recording.
Cloud processingBackground noise remover
Reduce steady noise and listen to the result.
Cloud processingMicrophone test
Check your input before recording.
Local processingNo-upload tools
Browse ten free audio and subtitle tools that run on your device. No account or cloud processing required.
Recording guides
Troubleshoot loudness, channel layout, captions and damaged recordings.