Free tools

Recording tools.

Small, free utilities for people who record on their phone. All of them run entirely in your browser — no account, no uploads.

Recorder

Free Online Voice Recorder

A free online voice recorder that needs no download and no account, and uploads nothing. Live waveform, pause and resume, crash recovery, non-destructive trim and WAV export, all on your device. Works with the network off.

Any device · instantOpen tool →

Transcription

Free Audio to Text Online

Free audio to text online — unlimited, no sign-up, and nothing uploaded. Whisper runs on your own device in the browser, with clickable timestamps, 99 languages, inline editing and TXT, SRT, VTT, Markdown or JSON export. Works offline after the first load.

Any device · minutesOpen tool →

Converter

Free Online Audio Converter

Convert audio and video to MP3, WAV, M4A, Ogg, Opus or FLAC entirely on your device — nothing uploaded, no file size limit, no sign-up. Batch queue with ZIP download, trim before converting, metadata stripped by default, and even AMR or WMA handled by an on-device ffmpeg engine.

Any device · secondsOpen tool →

Compressor

Free Audio Compressor

Reduce audio file size on your own device: pick a quality preset, a target size in MB or a percentage, and the bitrate is solved for you. A/B the original against the compressed version at the same playhead before you keep it. Free, no upload, no sign-up.

Any device · secondsOpen tool →

Inspector

Free Audio Metadata Viewer

Drop in an audio file and get a plain-English answer: what it actually is, when it says it was made, which software has written it, and whether it is carrying your location. Read entirely on your device — no upload, no sign-up. Honest about what metadata cannot tell you: it issues no authenticity verdict, because none is possible.

Any device · about a secondOpen tool →

Legal information

Recording Consent Checker

Can you record this conversation? Answer a few questions to see which recording-consent rules may apply where you and the other participants are, with the official statute behind every answer — and a clear way to ask permission.

Any device · about two minutesOpen tool →

Diagnostic

Background Recording Troubleshooter

Recording stopped after a call, screen lock, battery saver or another app? Answer a few questions to get the likely cause, device-specific settings to check and a reliability test.

iPhone & Android · about one minuteOpen tool →

Compatibility

Will BlackBox Work on My Phone?

A realistic read on whether your iPhone or Android phone can record reliably in the background: a score out of 100 with every deduction explained, your storage and retention limits, the interruptions to expect, and a setup checklist for your device.

iPhone & Android · about one minuteOpen tool →

Calculator

Audio Storage Calculator

See how many MB or GB voice recordings use per hour, day and month at any quality — plus a cleanup schedule that stops your phone filling up.

Any device · instantOpen tool →

Record your whole day, privately.

BlackBox is a 24/7 background voice recorder with scheduling, on-device transcription and local storage. Free on iPhone and Android.

Download on theApp Store Get it onGoogle Play