Silent WAV and test tone generator

Use silence to reserve time

A silent clip can reserve a five-second gap before a narration is recorded, exercise an audio player’s duration and seek controls, or test whether an upload accepts a valid audio file. Watch the playback position rather than listening for sound. Silence cannot confirm that speakers, microphones or a transcription service work.

Use a tone to check a signal path

Choose 220, 440 or 880 Hz for a steady sine-wave tone. The signal peaks at about one tenth of full scale and has short fades at each end. Your device and player still control listening volume. Stereo duplicates the same tone on both channels; it is not a left/right separation test, a calibrated measurement signal or a hearing test.

Understand the file size

This tool creates an uncompressed, signed 16-bit PCM WAV with a 44-byte header. Its size is determined by duration, sample rate and channel count, even when every sample is silent.

bytes = 44 + seconds × sample rate × channels × 2
5 × 44,100 × 1 × 2 + 44 = 441,044 bytes

Use 48,000 Hz when your video workflow expects it, or choose the rate your application requires. A higher rate is not needed just to make silence. To test an arbitrary byte limit, use the exact-size test file generator.

WAV is not MP3

The download is a WAV container with PCM samples. Renaming it to .mp3, .m4a or .ogg does not convert the audio. If your uploader requires another codec or container, convert the fixture with a tool that supports that format and verify the converted file. This generator does not create speech, music or a compressed audio file.

Check the upload and playback separately

1. Create a short file and confirm the duration in a media player.
2. Upload it, then check the stored file type, byte count and duration.
3. Try another channel count or rate to check supported input combinations.
4. Download the stored file and open it again. A successful selection alone is not proof of a playable saved file.