# Specs and loudness

> File details, loudness, and how streaming services will play your master.

Source: https://docs.wavdrop.link/specs-and-loudness

WAVDROP reads every file when you upload it, so you don't have to open it in another app to check what you're sending.

## What you see

Each song shows its sample rate, bit depth and loudness. Loudness is integrated loudness in LUFS, measured on upload.

## How streaming services will play it

Streaming services turn loud masters down, and some turn quiet ones up. Open the loudness on a song to see, service by service, what happens to this master:

- Spotify (Normal, Loud and Quiet settings, plus the web player, which doesn't normalize)
- Apple Music with Sound Check
- YouTube
- SoundCloud

Each row says whether the service turns the track down, lifts it, or leaves it alone, and why. For example, YouTube doesn't raise quieter masters, and some services stop lifting a track before its peaks would clip.

## Hear it as on a service

Choose **Hear it as on** and pick a service to play the song at the level that service would. It can turn a track down to show you a loud master's real level. It can't preview a boost.

> [!NOTE]
> Figures for Apple Music and YouTube are based on measurements published by others, since neither documents its exact rules. Treat them as a close guide, not a guarantee.

## Show specs to your client

Your client doesn't see technical details unless you want them to.

- **Show client technical info** in **Project settings** decides whether specs appear on that project's share page.
- **Auto show tracks metadata** in **Settings** opens every project with specs showing, for you.