Is my screen recording uploaded?

No. Screen capture uses getDisplayMedia and MediaRecorder entirely in your browser. The recording never leaves your device.

What format is the download?

Recordings are downloaded as WebM video, which is the native output of the MediaRecorder API in Chrome and Edge.

Can I record system audio?

Yes. Keep the "Record System / Tab Audio" switch on, then tick the "share audio" checkbox in the browser picker when you choose a screen or tab.

返回 Ercc

屏幕录制

直接在浏览器中录制屏幕、窗口或标签页。下载为 WebM，不上传任何内容。

No Upload Required Lossless Output Instant Download PCM 16-bit WAV

00:00

Ready — pick a screen or window to share

录制麦克风

把你的讲解声音一起录进去

录制系统 / 标签页声音

还需在弹出的选择器中勾选「分享音频」

Captures your screen or a window with your browser — the recording is saved locally on your device.

How It Works

Three simple steps —everything happens in your browser.

Upload MP3 file

Drag and drop or click to select your MP3 audio file from your device.

Convert to WAV

Your MP3 is decoded and re-encoded as uncompressed PCM 16-bit WAV audio instantly.

Download WAV

Download your lossless WAV file immediately. No quality loss, no waiting.

为什么使用 Ercc 屏幕录制？

100% Private —No Server Uploads

Your audio files never leave your device. All conversion uses the Web Audio API locally in your browser.

Lossless WAV Output

Get uncompressed PCM 16-bit WAV audio —perfect for professional editing, mixing, and mastering.

Universal Compatibility

WAV is supported by virtually every audio editor, DAW, and media player on all platforms.

Instant Conversion

No waiting for server processing. Your MP3 is decoded and converted to WAV right in your browser.

Frequently Asked Questions

Is my MP3 file uploaded to a server?

No. All conversion happens 100% in your browser using the Web Audio API. Your file never leaves your device, ensuring complete privacy and security.

What quality is the WAV output?

The output is uncompressed PCM 16-bit WAV at the original sample rate of your MP3 file. No quality is lost during the conversion process.

Why are WAV files so much larger than MP3?

WAV stores raw uncompressed audio data, while MP3 uses lossy compression. A typical MP3 is about 10% the size of its WAV equivalent. The trade-off is perfect audio fidelity.

Can I record my microphone at the same time?

Yes. Turn on "Record Microphone" before you start. Your voice and the system/tab audio are mixed into a single track with the Web Audio API, so the exported WebM contains both. You can also pick which microphone to use and watch a live level meter to confirm it is picking up sound.