What does this tool do?

It automatically aligns the Chinese and English versions of the same audio (dubbed cartoons, audiobooks, textbook recordings) sentence by sentence and produces alternating practice audio: one line Chinese, then the same line in English. This is a common format for comprehensible-input language learning.

Are my audio files stored anywhere?

Audio is only sent to a speech-recognition service to obtain per-sentence timestamps, and is never saved afterwards. The cutting and joining of the final file happens locally in your own browser; the server stores nothing.

What audio formats are supported?

MP3 files up to 50 MB (about 45 minutes) each. The Chinese and English versions must contain the same content in the same order.

What can I play the result on?

The output is a standard MP3 (192 kbps) that works on phones, computers, cars, and dedicated listening devices.

Why are some songs missing from the result?

Purely instrumental and sung passages are skipped automatically — they cannot be aligned reliably sentence by sentence. Skipping them keeps every line in the result a clean Chinese-English pair.

A listening tool for Mandarin learners

Make every line a step closer to Mandarin.

Turn matching Mandarin and English recordings into focused, sentence-by-sentence listening practice. Hear a meaning you know, then meet it in Chinese—at your pace.

Make your first study track Start free. A free account is required.
Just two MP3s and a browser.

Mandarin-first practice MP3 you can keep No files stored by us

Your listening studio

Build a Mandarin track

Choose two recordings of the same story or lesson. We match the lines, then make one clean track you can replay anywhere.

Free to try · MP3 export

01Mandarin recordingYour Chinese-language version

Choose a Mandarin MP3Browse files · up to 50 MB

02English counterpartThe same story, in English

Choose the matching English MP3Browse files · up to 50 MB

Both files should contain the same content in the same order. Different speaking speeds are fine. MP3 only · up to 50 MB per file.

Fine-tune your listening track

Pause between languages (seconds)

Pause between pairs (seconds)

Keep around each line (seconds)

Play the translation

1Bring two familiar recordingsUse the same dialogue, story or lesson in Mandarin and English.
2Let the lines find each otherAutomatic speech recognition aligns the matching sections—even when speakers have different pacing.
3Listen wherever you likePreview the result, download an MP3 and replay short, meaningful chunks.

Made for real-life listening

Familiar meaning. Fresh Mandarin.

Use the English you already understand as a bridge into spoken Chinese. One thought at a time makes it easier to notice sounds, tones and phrases in context—without turning listening into a vocabulary quiz.

Stay with the storyWork with bilingual audiobooks, course recordings and dubbed dialogue you already have.

Choose your rhythmStart with English meaning or go straight to Mandarin. Set pauses only if you want them.

Take it with youExport a standard MP3 for your phone, computer or favourite audio player.

Your file, your browserAudio is sent for transcription and alignment; the final cut-and-join happens on your device. We don't store your uploaded files.

Good to know

Before you press play.

Do I need Mandarin and English versions of the same audio?

Yes. This tool pairs an existing Mandarin recording with its English counterpart. The content and order should match; the timing and speaking pace don't have to.

Which files can I use?

MP3 recordings up to 50 MB each. Longer files are easier to process on a desktop browser.

Where is my audio processed?

The recordings are sent to a speech-recognition service to get sentence timestamps. The final audio is cut and joined in your browser, and we don't store your uploaded files.

Can I start with English, then hear Mandarin?

Yes. Open the track settings and choose English first or Mandarin first. Pauses default to zero, and you can add them if they help you practise.

Will songs or instrumental sections be included?

Speech recognition works best on spoken dialogue. Singing and instrumental sections may be skipped or aligned incorrectly.

Build a routine that sounds like you.Start with a free track, then see the plan that fits your listening habit.

View plans