--- title: Batch MP3 Translator for Audio Libraries | Smartcat description: Translate a whole folder of MP3 files as one project. Podcast archives, interviews and call recordings share a single glossary across every file. Try it free. canonical: https://www.smartcat.com/mp3-translator/ language: en updated: 2026-08-24 --- # Batch MP3 Translator for Audio Libraries | Smartcat ## MP3 Translator for Batch Workflows Translate a whole folder of MP3s as **one project** — podcast back catalogs, interview archives, call-recording libraries — with a single glossary and translation memory applied across every file. Translating one recording? The [audio translator](https://www.smartcat.com/audio-translator/) handles that in a few clicks. - [Book a demo](https://www.smartcat.com/book-a-demo/?n-upl) - [Sign up free](https://smartcat.com/sign-up?n-upl) There is **no cap on how many files a project can hold**, and that does not change by plan. The only ceiling is per-file size: individual files reach 6 GB, and anything over 1 GB is worth splitting into parts. | | What you have | Where to go | One recording, one target language | [Audio translator](https://www.smartcat.com/audio-translator/) — the hub | A folder of episodes, interviews or call recordings | This page | A video file rather than an audio file | [Video translation](https://www.smartcat.com/video-translation/) | Subtitles you already have as .srt or .vtt | [SRT translation](https://www.smartcat.com/srt-translation/) ## How do I translate a folder of MP3 files? Upload the MP3s exactly as they are — there is no conversion step. MP3 is natively supported, alongside MP2/M2A, M4A, AAC, OGG, FLAC and WMA. Add them to one project and the flow is the same four steps as any audio file: **transcribe, correct the transcript, translate** into any of 280+ languages, and **export** as text, subtitles, or an AI voice track in one of 35 voice-over locales. When you are done, select the projects and download once — Smartcat returns a single ZIP with every file in its original format, sorted into folders. Translate a folder of MP3s free 15 days, 15,000 Smartwords, no credit card. One recording only? Start on the [audio translator](https://www.smartcat.com/audio-translator/). - [Translate MP3 files free](https://smartcat.com/sign-up?main-mp3-translator) - [Go to the audio translator](https://www.smartcat.com/audio-translator/) ## What keeps names consistent across fifty episodes? A glossary. Add names, product terms and recurring phrases once, and every file in the project is checked against it — a QA rule flags any segment where the approved term was not used. Add a name in episode nine and it applies across the whole back catalog, so you fix it once rather than nine times. Translation memory does the same job for repeated lines: a stock intro or legal disclaimer read at the top of every episode is translated once and reused, so you are not paying for it fifty times. Both are why a folder of files belongs in one project rather than fifty separate uploads. Recordings stay inside an isolated workspace under [SOC 2 Type II](https://www.smartcat.com/security/) controls, encrypted in transit and at rest. ## Frequently Asked Questions ### Do I need to convert my MP3 to text before translating it? No — transcription is the first step of the product. Drop the MP3 in and Smartcat produces a timed, speaker-labeled transcript automatically; you review it once, then translate. The only time you would pre-convert anything is if your recording is inside a video container, in which case use the [AI video translator](https://www.smartcat.com/video-translation/) instead. ### What MP3 files are supported? MP3 is natively supported, and so are MP2/M2A, M4A, AAC, OGG, FLAC, and WMA — files up to 6 GB, with anything over 1 GB best split into parts. Audio quality matters more than the container: clear speech transcribes well; heavy background music or crosstalk needs a pass in the transcript editor. There is no published limit on how long a recording can be and no cap on how many files a project can hold — the only ceiling is per-file size, and it is the same on every plan. ### Can I translate many MP3 files at once? Yes — that is what this page is for. Upload the whole set into a single project and translate them together; batches of hundreds of files are supported. The project's glossary and translation memory apply to every file in it, which is what keeps recurring names and phrases identical across the set. Download once and you get a single ZIP, every file in its original format, sorted into folders. ### Should I use this page or the audio translator? If you have one recording, use the [audio translator](https://www.smartcat.com/audio-translator/) — it is the same engine and a shorter path. Use this page when you have a set: a podcast back catalog, an interview archive, a library of call recordings. The difference is not the format, it is whether consistency across files matters to you.