Free, no login, and your file never leaves your device.
audio to MP3, converted on your own machine
Converting audio to MP3 normally means handing your file to a website that uploads it, processes it on a machine you cannot inspect, and asks you to trust a retention paragraph. FileForge removes that step: the Convert Audio tool runs inside this browser tab, so a audio file becomes MP3 without ever crossing the network.
Convert audio between MP3, WAV, OGG, AAC, and FLAC with a bitrate selector, powered by FFmpeg compiled to WebAssembly. Everything happens locally in your browser: nothing is uploaded, stored, or logged.
Because the conversion happens on your hardware, throughput depends on your CPU rather than a shared free tier — there are no file-size caps, no watermarks, no daily quotas, and no paid tier that unlocks the real feature set. It also means the page keeps working offline in the browser once loaded, which is handy for confidential material on a locked-down laptop or a phone in aeroplane mode. One honest caveat: the FFmpeg engine downloads once per session (~30 MB) before the first conversion.
Read how the in-browser processing works.
audio to MP3 — frequently asked questions
- Do I need to create an account to use Convert Audio?
- No. FileForge requires no sign-up or login — just open the tool and use it.
- Is Convert Audio really free?
- Yes, completely free with no hidden limits or premium paywall.
- Does Convert Audio upload my file to a server?
- No. Everything runs locally in your browser. Your file is never uploaded, stored, or transmitted anywhere.
- Is there a file size limit?
- There is no artificial limit. The practical ceiling is your device's available memory, so very large files work best on a desktop browser with plenty of free RAM.
- Does Convert Audio work offline in the browser?
- Once the page (and, for audio and video, the FFmpeg engine) has loaded, the tool keeps working without a network connection because all of the processing code already lives in your browser.
- Is Convert Audio private enough for confidential documents?
- Yes. Because the file is processed on your own CPU, contracts, medical scans, ID photos and payroll data never travel over the network — you can verify that with your browser's network tab open.
- Which browsers are supported?
- Any modern browser with WebAssembly support — Chrome, Edge, Firefox, Safari, and their mobile versions. No plugins or extensions are required.
- What are the limitations of Convert Audio?
- The FFmpeg engine downloads once per session (~30 MB) before the first conversion.