免费的音频转换器：视频转 MP3、做铃声
完全免费、无广告、无内购。视频转音频、MP3 格式转换、音频提取、裁剪，还能一键把音频做成手机铃声——全部在 iPhone 和 iPad 本地完成，不上传云端、不要账号、不偷偷扣费。
A free audio converter — video to MP3 & ringtones
Completely free, no ads, no in-app purchases. Convert video to MP3, change formats, extract audio, trim, and make ringtones — all locally on your iPhone or iPad. No cloud, no account, no surprise charges.
- 完全免费、无广告、无内购——导出和保存都不收费，没有会员墙
- 视频转音频 / 音频提取：从 MP4、MOV、AVI、MKV 等视频提取原声并导出 MP3
- 多格式互转：M4A、AAC、MP3、WAV、CAF / Apple Lossless、Ogg + Opus、MP4
- 制作手机铃声：裁出 30 秒，配「库乐队」一键设为来电铃声
- 精准裁剪、调速、调音量，导出前一步到位
- 本地处理，文件不上传云端，断网也能用
- Completely free — no ads, no in-app purchases, no paywall to export or save
- Video to MP3 / audio extraction from MP4, MOV, AVI, MKV
- Convert between M4A, AAC, MP3, WAV, CAF / Apple Lossless, Ogg + Opus, and MP4
- Ringtone maker: trim a 30s clip and set it as your ringtone via GarageBand
- Precise trimming, speed and volume control before export
- Fully on-device — files are never uploaded, works offline
- 视频提取音频转 MP3，会议录音转格式方便分享
- 把喜欢的歌裁成 30 秒，做成专属手机铃声
- 一键裁掉多余片头片尾，只导出精华部分
- 网课倍速回放、播客调速复听，整理笔记更高效
- Extract audio from video as MP3, or convert meeting recordings to share
- Trim a favorite song into a 30s custom ringtone
- Cut unwanted intros and outros — export only what matters
- Speed up lectures, slow down podcasts — review at your own pace
音频随转完全免费，没有广告、没有内购、没有“免费试用后自动扣费”。所有音频处理（转换、提取、裁剪、铃声导出）都在设备本地完成，你的文件不会上传到任何服务器。
WiFi 传输功能仅用于同一局域网内通过浏览器向设备导入文件，传输完成后一切处理仍在本地进行。
AudioTools is completely free — no ads, no in-app purchases, and no “free trial that auto-charges”. Every operation (convert, extract, trim, ringtone export) runs entirely on your device; your files are never uploaded to any server.
WiFi Transfer only imports files from a browser on the same local network. Once transferred, all processing stays on device.