Yes, within the free size limit. PRO supports much larger MP4 files and parallel batch extraction.
PDF.to 读取或存储我的MP4 内容吗?
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No. The MP4 video and the Opus audio output are deleted within an hour. Conversion runs in an isolated worker.
我能从多个 MP4 文件中提取音频吗?
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Yes — drop a folder of MP4 videos and you will get a ZIP of Opus files back, one per source video.
Opus 将保存标签和元数据吗?
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Title, artist, and album tags are populated from the MP4 container metadata when available. You can edit them after extraction with our audio-tag tool.
转换器是否对流视频 URL 工作?
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No — PDF.to converts files you upload, not third-party stream URLs. Download the MP4 legally first, then upload it for Opus extraction.
Why is the Opus file much smaller than the MP4 video?
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Because the video stream (typically 90%+ of file size) is discarded. Only the audio track ends up in the Opus, which is why it can drop from gigabytes to a few megabytes.
