ステップ1: アップロード AMR 上記のボタンを使用するか、ドラッグ アンド ドロップでファイルをアップロードします。
ステップ 2: 「変換」ボタンをクリックして変換を開始します。
ステップ3: 変換したファイルをダウンロードする MP4 ファイル
AMR に MP4 変換FAQ
How do I convert a AMR file to MP4?
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Upload your AMR file using the picker above and the converter detects the source type and runs the AMR → MP4 pipeline. The result downloads automatically when conversion completes; no account needed for one-off conversions.
Is the AMR to MP4 converter free?
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Yes — basic AMR → MP4 conversion is free with no registration. Premium adds higher per-file size limits, more parallel batch workers, and removes ads.
How big a AMR file can I convert to MP4?
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Free accounts: up to 100 MB per AMR file. Premium: typically 1 GB per file, depending on the AMR source type. Very large files are split into chunks server-side when the MP4 format allows.
Will conversion change the content of my AMR?
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Conversion preserves all information that both AMR and MP4 can represent. Format-specific features that the MP4 format doesn't support (e.g. vector data in raster output, formulas in plain-text output) are rasterized or stripped — see the format-specific notes on the result page.
AMR ファイルを MP4 に一度に変換できますか？
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Yes — drop multiple AMR files into the upload zone and they are queued in parallel. Premium has more parallel workers; on a 50-file batch this is the difference between minutes and seconds.