Upload your M4R file using the picker above and the converter detects the source type and runs the M4R → MP4 pipeline. The result downloads automatically when conversion completes; no account needed for one-off conversions.
Is the M4R to MP4 converter free?
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Yes — basic M4R → MP4 conversion is free with no registration. Premium adds higher per-file size limits, more parallel batch workers, and removes ads.
How big a M4R file can I convert to MP4?
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Free accounts: up to 100 MB per M4R file. Premium: typically 1 GB per file, depending on the M4R source type. Very large files are split into chunks server-side when the MP4 format allows.
Will conversion change the content of my M4R?
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Conversion preserves all information that both M4R 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.
M4R ファイルを MP4 に一度に変換できますか？
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Yes — drop multiple M4R 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.