Convert RAR to MP4

A downloaded video may arrive inside a RAR archive, while a phone, browser, television, or editor requires an MP4 file. Extracting the archive and, only when necessary, encoding the video produces a compatible file without confusing compression with video conversion.

What the RAR format is

RAR is a proprietary compressed archive format developed by Eugene Roshal and distributed through tools such as WinRAR. It packages one or more files, including videos, software, images, and multipart downloads; .rar is not a video container and cannot be converted directly into a playable MP4.

Common multipart names include video.part1.rar, video.part2.rar, and older sets containing video.rar, video.r00, and subsequent volumes. Keep every part in one folder, then open or extract only the first volume. A missing volume, wrong filename, password, or checksum error prevents complete extraction.

What the MP4 format is

MP4 is a multimedia container based on ISO Base Media File Format. It can hold different video and audio codecs, but H.264 video with AAC audio is the combination most broadly supported by phones, browsers, televisions, media players, and editing software. MP4 often provides smaller files than older or lightly compressed formats, but its size and quality depend on the codecs, bitrate, resolution, and frame rate.

If extraction produces an existing .mp4 file, no conversion is needed: copy or move it and test playback. Convert only when the extracted file uses an unsupported container or codec, or when a device or application specifically requires a different MP4 encoding.

How to extract and convert

Using desktop applications

1. Install WinRAR from win-rar.com, 7-Zip from 7-zip.org on Windows, or a macOS/Linux archive utility that supports RAR. On macOS, Keka is a commonly used option; on Linux, distribution packages such as unrar or unar can extract archives.
2. Place all archive volumes in the same folder. In WinRAR or 7-Zip, open the first volume—normally video.part1.rar or the older video.rar—and choose Extract to.... Enter the password if requested.
3. Inspect the extracted files and identify the actual video. Extraction preserves the source video exactly; it does not re-encode it.
4. If the file is already MP4, open it in the target application. Otherwise install HandBrake from handbrake.fr, open the extracted video, and choose a preset such as General → Fast 1080p30 or one matching the source resolution.
5. Set Format to MP4. In the Video settings, select H.264 (x264), retain the source frame rate, and use Constant Framerate for editing or workflows that require predictable timing.
6. In Audio, select AAC and a suitable bitrate, commonly 160–192 kbps for stereo. Choose an output filename ending in .mp4, then select Start Encode.

Using FFmpeg

FFmpeg is useful for batch processing and exact codec control. If the extracted video already contains MP4-compatible streams, remux it without re-encoding:

ffmpeg -i "input.mkv" -map 0 -c copy -movflags +faststart "output.mp4"

Remuxing is lossless, but it works only when every selected stream is supported by the MP4 container. Remove -map 0 or select streams explicitly if the source contains incompatible subtitles, attachments, or other data.

For a general H.264/AAC conversion, use:

ffmpeg -i "input.avi" -c:v libx264 -preset medium -crf 20 -c:a aac -b:a 192k -movflags +faststart "output.mp4"

CRF values around 18–23 are common for H.264; lower values usually increase quality and file size. Re-encoding cannot restore quality already lost in the source.

Using online services

For a small, non-sensitive archive, an online RAR extractor such as ezyZip may produce the video without installing software. You can then submit the extracted video—not necessarily the archive—to an online converter such as CloudConvert or FreeConvert, provided its current input formats, size limits, and codec options meet your needs.

Do not upload private recordings, confidential material, password-protected work, or copyrighted content to a third-party service when local extraction and conversion are available. Online services may also reject multipart archives, impose storage or duration limits, or delete files according to their stated retention policy.

Quality and compatibility limits

Extraction does not change quality. Remuxing with -c copy also avoids quality loss, while HandBrake or FFmpeg transcoding decodes and re-encodes the media and can reduce quality. Repeated transcoding causes additional loss.

Check the source resolution, frame rate, audio tracks, subtitles, and rotation metadata after conversion. A file may have an .mp4 extension yet use codecs that a particular device cannot decode; H.264 video, AAC audio, a standard pixel format such as yuv420p, and a constant frame rate provide broad compatibility.

Play the extracted file before converting and verify the finished MP4 from start to end. If extraction reports a missing volume or checksum failure, obtain the missing or undamaged archive part; conversion software cannot reconstruct absent or corrupted data.