MP4Joiner vs Movavi Video Converter: Join Losslessly or Convert Freely?
MP4Joiner and Movavi Video Converter approach the same pile of clips from opposite directions. MP4Joiner refuses to re-encode: it stitches MP4 streams together exactly as they are, free. Movavi Video Converter re-encodes by design: it converts your clips into whatever format, resolution or device preset you choose — and can merge them into a single file along the way. Which approach is “better” depends entirely on whether your clips need changing, or just joining.
Affiliate disclosure: this page contains a sponsored link to Movavi. If you buy through it, this site may earn a commission at no extra cost to you. MP4Joiner is free and is linked without any affiliate arrangement. See our affiliate disclosure.
Side by side
| Dimension | MP4Joiner (MP4Tools 3.8) | Movavi Video Converter |
|---|---|---|
| Core idea | Lossless joining of MP4 files by direct stream copy | Fast format conversion, with an option to merge files into one output |
| Re-encoding | None by default (when clip parameters match); optional force re-encode for mismatched clips | Yes — conversion is the product. You pick format, resolution and quality |
| Input formats | MP4-family files (plus audio files for audio joining) | A wide range of video and audio formats |
| Editing | Simple cut only; no transitions, subtitles or filters | Basic trimming and adjustments inside the converter; full editing lives in Movavi’s separate editor products |
| Device presets | None — output is your clips, unchanged | Presets for phones, tablets, TVs and consoles, so you don’t have to think in codecs |
| Interface languages | Community translations in the open-source package | A polished interface in many languages, including Spanish and Russian — a real plus if English is not your working language |
| Platforms | Windows (32-bit installer) and macOS (Intel-era DMG); Linux from source | Windows and macOS |
| Price model | Free and open source (GNU GPL) | Paid software; see the official site for current pricing |
The honest trade-off
Choose MP4Joiner when the clips already agree with each other. Same camera, same settings, one continuous recording split into parts: re-encoding that footage would waste time and throw away quality for zero benefit. The direct copy is the technically correct operation, and it is free. Our joining guide walks through it, and the files are on the download page.
Choose Movavi Video Converter when the clips — or the destination — demand a change. A MOV from one device and an MP4 from another cannot be stream-copied together; a TV or an older phone may need a specific format; a 4K recording may need to become a shareable 1080p file. Conversion is exactly Movavi’s job, its presets spare you codec homework, and its localised interface (Spanish and Russian included) lowers the barrier further.
One caution that applies to every converter, Movavi included: joining by converting is still converting. If your only goal is to join identical clips, paying for a converter to re-encode them is buying a slower, lossier version of a free operation.
The verdict: two honest exits
Just joining MP4 clips? MP4Joiner does it losslessly and free. Download it here.
Converting while you join — formats, devices, resizing? Movavi Video Converter is built for that. See Movavi Video Converter (affiliate link).
Comparing the two paid toolboxes against each other? Read UniConverter vs Movavi, or browse the full best MP4 joiners roundup. Common questions are answered in the FAQ.