MP4Joiner FAQ — Frequently Asked Questions

Q: What is the latest version of MP4Joiner?

The latest version is MP4Tools 3.8, released on 20 November 2019. There has been no newer release since then — no 4.0 and no “2026 edition”, whatever other sites claim. Version 3.8 is stable and complete for its job, but it is an unmaintained release from 2019.

Q: Is there a 64-bit version of MP4Joiner?

No. There is no separate 64-bit build. The official Windows package, MP4Tools-3.8-win32.exe, is a 32-bit installer — and that is fine in practice, because a 32-bit program runs normally on 64-bit Windows through the built-in compatibility layer.

Q: Does MP4Joiner work on Mac?

Yes. The Mac download is a disk image, MP4Tools-3.8-MacOSX.dmg, for OS X 10.10 or later. The DMG is a 2019 Intel-era build, and native Apple Silicon support has never been officially verified by the developer — there is no Universal binary.

Q: Is there a portable version of MP4Joiner?

No. There is no official portable version. The official SourceForge release contains exactly three files — the Windows installer, the Mac DMG and the source package. The “Portable Application Description” (PAD) file on the official site is a description document, not a portable app.

Q: Is joining with MP4Joiner really lossless?

Yes — when your clips share the same encoding parameters (same codec, resolution, frame rate and audio settings). In that case MP4Joiner joins by direct stream copy: the existing streams are stitched into one file without decoding, so nothing is re-encoded and there is no quality loss. When clips have different parameters, a direct copy cannot work reliably, and MP4Joiner offers a force re-encoding option instead — that path does re-encode, so it is slower and no longer lossless.

Q: Is the MP4Joiner download safe?

The files we link to are the official releases hosted on SourceForge, the project's distribution channel, and our download page publishes the SHA-256 hash of each file so you can verify your copy byte for byte. In the 2.x era some users complained about bundled offers during installation — those complaints were about SourceForge's old installer wrapper of that period, not about the MP4Joiner program itself. The current official 3.8 package has been checked and contains no such bundling.

Q: Is this site the official MP4Joiner website?

No. mp4joiner.com is an independent resource site and is not affiliated with Alex Thüring, the developer of MP4Tools. The official website is mp4joiner.org, and the official files are distributed via the project's SourceForge page — which is exactly where our download links point.

Short, honest answers about MP4Joiner (part of the free MP4Tools suite by Alex Thüring): what it costs, what the latest version really is, which systems it runs on, when a join is truly lossless, and how to download it safely. Every answer on this page is based on the verified official release — MP4Tools 3.8.

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Is MP4Joiner free?

Yes. MP4Joiner is free, open-source software released under the GNU GPL. There is no paid version, no trial period and no watermark on joined files. It is one half of the MP4Tools suite by Alex Thüring — the installer gives you both MP4Joiner (merge) and MP4Splitter (split).

What is the latest version of MP4Joiner?

The latest version is MP4Tools 3.8, released on 20 November 2019. There has been no newer release since then — no 4.0 and no “2026 edition”, whatever other sites claim. Version 3.8 is stable and complete for its job, but you should know it is an unmaintained release from 2019. See the full version history.

Is there a 64-bit version of MP4Joiner?

No. There is no separate 64-bit build. The official Windows package, MP4Tools-3.8-win32.exe, is a 32-bit installer — and that is fine in practice, because a 32-bit program runs normally on 64-bit Windows through the built-in compatibility layer. Our dedicated page explains it in full: Is there a 64-bit version of MP4Joiner?

Does MP4Joiner work on Mac?

Yes. The Mac download is a disk image, MP4Tools-3.8-MacOSX.dmg, for OS X 10.10 or later. Be aware of one honest limit: the DMG is a 2019 Intel-era build, and native Apple Silicon support has never been officially verified by the developer — there is no Universal binary. Details and the download are on the Mac page.

Is there a portable version of MP4Joiner?

No. There is no official portable version. The official SourceForge release contains exactly three files — the Windows installer, the Mac DMG and the source package. The “Portable Application Description” (PAD) file on the official site is a description document, not a portable app. We explain the situation and your options in Is there a portable version of MP4Joiner?

Is joining with MP4Joiner really lossless?

Yes — when your clips share the same encoding parameters (same codec, resolution, frame rate and audio settings). In that case MP4Joiner joins by direct stream copy: the existing streams are stitched into one file without decoding, so nothing is re-encoded and there is no quality loss. When clips have different parameters, a direct copy cannot work reliably, and MP4Joiner offers a force re-encoding option instead — that path does re-encode, so it is slower and no longer lossless.

Which formats does MP4Joiner support?

MP4 is the tool’s format — joining MP4 files is what it is built for. MOV and M4V are not officially supported: some users have had occasional success with MOV files, but results are unreliable and not guaranteed, so convert those to MP4 first if a join fails. MKV, AVI and other formats are not supported either. One extra since version 3.1: the Joiner can also merge audio files.

What is MP4Splitter?

MP4Splitter is the other half of the MP4Tools suite, installed from the same package as MP4Joiner. Where the Joiner merges files, the Splitter cuts one MP4 file into parts — version 3.8 added an option to split only at keyframes. Read more on the MP4Splitter page and in the splitting tutorial.

Is the MP4Joiner download safe?

The files we link to are the official releases hosted on SourceForge, the project’s distribution channel, and our download page publishes the SHA-256 hash of each file so you can verify your copy byte for byte. One piece of history, stated plainly: in the 2.x era some users complained about bundled offers during installation — those complaints were about SourceForge’s old installer wrapper of that period, not about the MP4Joiner program itself. The current official 3.8 package has been checked and contains no such bundling.

Is this site the official MP4Joiner website?

No. mp4joiner.com is an independent resource site and is not affiliated with Alex Thüring, the developer of MP4Tools. The official website is mp4joiner.org, and the official files are distributed via the project’s SourceForge page — which is exactly where our download links point. We exist to document, explain and troubleshoot the tool honestly.

Why does Windows SmartScreen warn about the installer?

Because the MP4Tools installer is an unsigned open-source package. SmartScreen warns about programs that are not signed with a recognised publisher certificate, which is common for small free and open-source projects. The safe routine is: download from the official SourceForge channel, verify the file’s SHA-256 hash against the value on our download page, and only then proceed. Our SmartScreen guide walks through the warning step by step.

Still stuck? Work through the MP4Joiner not working guide, follow the main how to join MP4 files tutorial, or read more about this site.