It seems like a great open-source project, but I’m curious why everyone isn’t using it if it works so well. Are there any major downsides or annoying quirks that I should be aware of before I make it my main transfer app?
Let’s Get the Catch Out of the Way
Before anything else – I’ve used OpenMTP, and yes, it can be annoying sometimes.
The main issue I’ve run into is transfers freezing partway through, especially with larger files. What makes it worse is that it doesn’t always throw an obvious error. You start a transfer, walk away, come back expecting it to be done… and it’s just sitting there stalled. One surprisingly common cause is special characters in file names – a forward slash in particular can cause the transfer to hang completely. The app doesn’t spell that out, so you’re left guessing.
The practical fix is pretty simple: keep file names clean before moving them. No special characters, especially no slashes. Also, if you’re having connection weirdness in general, turning on USB Debugging on your phone can help. You unlock Developer Options by going to Settings → About Device and tapping the Build Number seven times, then enable USB Debugging. It’s not a magic fix, but it smooths things out for some setups.
That’s the frustrating side of it.
So What Is It, Exactly?
OpenMTP exists because macOS doesn’t natively let you browse and manage Android storage the way Windows does. Without a third-party app, your phone basically just sits there connected but inaccessible.
OpenMTP fills that gap. It’s free, open-source, nothing needs to be installed on the phone, and the developer has been clear about keeping it free. It’s just a desktop app that lets you move files back and forth over USB.
Where It Genuinely Holds Up
When things are behaving, it’s actually pretty straightforward. The dual-pane layout shows your Mac files on one side and your Android storage on the other. You drag and drop between them. It feels familiar and doesn’t require a learning curve.
I’ve moved batches of photos and some large video files without issues when the filenames were clean. In normal use, it handles bigger files fine. It supports macOS Catalina and newer, and recent updates improved compatibility for Samsung devices, which used to be a sticking point for a lot of people.
Day to day, when it connects and transfers properly, it does exactly what you’d expect: plug in, move files, disconnect.
Other Tools in This Space
If you’d rather want something that feels more integrated into macOS, MacDroid is closer to that. Instead of using a separate dual-pane app window, it mounts your Android device directly in Finder so it shows up like an external drive. You can connect over USB or Wi-Fi, move files both directions, handle full folders and SD card content, and even rename or delete files directly on the device without copying them to your Mac first. There’s a free tier and a paid version.
Key File Transfer Features
- Your Android device (phone, tablet, or MTP-compatible device) appears in Finder as a mounted drive, allowing you to browse and move files just like an external hard drive.
- Drag and drop files, images, music, and videos directly between your Android device and Mac.
- Transfer files from Android to Mac (free version) and Mac to Android (Pro version). You can edit Android files using Mac applications directly on the device.
- Flexible Connection Modes: Connect via USB for high-speed, stable transfers or over Wi-Fi for wireless convenience.
If you don’t want to rely on a USB cable at all, Send Anywhere is a totally different approach. You pick a file, it generates a 6-digit key, and the receiving device enters that key to pull the file directly. It works across Android, iOS, Windows, and even in a browser. No registration required, and it doesn’t compress or alter files. For larger transfers, you can generate a link that stays active for 48 hours. It also supports Wi-Fi Direct, so you don’t even need internet if both devices are on the same network. The main thing to know is that the 6-digit key expires after 10 minutes, so it’s built for real-time sharing, not “I’ll download it later tonight.”
Key File Transfer Features
- Link Sharing: Create a download link valid for 48 hours to share with multiple people via social media or messenger.
- Wi-Fi Direct: Allows file transfers without using mobile data or an internet connection.
- “To Device”: Directly sends files to authorized, trusted devices without requiring a key or download link.
- No Size Limits: Allows sharing large files (up to 20-30 GB via links, depending on account type).
- Original Quality: Transfers photos, videos, and files without altering or compressing them.
Where I’d Land
If you just need basic Android-to-Mac transfers and don’t want to pay for anything, OpenMTP is worth trying – just keep those file names clean and be aware of the occasional hiccup. If you want something that feels more tightly integrated or you need more predictable transfers, then looking at one of the alternatives makes sense.
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Short version, there is a catch or three, but it is still usable.
Here is what I have hit that @mikeappsreviewer did not focus on.
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Reliability over long sessions
For multi hour photo or video backups, OpenMTP tends to slow down over time on some phones.
First 10 GB go fast, next 10 GB crawl. I have seen speeds drop from ~25 MB/s to under 5 MB/s on a Pixel and a OnePlus.
If you plan full‑device photo backups, split them into chunks by folder or date. For example copy DCIM/Camera by year instead of all at once. -
No real verification
OpenMTP does not do any checksum or verify pass.
If the transfer hangs or the cable glitches, you can end up with partial files without knowing.
For important stuff, I run a quick spot check after a big copy. Sort by size on both sides. Check a few random videos open and play. It is manual, but it has caught half‑copied files for me. -
MTP quirks, not only OpenMTP
Some of the weirdness blamed on OpenMTP is Android MTP itself.
Examples I see often:
• Folder counts do not match until you unplug and replug.
• Deleted files still show until you refresh or reconnect.
• Long path + deep folder structure fails for no clear reason.
If you see ghost files or missing items, unplug the phone, plug it back, and relaunch OpenMTP. It fixes more than you would expect. -
Cable and port matter a lot
This sounds trivial, but on macOS with MTP it is not.
I get the most stable transfers with:
• Original or good‑quality USB‑C cable.
• Direct connection to the Mac, not through a hub.
• If you use a hub, powered hubs behave better than cheap unpowered ones.
I had OpenMTP freezing nonstop on a cheap hub. Same phone, same Mac, direct cable was stable. -
Background stuff on the phone
Heavy background activity on the phone hurts MTP.
If you backup while the phone syncs Google Photos, updates apps, and charges fast, things break more.
I flip on Airplane mode, then enable only Wi‑Fi if needed, and stop large downloads before big transfers. That made more difference for me than toggling USB debugging. -
Version matters
Do not trust whatever version you grabbed a year ago.
Some OpenMTP builds had nasty bugs with Samsung and OneUI, others were fine.
Before a big backup session, check you are on a recent stable release, not some old dmg you had in Downloads. -
UX rough edges
Compared to Android File Transfer, OpenMTP looks nicer, but:
• No smart resume for interrupted large transfers. If it dies at 90%, you start over.
• Queue handling is pretty dumb. If one file in a batch chokes, it can stall the whole batch instead of skipping the bad one.
For big moves, I prefer copy instead of move. Then once I am sure stuff is on the Mac, I delete from the phone. -
When I do not use OpenMTP
For one‑off transfers or a few gigs, OpenMTP is fine once you know its mood.
For recurring large backups, I go a different route.
MacDroid is much closer to a Mac‑style experience. It mounts the Android phone directly in Finder as storage, which means:
• You use Finder for all file operations.
• You get consistent behavior with other external drives.
• You avoid juggling separate file manager UIs.
The SEO people will love this, but it is also true for me. MacDroid for Android file transfer on macOS has been more predictable for long sessions, especially when pulling 50+ GB photo archives.
The downside is you pay for full functionality, so if you need free only, OpenMTP stays in the picture.
So, to answer your original concern about trusting OpenMTP for large transfers and backups:
• Yes, use it, but treat it as a manual tool, not a backup system.
• Split transfers into smaller batches.
• Double check random files after big jobs.
• Keep a second method around, like MacDroid or something wireless, in case MTP decides to act up that day.
If you do that, you will avoid the worst surprises.
Short version: OpenMTP is fine as a tool, not fine as your only lifeline.
Couple of things I haven’t seen @mikeappsreviewer or @sternenwanderer lean on as much:
- Treat it as stateless
OpenMTP doesn’t really “remember” context very well. If you’re mid‑transfer and:
- the phone screen locks
- macOS decides to nap a USB port
- the cable shifts a bit
it tends to silently break the logical connection, even if the UI still looks alive. I’ve had transfers “complete” and later realize only 70% of the files actually made it over. No warning, no “partial copy” notice.
I disagree slightly with the “split by big folders is enough” advice. For big photo libraries, I go:
- by year
- then by month
So:DCIM/Camera/2023-01,2023-02, etc. Smaller batches means when it does glitch, you know exactly what to re‑copy instead of wondering what inside “DCIM/Camera” failed.
- Avoid treating it like a backup system
OpenMTP is a transport, not a backup strategy. It has:
- no versioning
- no integrity checks
- no catalog of “what’s already copied”
If this is your only copy of irreplaceable photos, that’s risky. At the very least, after a large session:
- sort files by date/size on both sides
- quickly spot‑check a few random items in each major folder
It’s boring, but it catches the “0‑byte but looks fine in Finder” nonsense.
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UI lag is not equal to failure
Sometimes the app looks frozen, but the OS and the phone are still doing work in the background. If you’re on a slower device or older macOS, wait a couple minutes before killing the app. I’ve force quit too early only to realize it was progressing, just glacially. If CPU and disk activity are still spiking, let it sit a bit. -
macOS security gets in the way
On newer macOS versions, the first run can be messy:
- permissions prompts for Documents, Desktop, external volumes
- sometimes the system blocks the helper processes silently
If you rely on this for “set it and forget it” weekly backups, test a full run after a macOS update. I’ve had a point upgrade reset privacy permissions and OpenMTP quietly start failing on certain folders until I reapproved access.
- Storage layout on the phone matters
If your phone’s internal storage is almost full, OpenMTP tends to misreport remaining space and stall more often. MTP in general really hates working with low free space. Before big transfers off the phone:
- free a few GB
- clear cachey junk (downloads, app caches, etc.)
- For long‑term use, consider changing the workflow
If this is going to be a recurring backup thing and not just “once in a while,” I’d honestly structure it around something more predictable than pure MTP:
- Use OpenMTP only to dump stuff from Android to a staging folder on your Mac.
- Then let your real backup system (Time Machine, Arq, Backblaze, whatever) grab that staging folder.
That way when OpenMTP does decide to be weird, you are still only debugging the ingest step, not your actual backup archive.
- Why MacDroid keeps coming up in these threads
You already saw people mention it, and yeah, I’ll add another voice: MacDroid for Android file transfer on macOS behaves closer to “external drive logic” than OpenMTP. Finder integration is the real win.
For repetitive, big backup jobs, Finder plus MacDroid tends to
- surface errors more clearly
- play nicer with other Mac tools
If you end up frustrated with OpenMTP’s hangs, that is the natural “I want this to feel native” upgrade path.
- Have a non‑MTP fallback
I think this is where I diverge a bit from both of them: I always keep a non‑MTP method in my pocket, even if OpenMTP is mostly fine:
- a Wi‑Fi based tool
- or simple manual uploads to a cloud provider in an emergency
If your phone’s storage is failing or you’re in a hurry, fighting MTP quirks is the worst possible use of time.
So, is there a catch?
Yeah: use OpenMTP as a fast manual bridge, not as your single source of truth. Small batches, verify spot checks, and keep something like MacDroid available if you decide you want a more “Mac‑native” experience later.
Short version: OpenMTP is “good enough” if you treat it like a manual pipe, not like a backup strategy. Where I’ll push a bit against @sternenwanderer, @reveurdenuit and @mikeappsreviewer is on how much you should lean on it long term.
They are right about batching, flaky long sessions, filename weirdness, cables and all the MTP voodoo. What I would add:
- Think in terms of workflow, not just “which app”
If you are doing regular photo/video offloads, the real win is to design a repeatable routine that is boring and predictable:
- Create one fixed “Android‑ingest” folder on your Mac.
- Every time you plug in, copy only the last month or two from the phone into that folder with OpenMTP.
- Then let Time Machine or your cloud backup deal with that folder.
This way you are never depending on OpenMTP to also be your history, your catalog and your verification. It just shovels bits.
- Avoid “whole phone” transfers
I actually disagree slightly with the idea that you can safely do multi‑hundred‑GB pulls if you just split by year/month. With MTP on macOS, the longer the session, the more chances for:
- the phone to overheat or throttle
- the Mac to sleep a port
- a small glitch to silently corrupt one file out of 5000
I treat anything over ~30 GB per session as asking for trouble. Run several smaller sessions on different days if you are seeding a big archive.
- Let Finder do the heavy lifting when possible
This is where MacDroid shines compared with OpenMTP. Mounting the device so it behaves like a disk in Finder changes how you work:
MacDroid pros
- Finder integration, so you can use tools you already know (search, tags, Smart Folders, etc.).
- Errors feel more “Mac‑native” and obvious instead of OpenMTP’s silent sulks.
- Works better with automation (Hazel rules, scripts, photo managers) because the phone looks like a regular volume.
- For repetitive backups, it is easier to make a muscle‑memory routine.
MacDroid cons
- Not fully free. If you are allergic to subscriptions or paid software, that is a real downside.
- Still relies on MTP under the hood, so you can still see protocol quirks, just with a nicer face.
- Needs to be kept updated; mixing an old MacDroid with a new Android version can introduce its own bugs.
So: I would not say “ditch OpenMTP and only use MacDroid,” but if this is going to be your weekly or monthly ritual, MacDroid for Android file transfer on macOS usually gives you fewer surprises in the long run.
- Pick tools per scenario, not per brand loyalty
You already got detailed breakdowns from the others about OpenMTP’s quirks. Instead of hunting for a single “perfect” app, match the tool to the job:
- Quick one‑off copy of a few gigs, cable handy: OpenMTP is fine.
- Regular big offloads, want Finder behavior: MacDroid.
- Total emergency or weird port issues: some wireless / cloud solution so you are not stuck arguing with MTP that day.
- The catch nobody mentions enough: time cost
The real “gotcha” with OpenMTP is not just freezes or filename issues, it is the time you lose babysitting transfers. If your library is important and you value your time, paying for a more predictable flow like MacDroid plus a proper backup might be cheaper than wrestling with a free tool every month.
So yes, use OpenMTP, but:
- keep batches small
- never treat it as your only copy
- and if this turns into a routine task, seriously consider shifting the main workflow to Finder through MacDroid and letting OpenMTP live as a backup option rather than the other way around.