Black Hole A2Z

Two builds, one purpose

There are two separate programs sharing a name. The Android build is the older of the two and does the jobs that are awkward on a phone. The Windows build is newer and does the jobs that are awkward in a browser. Neither is a port of the other, so they carry their own version numbers and their own release notes.

Both are free, neither has an account, and neither sends a record of what you did with it anywhere.

On Android

Black Hole A2Z is a media utility for a phone. It handles the ordinary jobs that are awkward on Android: saving a video into the gallery where other apps can find it, keeping a list of what you have saved, and joining separate picture and sound files into one playable video, which is how higher quality material often arrives.

Installing it on Android

1. Download the file using the Android button on this page.
2. Android will ask whether to allow installing from this source, because the file is not coming from an app store. That prompt is normal and you can revoke the permission afterwards.
3. Open the downloaded file and confirm the installation.
4. Later versions can be installed from within the app, which checks for updates itself.

Android requirements

• Android 7.0 or newer
• 64-bit ARM devices, which covers essentially every Android phone sold since 2017
• Around 21MB of storage for the app itself
• Space for whatever you save, which is usually the larger figure

On Windows

The desktop build is a small window with a box for a link. Paste one and it reads what is there first, showing the title, who uploaded it, how long it runs and which quality options genuinely exist for that particular item, before anything is downloaded. Choosing a quality from a list that was checked beats choosing from a list of guesses and finding out at the end.

It saves into a folder you pick, remembers that folder, and opens it when a file finishes. Progress is reported as real figures with a cancel that works, which matters more on a desktop where the files are larger.

Installing it on Windows

1. Download the installer using the Windows button on this page.
2. Windows will show a blue SmartScreen panel saying it protected your PC. This is expected and the next section explains exactly why.
3. Choose More info, then Run anyway, if you are satisfied the file is the one described here.
4. The installer lets you choose where the program goes rather than deciding for you.

About that SmartScreen warning

The installer is not code signed. A signing certificate is an annual cost paid to a certificate authority, and this is free software given away by one person, so it does not have one. Windows therefore cannot name a publisher and says so in the strongest terms it has.

That warning means the publisher is unverified. It does not mean anything was found in the file. The honest position is that you are being asked to trust the source rather than a certificate, so here is what you can check independently.

The published SHA-256 checksum of the installer is in the panel on this page. To confirm the file you downloaded is byte for byte the file described here, open PowerShell in your downloads folder and run Get-FileHash .\BlackHoleA2Z-Setup-1.1.0.exe. If the value it prints does not match, delete the file and do not run it.

You can also upload the installer to any public multi-engine scanner before running it. Both of those are worth doing for any unsigned software from anywhere, not just this one.

Windows requirements

• Windows 10 or Windows 11, 64-bit
• About 112MB to download, and roughly twice that once installed
• ffmpeg is optional. If it is already on the machine, the program can join separate picture and sound streams into one file and the full quality ladder is offered. If it is not, only the qualities that arrive as a single file are offered, which is a shorter list rather than a broken one.

What it is for

The same boundary applies to both builds as everywhere else on this site. They are for content you own, content in the public domain, and content you have permission to use. Neither circumvents digital rights management, paywalls, authentication or access controls, and neither is built to.

Privacy

There is no account and no sign-in on either build. The Android app keeps its list of saved files on the device and nowhere else. The Windows build keeps nothing but your chosen download folder, in a settings file on your own machine. There is no server holding a history of what anyone has done with either of them.

What they do not do

• There is no iPhone, iPad or macOS build.
• There is no Linux build.
• Neither circumvents protection measures or access controls.
• Neither can make content available that its source does not permit.