UUI - Universal USB Installer is a free, open source bootable USB creator for Windows and Linux that lets you build a Live USB drive from virtually any Linux distribution, Windows installer, antivirus rescue disk, or system utility ISO. With a simple three step process (select a distro, choose your ISO, pick your USB drive) you can have a bootable flash drive ready in minutes, no technical knowledge required.
Quick answer: Download UUI (or UUI Py for a native Linux/Windows version), run the executable (no installation needed), select your distribution and ISO file, choose your USB drive, and click Create. The tool handles formatting, bootloader setup, and file copying automatically. Optional persistence lets you save files and settings between reboots on supported Linux distributions, and UUI Py can even test boot the finished drive in a virtual machine without restarting your PC.
Universal USB Installer (UUI) | USB Boot Maker
UUI is ideal for anyone who wants to run Linux from a USB drive without touching their internal hard disk, test distros before committing to a full install, create a Windows installer USB, or build a portable system recovery toolkit. It supports both legacy BIOS and UEFI boot, and uses the Ventoy bootloader internally - enabling flexible multi-ISO compatibility and improved UEFI support without requiring repeated reformatting.
The tool is fully portable: no installation is required. Just run the executable from wherever you extracted it, including from another USB drive.
Top Features of Universal USB Installer (UUI)
- Extensive Linux Distribution Support: Create a bootable Linux USB drive for distros including Ubuntu, Fedora, Kali, Debian, Linux Mint, Arch, Manjaro, and hundreds more. Also supports multiboot ISO tools and system repair utilities.
- Simple Three-Step Interface: Even beginners can turn an ISO into a bootable USB drive in just minutes using UUI's straightforward selection process.
- Built in Download Links: The tool provides official download links for Linux ISOs, antivirus rescue disks, and utilities so you can get the files you need directly from trusted sources.
- Integrated USB Formatting: Includes a built-in formatting option using the FAT32 Formatter to prepare your drive to boot from USB, even if it is larger than 32 GB. exFAT is the default filesystem, so there's effectively no 4 GB file size limit in practice - individual ISOs can exceed 4 GB, limited only by the capacity of your drive.
- Persistent Storage Support: Enables Live USB persistence for supported distributions, letting you save files and settings between reboots - compatible with Ubuntu, Debian, Arch-based distros, and others. Supports up to 40 GB of persistence space.
- Windows USB Installer Capability: Use it to install Windows from USB - ideal for systems without a CD/DVD drive or for fresh installs of Windows 10 or 11.
- Boot Antivirus and Recovery Tools: Supports ISO files from Bitdefender, Kaspersky, AVG, and other system utilities for creating bootable system rescue USBs.
- Windows To Go Support: Create a portable Windows OS on a USB drive with full boot functionality - useful for technicians and mobile professionals.
- Drag N Drop ISO Support: Drop additional ISO, IMG, WIM, VHD(x), VDI.vtoy, or EFI files directly onto the UUI folder on your flash drive to add them without relaunching the tool. Boot menu entries populate automatically on the next startup.
- Secure Boot Support: Supported via the VTOYEFI option - enroll the included key in MokManager during startup to enable Secure Boot compatibility.
- Fully Portable Application: No installation required. Runs directly from any location, including from another USB drive.
UUI Py: The New Cross Platform Version
UUI Py is the newer, cross platform version of Universal USB Installer. Written in Python, it runs natively on both Windows and Linux - no WINE required - and adds several tools for creating, testing, and managing bootable USB drives that the classic version doesn't have.
One capability that sets UUI Py apart from other USB creation tools: it can detect and work with drives that were originally prepared by UUI, YUMI, or even standard Ventoy. That means you can add, remove, or manage ISOs on an existing multiboot drive without reformatting it or starting over, regardless of which tool built it in the first place.
What's New in UUI Py?
- Windows and Linux, natively: Runs on either platform without WINE or compatibility layers.
- Works with existing drives: Detects and manages USB drives prepared by UUI, YUMI, or standard Ventoy - not just drives it created itself.
- Automatic ISO downloads: Download supported distributions directly from within the application and directly to the drive.
- Batch mode: Add multiple ISO files to a USB drive in a single operation instead of one at a time.
- Built in VM test boot: Boot an ISO, or the entire prepared USB drive, inside a QEMU virtual machine to verify it works - without rebooting your computer.
- USB management: View everything currently installed on a drive, add more bootable items, and remove ones you no longer need.
UUI Py keeps the familiar three step workflow of the classic tool while adding this newer interface and expanded management features for both freshly created and pre-existing bootable USB drives.
UUI vs UUI Py
| Feature | Universal USB Installer | UUI Py |
|---|---|---|
| Platform | Windows (Linux via WINE) | Native Windows and Linux |
| Bootable USB Creation | Yes | Yes |
| Works With Drives From Other Tools | No | Yes (UUI, YUMI, standard Ventoy) |
| Batch-Add Multiple ISOs | One at a time (or drag-and-drop) | Yes, built-in batch mode |
| Built-in Test Boot (No Restart) | No (separate UUI-TestBoot.exe addon) | Yes, built in |
| USB Management (view/add/remove) | Limited | Yes |
| Persistence Tools | Supported for compatible distributions | Supported for compatible distributions |
| Portable Use | Yes | Yes |
For occasional use on Windows, the classic UUI still covers everything most people need. But UUI Py is worth considering if you work across both Windows and Linux, maintain a large or evolving collection of bootable ISOs, or want to test a drive actually boots before you rely on it - all from one application instead of several separate tools.
Test Boot Your USB Drive Without Rebooting
Restarting your PC just to check whether a freshly made drive boots correctly takes time, and if something's wrong you have to restart all over again to try something else. UUI Py's built-in test boot (also available as the standalone, portable UUI-TestBoot.exe addon for classic UUI drives) skips that step by booting your prepared drive, or a single ISO on it, inside a small virtual machine window on your current desktop.
It runs on QEMU or VirtualBox, and can stream the boot to a browser over your local network so someone else on the LAN can test it too. Whole-drive boot is detected as writable or read-only automatically, with nothing to configure.
Why UUI Py Is Worth Considering
UUI Py is especially useful for Linux enthusiasts, Windows technicians, developers, students, and anyone who maintains a portable USB toolkit across more than one operating system. Because it can read and manage drives originally built with UUI, YUMI, or Ventoy, it fits naturally alongside existing bootable USB collections rather than requiring you to rebuild them from scratch.
UUI Py stands alone because it combines almost every single bootable USB feature imaginable into one utility without compromising.
Why UUI Py Has No Rival
UUI Py stands alone because it combines almost every single bootable USB feature imaginable into one utility without compromising. It has no rival... except maybe YUMI Py. 🙂
All in One: It handles downloads, persistence, multi booting, and exFAT/NTFS formatting in one app.
No Compromises: Other tools force you to pick between easy multi booting or deep system configuration, but UUI Py does both.
Total Control: It gives advanced users the exact layout they want while staying simple enough for quick tasks.
Why Use UUI as Your Bootable USB Tool?
Whether you are a Linux enthusiast, IT technician, or first-time user, UUI is a strong choice when you need a reliable ISO-to-USB tool for Linux or Windows. It balances ease of use with genuine capability - supporting a wide range of ISOs, offering persistent storage, and using the Ventoy bootloader internally for better UEFI and multi ISO compatibility.
UUI has been actively maintained since 2008, predating Rufus, Ventoy, and YUMI, and was the first Windows based bootable USB tool to offer persistence. It remains one of the most downloaded tools in this category.
How to Use Universal USB Installer
Follow these steps to create a bootable USB flash drive using UUI:
- Download UUI: Visit the official download page and get the latest version, or grab UUI Py if you need native Linux support or built-in test booting.
- Launch the Tool: No installation needed - just double-click the executable.
- Select USB Drive: Choose your USB flash drive from the dropdown list.
- Select Distribution: Pick the Linux distro, Windows version, antivirus utility, or tool you want to make bootable.
- Browse for ISO: Select the ISO file from your local system, or use the built-in download link for the selected distro.
- Set Persistence (Optional): For Linux distributions that support it, use the slider to allocate space for saving files and settings between reboots.
- Click Create: Let the program build the bootable USB drive. A progress bar shows the status.
- Reboot and Boot from USB: Restart your PC and select the USB device as the boot source from your BIOS or boot menu (usually accessed with F12, F2, or Delete during startup) - or use UUI Py's built in test boot to check it first; USB boot without restarting.
Note: A USB drive of at least 8 GB is recommended for most modern Linux distributions. The drive will be completely wiped and formatted during the process, so back up any existing data first.
Universal USB Installer Specs and Download
- Author's Website: Make bootable USB drives with UUI
- Developer: Pendrive Linux
- First Release: 2008
- Current Version: Classic UUI 2.0.3.9 | UUI Py 1.0.0.1
- License: Open Source
- OS Compatibility: Classic UUI: Windows 11, 10, 8, 7 (Linux via WINE) | UUI Py: native Windows 10/11 and Linux
- Category: Bootable USB Software, Portable Utilities
- Download UUI Py: Download Universal USB Installer
Note: For creating a multiboot USB with multiple ISOs on a single drive, check out YUMI - Your Universal Multiboot Installer, which offers even more advanced USB boot capabilities including dynamic ISO management without rebuilding the drive.
USB Bootable Tool Comparison: UUI vs YUMI vs Rufus vs Ventoy
| Feature | UUI | YUMI | Rufus | Ventoy |
|---|---|---|---|---|
| Multiboot Support | Yes | Yes | No | Yes |
| Persistent Storage Support | Yes | Yes | Yes (limited to Debian/Ubuntu-based ISOs) | Yes (with plugin) |
| Supported ISO Types | Linux, Windows, Rescue Tools, IMG, WIM, VHD | Linux, Windows, Rescue Tools, IMG, WIM, VHD | Linux, Windows | Any bootable ISO/IMG (auto-detection) |
| Test Boot Without Restarting | Yes (via UUI Py or UUI-TestBoot addon) | No | No | No |
| Native Linux Support | Via WINE (UUI Py: native) | Via WINE | Via WINE | Yes |
| Secure Boot Support | Yes | Yes | Yes | Yes |
| Ease of Use | Beginner | Beginner to Intermediate | Intermediate | Beginner (drag and drop only) |
| Requires Rebuilding USB to Add ISOs? | No | No | Yes | No |
| Installation Needed | No | No | No | No |
| Open Source | Yes | Yes | Yes | Yes |
| Best Use Case | Live Linux USB, multiboot toolkit, persistent installs, cross platform | Multiboot USB with multiple tools, persistence, cross platform | Fast single ISO flashing for installs | Flexible ISO testing and multiboot |
Frequently Asked Questions
What is Universal USB Installer and what does it do?
Universal USB Installer (UUI) is a free, open source bootable USB creator. It supports Linux distributions, Windows installers, antivirus rescue tools, and system utilities. You select a distro, choose your ISO, pick your USB drive, and click Create. The tool handles formatting, bootloader setup, and file copying automatically.
What's the difference between classic UUI and UUI Py?
Classic UUI is the long-running Windows tool (also runnable on Linux via WINE). UUI Py is a newer, cross-platform rewrite that runs natively on both Windows and Linux, and adds batch ISO adding, built-in test booting in a virtual machine, and the ability to detect and manage drives originally prepared by UUI, YUMI, or standard Ventoy.
Does Universal USB Installer support UEFI and Secure Boot?
Yes. UUI uses the Ventoy bootloader internally, which provides UEFI and Secure Boot support. To enable Secure Boot compatibility, select the VTOYEFI option during startup and enroll the included key using MokManager.
Can I test whether my USB drive boots without restarting my computer?
Yes. UUI Py includes a built-in test boot feature, and classic UUI users can use the standalone UUI-TestBoot addon. Both boot your drive, or a single ISO on it, inside a QEMU or VirtualBox virtual machine on your current desktop - no restart or BIOS boot menu required.
What is Live USB persistence and which distros support it?
Persistence lets you save files, settings, and installed packages to your USB drive so they are available the next time you boot. UUI supports this for Arch, Fedora, Ubuntu, and Debian-based distributions, including Kali Linux. You can allocate up to 40 GB of persistence space.
Can I add multiple ISOs to one USB drive without reformatting?
Yes. With classic UUI, you can drag and drop additional ISO, IMG, WIM, VHD/VHDX, or EFI files onto the UUI folder on your flash drive. UUI Py adds a batch mode for adding several ISOs in one operation. Boot menu entries populate automatically on the next startup.
What USB drive size do I need?
A minimum of 4 GB is required for lightweight distributions, but 8 GB or more is recommended for most modern Linux ISOs. For multiboot setups or persistent installs, 16 GB or larger is ideal.
Does UUI work on Windows 11?
Yes. Classic UUI is compatible with Windows 11, 10, 8, and 7, and UUI Py runs natively on Windows 10 and 11 as well as Linux.
What is the difference between UUI and YUMI?
Both are developed by Pendrive Linux. UUI is focused on single-distro bootable USB creation with optional persistence, and supports multiboot via drag-and-drop with the Ventoy bootloader. YUMI is purpose-built for multiboot USB drives and offers more streamlined management of multiple ISOs, including a dedicated removal tool for each installed distro.
What is the difference between UUI and Rufus?
Rufus offers more control over partition scheme and filesystem options, making it well suited for Windows installers and users who need GPT/MBR flexibility. UUI supports a much wider range of Linux distributions natively, includes built-in download links, auto ISO downloading, supports persistence, and - through UUI Py - runs natively on Linux and can test boot a drive through qemu without restarting.
Can I use UUI to create a Windows 11 bootable USB?
Yes. UUI supports creating Windows 10 and Windows 11 installation USB drives, as well as Windows To Go drives for running Windows portably from the USB itself.
Is Universal USB Installer safe to use?
Yes. UUI has been downloaded millions of times and actively maintained since 2008. It's open source, and the full source code is published alongside each release for anyone to review.
Final Thoughts on Universal USB Installer
Universal USB Installer remains one of the most trusted and widely used bootable USB creators available. Its user-friendly interface, extensive distro support, persistent storage, Secure Boot compatibility, and no-install portability make it a go-to choice for Linux enthusiasts, IT professionals, and everyday users alike. UUI Py extends that further with native cross-platform support, batch ISO management, and the ability to test-boot a drive - or manage one built by UUI, YUMI, or Ventoy - without ever needing to rebuild it from scratch.
Whether you are setting up a Live Linux environment for testing, creating a Windows installer USB, building a portable system recovery toolkit, or running antivirus rescue tools, UUI handles the job reliably. For multiboot setups where you need to backup/restore or clone bootable USB drives, YUMI remains the stronger specialized option.
