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Sep 8, 2026
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FlashBoot Free is PrimeExpert's Windows tool for writing bootable USB drives, and it also installs a full copy of Windows onto a stick that boots on its own, images and clones USB drives, and formats sticks other tools cannot touch.
FlashBoot Free writes bootable USB sticks, and it does two jobs that most free tools in this category do not.
It comes from PrimeExpert Software, a small developer that has been shipping it since the Windows XP era.
The free edition is the one to plan around, because the paid edition cannot currently be bought.
ABOUT FLASHBOOT PRO
Both purchase links on the developer's own site lead to a page reading "FlashBoot Pro is currently unavailable for purchase". The Pro features are still listed in the program and on the vendor site, so you will see them, but there is no way to unlock them today. Treat the free edition as the whole product for now.
What You Get for Free
The free edition covers rather more than the name suggests, and the two entries at the top of this list are the interesting ones.
- A Windows installer stick. Turn a Windows Vista, 7, 8.x, 10 or 11 setup image into a USB drive that installs to an internal disk - the same job Rufus does.
- Windows running from the stick itself. Install a full Windows 8.x, 10 or 11 onto a USB drive that boots independently of the internal disk - the feature people usually pay for elsewhere, and the vendor confirms it is in the free edition.
- USB imaging. Save a whole USB drive to an image file, restore it later, or copy one stick to another with its bootability intact.
- DOS and UEFI shell. Both install to a stick in a couple of clicks, which matters if you are flashing firmware.
- Formatting and wiping. A quick format, or a secure wipe that erases everything on the drive.
The Windows-on-a-stick option wants a USB 3.0 drive of at least 16GB, and it accepts an ISO, an ESD file or a DVD as its source. On a USB 2.0 stick it will work and you will not enjoy it.
What It Does That Other Free Tools Do Not
This is the honest reason to pick FlashBoot over the obvious alternatives, and most of it only matters when something has gone wrong.
- FAT32 on drives over 32GB. Windows itself refuses this, and UEFI firmware often will not read NTFS, so a 64GB stick formatted the normal way can fail to boot at all.
- Sticks with no drive letter or no partitions. FlashBoot will still work with them, and it restores drives whose capacity another tool has shrunk - the classic 64GB stick that suddenly reports 32GB.
- ESD images. Not just ISO files and DVDs, which is useful because Microsoft's own downloads sometimes arrive in that format.
- Old machines and old Windows. It still runs on Windows XP, and can format a stick to boot in both USB-ZIP and USB-HDD mode for BIOS machines that are fussy about it.
- A command line. There is a CLI alongside the wizard, so the same jobs can be scripted or run unattended.
Worth knowing. FlashBoot does not talk to the internet at all - no update check, no telemetry, no account. Nothing is bundled in the installer either - it is bulkier than its rivals purely because everything it needs is carried inside it.
What Pro Would Add
Listed here because you will see these greyed out in the program and wonder, not as a recommendation - they are not on sale.
- Clones of your actual Windows installation, apps, settings and documents included, either bootable from the stick or installable onto another machine with different hardware.
- Driver integration for USB 3.x, NVMe and AHCI or RAID controllers, plus your own drivers - the thing that makes a Windows 7 installer work on a modern board.
- Privacy-hardened Windows 10 and 11 installs, blocking telemetry, updates, OneDrive and built-in advertising, with a local account instead of a Microsoft one.
- Windows XP and BartPE to USB, and self-extracting archives that format a stick and fill it in one step.
Who Should Look Elsewhere
FlashBoot is a wizard that does one job per run. If a row below describes you, the right column is quicker.
| If this is you | Use this instead |
|---|---|
| You just want a Windows or Linux installer stick | Rufus, which is tiny and needs no installation |
| You want several ISOs on one stick | Ventoy, or YUMI if you prefer a menu you build yourself |
| You need ISOs larger than 4GB on a multiboot stick | YUMI exFAT, which is built for exactly that |
| You want the Pro cloning features, today | WinToUSB for Windows-to-Go, or Clonezilla for whole-disk cloning |
| You are reinstalling Windows with no USB stick to hand | WinToHDD, which installs from an ISO on the disk |
| You are writing one .img or .iso and want it over with | balenaEtcher or X Drive Writer |
| You are installing to a room full of machines | iVentoy, which does it over the network instead |
If you want to write an image to several sticks at once, ImageUSB handles that, and the rest of the HDD, SSD and USB tools cover drive health and ISO mounting.
What You Need To Run It
It runs on Windows from XP through 11, including the Server editions, which is unusual - most tools in this category quietly require Windows 10 or later.
Our guide on creating a bootable USB recovery drive for Windows covers what to do with the stick once you have it, including the firmware settings that decide whether the machine boots from it.
One last thing, because it comes up with any tool that hands out paid features: FlashBoot Free is the real program, freely downloadable from the developer. Anything advertising a cracked Pro build is the usual trap, and our piece on what cracked software actually costs explains why.
Quick questions
Is FlashBoot Free really free?
Yes. No trial period, no nag screen, no bundled extras, and no account. The separate Pro edition costs money in principle but is not currently on sale.
Can I buy FlashBoot Pro?
Not at the moment. Both purchase links on the developer's site lead to a notice saying Pro is unavailable for purchase, so plan around the free edition.
Can it run Windows from the USB stick?
Yes, and in the free edition. Choose Full OS to USB, point it at a Windows 8.x, 10 or 11 image, and use a USB 3.0 drive of 16GB or more.
FlashBoot or Rufus?
Rufus for a plain installer stick - it is smaller and faster. FlashBoot when you want Windows running from the drive, USB imaging, or FAT32 on a stick larger than 32GB.
Why is the download so much larger than Rufus?
Everything it needs is inside the installer, including its own filesystem and image handling rather than calls to Windows components. That is also why it still works on Windows XP.
Will it work on a Mac or Linux?
No, it is a Windows program. For writing images on other platforms, balenaEtcher and Ventoy both run cross-platform.
Download FlashBoot Free 3.4b and see how it handles your drives, or tell us how you got on if you have used it before.
