This list needed rewriting. Two of the five tools it used to recommend are no longer the right answer, and the one most people should now reach for did not exist when it was written. Free bootable-USB software has quietly sorted itself out over the last few years: a handful of tools are actively maintained, they do genuinely different jobs, and picking the wrong one is why a drive boots on one machine and not another.
So this is not a ranking. It is five tools that still work in 2026, what each is actually for, and how to tell which one your particular ISO needs.
Installing Windows: Rufus, or Microsoft’s own Media Creation Tool if you would rather not use a third-party tool. Several ISOs on one stick: Ventoy. A Linux distro or a Raspberry Pi image: balenaEtcher. A live Linux drive that keeps your files between reboots: Universal USB Installer. All five are free.
What a bootable USB drive actually is
A bootable drive is not a drive with an ISO copied onto it. Your firmware has to find something it recognises before Windows or Linux exists to help — so the drive needs the right partition scheme, the right filesystem, and boot files written where the firmware looks for them.
That is three separate decisions, and they are where things go wrong. Modern PCs boot UEFI and expect a GPT drive formatted FAT32. Older machines boot legacy BIOS and expect MBR. FAT32 cannot hold a file bigger than 4 GB, and a modern Windows ISO contains one that is — which is precisely the problem these tools exist to solve.
Drag an ISO onto a USB stick and you have a USB stick with a file on it. Nothing has been written to the boot sector, and the firmware has no reason to look at the drive at all. Every tool below is doing the same underlying job: unpacking that image and laying it down in a form the firmware will start.
Three questions that pick the tool for you
Before comparing features, answer these. They narrow five options to one almost every time.
- What are you writing? A Windows installer and a Linux image need different handling, and not every tool does both.
- One image, or several? If you keep rebuilding the same stick, you want the tool that stops you rebuilding it.
- How old is the target PC? Anything from the last decade boots UEFI. Genuinely old hardware needs a legacy-BIOS layout.
1. Rufus — the default for Windows ISOs
Rufus is a 1.9 MB download that needs Windows 8 or later, is released under GPL v3, and comes in a portable build if you would rather not install anything. Version 4.15 landed on 30 June 2026. For writing a Windows installer it is the tool almost everyone should use: it picks sensible defaults for partition scheme and filesystem, and works around the 4 GB FAT32 limit without asking you to think about it.
The Windows User Experience dialog
When you write a Windows 11 ISO, Rufus offers a dialog it calls Windows User Experience, with tick boxes to remove the TPM 2.0 requirement, the Secure Boot requirement, the RAM minimum, and the mandatory Microsoft account at setup. For anyone with a working PC that Microsoft has declared unsupported, this is the reason Rufus gets recommended over everything else.
Worth understanding what it is doing. The Rufus project is clear that it did not invent these bypasses: they are mechanisms Microsoft added to the installer, which Rufus surfaces rather than reverse-engineers. It does not patch Windows binaries.
Because the bypasses are Microsoft’s own, Microsoft can remove them in a later build — and has. The Rufus FAQ carries an entry for exactly that situation. If you are planning an install on unsupported hardware, check the option is still there before you commit to the plan.
2. Ventoy — several ISOs on one stick
Ventoy works differently from everything else here, and once it clicks it is hard to go back. You install it to the drive once. After that you copy ISO files on by drag and drop, like ordinary files, and at boot Ventoy shows a menu of everything on the stick. No reformatting between images.
Version 1.1.17 arrived on 24 July 2026. It covers legacy BIOS plus IA32, x86_64 and ARM64 UEFI, handles ISOs larger than 4 GB, and lists over 1,400 tested images across Windows, WinPE, Linux, ChromeOS, Unix and VMware. The drive also stays usable as a normal USB stick, so the rest of its space is not wasted.
A single Ventoy stick holding a Windows installer, a Linux live image and a rescue tool covers most of what you would otherwise rebuild a drive for, twice a year, badly, under time pressure. If you fix other people’s computers, build this one first.
3. Microsoft Media Creation Tool — the official route
If you would rather not put a third-party tool anywhere near your install media, Microsoft publishes its own on the Windows 11 download page. There are three options there and they are easy to confuse: the Installation Assistant upgrades the PC you are sitting at, Create Windows 11 Installation Media writes a bootable USB, and the third simply downloads the ISO for you to write with something else.
The middle one is what you want for a clean install. Microsoft asks for a blank USB drive of 8 GB or more, an internet connection, a 64-bit x64 processor — not ARM — and a matching system language. The page currently serves the Windows 11 2025 Update, version 25H2.
Microsoft’s own note is blunt: any content on the flash drive will be deleted. This is true of every tool here, and it is the single most common way people lose files during an otherwise routine reinstall. Check the drive letter before you start, not after.
If the PC you are reinstalling still runs Windows 10, start here instead.
4. balenaEtcher — for disk images, not Windows
balenaEtcher is the friendliest tool on this list: pick an image, pick a drive, flash. It runs on Windows 10 and later, macOS 10.10 and later, and most Linux distributions, and it is free and open source. For a Raspberry Pi image or a Linux distro it is the shortest path from download to booting.
This is the mistake this article existed to prevent and never actually said. Balena’s own site puts it plainly: Windows images are “not bootable without extra treatment that etcher is not designed to do”. If you flash a Windows ISO with it, you will get a drive that either refuses to boot or reports a missing partition table. Use Rufus.
One footnote for older machines: if you are running Windows 7, Windows 8 or a 32-bit system, version 7.9.0 is the last release that will work for you.
5. Universal USB Installer — persistent Linux live drives
Universal USB Installer is the oldest name on this list and, unlike the two that dropped off it, still actively maintained — version 2.0.3.9 shipped on 26 July 2026. It runs on Windows 7 through 11 and writes Linux distributions, Windows installers, rescue tools and antivirus boot discs.
Its real speciality is persistence: a live Linux drive that remembers changes between reboots, with persistence files up to 40 GB using exFAT. If you want a Linux stick you can actually work from rather than just look at, this is the one. It handles both legacy BIOS and UEFI, and wants an 8 GB drive or larger.
The project warns that choosing Prepare this Device may wipe every volume and partition on the selected disk, including hidden ones. On a spare USB stick that is fine. Pointed at the wrong disk it is not, so confirm the target before clicking.
What happened to UNetbootin and RMPrepUSB
Both were in the previous version of this article, and neither belongs in it now.
UNetbootin is still there at version 702 and still works for what it was built for, which is Linux live USBs. But its own homepage says that ISO files for non-Linux operating systems use a different boot mechanism and should not be expected to work — and a Windows installer is what most people arriving here actually want. For Linux, Ventoy and Universal USB Installer both do more.
RMPrepUSB was a genuinely powerful tool for people who wanted to hand-tune a boot drive. It has gone quiet, and recommending an unmaintained utility that writes to partition tables is not a good trade for the small number of readers who would use its advanced features.
You might not need any of them
Windows can build a bootable installer on its own with DiskPart from Command Prompt. It is more steps and less forgiving, but it installs nothing, it works on a locked-down machine where you cannot run downloaded executables, and it is genuinely useful to understand once, because it makes the rest of this obvious.
The manual DiskPart route, step by step, if you would rather not install a tool.
Common mistakes to avoid
- Not checking the drive letter. Every tool here erases the target without a second prompt.
- Using Etcher for a Windows ISO. It is the single most common failure, and the error message does not explain itself.
- Assuming a drive is bootable because the files copied. Copying is not writing a boot sector.
- Formatting FAT32 by hand for a modern Windows ISO. The install file exceeds 4 GB and the copy will fail partway. Let the tool decide.
- Downloading from a mirror or aggregator site. Every tool here has its own page, and repackaged installers are a well-worn route for bundled adware.
Worth having something in place before you go downloading installers.
Where to download each one
Go to the source, not to a download portal:
- Rufus — rufus.ie
- Ventoy — ventoy.net
- Media Creation Tool — Microsoft’s Windows 11 download page
- balenaEtcher — etcher.balena.io
- Universal USB Installer — pendrivelinux.com
Bootable USB Frequently Asked Questions
Which tool should I use to install Windows 11?
Rufus if you want control or need the option to remove the TPM and Secure Boot requirements. Microsoft’s Media Creation Tool if you would rather stay entirely official. Both produce a working installer; Rufus gives you more choices along the way.
Can balenaEtcher make a Windows installation USB?
No. Balena states on its own site that Windows images are not bootable without extra treatment Etcher is not designed to do. Use Rufus, Ventoy or the Media Creation Tool instead.
Do I need to format the USB drive first?
No. Every tool here formats the drive itself as part of writing it, and that erases everything already on it. There is no benefit to formatting first and no way to keep existing files.
What size USB drive do I need?
Microsoft asks for 8 GB or more for Windows 11, and Universal USB Installer wants the same. A 16 GB drive gives you room to spare. For Ventoy it depends entirely on how many ISOs you plan to keep on it.
Is it safe to remove the Windows 11 requirements with Rufus?
Rufus is open source under GPL v3 and the options use mechanisms Microsoft itself put in the installer, rather than anything Rufus patched in. What is not guaranteed is that they keep working — Microsoft has removed them before, and the Rufus FAQ covers what to do when the option disappears. Going ahead on unsupported hardware is a decision worth making deliberately.
Picking one and getting on with it
For most people reading this the answer is Rufus, and it takes about four minutes. If you find yourself building install media more than twice a year, spend twenty minutes on Ventoy instead and stop rebuilding drives altogether.
The only step that really matters is the one before you click start: confirm which drive you are about to erase. Everything after that is the tool’s job.
