Free Bootable USB Software

Choose Rufus for a dedicated installer or recovery image you plan to use on a known computer. Choose Ventoy when you want a menu of images on one drive and expect to change that collection regularly.

These are workflow differences, not speed rankings. The Rufus project documentation describes ISO and disk-image writing; Ventoy's official overview explains its image-file boot menu. Ventoy's getting-started instructions cover Windows and Linux preparation.

Use a dedicated drive and confirm its identity

Choose enough capacity for the operating system's stated media requirement, not just the downloaded file. For multiboot, allow room for all your images and future replacements.

Copy anything valuable off the USB and check that the backup opens. Before writing, compare the selected device's label and capacity with the physical drive. Disconnect other removable drives if they make identification ambiguous. Do not select an internal disk or your backup drive.

Rufus recreates the drive's partitions during media creation, as its FAQ explains. A normal Ventoy installation also formats the selected device. Treat both initial preparation paths as destructive, rather than assuming they preserve existing files.

Obtain the right ISO from its publisher

Download installation or recovery images from the operating system or tool developer. Check the edition, language, architecture and intended purpose: a live environment, recovery image and full installer are not interchangeable.

Where available, compare the image's SHA-256 checksum with the publisher's value. Microsoft's Windows download page provides a verification procedure. For Ubuntu, the official verification guide also covers authenticating the checksum file's signature. A checksum from an unrelated download site is not the same trust anchor.

Host architecture is not the image architecture

The host is the computer running the USB creator. The target is the computer that will boot from the USB. Choose the creator executable for the host, but the operating-system image for the target. Do not assume an x64 image suits an ARM64 machine because both are described as 64-bit.

The official Rufus downloads include different Windows executable architectures. That choice does not convert an image into another architecture. Ventoy's ARM64 documentation describes experimental, hardware-dependent support and states that Secure Boot is not supported on that route. Check the target's specific requirements before treating ARM64 media like a conventional x64 PC installer.

Understand GPT, MBR, UEFI and legacy BIOS

GPT and MBR describe partition tables; UEFI and legacy BIOS describe boot methods. They are related choices, not interchangeable names.

For Rufus's normal Windows installation workflow, the documented settings associate GPT with UEFI boot and MBR with BIOS or UEFI-CSM boot. Match the target computer's intended installation mode rather than choosing whichever setting sounds newer.

Ventoy is different: its MBR and GPT guide explains that MBR media can support both legacy BIOS and UEFI, although some UEFI firmware requires GPT. GPT may have compatibility issues with some legacy BIOS systems. There is no partition scheme that guarantees every computer will start.

These settings concern the USB. They are not instructions to convert or erase the target computer's internal disk.

Do not change the file system blindly

Large Windows installation files can exceed FAT32's individual-file limit. Rufus can use the UEFI:NTFS bootloader to boot NTFS media in UEFI mode; the project documents Microsoft-signed Secure Boot components. UEFI therefore does not universally require a FAT32-only USB. Follow the creator's image-aware choices instead of manually forcing FAT32 or NTFS without understanding the boot path.

Keep Secure Boot enabled when it is part of your target's security requirements. A security error deserves investigation, not an automatic recommendation to switch protection off.

Ventoy's Secure Boot instructions describe key enrollment that may be required on the first boot on a computer. Enrollment changes which boot software that computer trusts. On a managed device, ask its administrator before making that change.

There is a further distinction: Ventoy's Secure Boot policy documentation says its default policy allows EFI files to boot without signature checks. Booting Ventoy while the firmware's Secure Boot setting remains enabled does not therefore mean every selected image follows that firmware policy.

The documented policy-preserving mode uses VTOY_SECURE_BOOT_POLICY set to "1" in the global control plugin. It checks EFI files against the firmware policy and disables some Ventoy features. Review those instructions before relying on a multiboot drive in a Secure Boot environment. If enrollment or the required policy is unsuitable, choose another supported media-creation method rather than weakening the target's protection.

Neither creator makes unsupported Windows hardware supported. Check Microsoft's requirements and the device manufacturer's guidance separately from whether a USB can boot.

Rufus: write one selected image

Download Rufus from rufus.ie; its executable runs without installation. Then:

1. Confirm the intended USB in the device selector.
2. Select the verified ISO or supported disk image.
3. Review the partition scheme and target system against your earlier checks.
4. Read any image-specific choices and the erase warning before starting.
5. Wait for completion, inspect any reported error and safely eject the drive.

Do not assume writing a different image preserves the old media. Rufus is not a built-in multiboot manager; its FAQ points users wanting several boot images toward other solutions.

Ventoy: prepare once, then manage images

Follow Ventoy's installation instructions for your host. On Windows, extract the package, run Ventoy2Disk.exe, confirm the device and review partition and Secure Boot settings before choosing Install. Initial installation erases its existing contents.

After preparation, copy verified image files to the main data partition. Keep recognizable filenames so the boot menu is easy to navigate. Adding a replacement image does not require reinstalling Ventoy.

Distinguish Install from Update: Ventoy documents a separate update operation intended to retain the data partition's files. Keep backups anyway. Its MBR/GPT choice applies during installation, not during an update; do not expect Update to change the drive's partition scheme.

Before relying on the drive for a repair or reinstall, work through these checks:

1. Safely eject it after writing or copying. An apparently finished copy can still have pending writes.
2. For Ventoy, select an image in its boot menu and press m to calculate a checksum. Compare it with the publisher's value; the checksum documentation explains this check and safe removal.
3. Open the target's one-time boot menu using its manufacturer's instructions. Choose the intended UEFI or legacy entry, where both appear.
4. Confirm that the expected installer, recovery tool or live environment starts without an unexplained security warning.
5. Stop before installation, formatting or partition changes unless you intend them and have a separate backup of the target's data.

A matching hash checks the image's bytes; it does not prove hardware compatibility or a successful installation. If startup fails, record the exact error, then check image architecture, boot mode, checksum and the publisher's current compatibility guidance. Rewriting repeatedly with random settings makes the cause harder to isolate.

For applications that run inside an existing operating system, browse free portable software. That is a different use case from booting a computer from USB. More maintenance utilities are listed under freeware system tools.