Open EFI files in your browser
A program a computer's firmware runs before any system starts, like a boot loader. Open one right here to see what it is and who signed it for Secure Boot. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your app opens like a folder, its files listed on the left, with a page beside them on what it is, who signed it and what it asks for.
- Its signature • Checked inside your browser
- SHA-256 • Compare it or look it up on VirusTotal
- Heads-ups • What it asks for and what runs
- Its files • Manifests open as text
About EFI
An EFI file is a Portable Executable, the format of Windows programs, made for UEFI firmware: a boot loader like Windows Boot Manager, shim or GRUB, a driver, or a tool like a memory test. The firmware runs \EFI\BOOT\BOOTX64.EFI from a disk that has no boot entry of its own.
Secure Boot runs only programs signed with a certificate in the firmware's db. Most PCs carry Microsoft's: the Windows Production PCA 2011 and Windows UEFI CA 2023 for Windows, and the UEFI CA 2011 and 2023 for everything else, which is how Linux boots through shim.
Filepeek checks the Authenticode signature inside your browser against Microsoft's Secure Boot CAs and says which of them it chains to. It names the program's processor and kind, such as an application or a driver, and works out the SHA-256 to look up on VirusTotal.
UEFI program
.efi
Format
- MIME type
- application/efi
- Made by
- Intel and the UEFI Forum
- Released
- 2000
Inside the file
- Format
- Portable Executable (PE32+)
- Kinds
- Applications, boot drivers and runtime drivers
- Signature
- Authenticode, for Secure Boot
- Processors
- x64, ARM64, x86 and others
Opens in every browser
No browser opens an EFI: they download it. Filepeek opens it as a folder in Chrome, Edge, Firefox and Safari.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Questions
Will Secure Boot run this EFI file?
Filepeek checks its signature against Microsoft's Secure Boot CAs, which most PCs trust, and says which one it chains to. A computer whose firmware trusts other keys, or blocks this file's hash, may decide otherwise.
How do I see what an EFI file is?
Drop it on this page or choose Peek an EFI. A page shows what kind of UEFI program it is, its processor and who signed it.
How do I look up an EFI on VirusTotal?
Filepeek works out its SHA-256 inside your browser. Look up on VirusTotal opens VirusTotal's page for that hash, and only the hash goes, never the file. Compare checks it against a SHA-256, SHA-1 or MD5 you paste.
Does opening an EFI run it?
No. Filepeek only reads it: nothing in it runs and it never leaves your device.
Can I get files out of an EFI?
Yes. Pick any file on the left to open it. Its resources open at once. Export saves them all as a ZIP, or, in Chrome and Edge on a computer, extracts them into a folder.