What you get for a .EFI file
We don't have a dedicated viewer for this format, so we identify and inspect it instead — honestly, only what can be read from the file.
Drop your .EFI file
Choose it or drag it in. It's read right here in your browser.
We identify it
We read the magic bytes to tell what the file really is, its MIME type, and whether the name matches the contents.
See the details
Any metadata we can extract (dimensions, EXIF/GPS, document author and dates), a hex view, plus readable text and strings found inside.
What is a .EFI file?
Plain text that programs, servers and people write every day.
An EFI file is an Extensible Firmware Interface file categorized as a system file. Developed by the UEFI Forum, these data files contain information used during the boot process. They are typically opened and managed using the EFI Developer Kit.
Programs that open .EFI files
| Full name | UEFI (EFI) Boot Application / Driver |
|---|---|
| Developer | UEFI Forum (specification); binaries built by OS/firmware/bootloader vendors |
| First released | EFI 1.0 (Intel, ~2000) → UEFI 2.x (UEFI Forum, 2005+); standard on PCs since ~2012 |
| Category | Text & Code |
| MIME type | application/efi |
| Signature | 4D 5A "MZ" - DOS/PE stub header |
Related viewers
Every viewer is free to use.
Frequently asked questions
Is my .EFI file uploaded anywhere?
No. The file is read and highlighted for you.
Why do some characters look wrong (é, ł)?
That usually means the file was saved in one encoding and opened in another. We detect UTF-8, UTF-16 and the Windows-1250/1252 code pages automatically and show which one was used.
Can it handle huge log files?
Yes, up to 50 MB. Only the lines on screen are drawn, so scrolling stays smooth. Syntax colours are switched off for files over 1.5 MB to keep things fast.
How do the log level filters work?
We find levels like ERROR, WARN, INFO and DEBUG on each line. Lines without a level, such as stack traces, stay with the entry above them, so filtering to errors keeps the full trace.
Can I edit the file?
This is a viewer. To change code, download it or copy it into your editor. Converting encodings and line endings is planned.
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