Assembly File Viewer

Online NASM syntax highlighter for Assembly programming files

// Upload a .asm file to view its content here

Supported file type: .asm

Supported Assembly Syntax

x86/x64

NASM syntax

ARM

Basic support

MIPS

Basic support

Click the "Choose File" button above or drag and drop your Assembly file anywhere on this page.

Select your Assembly file (.asm, .s or .inc extension) from your computer.

View your low-level code with NASM syntax highlighting in the viewer above.

(Optional) Copy the highlighted assembly by selecting it and using Ctrl+C/Cmd+C.

Privacy Focused - Your assembly code never leaves your browser
NASM Syntax Highlighting - Clear visualization of instructions, registers, and directives
No Installation Needed - Works directly in your web browser with no setup
Multiple File Support - Works with .asm, .s, and include (.inc) files
Low-Level Development - Perfect for debugging and reviewing assembly code
Free Forever - No hidden costs or premium features

Is my assembly code uploaded to any server?

No, all processing happens in your browser. Your code never leaves your computer.
What assembly dialects are supported?

Primarily NASM syntax for x86/x64, with basic support for ARM and MIPS.
Can I execute my assembly code here?

No, this is a viewer only. To run assembly code you need an assembler like NASM and a linker.
Does this support macros and directives?

Yes, common NASM directives and macros are properly highlighted.
What about different register sets?

The syntax highlighting supports x86 general purpose, segment, control, and SIMD registers.