Download OllyDbg 64 bit for Windows 11, 10 PC. Free

OllyDbg Complete Download and Install Guide

Official Overview

OllyDbg is a 32-bit assembler level analysing debugger for Microsoft® Windows. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. OllyDbg is a shareware, but you can download and use it for free. Special highlights are:

Intuitive user interface, no cryptical commands

Code analysis – traces registers, recognizes procedures, loops, API calls, switches, tables, constants and strings

Directly loads and debugs DLLs

Object file scanning – locates routines from object files and libraries

Allows for user-defined labels, comments and function descriptions

Understands debugging information in Borland® format

Saves patches between sessions, writes them back to executable file and updates fixups

Open architecture – many third-party plugins are available

No installation – no trash in registry or system directories

Debugs multithread applications

Attaches to running programs

Other Features

• Configurable disassembler, supports both MASM and IDEAL formats
• MMX, 3DNow! and SSE data types and instructions, including Athlon extensions
• Full UNICODE support
• Dynamically recognizes ASCII and UNICODE strings – also in Delphi format!
• Recognizes complex code constructs, like call to jump to procedure
• Decodes calls to more than 1900 standard API and 400 C functions
• Gives context-sensitive help on API functions from external help file
• Sets conditional, logging, memory and hardware breakpoints
• Traces program execution, logs arguments of known functions
• Shows fixups
• Dynamically traces stack frames
• Searches for imprecise commands and masked binary sequences
• Searches whole allocated memory
• Finds references to constant or address range
• Examines and modifies memory, sets breakpoints and pauses program on-the-fly
• Assembles commands into the shortest binary form
• Starts from the floppy disk