Tool comparison
HxD is a free hex and disk editor for Windows developed by Maël Hörz (mh-nexus). It opens files of virtually any size, plus raw disks and system RAM, and presents byte-level views with fast search, replace, export, and file comparison. In ECU tuning it is a staple for inspecting raw firmware reads, locating map or code regions by byte pattern, comparing an original dump against a modified one to confirm exactly which bytes changed, and applying manual patches. Built-in checksum and hash calculators, a data inspector, and fill/insert operations help verify edits and understand binary layout. Tuners reach for it alongside dedicated map editors whenever a change must be checked or performed by hand. It is lightweight, portable, and widely trusted in the community.
Notepad++ is a free, open-source source-code and text editor for Windows created by Don Ho, widely used for editing scripts, configuration files, logs, and CSV data. It is not a binary editor by default, but the popular HEX-Editor plugin adds a byte-level view so users can inspect and lightly patch binary files. In tuning workflows it is most useful for authoring and editing helper scripts, reading exported logs and reports, comparing text files with the Compare plugin, and, via the hex plugin, glancing at raw dumps. Its tabbed interface, syntax highlighting, regex search, and plugin ecosystem make it a convenient utility around a tuning toolchain, even though dedicated hex editors are better for serious firmware work.
HxD (Hex Editor / Reverse Engineering, mh-nexus (Maël Hörz)) and Notepad++ (Hex Editor / Reverse Engineering, Don Ho (open source)) compete in the same space, so the choice comes down to coverage, workflow and price for your specific ECUs. Free Windows hex and disk editor used to inspect and patch ECU firmware dumps Free Windows code editor with a hex-editor plugin for binary viewing
Whichever you flash with, Softechpro Solutions auto-applies DPF/EGR/AdBlue/DTC-off modules and Stage patterns with automatic checksum correction across ~1,400 firmwares on Windows & macOS — the fast way to get the actual file edits done.
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