What’s in the file
A .bin is raw bytes and nothing else: no addresses, no labels, no file header saying what it is. Tuners often call an untouched read .ori and a changed one .mod, but inside they’re the same kind of file.
Reading tools sometimes save the same memory as .hex or .s19 instead. Those are text formats where every line carries an address, the data and a checksum (Intel HEX, Motorola S-record). They hold the same program, just packed differently. A .zip from a forum or a tuner usually has one of these inside.
1. In your browser, on EcuInside
Drop the file on the home page. Nothing to install, and it works with .bin, .ori, .hex, .s19 or a .zip with one file inside. You get:
- the ECU maker, family and variant, and the numbers written inside, each with the bytes it came from;
- whether the size looks like a whole read or only part of the memory;
- a map of the whole file, and its hex;
- the tables we can find by their shape, with their axes and values, as a grid or a 3D surface.
The file is read in memory and not kept. One limit: we find tables by shape, so we can’t tell you what a table does. A name only shows when a tuner has checked it for that exact software.
2. A hex editor
A free hex editor such as HxD on Windows shows every byte of the file with its address. That’s enough to find a number at a known address or to compare a few bytes by eye. It won’t find tables or tell you what anything is.
3. TunerPro
TunerPro is free and fully featured without registering (TunerPro). It runs on Windows. To show tables by name it needs a definition file, an XDF, written for your exact software, and a definition for a different version can show the wrong data (HP Academy). Most definitions are made by the community. Without one you’re back to looking at hex.
4. The WinOLS demo
WinOLS, from EVC, is the editor many professional tuners use, and a licence costs €1,034.11 on EVC’s price list (EVC). EVC also offers a free demo for Windows (EVC downloads). It’s cut down, but enough to open a file and look around (HP Academy). If you only want to look, see our list of free WinOLS alternatives.
Got a Haltech, Link or MaxxECU file instead?
Those are map files from aftermarket ECUs, not reads of a factory one, and the tools above won’t make sense of them. ECU Recovery’s free map viewer opens them.
What none of these can do without a definition
A factory file doesn’t say what its tables control. Names, units and limits live in the maker’s own description files, known as DAMOS or A2L, or in definitions people write for each software version. Without one, any viewer can show you shapes and numbers but not what they mean. We don’t host DAMOS or A2L files, and we don’t guess names.
The quickest look: drop the file on EcuInside. You see what it is, its numbers and its tables in a few seconds, and nothing is kept.