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LargeFileViewer — inspect huge files without loading them into memory

When working with large datasets, I often need a reliable large file viewer to dig through files—XML, JSON, CSV—that quickly grow into hundreds of megabytes or even gigabytes. At that scale, most tools start to fall apart. Editors freeze, search becomes unreliable, and some applications simply refuse to open a 1 GB file at all.

I’ve occasionally used LTFViewer.exe for this, which handles large files reasonably well. But I tend to prefer command-line tooling—especially for quick inspection, piping, and integration into workflows.

So instead of adapting my workflow to existing tools, I built a small one tailored to how I actually work.

LargeFileViewer is built on a different premise:

You don’t need the whole file. You only need what you’re looking at.