You generally can’t convert.rbxl to .rbxlx without some Roblox- compatible parser or editor; the usual official route is to open the place in Roblox Studio and save it as .rbxlx, and Roblox forum posts also note there is no official API for direct conversion outside Studio.

What people typically do

  • Use Roblox Studio: open the .rbxl, then use File > Save As and choose .rbxlx.
  • Use a third-party CLI/library: some users mention tools like rbxmk , Rojo-related parsers , or other place-file libraries that can read a .rbxl and serialize it back to .rbxlx.
  • If you only need the content, not the file format: opening the place in Studio and re-saving is the safest path, because .rbxlx is the human-readable XML version and Roblox-specific tooling is what usually preserves everything correctly.

Important caveat

A plain file rename from .rbxl to .rbxlx usually does not perform a real conversion; the file still needs to be rewritten in XML form by compatible software. Forum replies also suggest that if your goal is just to edit or inspect the place, you may need a tool that understands Roblox place files rather than a generic converter.

Practical answer

If you must avoid Studio, your realistic options are:

  1. Use a Roblox file-format tool or library that can parse .rbxl and export .rbxlx.
  1. Use a third-party converter only if you trust it and it explicitly supports Roblox place files.
  1. Otherwise, Studio is still the standard way to do it.

TL;DR

There is no official one-click way to convert .rbxl to .rbxlx without Studio; outside Studio, you need a third-party tool that specifically supports Roblox place-file conversion.