This is a simple code highlighter, where the output prepared for easy pasting into text processing software. The highlighter supports 292 different languages, and 44 different themes. List of known failures for highlighting can be found here, though most of these cases are obscure.

Source Code:
Language: ABAP ABNF ActionScript Ada Agda AL ANTLR4 Apache Configuration Apex APL AppleScript AQL Arduino ARFF ARM Assembly Arturo AsciiDoc 6502 Assembly Atmel AVR Assembly ASP.NET (C#) AutoHotkey AutoIt AviSynth Avro IDL AWK Bash BASIC Batch BBcode Bicep Birb Bison BNF Brainfuck BrightScript Bro BSL (1C:Enterprise) C CFScript ChaiScript CIL C-like Clojure CMake COBOL CoffeeScript Concurnas Cooklang Coq C++ Crystal C# Razor C# Content-Security-Policy CSS CSS Extras CSV CUE Cypher D Dart DataWeave DAX Dhall Diff Django/Jinja2 DNS zone file Docker DOT (Graphviz) EBNF EditorConfig Eiffel EJS Elixir Elm ERB Erlang Embedded Lua templating Excel Formula Factor False Firestore security rules Flow Fortran F# FreeMarker Template Language GAP (CAS) G-code GDScript GEDCOM gettext Gherkin Git GLSL GameMaker Language GN Go Go module Gradle GraphQL Groovy Haml Handlebars Haskell Haxe HCL HLSL Hoon HTTP Public-Key-Pins HTTP Strict-Transport-Security HTTP IchigoJam Icon ICU Message Format Idris Structured Text (IEC 61131-3) .ignore Inform 7 Ini Io J Java JavaDoc JavaDoc-like JavaScript Java stack trace Jexl Jolie JQ JS Extras JS Templates JSDoc JSON JSON5 JSONP JS stack trace React JSX Julia Keepalived Configure Keyman Kotlin KuMir (КуМир) Kusto LaTeX Latte Less LilyPond GNU Linker Script Liquid Lisp LiveScript LLVM IR Log file LOLCODE Lua Magma (CAS) Makefile Markdown Markup Markup templating Mata MATLAB MAXScript MEL Mermaid Mizar MongoDB Monkey MoonScript N1QL N4JS Nand To Tetris HDL Naninovel Script NASM NEON Nevod nginx Nim Nix NSIS Objective-C OCaml Odin OpenCL OpenQasm Oz PARI/GP Parser Pascal Pascaligo PC-Axis PeopleCode Perl PHP PHP Extras PHPDoc PlantUML PL/SQL PowerQuery PowerShell Processing Prolog PromQL .properties Protocol Buffers PATROL Scripting Language Pug Puppet Pure PureBasic PureScript Python Q (kdb+ database) QML Qore Q# R Racket Reason Regex Rego Ren'py ReScript reST (reStructuredText) Rip Roboconf Robot Framework Ruby Rust SAS Sass (Sass) Scala Scheme Sass (Scss) Shell session Smali Smalltalk Smarty SML Solidity (Ethereum) Solution file Soy (Closure Template) SPARQL Splunk SPL SQF: Status Quo Function (Arma 3) SQL Squirrel Stan Stata Ado Stylus SuperCollider Swift Systemd configuration file T4 Text Templates (C#) T4 templating T4 Text Templates (VB) TAP Tcl Textile TOML Tremor React TSX Template Toolkit 2 Turtle Twig TypeScript TypoScript UnrealScript UO Razor Script URI V Vala VB.Net Velocity Verilog VHDL vim Visual Basic WarpScript WebAssembly Web IDL WGSL Wiki markup Wolfram language Wren Xeora XML doc (.net) Xojo (REALbasic) XQuery YAML YANG Zig Line numbers: Starting line: Leadning Space Leading 0