ToHTML.com

These 92 languages I can recognise from your code alone. Paste them with Autodetect selected and you should not have to pick a type. It works from the first few lines, so the more code you paste the better the guess.

Everything else in the full list of 284 languages still highlights perfectly, you just have to choose it from the Type list. When auto-detect is unsure it falls back to C, so if you get C for something that is not C, pick the language by hand. It now tells you when that has happened, and offers to take a sample so I can teach it that language for next time.

Main languages (19)

C
C#
C++
D
Go
Groovy
IDL
Java
Kotlin
Pascal
Perl
Python
QML / Qt Quick
Ruby
Rust
Swift
Tcl/Tk (Tcl/Tk/Expect)
VB.NET
Visual Basic

Web (12)

ASP - JavaScript
ASP - PerlScript
ASP - VBScript
CSS
HTML
JavaScript (JScript)
PHP
Smarty (PHP Templates)
adp (AOLserver Dynamic Pages)
gsp (Groovy Server Pages)
parser
xbl (XML Binding Language)

XML family (12)

XHTML Frameset (XHTML 1.0 Frameset)
XHTML Strict (XHTML 1.0 Strict)
XHTML Transitional (XHTML 1.0 Transitional)
XML
XQuery (1.0)
XSLT 1.0
XSLT 2.0
docbook
mathml
rss
wsf (Windows Script File)
xmlcatalog

Databases (5)

Clipper
MySQL
SQL, PL/SQL
ibatis2-sql-map
ibatis2-sql-map-config

Assembly (2)

ASM (Assembler)
AVR asm (AVR Assembler)

Functional and logic (1)

Turbo Prolog

Hardware description (1)

Verilog HDL

Scripts, build and automation (16)

AWK
Apache Ant
Batch/Config.sys/NTcmd (Batch / NT Command Script)
CMake
Dockerfile
Java Compiler Compiler
Jenkinsfile
Log4j Configuration
Makefile
PowerShell
R
helm-text (Helm Charts)
helm-tpl (Helm Charts)
sh/ksh/bash script (Shell)
shell-bash (Shell Script)
shell-posix (Shell Script)

Config and INI (4)

Config, INI and CTL
INI File
Windows Registry
bootini

Legacy and mainframe (5)

COBOL free format
Cache/Open-M
Modula2 and Oberon2
PL1 (PL/I)
Rexx

Rare and exotic (8)

Dssp
FlexScript
Mako (Templates)
XSieve XSLT extension
ie.d (Infinity Engine: Dialogs)
mICQ Logs
postscript
ubasic (UniVision Basic)

Other formats (7)

Diff/Patch
Internet Email
JSON
YAML
ass (Advanced SubStation Alpha)
ddoc
yml (YAML)