Syntax highlighter Online

About Syntax highlighter

Adds syntax highlighting to a range of source code languages. Note that this will not indent the code. Use one of the 'Beautify' operations for that.

Input: text. Output: HTML with a sandboxed preview.

Format reference: Syntax highlighter background and specification

Example

Use “Try example” to load this public sample and its settings, then run it.

Settings used in this example

Parameter	Example value	Input and choices
Language	`javascript`	Text 194 Available choices auto detect 1c abnf accesslog actionscript ada angelscript apache applescript arcade arduino armasm xml asciidoc aspectj autohotkey autoit avrasm awk axapta bash basic bnf brainfuck c cal capnproto ceylon clean clojure clojure-repl cmake coffeescript coq cos cpp crmsh crystal csharp csp css d markdown dart delphi diff django dns dockerfile dos dsconfig dts dust ebnf elixir elm ruby erb erlang-repl erlang excel fix flix fortran freedesktop fsharp gams gauss gcode gherkin glsl gml go golo gradle graphql groovy haml handlebars haskell haxe hsp http hy inform7 ini irpf90 isbl java javascript jboss-cli json julia julia-repl kotlin lasso latex ldif leaf less lisp livecodeserver livescript llvm lsl lua makefile mathematica matlab maxima mel mercury mipsasm mizar perl mojolicious monkey moonscript n1ql nestedtext nginx nim nix node-repl nsis objectivec ocaml openscad oxygene parser3 pf pgsql php php-template plaintext pony powershell processing profile prolog properties protobuf puppet purebasic python python-repl q qml r reasonml rib roboconf routeros rsl ruleslanguage rust sas scala scheme scilab scss shell smali smalltalk sml sqf sql stan stata step21 stylus subunit swift taggerscript yaml tap tcl thrift tp twig typescript vala vbnet vbscript vbscript-html verilog vhdl vim wasm wren x86asm xl xquery zephir

Input

const answer = 42;

Result

The result is shown in the preview; download it to inspect the generated content.

Parameters

Parameter	Default value	Input and choices
Language	`auto detect`	Text 194 Available choices auto detect 1c abnf accesslog actionscript ada angelscript apache applescript arcade arduino armasm xml asciidoc aspectj autohotkey autoit avrasm awk axapta bash basic bnf brainfuck c cal capnproto ceylon clean clojure clojure-repl cmake coffeescript coq cos cpp crmsh crystal csharp csp css d markdown dart delphi diff django dns dockerfile dos dsconfig dts dust ebnf elixir elm ruby erb erlang-repl erlang excel fix flix fortran freedesktop fsharp gams gauss gcode gherkin glsl gml go golo gradle graphql groovy haml handlebars haskell haxe hsp http hy inform7 ini irpf90 isbl java javascript jboss-cli json julia julia-repl kotlin lasso latex ldif leaf less lisp livecodeserver livescript llvm lsl lua makefile mathematica matlab maxima mel mercury mipsasm mizar perl mojolicious monkey moonscript n1ql nestedtext nginx nim nix node-repl nsis objectivec ocaml openscad oxygene parser3 pf pgsql php php-template plaintext pony powershell processing profile prolog properties protobuf puppet purebasic python python-repl q qml r reasonml rib roboconf routeros rsl ruleslanguage rust sas scala scheme scilab scss shell smali smalltalk sml sqf sql stan stata step21 stylus subunit swift taggerscript yaml tap tcl thrift tp twig typescript vala vbnet vbscript vbscript-html verilog vhdl vim wasm wren x86asm xl xquery zephir

Before interpreting the result

Formatters change layout; minifiers reduce unnecessary formatting. Parsing requirements differ by language. Preserve original bytes when signatures or checksums depend on them.

How to use this page

Paste your input or open a local file.
Adjust tool options if needed, then choose Run tool.
Copy the result or download the original output bytes.

Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.

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