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Go Formatter

Run gofmt itself — the formatter from the Go toolchain, compiled to WebAssembly — in your browser. The output is canonical gofmt style, tabs and all, and there is deliberately nothing to configure.

Programming Language Tools

How to use Go Formatter

  1. Paste Go source into the input panel.
  2. Press Format. gofmt loads on first use, then runs instantly.
  3. Copy the result or download it as formatted.go.
  4. A syntax error is reported with gofmt's own message and position.

Examples

Before

Valid Go, but not gofmt'd.

package main
import ("fmt"
"strings")
func main(){
fmt.Println(strings.ToUpper("hi"))}

After

Canonical gofmt output, with tab indentation.

package main

import (
	"fmt"
	"strings"
)

func main() {
	fmt.Println(strings.ToUpper("hi"))
}

Features

  • Genuinely gofmt: the Go toolchain's formatter compiled to WebAssembly
  • Canonical Go style — no options, by design
  • Aligns struct fields, const blocks and comments the way the toolchain does
  • Groups and formats import blocks
  • Reports syntax errors with gofmt's own message
  • Copy to clipboard or download formatted.go
  • Only 260 KB, downloaded when you press Format
  • Runs entirely in your browser

Frequently asked questions

Is this really gofmt?
Yes. It is the gofmt implementation from the Go project compiled to WebAssembly, so the output is byte-identical to running gofmt locally.
Why are there no indentation options?
Because gofmt has none. Go deliberately has one canonical format, which is why Go code looks the same everywhere. Offering spaces here would produce output that is not gofmt'd.
Does it run goimports as well?
No. gofmt formats existing imports but does not add or remove them; goimports is a separate tool that needs to resolve packages, which is not possible in a browser.
Will it fix my syntax errors?
No. gofmt must parse the file first, so a syntax error stops it and the error message tells you where.
Does it work on a fragment?
gofmt expects a complete file, starting with a package clause. A bare function body will be rejected as a parse error.
Is my code uploaded?
No. The WebAssembly module runs locally and nothing leaves your browser.

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About Go Formatter

Go Formatter is part of Programming Language Tools on ToolHive, a growing collection of small, focused utilities for developers, designers and students. Formatters and playgrounds for Python, C, Java, Go, Rust and SQL. Everything runs client-side, so your data never leaves the browser tab — which makes these tools safe to use with work-in-progress code and private content.