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100% free · no signupRuns in your browser

Source Code Beautifier

Auto-indent source code with brace-aware formatting.

Best for: Use it to inspect minified code, tidy a snippet, or prepare code for a review.

Complete guide

Input

How it's calculated & sources
The Source Code Beautifier uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

Continue your journey

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Source Code Beautifier?
A source code beautifier reformats minified or messy code (HTML, CSS, JS and more) into clean, indented, readable form.
Why does Source Code Beautifier matter?
The same code, readable again. Formatting is cosmetic - it doesn't change what the code does.
How is Source Code Beautifier calculated?
It re-indents and spaces the code consistently while preserving behaviour, in your browser.
What are common source code beautifier mistakes?
Expecting it to un-minify variable names - those are lost in minification.
When should you use the Source Code Beautifier?
Use it to inspect minified code, tidy a snippet, or prepare code for a review.

What is the Source Code Beautifier?

A source code beautifier reformats minified or messy code (HTML, CSS, JS and more) into clean, indented, readable form.

How the Source Code Beautifier works

It re-indents and spaces the code consistently while preserving behaviour, in your browser.

Common mistakes to avoid

  • Expecting it to un-minify variable names - those are lost in minification.
  • Reformatting a language the tool doesn't fully support.
  • Assuming beautifying changes performance.

Keywords: beautify, format, code.

Runs entirely in your browser - your data is not uploaded.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Source Code Beautifier free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Source Code Beautifier?+

Source Code Beautifier uses the standard source code beautifier formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Source Code Beautifier runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Source Code Beautifier on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Based on this tool, your recent activity and how others chain tools together.

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Share & publish

Share & challenge

Twitter Facebook LinkedIn WhatsApp
Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free source code beautifier — instant, no signup

Body: Auto-indent source code with brace-aware formatting. Try it: https://freetoolsgalaxy.com/tools/source-code-beautifier
LinkedIn post
Source Code Beautifier on Free Tools Galaxy — Auto-indent source code with brace-aware formatting. https://freetoolsgalaxy.com/tools/source-code-beautifier
Medium intro
# Source Code Beautifier — the free tool I keep coming back to

Auto-indent source code with brace-aware formatting.

Try it: https://freetoolsgalaxy.com/tools/source-code-beautifier
Quora answer
The fastest way is to use a free in-browser source code beautifier: https://freetoolsgalaxy.com/tools/source-code-beautifier. Auto-indent source code with brace-aware formatting.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/source-code-beautifier?embed=1" title="Source Code Beautifier" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/source-code-beautifier" target="_blank" rel="noopener">Powered by Source Code Beautifier on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/source-code-beautifier?embed=1" title="Source Code Beautifier" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[Source Code Beautifier — free online tool](https://freetoolsgalaxy.com/tools/source-code-beautifier)

<iframe src="https://freetoolsgalaxy.com/tools/source-code-beautifier?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/source-code-beautifier" target="_blank" rel="noopener">Try the free Source Code Beautifier</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free pregnancy due date calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick pregnancy due date calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard pregnancy due date use cases (pregnancy, due, date, baby) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/pregnancy-due-date-calculator

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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