FastMinify

Free developer tools in your browser

Browser-based developer tools platform

FastMinify is a browser-based developer tools platform. Minify, convert, validate, encode and format code locally — JavaScript, CSS, JSON, HTML, XML, SVG, OpenAPI, Terraform, Docker, CI/CD configs and more. Everything runs in your browser; nothing is uploaded. Minification remains our foundation.

100% Free
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Pick your intent and try a tool

Minify, validate, convert, encode and more. Nothing is uploaded.

How it works

Pick a tool from the hub, paste your input and get a local result. No account, no upload.

Paste your input

Copy code, JSON, SVG, a config file or a token into the left editor.

Choose the tool and options

Open the right category from the hub (minify, convert, validate, encode or format) and adjust the options if needed.

Copy the local result

Processing stays in your browser. Download or copy the output.

Tool input stays in your browser. Nothing is uploaded for processing.

Local processingPrivacy policy

Developer tools in your browser

FastMinify is a developer tools platform that runs in your browser, with minification as its foundation. Explore the categories by intent: performance, formatting, conversion, encoding, JSON, SVG, DevOps, API schemas, CI/CD and utilities.

Browse all tools

Explore all tools

A developer toolbox that runs in your browser

Speed without the upload

Every tool runs in your browser. You can minify, convert, validate or encode without sending code to a server, and your payloads make no network round trip.

Performance and privacy together

Minification remains our foundation for lighter pages and better Core Web Vitals. The same privacy-first approach applies to converters, validators, SVG, DevOps and API tools.

JS and CSS minification example

Minification remains our foundation. It shrinks readable code for production.

JavaScript

Input:

function calculateTotal(items) {
    let total = 0;
    
    for (let i = 0; i < items.length; i++) {
        total += items[i].price * items[i].quantity;
    }
    
    return total;
}

function init() {
    calculateTotal();
}

Output:

function calculateTotal(t){let l=0;for(let n=0;n<t.length;n++)l+=t[n].price*t[n].quantity;return l}function init(){calculateTotal()}

CSS

Input:

.header {
    background-color: #ffffff;
    padding: 20px;
    margin-bottom: 10px;
    border-radius: 5px;
    color: #333333;
}

.header .title {
    font-size: 24px;
    font-weight: bold;
    color: #333333;
}

Output:

.header{background-color:#fff;padding:20px;margin-bottom:10px;border-radius:5px;color:#333}.header .title{font-size:24px;font-weight:700;color:#333}

Minification remains our foundation

FastMinify started as a minifier. Minify, beautify and unminify are still at its core, inside a broader toolbox that runs in your browser.

Minification removes unnecessary characters from JS, CSS, JSON and more without changing behavior. Use it for production builds. When the job is different, turn to the converters, validators, encoders, SVG, DevOps or utility tools. Everything stays in your browser.

Discover our approach

Lighter assets

Minification can reduce JavaScript and CSS file sizes, which can improve page load times, especially on mobile and slow connections.

Less data on the wire

Smaller files mean less transfer and lower bandwidth costs. On high-traffic sites, the savings add up.

Your code stays local

Nothing is uploaded. Paste, process and copy. That suits private configs, tokens you decode locally and production snippets you would not send to a SaaS tool.

Performance, SEO and local tooling

Browser-local tools help you ship faster pages and safer workflows. Minification is one Core Web Vitals lever among others.

Impact on sites and workflows

•Reduces page loading times
•Keeps sensitive snippets off remote servers
•Supports mobile and slow connections

What you can do here

•Minify JS, CSS, JSON, HTML, XML, SVG
•Convert and validate formats (JSON, YAML, OpenAPI…)
•Encode, hash and parse cron or UUID values locally
•Compatible with GZIP / CDN pipelines

Read our latest guides

Frequently Asked Questions

Common questions about FastMinify as a developer tools platform.

What is FastMinify?

FastMinify is a browser-based developer tools platform. Minification remains our foundation, alongside converters, validators, encoders, SVG, DevOps, API schemas and utilities. Everything is processed locally.

Is my data sent to a server?

No. Processing runs client-side in your browser. Your code and configs are not uploaded to FastMinify servers.

What kinds of tools are available?

Minify, beautify and unminify code, convert formats, and encode or decode text. You will also find tools for JSON, SVG, OpenAPI and JSON Schema. Others cover Terraform, Docker and .env files, CI/CD YAML, and utilities such as UUID, cron and regex. Browse them all from the tools hub.

Does minification break my code?

No. When the options are used correctly, minification changes only presentation (spaces, comments, variable names) and not behavior. Your code behaves the same after minifying.

Is it free? Do I need an account?

Yes. FastMinify is free and needs no registration, so you can use the tools as much as you need.

What is the difference between minify, beautify and unminify?

Minify compresses code for production. Beautify formats it for readability. Unminify restores line breaks in compressed code, though comments and original names are usually lost.

Still have questions? Contact us

Latest blog articles

Guides on developer tools, minification and web performance.

Subnet Calculator: Compute a CIDR, Summarize Ranges and Check an IP

Compute network, mask, host range and broadcast of a CIDR, summarize ranges into minimal blocks and check an IP, all in your browser. Nothing is uploaded.

11.10.202617 min read

NetworkingSubnetCIDR+2