Free developer tools in your browser

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.

Why a browser-local developer toolbox?

Speed without the upload

Every tool runs in your browser — minify, convert, validate or encode without sending code to a server. Instant results, zero network round-trips for your payloads.

Performance and privacy together

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

Tools by category

Browse minify, beautify, unminify, converters, encoders, JSON utilities, SVG tools, DevOps & Infra and PHP serialization — same categories as the navigation menu.

Minify

Beautify

Unminify

JSON Tools

SVG Tools

DevOps & Infra

CI/CD

Format GitHub Actions

Validate GitHub Actions

Format GitLab CI

Validate GitLab CI

Logs & observability

Kubernetes

K8S

Format Kubernetes YAML

K8S

Validate Kubernetes YAML

K8S

Generate Kubernetes Ingress

K8S

Generate Kubernetes Deployment

API & schemas

JSON Schema to OpenAPI

Encoding

Developer utilities

Serialization

Developer tools in your browser

FastMinify is a browser-local developer tools platform — minify is our foundation. Explore categories by intent: performance, formatting, conversion, encoding, JSON, SVG, DevOps, API schemas, CI/CD and utilities.

Minify

Shrink code and assets for production — minify JavaScript, CSS, HTML, JSON and XML before gzip or CDN deploy.

Beautify

Make code readable with consistent indentation — beautify JavaScript, CSS, TypeScript, SCSS, LESS, Markdown, GraphQL, SQL, YAML and more in your browser.

Unminify

Expand minified or compressed code — unminify JavaScript, CSS, TypeScript, SCSS, LESS, SQL, YAML and other formats when debugging or reviewing.

Conversion

Transform data between JSON, YAML, XML and CSV locally — no server uploads.

JSON Tools

Validate, format, diff and explore JSON payloads — complementary to minifiers and converters.

SVG Tools

Preview, optimize with SVGO, export Data URI, resize, beautify, convert to JSX and validate SVG — all in your browser.

DevOps & Infra

Terraform HCL format/validate/minify, Dockerfile format & lint, Docker Compose and .env validation.

CI/CD

GitHub Actions and GitLab CI — format YAML and check workflow/job structure in your browser.

Logs & observability

Line-oriented JSON/NDJSON and Nginx/Apache access logs — format, filter, validate, and CSV/TSV.

Kubernetes

Multi-doc manifests, structural validate, Ingress/Deployment starters, and Helm values formatting.

API & schemas

OpenAPI tools to format, validate, and lint your specs.

Encoding

Encode or decode Base64, URL components and HTML entities — client-side only.

Developer utilities

Convert timestamps, generate UUIDs and passwords, test regex, slugify text, and convert number bases — all client-side.

Serialization

Serialize and deserialize PHP data structures beside JSON workflows.

Explore all tools →

How does it work?

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 intent from the hub — minify, convert, validate, encode, format — and adjust options if needed.

Copy the local result

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

Example: JS & CSS minification

Minification remains our foundation — here is how 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 — and minify, beautify and unminify still power lighter production assets. That foundation sits inside a broader browser-local toolbox.

Minification removes unnecessary characters from JS, CSS, JSON and more without changing behavior — often 30–70% smaller files and better load times. Use it for production builds, then reach for convert, validate, encode, SVG, DevOps or utilities when the job is different. Everything stays in your browser.

Discover our approach →

Foundation: lighter assets

Minification can reduce JavaScript and CSS file sizes by 30-70%, improving page load times — especially on mobile and slow connections.

Less data on the wire

Smaller files mean less transfer and lower bandwidth costs. For high-traffic sites, that compounds into real hosting savings.

Your code stays local

Nothing is uploaded. Paste, process and copy — ideal for private configs, tokens you are decoding locally, or 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 remains a Core Web Vitals lever among others.

Impact on sites and workflows

•Improves Google's Core Web Vitals via lighter assets
•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, parse cron / UUID — 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 — all 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; format converters; encode/decode; JSON tools; SVG; Terraform/Docker/.env; OpenAPI and JSON Schema; CI/CD YAML; plus utilities like UUID, cron and regex — browse them from the tools hub.

Does minification break my code?

No. Minification only changes presentation (spaces, comments, variable names) without altering functionality when options are used correctly. Your code behaves the same after minify.

Is it free? Do I need an account?

Yes — FastMinify is free and requires no registration. Use the tools as much as you need.

What is the difference between minify, beautify and unminify?

Minify compresses for production. Beautify formats for readability. Unminify restores line breaks on compressed code (comments and original names are usually lost).

Still have questions? Contact us →

Latest blog articles

Guides on developer tools, minification and web performance.

Terraform and HCL: Format, Validate and Minify Files Online

Format and validate HCL/Terraform before `terraform plan`. Browser-based tools, IaC best practices and common pitfalls.

Minification for WordPress: Plugins, Configuration and Best Practices

Optimize your WordPress site with JavaScript, CSS and HTML minification. Plugin comparison, configuration and tips for an ultra-fast WordPress.

Automate Minification in Your CI/CD Pipelines (GitHub Actions, GitLab CI)

Learn how to integrate JavaScript and CSS minification into your CI/CD pipelines. Concrete examples with GitHub Actions and GitLab CI for optimized deployments.

Free developer tools in your browser

Why a browser-local developer toolbox?

Speed without the upload

Performance and privacy together

Tools by category

Minify

Beautify

Unminify

Conversion

JSON

YAML

XML

CSV

TOML

TSV

SQL

HTML

Markdown

Properties

INI

JSON Tools

SVG Tools

DevOps & Infra

CI/CD

Logs & observability

Kubernetes

API & schemas

Encoding

Developer utilities

Serialization

Developer tools in your browser

Minify

Beautify

Unminify

Conversion

JSON Tools

SVG Tools

DevOps & Infra

CI/CD

Logs & observability

Kubernetes

API & schemas

Encoding

Developer utilities

Serialization

How does it work?

Paste your input

Choose the tool and options

Copy the local result

Example: JS & CSS minification

JavaScript

Input:

Output:

CSS

Input:

Output:

Minification remains our foundation

Foundation: lighter assets

Less data on the wire

Your code stays local

Performance, SEO and local tooling

Impact on sites and workflows

What you can do here

Frequently Asked Questions

What is FastMinify?

Is my data sent to a server?

What kinds of tools are available?

Does minification break my code?

Is it free? Do I need an account?

What is the difference between minify, beautify and unminify?

Latest blog articles

Terraform and HCL: Format, Validate and Minify Files Online

Minification for WordPress: Plugins, Configuration and Best Practices

Automate Minification in Your CI/CD Pipelines (GitHub Actions, GitLab CI)