FastMinify is a modern developer toolbox that helps you format, validate, minify, beautify and convert code directly in your browser.
From JSON, XML, YAML and CSV to JWT, Base64, UUID, hashing, regex, cron expressions and SVG optimization, FastMinify brings together hundreds of everyday developer utilities in one fast and privacy-first platform.
Everything runs locally in your browser whenever possible, ensuring your data stays on your device without unnecessary uploads or accounts.
I was looking for a side project to improve my skills with Next.js and Tailwind, and I noticed there wasn't really a minification tool with advanced options available. Most tools were either too basic or required you to upload your code to their servers.
I thought this could be useful for other developers, so I started building FastMinify.
What it does:
FastMinify is a free, privacy-first minification tool that runs entirely in your browser. It lets you minify, unminify, and beautify JavaScript, CSS, and JSON code with three compression levels (Conservative, Normal, Aggressive) and ES5 to ES2022 compatibility options.
You can also process multiple files at once - minify and concatenate them in batch with customizable settings. Everything runs client-side using Terser and CSSO, so your code never leaves your browser.
Perfect for developers who want fine-grained control over their minification process without compromising privacy.
Hope it can be helpful for your projects!
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Maker
Hey Product Hunt 👋
When I launched FastMinify nine months ago, it was a focused minification tool — JS, CSS, and JSON, running entirely in your browser with Terser and CSSO. No uploads, no server-side processing. Privacy-first by design.
A lot has changed since then.
FastMinify has grown into a privacy-first developer tools hub with 170+ tools — still 100% browser-local, still free, no signup required.
Beyond minify/beautify/unminify, you’ll now find:
Format & validate — JSON, XML, YAML, CSV, and more
Convert & encode — JWT, Base64, timestamps, data formats
The core idea hasn’t changed: paste your code, get instant results, nothing leaves your browser. But the scope is much broader — one place for the small tasks that interrupt your flow.
Available in English, French, and German.
I’d love your feedback: which tools are missing? What would make this your go-to dev toolbox?
Thanks for being here from the start 🙏
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Reviews
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Hey Product Hunt 👋
When I launched FastMinify nine months ago, it was a focused minification tool — JS, CSS, and JSON, running entirely in your browser with Terser and CSSO. No uploads, no server-side processing. Privacy-first by design.
A lot has changed since then.
FastMinify has grown into a privacy-first developer tools hub with 170+ tools — still 100% browser-local, still free, no signup required.
Beyond minify/beautify/unminify, you’ll now find:
Format & validate — JSON, XML, YAML, CSV, and more
Convert & encode — JWT, Base64, timestamps, data formats
DevOps & API utilities — Docker, Terraform, Kubernetes, OpenAPI, JSON Schema
Security & text tools — hashing, regex, cron, diff, UUID, passwords
SVG optimization and other everyday dev workflows
And many more !
The core idea hasn’t changed: paste your code, get instant results, nothing leaves your browser. But the scope is much broader — one place for the small tasks that interrupt your flow.
Available in English, French, and German.
I’d love your feedback: which tools are missing? What would make this your go-to dev toolbox?
Thanks for being here from the start 🙏