Free Online Developer Utilities

Free online developer tools that run 100% in your browser. Base64, JWT, JSON, UUID, cron, hash, password, OG preview, domain WHOIS, and more. No sign-up, client-side tools.

Features

• 20+ developer utilities in one place
• Most tools run in your browser. No uploads, no sign-up
• Dark and light themes, mobile responsive
• Nothing you enter is stored

Frequently Asked Questions

Are these developer tools really free?

Yes. Every tool is completely free with no account, no sign-up, and no premium tier. All processing happens locally in your browser.

Do these tools send my data to a server?

Most tools run entirely in your browser and never send what you enter anywhere. A few tools that fetch live public data (such as WHOIS, DNS, certificates, or news) route those specific requests through our server, because browsers block cross-origin calls. We relay the request and the response immediately and don’t store your data. The site also uses consent-based analytics and advertising cookies, which you can decline.

Which browsers are supported?

All modern browsers: the latest Chrome, Firefox, Safari, and Edge. Keep your browser updated for the best experience.