JavaStack.dev is your online toolbox for developers. Fast, free, and easy-to-use tools for your everyday coding needs.
Help developers save time and work smarter with lightweight, browser-based tools for testing, conversion, and data handling.
Test and debug regular expressions instantly. Highlight matches, spot errors, and speed up your development workflow.
Supports common regex syntax, live match preview, and error detection. Perfect for beginners and advanced developers alike.
Enter your regex pattern and instantly test it against sample text. Get live match highlighting and error detection to refine your expressions faster.
No installation needed. Works right in your browser.
Format, validate, and minify JSON data. Essential for APIs, configuration files, and testing web applications.
Quickly spot errors, reduce file size, and ensure your JSON is readable and compatible with any software.
Format, validate, and minify JSON instantly. Perfect for debugging API responses and cleaning up configuration files.
100% free and secure. Data stays in your browser.
Convert PNG images into scalable SVG graphics. Keep logos, icons, and graphics sharp on any screen resolution.
Works best for logos, icons, and line art. For photos or complex gradients, results may vary.
Upload a PNG and download a scalable SVG version in seconds. Keep logos, icons, and line art crisp on any screen size.
Fast conversion. No signup required.
Quickly create unique identifiers for database entries, sessions, or other coding purposes.
Each generated UUID is globally unique. Perfect for distributed systems, APIs, or anything that requires unique keys.
Click once to generate a globally unique identifier. Use it for databases, sessions, APIs, or distributed systems.
UUID v1 and v4 supported. Always unique.
Convert your Markdown (.md) files into HTML in just a few clicks. No coding required — simply upload your file and download the ready-to-use HTML.
Perfect for writers, developers, and teams who want quick publishing without manual formatting.
The generated HTML files are fully compatible with all browsers. You can open them directly, embed them in your website, or apply custom CSS for styling.
Ideal for blogs, documentation, reports, and online publishing workflows.
Our converter uses the CommonMark standard, ensuring consistent and accurate rendering of Markdown syntax into HTML.
This guarantees compatibility with popular platforms like GitHub, GitLab, and static site generators.
Upload your .md file and get a downloadable .html page instantly.
Fast, accurate, and ready for the web.
No signup required. 100% free to use.
Instantly generate a complete set of favicon icons for your website.
Upload a single PNG or JPEG, and download a ready-to-use favicons.zip.
Favicons are essential for branding and browser tabs. Our generator creates icons in multiple sizes, ensuring compatibility across all browsers, devices, and platforms.
Upload your logo once, and get favicons in .ico, .png, and other web-ready formats instantly.
Fast, free, and no signup required.
Add and manage multiple time zones to instantly compare current times across the world.
Selected time zones automatically show real-time updates with hours, minutes, and seconds.
Each time zone entry includes a Remove option, giving you full control of your list.
Find exact differences between two dates and times in years, months, days, hours, minutes, and seconds.
See differences in multiple formats — years, months, days, or total seconds — with copy buttons.
Clear your inputs instantly with the Reset button to start a fresh calculation.
Enter years, months, days, hours, minutes, and seconds to add to your base date and time.
Get precise results accounting for leap years, month lengths, and daylight savings.
One-click copy makes it easy to reuse calculated dates in projects, emails, or documents.
Learn how to use our tools effectively with tutorials. Found a bug or want a new feature? Submit an issue and help us improve.
Join our developer community, share tips, and get help. We value feedback and constantly update tools to meet your needs.