Built by a developer, for developers

About the author

Hi, I'm Pankaj Kumar, a Senior Software Engineer based in Bangalore, India. I work primarily with Blazor and the .NET ecosystem and have spent years building web applications and APIs. DevToolsHub started because I kept switching between browser tabs and slow, ad-heavy sites to do basic tasks — formatting a JSON response, decoding a JWT, generating a UUID. I built what I wanted to use every day.

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What is DevToolsHub?

DevToolsHub is a free collection of developer utilities available at www.devtoolshub.info. It covers the everyday tasks that interrupt your flow — formatting a JSON blob, decoding a JWT, generating a UUID, converting a timestamp, building a regex, extracting colours from an image — all in one place with no friction.

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Technical details

DevToolsHub is built entirely with ASP.NET Core 8 and Blazor Interactive Server, using MudBlazor for the component library and Serilog for structured logging. There is no database — all tool processing happens in your browser session using in-memory operations and browser APIs (Canvas, Clipboard, FileReader). Nothing you enter is stored anywhere.

The Monaco editor (the same editor that powers VS Code) is used for all code input and output panels. Static assets are served with Brotli and Gzip compression. The site runs on a cloud host behind Cloudflare.

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Why we built it

Most online developer tools come with unnecessary friction: sign-up walls, data retention policies, intrusive ads, or slow load times. DevToolsHub was built to remove all of that. The goal is simple:

• Open the tool, use it, and move on.
• Your input never leaves your session — nothing is stored or logged.
• No account is required, ever.
• Every tool works instantly in the browser.

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What tools are available?

DevToolsHub currently offers 40+ tools across the following categories:

• Formatting — JSON, YAML, HTML, SQL formatters and prettifiers
• Encoding & Decoding — Base64, URL, HTML entity, hash generation
• Conversion — CSV ↔ JSON, number base, timestamp, colour, SVG/PNG
• Generation — UUID, password, QR code, barcode, Lorem Ipsum, cron expressions
• Security & Auth — JWT decoder, JWT generator, JWT secret generator
• Image utilities — colour picker from image, image to Base64, SVG to PNG, PNG to SVG
• Text utilities — string escape, case converter, word counter, regex tester, diff
• Web utilities — URL parser, Unix permissions calculator, Markdown preview

New tools are added regularly based on what developers actually search for and use.

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Our principles

• Privacy first — no input is stored, logged, or shared.
• No accounts — every tool works immediately with no sign-up.
• Fast and clean — minimal UI, no unnecessary steps between you and the result.
• Free forever — all tools are and will remain free to use.
• Honest about ads — the site uses Google AdSense to cover hosting costs. Ad placements are non-intrusive and clearly disclosed in our Privacy Policy.

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Get in touch

Found a bug, have a tool request, or want to write for the blog? Email me at [email protected] or use one of the links below. I read every message.

Useful links