DevToolHub is a free, browser-based toolkit offering 25+ utilities for developers, designers, and engineers. Every tool runs entirely in your browser — no accounts, no installs, and no data sent to any server.
Essential developer utilities should be free, fast, and private. Too many tools require you to create an account just to format a JSON file, or upload sensitive documents to a cloud server just to merge two PDFs. Others offer a free tier that is limited enough to be frustrating, pushing you towards a paid plan for basic functionality.
DevToolHub exists to fix that. We build practical tools that work instantly, with zero friction. No paywalls, no accounts, no servers — just tools that do the job.
In an era of constant data breaches and privacy concerns, sending your private API keys, sensitive JSON payloads, or confidential PDFs to a random server is a massive security risk. We designed DevToolHub so you never have to make that compromise. Your browser does all the heavy lifting, meaning your workflow remains completely private.
DevToolHub is built using React and modern web standards. We leverage the power of the latest Web APIs—such as Web Workers for heavy computations, the Web Crypto API for secure hashing, and the HTML5 Canvas API for image processing. By offloading this work to the client, we ensure blazing-fast performance without the latency of server round-trips.
Our toolkit is organised into six categories that cover the most common day-to-day developer tasks:
JSON & Data Tools: Format, validate, and minify JSON and XML. Convert between JSON, CSV, and SQL. Generate typed classes from JSON schemas for TypeScript, C#, Java, and Python. Beautify SQL queries. Generate realistic mock data for testing.
PDF Tools: Merge multiple PDFs into a single document, split a PDF by page range, annotate and watermark PDFs, and convert PDFs to editable Word documents — all without uploading files to any server.
Image Tools: Convert between JPG, PNG, WebP, GIF, and BMP. Crop, resize, adjust brightness and contrast. Upscale and enhance images using AI. Convert colours between HEX, RGB, HSL, and HSV formats.
Security & Encoding: Encode and decode Base64, decode and inspect JWT tokens, generate MD5, SHA-1, SHA-256, and SHA-512 hashes, check password strength, and encode or decode URL query parameters.
Code Tools: Minify HTML, CSS, and JavaScript. Test regular expressions with real-time match highlighting. Convert Markdown to HTML with a live preview. Compare two code snippets or text files with a side-by-side diff.
Generators & Utilities: Generate cryptographically secure v4 UUIDs, Lorem Ipsum placeholder text, CSS linear and radial gradients, and convert times between any two IANA time zones.
Privacy First. All tools are client-side. Your data never leaves your browser. We do not upload your files to any server, and there are no analytics on your tool inputs or outputs. The architecture is designed so that we are technically incapable of seeing your data, not just promising that we won't look at it.
Always Free. Every tool on DevToolHub is and will always be free. No freemium model, no usage limits, no premium tiers. We are funded by non-intrusive display advertising, not by charging for features.
No Account Required. Open any tool and start working immediately. Zero registration, zero email verification, zero friction.
Built for Developers. We focus on tools that solve real, everyday problems — the kind of tasks that come up multiple times a week for working developers. Every tool is designed to be fast to reach and faster to use.
Continuously Improving. We actively maintain and improve existing tools and add new ones based on user feedback. If a tool is missing or could work better, we want to hear about it.
We build DevToolHub based on real developer feedback. If you have spotted a bug, want a new tool, or have a suggestion, email us at [email protected]. We aim to reply within 2 business days and read every message.