1. About Arnab
Arnab Biswas is a self-taught developer, co-founder, and Lead Developer at Merge PDF. He is responsible for the technical development and ongoing maintenance of the platform, working primarily with HTML, CSS, and modern JavaScript to build browser-based PDF utilities.
Alongside technical development, Arnab leads SEO strategy and content quality across the site. His responsibilities include conducting SEO content audits, reviewing technical articles for accuracy and usefulness, and overseeing search optimization.
He also systematically tests PDF functionality across documents with different file sizes and page counts, including rigorous large-document test cases of 500 and 1,000 pages.
2. Technical Responsibilities
- Frontend Engineering: Architecting and maintaining clean, accessible web interfaces using standard semantic HTML5, CSS3, and modern vanilla ES6+ JavaScript modules without bloated frameworks.
- Browser-Based PDF Functionality: Implementing client-side document processing where operations execute directly in the user's browser, preventing document bytes from being uploaded to remote processing servers.
- Cross-Device Maintenance: Ensuring consistent performance, touch target accessibility, and responsive rendering across desktop, tablet, and mobile browsers.
- Technical Quality Assurance: Profiling browser memory allocation, canvas rendering performance, and binary stream export.
3. SEO & Editorial Responsibilities
- SEO Strategy: Developing search architecture, internal linking structures, crawlability protocols, and structured data schemas.
- Content Audits: Conducting regular audits of tool guides and informational pages to eliminate fluff, verify technical accuracy, and uphold helpful content standards.
- Article Review for Accuracy & Usefulness: Reviewing documentation and informational articles before publication to verify that procedural instructions and architectural explanations align with the real codebase.
- Editorial Disclosure: Reviewing an article verifies its technical accuracy, but does not imply Arnab is the sole author of every piece of content published on the site.
4. Testing Approach
Arnab approaches testing through structured, feature-level verification. Rather than assuming that client-side code will run identically on every PDF, he tests individual operations with diverse test documents:
- Small documents (1–10 pages) for immediate latency and canvas rendering fidelity.
- Multi-megabyte files containing complex embedded images and vectors.
- High-volume stress test documents with 500 and 1,000 pages to evaluate browser memory handling and pagination stability.
Learn more about our verified testing records in the PDF Tool Testing & Quality Assurance guide.
5. Core Tools & Technologies
- Markup & Styling: Semantic HTML5, Modern Responsive CSS3 (Custom Properties, Flexbox, CSS Grid).
- Client-Side Scripting: Vanilla JavaScript (ES Modules, Web Workers, HTML5 Canvas API, Fetch & Blob APIs).
- PDF Rendering & Manipulation: Client-side libraries including PDF.js for visual canvas rasterization, Sortable.js for zero-lag page reordering, and browser binary compilation.
6. Tools Maintained at Merge PDF
Arnab actively develops and maintains the complete suite of browser-based utilities on Merge PDF, including:
7. Collaboration & Oversight
Arnab works in direct partnership with co-founder and owner Kushal Biswas, translating user feedback and feature concepts into fast, secure web utilities. For any technical questions, feedback, or bug reports, feel free to contact the team through our Contact Page.