Building File Flex as a clean image conversion platform

The Motivation Behind the Project

File Flex is a file conversion platform for images, built to keep the workflow short and understandable. The aim was to make format conversion feel like a quick task instead of a complicated process.

Core Features and Design Goals

• Image conversion flow: the core task is moving files from one format to another.
• Simple upload and transform steps: the app keeps the user moving forward instead of wandering through settings.
• Responsive interface: useful on different screen sizes without needing separate experiences.

Technical Implementation

• Implemented client-side image format conversion using the Canvas API and Blob APIs to transform images between formats (PNG, JPEG, WebP, etc.) entirely in the browser, avoiding server round-trips and keeping user files private.
• Built a drag-and-drop upload flow with format auto-detection that identifies the input format and presents only valid conversion targets, reducing user confusion.
• Designed a batch processing pipeline that handles multiple files in sequence with progress indicators, then packages results for individual or bulk download.

The Technology Stack

Built with Next.js, TypeScript, and Tailwind CSS. All conversions run client-side using Canvas API and Blob manipulation, so no files leave the user's browser. The UI uses responsive Tailwind layouts with a step-based flow.

Final Reflections

The best utility apps get out of the way, and this project was an exercise in exactly that.