Build an Image Format Converter with Claude Code

Build an Image Format Converter web app. People search for "image format converter" about 4,700 times a month, plus related searches like "convert jpg to png", "image converter online", "change image format". The goal is a tool that ranks for those searches and makes money.

What it should do:
Build an image format converter web app. Create a homepage with drag-and-drop upload area and format selector showing popular conversions (JPG↔PNG, WebP, AVIF, SVG). When users upload images, show thumbnails with original format info and target format preview. Add batch conversion for multiple images and quality settings for lossy formats. Include file size comparison and optimization recommendations. Show conversion progress and bulk download option. Use a clean, technical design with blue and gray colors. Focus on the upload and conversion flow first.

How to build it:
1. Read this folder first. If it is empty, set up Next.js (App Router, TypeScript, Tailwind). Write a short PLAN.md with the pages, components, any library or API you need, and what you are leaving for later. Then build.
2. Put the tool itself on the homepage so a visitor can use it within seconds, with no sign-up. Do the processing in the browser where you can, so it is fast and cheap to run. Look at how CloudConvert, Convertio, TinyPNG do it and make ours simpler and faster.
3. Make it rank. Use "image format converter" in the title tag, H1 and meta description. Under the tool, add a short how-to and an FAQ with FAQPage schema, and add a sitemap and robots.txt. Scaffold these programmatic pages from one template and a data file: /convert-[format1]-to-[format2], /image-converter-for-[use-case], /optimize-images-for-[platform].
4. Monetisation: Freemium: 10 conversions/day, $6/mo unlimited + batch processing. Add a pricing page and the free usage limit, and leave Stripe checkout as a clearly marked stub with the environment variables it needs.
5. Run it locally and test the main flow end to end, including edge cases like empty input and very large files. Fix what breaks, then finish with a summary of what works, what is stubbed and how to deploy it to Vercel.

Paste it into Claude Code in an empty folder. It plans first, so read PLAN.md and steer before it starts building.