Show HN: JFIF to JPG – A Lightweight Client-Side Converter (No Uploads Needed)
jfif-to-jpg.comHey!
I built a new "JFIF to JPG Convertor", a super lightweight web tool that converts .jfif images to .jpg directly in your browser — instantly and privately, without uploading anything to a server.
If you’ve ever downloaded images from the web or social media only to find them in the annoying .jfif format, this fixes that with a single click. Everything runs locally in JavaScript, so it’s fast and secure.
Features:
100% client-side (no uploads, no tracking, no cookies)
Instant conversion, even for large batches
Privacy-friendly — your files never leave your device
Minimalist design, mobile-friendly
Works offline once loaded
The goal was to make a clean, open, and privacy-respecting alternative to heavy online converters full of ads and analytics scripts.
Would love your feedback on performance, UI simplicity, or ideas for future improvements (e.g., drag-and-drop batch processing, EXIF handling, or direct rename support).
Try it here: https://jfif-to-jpg.com Thanks everyone for checking it out! A few technical notes about how JFIF to JPG works: It’s written in vanilla JavaScript, no frameworks — just an <input type="file">, a canvas, and the browser’s built-in toDataURL("image/jpeg") API. The conversion happens entirely client-side. The image never leaves your device — not even temporarily. That means full privacy, zero bandwidth use, and instant processing. The site doesn’t use cookies, analytics, or third-party scripts. It’s intentionally minimal to stay fast and compliant with privacy regulations. It’s designed to work offline once cached by your browser — ideal for users in low-connectivity areas. Tech Stack: HTML5 + JavaScript (no frameworks) CSS for a simple responsive layout Hosted on Cloudflare Pages for global CDN + SSL Upcoming ideas: Drag-and-drop multiple file support Preserve EXIF data on conversion Add a dark mode toggle Would love to hear your thoughts on privacy-first frontend tools like this — do you prefer pure JS local tools over heavier web apps?