How to Build an Infinite Canvas Image Discovery App

An infinite-scrolling image discovery platform for browsing, saving and sharing images

Written by

Naman

Reviewed by

Debayan

Last updated:

June 4, 2026

min read

Table of Contents

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Overview

Pixarama provides an infinite canvas of image tiles, progressive quality upgrades, collections, sharing, and a mobile-first experience. Users scroll or pan endlessly, save favorites into collections, and share public collections by link.

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Tech Stack

Layer	Tools
Frontend	React, Hooks, Axios, React Router, Lucide React, Sonner
Rendering	DOM absolute positioning, CSS transforms
Backend	FastAPI, Motor (async MongoDB), Pydantic, HTTPX
Auth & Security	JWT, bcrypt
Deployment	Kubernetes, Supervisor, Ports: frontend 3000, backend 8001
External APIs	Pixabay, Wikimedia Commons

Architecture Overview

Main Features

Feature	What it does
Infinite canvas	Pan and zoom over a tile-based world of images
Progressive loading	Load preview then upgrade to higher quality
Collections	Save images to named collections and share links
Image details	Large preview, attribution, download
Sharing	Public links to collections
Auth	JWT login and protected actions
Mobile support	Touch pan, pinch zoom, safe area support

Image Sources and Integration

API	Role	Notes (Heads Up!)
Pixabay	Primary image source - preview, webformat, largeImage	Watch rate limits; handle 429 errors. Once signed up, get the API by going to https://pixabay.com/api/docs/#api_key
Wikimedia Commons	Secondary source for attribution and variety	Use thumbnails and credits; combine results with Pixabay

Key Challenges and Solutions

Challenge: Canvas rendering reliability

Problem: PixiJS caused rendering failures in some environments.
Solution: Replace with simple DOM absolute-positioned <img> tiles and CSS transforms.

Challenge: Grid spacing gaps

Problem: Extra gap between tiles caused black seams.
Solution: Use tile edge spacing math and position at TILE_SIZE intervals.

Challenge: Pixelated images

Problem: 150px previews looked blurry on 200px tiles.
Solution: Progressive loading: preview → webformat (640px) → large image for downloads.

Challenge: CORS issues

Problem: crossOrigin blocked in some cases.
Solution: Remove crossOrigin on simple display; only use crossOrigin when canvas pixel access is needed.

Challenge: Mobile UX and safe area

Problem: Notch, home bar and touch controls needed fixes.
Solution: Add viewport-fit and env(safe-area-inset-*) CSS, implement touch handlers and splash guidance.

Performance Optimizations

Optimization	Why it matters
Tile loading with margin	Only create DOM for nearby tiles
LRU tile cache	Keep memory use bounded
Progressive image upgrade	Fast first paint, better final quality
API caching	Reduce rate limit hits and latency
Lazy DOM creation	Avoid excessive reflows on large world sizes

Next Steps and Extensions You Can Add

Add paid tier for curated collections and higher download rate.
Add AI-powered image tagging and recommendations.
Add offline tile prefetch and background sync for mobile.
Add user collections sync between devices.

Wrapping Up

You now have a complete breakdown of how Pixarama was built from the ground up:

The full architecture
The rendering strategy
Image API integration
Mobile and performance decisions
The challenges and how each was solved
Feature set, UX flow, and data handling
Deployment structure

This project demonstrates how a simple DOM-based approach combined with modern APIs and progressive techniques can create a smooth, production-quality infinite image explorer.

Check out our finished product over at https://visual-collections-2.emergent.host/ or check out the super-short overview of the app down below!