Show HN: Browser-only 64-color Wplace image quantizer (no server, free)

Hi HN,

I play a lot of *[Wplace](https://wplace.live)*, the pixel-art world map that limits every drawing to the official 64-colour palette (32 free, 32 paid). Re-colouring images by hand was painful, so I built a *client-side tool* that:

* takes any PNG/JPG * maps each pixel to the nearest of the 64 official colours * lets you *toggle paid colours off* → no wasted droplets * adds optional Floyd–Steinberg dithering * shows live pixel / colour stats for cost estimation * exports a ready-to-place PNG or copies it to the clipboard (all computation in the browser, nothing uploaded)

*Link* <https://wplacecolorconverter.online>

*Tech notes*

* TypeScript + Vite + React + Tailwind * Pixel work happens in a Web Worker on an `OffscreenCanvas` * Quantisation is ~300 LOC (RGB Euclidean distance; optional error diffusion) * No back-end, so it runs offline and keeps images local

I’d love feedback on:

* performance for big images (>512 px) * better distance metrics (ΔE?) or a faster lookup table * whether a WebGPU / wasm port is worth it * other pixel-art communities that might need custom palettes

Thanks for reading!

Ask HN: Why does the US Visa application website do a port-scan of my network?

Ask HN: Non-Smart TV Recommendations?

My first project in Go is a terminal dashboard (what a programming language)

Ask HN: Recently laid off developer looking for solo product ideas

Where is the exponential growth part of AI?

Seda – Discovery Engine for the Internet – Co-Founder/CTO – Raising $15M

Ask HN: AI Code Smells

Warp sends a terminal session to LLM without user consent

Ask HN: Where are the best online gathering places for humans?

Dagger and opencode and agnostic agents and SSH app = most portable dev kit

HN meta: 99% packet loss on news.ycombinator.com

Ask HN: Best books on various topics of drawing, art and animation?

What services or apps did you see abroad and wonder: why don't we have them?

VC-backed company just killed my EU trademark for a small OSS project

F-Droid build servers can't build modern Android apps due to outdated CPUs

Ask HN: Do you think programming as a job will end soon and if so, how soon?

Ask HN: How do you get your devs to understand your customers?

Ask HN: What to do with a pure mathematics degree?

Tell HN: Somebody please make a faster task management system

Ask HN: Do you still bookmark websites?

iCloud Mail or Gmail?

Ask HN: How can ChatGPT serve 700M users when I can't run one GPT-4 locally?

AI might worsen diagnostics for physicians

Ask HN: Tell me about the best programmer you worked with

Ask HN: If technology is so good for the world, why are we becoming less happy?

Ask HN: Is context-switching the real productivity killer?

Show HN: Browser-only 64-color Wplace image quantizer (no server, free)

Comments (0)