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Lumli - Professional In-Browser Image & QR Tools
Lumli Team · 2026-06-25 · via Hacker News: Show HN

100% Secure & Local: Images are processed in your browser and never leave your device.

01 / Speed

Process Images Up to 10x Faster

Experience professional grade image processing powered by browser native WebAssembly. Lumli unlocks multi-threading to leverage your device's full CPU cores, delivering lightning fast smart resizing, compression, upscaling and background removal instantly.

Hardware-Accelerated (Multi-Core)

02 / Privacy

Your Images Never Leave Your Device

Your privacy is our utmost priority. Unlike traditional online converters, Lumli runs entirely sandbox-secured inside your local browser storage. Your media files are processed locally and never touch an external server or cloud database.

Zero Uploads • No Sign-Up Required

03 / Formats

Convert HEIC, AVIF, PNG, JPG & More

Easily switch extensions between Apple's HEIC, AVIF, WebP, PNG, JPEG, and SVG layouts without losing original pixel density. Our precise engine preserves transparent alpha channels, rendering perfectly crisp assets optimized for modern web architectures.

HEIC + AVIF Input & Transparent Alpha OK

Frequently Asked Questions

Everything you need to know about Lumli web tools.

Can I use Lumli offline without an internet connection?

Yes. Once loaded, Lumli runs directly in your browser and can work offline for supported features. You can also install it on your device for easier access.

Do I need to install Lumli, or can i use it directly in my browser?

No installation is required. You can use Lumli directly in your browser on both desktop and mobile.If you want quicker access, you can also install it on your device like a web app, but it’s completely optional.

Are my images uploaded to a server or stored anywhere?

No. Lumli processes everything locally in your browser. Your images are never uploaded, stored, or shared anywhere.

Can I upload and process Apple HEIC images?

Yes. Lumli supports Apple's HEIC format as an input across all toolsets. You can upload HEIC images straight from your iPhone or Mac and convert them into JPG, PNG, WebP, AVIF, or vector SVG layouts where supported.

Is there a file size limit for uploading images?

There is no strict file size limit. Since Lumli processes everything locally using your device's hardware, you can handle large, high resolution images. The performance depends entirely on your device.

What image formats are supported?

Lumli supports PNG, JPG, JPEG, WebP, AVIF, Apple HEIC inputs, and SVG layouts.

Why is Lumli completely free to use?

Lumli is free because it runs entirely in your browser, so there are no server or cloud costs. This allows us to keep it free and private. If you like it, you can support us by buying a coffee.

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