Haoyi Tools

What it does

Haoyi Tools is a privacy-first file processing toolkit. Convert images/audio/video formats, compress images up to 90%, crop with custom ratios, add watermarks, and generate QR codes. All processing happens locally in your browser - your files never leave your device.

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  Privacy First Tools - Free and PrivateFeb 2026 · privacyfirst.tools · ▲10

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  Privacy-first image, passport-photo, PDF, and city-finder tools with local-first workflows and clear cloud-backed AI where needed. Edit images, prepare ID photos and PDFs, find cities, extract palettes, and generate QR codes.

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  Hi HN, I’m Linn, the creator of ToolKuai (https://toolkuai.com). Like many of you, I’ve always been wary of "free" online file converters. Most of them are black boxes: you upload your private documents or images to a remote server, and you have no idea where that data ends up or how it’s being used to train models. I wanted to build a suite of tools (Video/Image compressor, OCR, AI Background Remover) that runs entirely in the browser. No files ever leave your machine. The Tech Stack To make this performant enough to rival server-side processing, I leaned heavily into modern…

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