OfflineKit – 64 local-only browser tools

A privacy-first utility suite where every tool runs in the browser and never uploads your data.

Problem

People constantly need small utilities for converting files, compressing images, or formatting JSON, but most online tools upload files to a server. When the file is a contract, ID, or proprietary code, that is a non-starter. Offline alternatives require installs and are scattered across apps.

Solution

A pure front-end site or PWA with 64 common tools (image compression, format conversion, JSON formatting, hashing, QR generation, etc.) that all run locally in the browser. Files never leave the device, and the page states this clearly.

Users

Privacy-conscious users in legal, healthcare, finance, and development who handle sensitive files

MVP

Ship 10 high-frequency offline tools first (image compression, PDF merge, JSON format, Base64, hash, QR); all processing in-browser; clear 'files never leave your device' messaging; PWA for offline use

Revenue

Free base tools, one-time purchase or subscription for batch processing and advanced utilities; self-hosted license for enterprises

Why now

Privacy awareness is rising, but most online tools still upload files; WebAssembly and modern browser APIs are powerful enough for an indie developer to cover long-tail needs with one front-end project