Quick developer utilities

Small, everyday helpers that run locally — handy when you don't want to paste data into a random online service.

By goal

Pretty-print / validate JSON → JSON Formatter
Clean, convert or inspect CSV → CSV Helper
Compute MD5 / SHA hashes → Hash Generator
Generate a QR code → QR Generator (and scan one)
Draw flowcharts from text → Mermaid Editor

Why local matters here

Config files, tokens and customer CSVs are exactly the data you should not paste into an unknown server. These tools keep everything in the browser tab.

Related guides

Share files without leaking private data
Work with PDF files

All task guides · Developer tools category · Knowledge pack root

想直接算一次？開啟工具　全程瀏覽器本地運算，資料不上傳

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