厭倦會上載檔案的「免費工具」，作者打造 KeptTools 瀏覽器專用工具
I Got Tired of “Free Tools” That Upload My Files — So I Built Browser-Only Ones
KeptTools 提供一組只在瀏覽器運作的開發者及圖片工具，讓用戶毋須建立帳戶或上載檔案即可處理內容。工具包括 JSON 格式化及驗證、JWT 解碼、PNG/JPG 轉 WebP 和圖片裁剪；關閉分頁後，伺服器不會為處理而儲存用戶檔案。部分工具首次使用時會下載小型模型，下載的是模型而非用戶照片。
Most “free online tools” ask you to paste text or upload a photo.
What they don’t always make clear: that content often leaves your device.
For JSON with client data, a JWT, a draft you’re not ready to publish, or a passport-style photo — that’s a bad trade.
So I built KeptTools: a small set of developer and image tools that run in the browser. No account. No “upload to process.”
What “browser-only” means here
When you open a tool page:
- The work happens on the page (JavaScript in your browser)
- You can format, convert, crop, or decode without creating an account
- Closing the tab ends the session — nothing is stored as “your file” on our servers for processing
A few tools download a small model the first time (for example, portrait background replacement). That download is the model, not your photo.
What’s live
Developer tools
- JSON formatter / validator
- JSON converter (CSV, Laravel, TypeScript, PHP, and more)
- SQL formatter
- JWT decoder
- Base64, hash, URL/HTML encode
- Regex tester, cron generator, UUID/slug
Image tools
- PNG/JPG → WebP
- Compress
- Crop
- Image → SVG
- Change background (white / blue / custom / transparent)
Text utilities
- Word counter
- Case converter (camelCase, snake_case, kebab-case, …)
- And more on the site
Why I care about this
I use these utilities every week. I don’t want a random site keeping a copy of:
- a token
- a production-ish JSON blob
- an ID photo
Privacy shouldn’t be a premium feature for basic tools.
Stack (short)
Laravel + Vite + Tailwind + Alpine. Tools are client-side where it matters.
What I’d love feedback on
- Is “browser-only / no upload” a strong enough reason to switch tools?
- Which tool would you open first from the homepage?
- What’s missing that would make you bounce?
If you try something and it feels unclear, tell me — I’m iterating from real use.
Site: https://kepttools.com
來源：DEV Community · dev.to