Fifteen browser tools live in my bookmark bar. Five of them get opened daily. Here they are, and why each one earned a permanent spot.
All five are from the same free, no-install, no-tracking set: wuchunjie00.github.io/devtools.
1. Base64 Tool — open it
Daily use: decoding the base64 blobs that show up in logs, headers, and "just paste this" support tickets.
Why it stays: paste → encode → decode → copy. No file upload, no "pro plan" wall. The data never leaves the tab.
2. JWT Decoder — open it
Daily use: reading a token's payload during debugging — exp, sub, role, whatever is in the claims.
Why it stays: local decode means I am not pasting a bearer credential into some third-party site. That one decision is why I use this over the paid "API toolkits".
3. Hash Generator — open it
Daily use: quick MD5/SHA-256 checks — file integrity, verifying a value a doc claims, comparing checksums.
Why it stays: it is three seconds from "I wonder what this hashes to" to the answer.
4. CSV to JSON — open it
Daily use: converting the CSV exports that every SaaS loves to send me into something my scripts can read.
Why it stays: paste in, copy out, paste into the script. No account, no 10-row free limit, no "upgrade to export".
5. Diff Checker — open it
Daily use: "are these two config blocks actually different?" — env files, API responses, copy-pasted configs.
Why it stays: side-by-side diff with the differences highlighted. It answers the question in 10 seconds that used to take 10 minutes of squinting.
The Pattern
Notice what none of these do: no login, no upload, no tracking, no trial. They are static pages of HTML/CSS/JS that run in your tab. That is the whole feature set, and it is why I trust them with data I would not paste anywhere else.
The Rest of the Set
The other nine — cron parser, YAML to JSON, HTML entities, HTML to text, lorem ipsum, password generator, QR code, slug generator, UUID generator — cover the weekly and monthly tasks. Same rules: free, local, no account.
Bookmark the index: wuchunjie00.github.io/devtools
From the same toolbox
-
ScaffoldX — generate production-ready project templates in seconds:
npx scaffoldx-cli -
DotGuard — scan
.envfiles for exposed secrets:npx @wuchunjie/dotguard -
GitPulse — git analytics (commits, contributors, activity) in your terminal:
npx @wuchunjie/gitpulse -
SnippetX — save, search, and copy code snippets from the terminal:
npx @wuchunjie/snippetx
☕ If This Saved You Time
All of these tools are and will always be 100% free. If they make your day a little easier, consider fueling the next one:
Built with ❤️. Zero dependencies, zero tracking, zero bloat.
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