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UUID / Hash / Base64 / URL Encode

Four daily dev tools in one: bulk UUID v4, SHA-256/1/512 hash, Base64 encode/decode (URL-safe option), URL encode. Web Crypto API standard.

All tools Browser-only

Count: UPPERCASE No dashes

Generated via crypto.randomUUID() — standard UUID v4, cryptographically secure.

Four tools in one

🔑 UUID v4: generate 1-100 at once, optional UPPERCASE and dash-stripped (for databases that dislike special chars)
#️⃣ Hash: SHA-256 / SHA-1 / SHA-512 — live as you type
🔐 Base64: UTF-8 encode/decode (full Vietnamese support), URL-safe option
🔗 URL Encode: for query strings and form data

Why no MD5?

MD5 was deprecated in the 2010s due to collision attacks — no longer safe for passwords or signatures. Web Crypto API doesn't expose it for that reason. Default to SHA-256.

Who this is for

Fullstack/backend/devops engineers — debug JWT, format JSON/SQL, parse cURL, compute CIDR subnets, draft Mermaid diagrams, write conventional commits… Daily toolkit alongside your terminal and editor.

FAQ

Is my pasted code/token sent anywhere?

No. All TopDev dev tools run 100% client-side — JWT, SQL, JSON, cURL, regex… process in-browser. Disconnect to verify. Safe for internal tokens, production DB queries, API keys.

Does it work offline / install as a PWA?

Tools work offline after the first load. Installable PWA is on the roadmap — for now you can bookmark and use without internet.