Developers rely on dozens of small utilities every day — UUID generators, hash checkers, formatters, encoders, token generators, JWT decoders, and more.
But most websites offering these tools bombard you with ads, analytics scripts, or — even worse — send your input to their servers.
So we decided to fix that.
Every tool at credential.help is:
- privacy-first
- completely free
- runs 100% locally in your browser
- requires no account or tracking
- built for speed and reliability
Here’s a curated list of the online tools developers actually use daily — including our own (because they finally do things the right way).
1. UUID Generator
For API design, databases, caching, migrations, distributed systems.
Generate v1, v4, or v7 UUIDs instantly using the UUID Generator.
2. ULID Generator
Lexicographically sortable, URL-safe, and collision-resistant.
Essential for modern distributed systems. Generate them in one click using the ULID Generator.
3. Password Generator
Strong, random, customizable credentials powered by window.crypto.
Use the Password Generator to create secure passwords instantly.
4. Passphrase Generator
For human-friendly but extremely strong credentials.
Try the Passphrase Generator.
5. API Key Generator
Essential for secrets, signing keys, backend services, and CLI tools.
Generate secure keys using the API Key Generator.
6. JWT Decoder
Inspect, validate, and debug JSON Web Tokens safely and locally — no secrets sent anywhere.
Use the JWT Decoder.
7. Hash Generator (SHA-256, SHA-1, MD5)
Generate or verify file and text hashes quickly, directly in your browser using secure cryptographic APIs.
Try the Hash Generator.
8. Base64 Encoder/Decoder
For binary handling, HTTP headers, testing, debugging, and quick transformations.
9. JSON Formatter & Validator
Pretty-print JSON, validate structure, and catch trailing commas or malformed objects.
Great for debugging API responses.
10. Regex Tester
Instant feedback for pattern matching, validation, and debugging.
A must-have for frontend devs and backend engineers alike.
11. URL Encoder/Decoder
Perfect for OAuth flows, redirects, query parameters, and debugging integrations.
12. QR Code Generator
Quickly encode URLs, tokens, connection strings, and secret keys into QR Codes for easy scanning.
13. Cron Expression Validator
No more guessing if 0 0 * * * means midnight or midday.
Validate and test cron schedules instantly.
14. Color Converter
Convert HEX ↔ RGB ↔ HSL for frontend work, UI tweaks, or rapid prototyping.
15. Lorem Ipsum Generator
Because placeholder text is still a thing in 2025.
16. Markdown Previewer
Render Markdown instantly for docs, READMEs, blog posts, and wikis.
17. Diff Checker
Compare JSON, text, or code blocks without installing anything locally.
18. Epoch Timestamp Converter
Convert Unix timestamps, compare dates, test time-based flows, and debug APIs.
19. IP Parser & CIDR Calculator
For network diagnostics, VPN setups, routing rules, container networks, and cloud configs.
20. HTML Entity Encoder/Decoder
Fix broken characters, sanitize inputs, and prepare text for rendering.
Why Developers Prefer Local-Only Tools
Here’s the reality: most developer tools online send your input to a backend server.
That means:
- your tokens? sent
- your passwords? stored
- your JWTs? logged
- your API keys? exposed
Credential.help flips the model.
Everything uses secure browser APIs like:
window.crypto.getRandomValues()
TextEncoder()
crypto.subtle.digest()
Nothing leaves your device.
Nothing is logged.
Nothing is collected.
Nothing touches any server.
Who Are These Tools For?
- Developers
- Pentesters
- Cloud engineers
- SREs
- Students
- Backend engineers
- Frontend devs
- DevOps teams
- Security engineers
- Anyone who needs reliable utilities every day
The Tools Developers Actually Bookmark
Most devs don’t bookmark flashy dashboards — they bookmark utilities.
And that’s why credential.help exists: to provide clean, safe, fast, and genuinely useful tools that developers can rely on daily, without worrying about privacy or data leaks.
Final Thoughts
These 20 tools cover 90% of what engineers need during a typical workday — quick transformations, secure randomness, debugging helpers, and cryptographic utilities.
If you want developer tools without abusive ads, tracking scripts, analytics, cookies, logins, or backend processing, you’re in the right place.
More tools are coming soon — all free, all local, all secure.