SysAdmin Quick Tools

Runs locally in your browser. Nothing is uploaded.
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Epoch —
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Patch Tuesday: —
A single-page toolbox for quick ops work — paste, convert, copy, move on.
JSON↔YAML, CSV→Markdown, subnet math, Base64/URL helpers, a quick line diff, and an offline password strength checker — all local.

SysAdmin Quick Tools is a free, local toolkit: YAML to JSON converter, JSON to YAML converter, CSV to Markdown table converter, IPv4 subnet calculator, Base64 encoder/decoder, URL encoder/decoder, text diff, and an offline password strength checker. Nothing is uploaded.

JSON ⇄ YAML CSV → Markdown Subnet Base64 / URL Diff Password
{}
JSON ⇄ YAML Converter
Auto-detect input. Pretty JSON + YAML output. Highlights parse errors.
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Readonly
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CSV
CSV → Markdown Table
Paste CSV. Outputs GitHub/Obsidian-ready Markdown table.
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Ready.
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Subnet Calculator (IPv4)
Enter IP and CIDR or netmask. Outputs network, broadcast, usable range, wildcard, and host counts.
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Ready.
Tip: you can paste 10.0.0.5/16 into either box and hit Calculate.
Network: —
Broadcast: —
First usable: —
Last usable: —
Prefix: —
Netmask: —
Wildcard: —
Total addresses: —
Usable hosts: —
b64
Base64 / URL Encoder & Decoder
UTF-8 safe. Handy for headers, tokens, and quick debugging.
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Ready.
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Text Diff (quick)
Line-based comparison for configs and snippets.
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Ready.
Legend: red only in A, green only in B, yellow changed line.
PW
Password Strength Checker (offline)
Estimates entropy and crack time. No upload, no storage.
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Score: ——
Estimate (bits): —
Character set: —
Length: —
Estimated crack time
Illustrative only. Depends on hashing and rate limits.
10k guesses/sec: —
1B guesses/sec: —
100B guesses/sec: —
Suggestions
  • Use 14+ characters.
  • Mix upper/lowercase, numbers, symbols.
  • Avoid reused or known-breached passwords.
Ready.