Free Online Tools

IT & Security Tools

Free, browser-based tools for IT professionals and security enthusiasts. No data leaves your browser - everything runs locally.

PopularLive

Subnet Calculator

Calculate IP subnets, CIDR ranges, and network masks. Supports IPv4 with visual bit breakdown.

Instant CIDR breakdowns with visual bit maps

IPv4 supportCIDR notationSubnet visualization

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PopularLive

Password Generator

Generate secure, random passwords with customizable complexity settings.

Cryptographically secure with entropy scoring

Customizable lengthCharacter setsPassphrase mode

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Live

Base64 Encoder/Decoder

Encode and decode Base64 strings. Supports text and file encoding.

Text encodingFile supportURL-safe mode

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Live

Hash Generator

Generate MD5, SHA-1, SHA-256, and other cryptographic hashes.

Multiple algorithmsFile hashingHMAC support

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NewLive

JWT Debugger

Decode, verify, and debug JSON Web Tokens without sending data to servers.

Client-side only - your tokens never leave the browser

Local decodingSignature inspectionExpiry checking

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NewLive

DNS Lookup

Perform DNS lookups for A, AAAA, MX, TXT, NS, and other record types.

Multiple record typesCloudflare DoHHistory tracking

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NewLive

Invoice Generator

Create professional invoices with live preview. Add line items, tax, discounts, and print or save as PDF.

Professional invoices entirely in the browser

Line itemsTax & discountsPrint/PDF

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NewLive

Text Diff

Compare two texts side-by-side with line-level and word-level diff highlighting.

LCS-based diff algorithm with instant results

Side-by-side viewUnified viewWord-level diff

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