Free online string and text tools for encoding, decoding, hashing, formatting and converting text in your browser
Stable domains for local development ports, eliminating conflicts with free open-source tunnels and paid cloud options
Stage
Not given
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Founded
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Based in
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Pricing model
Free
Freemium
Pricing
Not given
Free and Open Source: $0 (unlimited local tunnels, open source); Professional: $49/mo or $490/yr (unlimited cloud tunnels, visitor auth, feedback comments); Team: $149/mo or $1,490/yr (everything in Professional plus unlimited members, teams, shared subdomains, approvals, organization billing); Ente
Key features
Base64 encoding and decoding
URL encoding and decoding
JSON formatting, validation and minifying
JWT decoding with readable timestamps
SHA-256 and other cryptographic hashing
UUID generation with multiple versions
Text diffing with multiple formats
Chainable pipelines with live preview
CSV to JSON and JSON to YAML conversion
Regular expression explanation in plain English
Stable local domains (*.portzero.local) for processes and containers
Cloud tunnels (*.tunnel.portzero.cloud) with HTTPS for LAN and internet access
Support for multiple programming languages
Git worktree support with per-branch URLs
AI agent integration with MCP server
Visitor authentication and access control
Feedback comments on live tunnels
Team access policies and approvals
Audit log (Enterprise plan)
Organization billing with no per-seat charges
What makes it different
All processing happens in your browser with no data uploaded to servers
Chain multiple tools into pipelines with live preview of each step
Available across VS Code, CLI, MCP and as a Node.js library
No cookies or tracking scripts, privacy-focused
248 utilities organized by category with guides and worked examples
Eliminates port conflicts by assigning stable virtual domains instead of port numbers
Free and open source for local use; no additional cost for cloud features on paid plans
Flat pricing with no meters, overages, or per-seat charges
Agent-ready with native MCP server integration for AI coding agents
Works across multiple OS and languages with zero port bookkeeping required
String Utility Belt
Port Zero