YurlieBuilt for developers
who want things simple
Yurlie is a small collection of developer and network tools that just work. No account required, no data sent to servers. Most tools run entirely in your browser.
Why Yurlie exists
Every developer has a tab open to some online tool: a JSON formatter, a CIDR calculator, a Base64 decoder. Most of those sites are cluttered with ads, require you to create an account, or silently send your data to their servers.
Yurlie started as a personal toolkit. The goal was simple: fast, distraction-free tools with a clean UI. No dark patterns, no cookie banners chasing you around.
Principles
Privacy by default
Data you paste into a tool stays in your browser. We don't log it, store it, or send it anywhere.
No account needed
Every tool on the free tier is immediately accessible. Open a URL, use the tool, close the tab.
One tool, one job
Each tool does exactly what its name says. No upsells, no cross-promotions inside the tool UI.
Fast
No spinner, no loading state. Results appear as you type. Most tools compute in under a millisecond.
What's in the toolbox
The current roster spans four categories:
- Network: CIDR calculator, subnet tools, IP range, wildcard mask, IPv4/IPv6 converters
- JSON / Data: formatter, validator, minifier, viewer, diff, JSON↔CSV converters, CSV analyzer
- Encoding: Base64, URL encoder/decoder, JWT decoder, HTML encoder/decoder
- Developer: UUID, hash generator, regex tester, SQL formatter, YAML validator, XML formatter, cron generator, text diff, timestamp converter
More tools are added regularly. If something's missing, reach out.
API access
Some tools are available as a REST API for automation and CI pipelines. The API is rate-limited on the free tier and requires an API key, no personal data required beyond an email address for delivery.
See the API documentation for endpoints, rate limits, and usage examples.
Got feedback or a bug report?
Open an issue or send a message directly.