DevelopK.kr
All Over Tools
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A Lot of Tools
What is My IP Address
BrowserLeaks.com
IPWhois.net
DevPicker
Best Programming Toolkit
tooltool.net
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All Over Tools
JSONFormatter.org
JSON Formatter & Validator
Online JSON Tools
Free online developer utilities — network, security, coding & text tools. No install, no sign-up; nothing you enter is sent to a server.
설치·회원가입 없이 브라우저에서 바로 쓰는 무료 개발자 유틸리티 모음 (네트워크·보안·코딩·텍스트 61개 도구). 입력값 서버 전송 없음.
DevelopK.kr Best Programming ToolkitDevelopK.kr's answer
developk.kr offers 61 free developer tools you can use instantly in your browser, no sign-up required. All processing happens client-side, so nothing you type is sent to a server. The tools are organized into 4 categories (network, security, coding, text), and 15 written guides are included to help you use them.
DevelopK.kr's answer
Developers and engineers who run into small, repetitive tasks during their workday, things like formatting JSON, generating a hash, checking DNS records, or converting units, and want a fast browser-based tool instead of hunting through ad-heavy sites. It's also popular with solo developers and freelancers who value the no-signup, privacy-friendly approach.
DevelopK.kr's answer
developk.kr started as a single indie side project: small dev tools built one at a time to solve the maker's own recurring annoyances, like reformatting a messy JSON blob or looking up DNS records, on sites full of ads and forced sign-ups. Each tool was added because it was genuinely needed for real work, and the collection has since grown to 61 tools across 4 categories, plus 15 written guides.
DevelopK.kr's answer
Most online tool sites require sign-up, run ads, or collect your email before you can use them. developk.kr skips all of that. Because everything runs client-side in your browser, it's also safe to paste sensitive values like API responses or auth tokens without worrying about where that data goes.
DevelopK.kr's answer
developk.kr is built as static HTML/CSS/JavaScript (no backend framework), with a shared common.js handling the header, footer, and ad mounting across all tool pages. It's hosted and served through Cloudflare (Pages, with redirects handled via a Cloudflare Pages Function), and uses GA4 for analytics.
All Over Tools - Clean, transform, and validate your data with our secure, browser-based tools. No logs, no tracking, just high-performance utilities.
tooltool.net - Online toolkit designed for software engineers and developers, including JSON parsing, Base64 encoding/decoding, MD5 encryption, URL encoding/decoding, timestamp conversion, UUID generation and other practical tools.
What Is My Tools - Free browser tools that reveal your IP address, browser, timezone, internet speed, and more. No signup — instant results. Privacy Policy explains analytics and ads.
FreeFormatter - Freeformatter is a platform that contains free online tools for developers, including formatters (json, html, xml, sql, etc.), minifiers (css, javascript), compactors, validators, and much more.
A Lot of Tools - 380+ free online tools — no sign-up, in your browser.
JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.