Skip to main content

Home
Blog
Weibo
Photos
Toolbox
About

Developer Tools

Code Diff Tool

Compare two snippets side by side, with the differing lines highlighted as you type

Some tools are offlineThe backend server is shut down, so tools that need an API no longer work.

Network Tools

Public IP Lookup
IP Address Lookup
Domain Dig Lookup
Domain Whois Lookup
Domain QPS Stress Test
Domain ICP Filing Lookup
DNS Resolution Visualizer
ASN Lookup
IPv6 Format Converter
HSTS Preload Check

Developer Tools

UUID / GUID Generator
FreeMarker Playground
Code Diff
XPath Tester
Naming Case Converter
Unix Timestamp Converter
Byte Unit Converter
UEditor Rich Text Editor
TinyMCE Rich Text Editor
IK Analyzer
Keyword Extractor
Deduplication Tool
iOS Plist Generator
Cron Expression Tester
LLM VRAM Calculator

Encryption Tools

Password Generator
MD5 Hash
SHA-1 Hash
SHA-256 Hash
SHA-512 Hash
PBKDF2 Tool
URL Hex Encoder
URL Encoder / Decoder

Miscellaneous

KMS Activation
QR Code Generator
BT (BitTorrent) Tracker
Search Indexing Pusher

Notes on engineering, design and reading. Subscribe via RSS to get the latest posts.

Social

Dev QQ Group
Github
Gitlab
Mastodon
Feedback

Charity

Github Sponsors
CSAPA
UNICEF

Recommended Vendors

HETZNER (€20 credit)
Vultr ($100 credit)
Alibaba Cloud
Tencent Cloud
Huawei Cloud
Donglu Network
VPSOR Cloud

More

About RenFei
Terms of Use
Privacy & Cookies

Copyright © 2026 RENFEI.NET All rights reserved.

京ICP备2024095283号-1 京公网安备11010802045163号

To MJJsThis site does not participate in any stress-testing activity. No flooding, CC or DDoS please — if you are a tech enthusiast too, let’s be friendly.

a855fc4 · 2026-09-21 12:16 UTC