Tools
ESEverything I've built, in one place. Small, focused tools — free, and no sign-up.
Cybersecurity
Privacy-first micro-tools hosted at tools.yongchivo.com. The client-side ones never send your data anywhere.
Password Generator
Create strong, random passwords entirely in your browser.
Password Strength Analyzer
Check how resistant a password is to cracking — nothing leaves your device.
Subnet Calculator
Work out network ranges, masks and hosts from any CIDR block.
Security Headers Checker
Paste a URL and audit its HTTP security headers in seconds.
Breach Checker
Find out if an account appears in known data breaches.
Which Cyber Role Are You?
A quick quiz to find your fit: pentester, SOC analyst, forensics and more.
EXIF Viewer
See the hidden metadata in a photo — camera, timestamp, even GPS location. 100% in your browser.
PDF Metadata Editor
Inspect and strip the hidden metadata in a PDF — author, software and timestamps.
File Converter
Free, private file conversion that runs entirely in your browser.
Browse every conversion 38
38 conversions available — images, data, PDF, audio and video. Nothing is ever uploaded.
Most popular
Analytics
Upload a platform export and read it the way it should have been shown to you — all in your browser, nothing uploaded.
Open the dashboard 2
Google Search Console and App Store Connect: totals, trends, funnels and period comparison — 100% in your browser.
Google Search Console
Analyze a Queries or Pages CSV export: summary totals, a sortable table, a CTR-vs-position scatter and a ranking distribution — plus two-file comparison.
App Store Connect
Analyze a Sales and Trends or App Analytics export: downloads and proceeds over time, the conversion funnel, day-of-week performance and source breakdown.