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A growing collection of free tools, in-depth articles, browser games, and hand-picked links — all running locally in your browser. No tracking, no uploads.
96Tools
21Languages
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Popular Tools
01Image ScramblerScramble and descramble images using space-filling curves02BIP39 Mnemonic GeneratorGenerate cryptographically secure BIP39 mnemonic phrases for cryptocurrency wallets03BcryptHash passwords or compare against existing bcrypt hashes04Google TrendsSee what the world is searching for — today's trending searches on Google05Handwritten SignatureDraw a signature and export it as a PNG with custom ink, background, or transparency
Featured Tools
Hand-picked utilities developers reach for every day.
Image Scrambler
Scramble and descramble images using space-filling curves
imagescramblerobfuscation
BIP39 Mnemonic Generator
Generate cryptographically secure BIP39 mnemonic phrases for cryptocurrency wallets
bip39mnemonicwallet
Bcrypt
Hash passwords or compare against existing bcrypt hashes
bcrypthashpassword
Google Trends
See what the world is searching for — today's trending searches on Google
googletrendssearch
Handwritten Signature
Draw a signature and export it as a PNG with custom ink, background, or transparency
signaturedrawingpng
Timezone Converter
Convert time between different timezones
timezoneconverttime
WHOIS / RDAP — edu.cn
Other domains use RDAP. edu.cn uses a dated static snapshot, not a live registration lookup. CDN caches can delay updates. edu.cn subdomains are automatically reduced to their root: www.neu.edu.cn → neu.edu.cn.
whoisrdapdomain
Base64 Converter
Encode and decode Base64 strings
base64encodedecode
Browser Fingerprint
Discover what your browser reveals about you — device, GPU, fonts, battery, network, and more
browserfingerprintprivacy
CSS Formatter
Format, minify, and beautify CSS
cssformatminify
HTML to Markdown
Convert HTML to Markdown format
htmlmarkdownconvert
IBAN Validator
Validate and parse International Bank Account Numbers (IBAN)
ibanvalidatorbank
General Blog
A general-interest blog covering internet culture, technology, AI, people, and events.
Why edu.cn WHOIS is hard to reach outside CERNET — and how to read a static snapshot
Why edu.cn WHOIS is hard to reach outside CERNET — and how to read a static snapshot
WHOISRDAPedu.cn
Why the Turing Test Lost Its Meaning in the AI Era
The Turing Test can still measure whether a system sounds human, but it no longer tells us whether that system understands, reasons, acts reliably, or deserves our trust.
artificial-intelligenceturing-testai-evaluation
The Crisis of Programming and Algorithm Contests in the AI Era
A data-led look at the 2026 contest cheating wave, changing AI rules, benchmark contamination, and how programming contests can remain meaningful.
AICompetitive ProgrammingAlgorithm