Time & date
Timestamps, time zones and date formats
Dayeku
Handy tools for developers, ready when you open them
57 tools across 11 categories — all free, no sign-up
Featured tool
IP address lookup
Enter an IPv4 or IPv6 address, or a CIDR block, to get its location, ISP, address classification and network range. The lookup runs on this site's server against a bundled offline database — no third-party API is involved.
Try one of these: 8.8.8.8 114.114.114.114 2001:4860:4860::8888 10.0.0.0/8
- IP location
- United States · Ohio · Columbus
- ISP
- Amazon
- Network type
- Data center / cloud provider
- IPv6
- Not used for this connection (IPv4)
Location, ISP and network type all come from this site’s offline IP-range database; the network type is grouped from the ISP field and cannot tell home broadband apart from mobile data. The IPv6 row reflects the protocol used for this connection only; it does not show whether your device supports the other protocol.
Recently looked up
- 47.107.231.133 中国 · 广东省 · 深圳市 · 阿里
- 240e:93d:a::1b 中国 · 北京市 · 电信
- 222.91.87.177 中国 · 陕西省 · 西安市 · 电信
- 222.91.39.205 中国 · 陕西省 · 安康市 · 电信
- 2001:4860:4860:6::8d United States · Florida · Miami · Google LLC
- 141.101.79.225 United States · California
- 124.118.101.187 中国 · 新疆 · 巴音郭楞 · 电信
- 47.107.243.116 中国 · 广东省 · 深圳市 · 阿里
- 36.111.35.187 中国 · 广东省 · 广州市 · 电信
- 240e:983:1003:fff0:ffff:ffff:ffff:fff2 中国 · 北京市 · 电信
Public addresses only, last 50 kept, with nothing identifying who looked them up.
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World time
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Currency Converter
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RMB amount in words
Convert between figures and the Chinese capital amount, checked both ways
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Color format converter
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Length converter
Convert one length into 16 metric, imperial and Chinese units at once
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Password generator
Generate configurable passwords with the browser’s secure RNG
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Text hash (MD5 / SHA)
Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 locally
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IP address lookup
Look up the location, network operator and address type of an IPv4 or IPv6 address
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Unix timestamp converter
Convert dates and timestamps in seconds, milliseconds, microseconds or nanoseconds
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Character & word counter
Count characters, words, lines, CJK ideographs and UTF-8 bytes
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JSON formatter
Pretty-print / minify / validate JSON with error location
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Base64 encode / decode
Convert UTF-8 text to and from Base64, standard or URL-safe
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Regex tester
Live matching, flags, and every capture group listed
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URL encode / decode
Percent-encoding for URLs and query values
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Chinese kinship calculator
Write a chain of relations and get the Chinese term of address
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Temperature converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur
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Data size converter
Convert bytes, bits and both decimal and binary size prefixes
All tools (57)
Encoding
Base64, URL, HTML, Hex, Binary, Unicode and other common encodings
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Base64 encode / decode
Convert UTF-8 text to and from Base64, standard or URL-safe
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URL encode / decode
Percent-encoding for URLs and query values
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HTML entity escape
Convert between raw text and HTML entities (& < > " ')
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Hex ↔ text
Convert UTF-8 text and hex byte sequences both ways
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Binary ↔ text
Convert UTF-8 text and binary (0/1 bit strings)
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Unicode escape
Convert between text and \uXXXX escape sequences (surrogate/emoji safe)
Developer
JSON, XML, regex, JWT, UUID, cron and other everyday helpers
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JSON formatter
Pretty-print / minify / validate JSON with error location
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Regex tester
Live matching, flags, and every capture group listed
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JWT decoder
Split a JWT and decode Header / Payload (no signature check)
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UUID generator
Generate UUID v4 (random) and v7 (time-ordered) in batches
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Cron parser
Compute the next N runs of a standard 5-field cron expression
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XML formatter
Pretty-print / minify / validate XML using the browser parser
Text
Counting, case conversion, line ops, generators, diff
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Character & word counter
Count characters, words, lines, CJK ideographs and UTF-8 bytes
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Case converter
Convert between camelCase, snake_case, kebab-case, PascalCase and more
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Sort lines
Sort text lines by dictionary order, numeric order or length
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Deduplicate lines
Remove duplicate lines, keep first occurrence or count occurrences
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Text diff (by line)
Line-by-line diff between two texts
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Lorem Ipsum generator
Generate paragraphs of Lorem Ipsum placeholder text
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Special symbols
Browse and copy common special characters by category
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URL extractor
Extract HTTP and HTTPS URLs from text
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Email extractor
Extract common-form email addresses from text
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Word frequency
Count occurrences of word and number tokens in text
Network
IP details, HTTP status, MIME types
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IP address lookup
Look up the location, network operator and address type of an IPv4 or IPv6 address
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IP range and CIDR converter
Convert between start–end ranges and CIDR, merge lists and subtract ranges
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HTTP status codes
Reference of HTTP status codes (1xx–5xx)
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MIME type lookup
Common file extensions and their MIME types
Color
Convert and inspect color formats
Hash & crypto
Common hash algorithms and digests
CRC-32Security
Passwords, randomness and secure generators
Finance
Loans, interest and repayment plans
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Currency Converter
Latest reference rates, one-year trends and amount conversion across 154 fiat currencies and 4 precious metals.
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RMB amount in words
Convert between figures and the Chinese capital amount, checked both ways
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Mortgage calculator
Compare monthly payments, total interest and schedules for two repayment methods
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Provident-fund mortgage calculator
Calculate payments and interest with a user-supplied provident-fund loan rate
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Combined mortgage calculator
Combine commercial and provident-fund loan payments and total cost
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Renovation loan calculator
Calculate renovation-loan payments, interest and one-time fees
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Mortgage prepayment calculator
Estimate payment, term and interest savings after an early repayment
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Mortgage rate-change calculator
Compare remaining payments and interest before and after a rate change
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Reverse mortgage payment calculator
Solve for affordable principal or the implied annual rate from a payment
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Home-purchase cost estimator
Total property taxes and cash needed from rates you provide
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Home affordability calculator
Estimate an affordable property price from cash, payment budget and area
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Provident-fund loan limit calculator
Cross-check income, account, property and local loan limits
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Mortgage rate calculator
Convert an LPR reference and basis-point adjustment into a contract rate and payment
Unit conversion
Length, weight, area, volume, temperature and other everyday conversions
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Length converter
Convert one length into 16 metric, imperial and Chinese units at once
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Weight converter
Convert one mass into 14 metric, imperial and Chinese units at once
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Area converter
Convert one area into 14 metric, imperial and East Asian units at once
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Volume converter
Convert one volume into 17 metric, US and imperial units at once
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Temperature converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur
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Speed converter
Convert between m/s, km/h, mph, ft/s, knots and Mach
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Pressure converter
Convert one pressure into 12 units including Pa, bar, atm, psi and mmHg
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Data size converter
Convert bytes, bits and both decimal and binary size prefixes
Reference
Locally bundled code, symbol and size references
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Emoji directory
Browse and copy common emoji by category or by keyword
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US state codes
Postal abbreviations for US states, DC and territories
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Men’s size reference
Common size ranges for coats, shirts, trousers and underwear
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Chinese kinship calculator
Write a chain of relations and get the Chinese term of address