Developer Tools16
ID Collision Probability Calculator
Estimate the probability of a collision when generating random UUIDs, ULIDs, or short codes, and find how many IDs you can safely generate before risk grows.
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CSS clamp() Fluid Typography Calculator
Generate a fluid CSS clamp() font-size declaration that scales smoothly between two viewport widths, with rem conversion and a breakpoint preview table.
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HTTP Cache-Control Header Calculator
Build a valid HTTP Cache-Control header from max-age, s-maxage and revalidation options, and see a plain-English explanation of what each directive does.
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CSS Specificity Calculator
Calculate the CSS specificity of multiple selectors at once. Compare ID, class, and element weights side by side to see exactly which style rule wins.
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IP Subnet Calculator
Calculate the network address, broadcast address, subnet mask, wildcard mask, and usable host range for any IPv4 address and CIDR prefix, instantly and free.
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CSS Unit Converter
Convert between CSS units like px, em, rem, pt, pc, in, cm, mm, vw, and vh instantly. See every unit at once for accurate, ready-to-use stylesheet values.
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Data Storage Unit Converter
Convert data sizes between bits, bytes, KB/MB/GB/TB/PB and their binary KiB/MiB/GiB/TiB/PiB equivalents, with a full breakdown table across every unit at once.
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Color Format Converter
Convert any color between HEX, RGB, HSL, and CMYK formats instantly, and see its complementary color, brightness level, and the best-matching text color.
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JWT Decoder
Decode a JSON Web Token to inspect its header, payload claims, signing algorithm, and expiry status - a handy JWT debugging tool for developers and API testers.
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Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back, in seconds or milliseconds, with day of week, ISO 8601 format, and relative time shown instantly.
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QR Code Generator
Turn any URL, message, or piece of text into a scannable QR code image you can download and share.
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Password Strength Checker
Estimate your password's entropy, see which security criteria it meets, and find out how long it would take to crack under different attack scenarios.
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