Random Number Generator Online

The online random number generator supports the generation of random integer values and random floating-point values. When unique is specified, all generated random numbers are not repeated.

Countdown Timer Online

Countdown timer online supports online countdown. After the countdown, you can set the sound of playing alarm.

Stopwatch Online

Online stopwatch timer supports online stopwatch timing, millisecond time, pause, mark and download functions.

CRC Calculation Online

The cyclic redundancy check calculation function of CRC8, CRC16, CRC32 and crc64 is provided to detect or verify possible errors after data transmission or saving. It uses the principle of division and remainder to detect errors. When calculating, pay attention to different algorithms (including polynomial, initial value, whether to reverse, etc.), and the calculation results will be different.

Random Password/String Generator

Online random password generator, random string generator. You can generate passwords or strings of specified length that meet specific strength requirements. The generation tool can customize generation rules, such as including specific characters and excluding specific characters.

Digital Binary Converter

Support float and binary / hexadecimal conversion, double and binary / hexadecimal conversion, short and binary / hexadecimal conversion, int and binary / hexadecimal conversion, long and binary / hexadecimal conversion. The byte order needs to be selected during conversion, and the default is large end order. Big end mode means that the high byte of data is saved in the low address of memory. Small end mode means that the high byte of data is saved in the high address of memory.

XPath Tester Online

Online free XPath testing tool, input XML data or open XML file, and use the filled XPath expression to traverse XML data. This tool supports XML namespaces and downloading query results as files.

IPv6 Address Compress and Expand

Online IPv6 address compress and expand tool that supports the compression and expansion of 0 in IPv6 addresses.

Flip Coin Online

Online coin flip tool, randomly flip coins to see if the result is heads or tails.

Common MIME Type List

The list of common MIME types lists the common MIME types, their corresponding file extensions and document types.

Chmod Permission Generator Online

Online linux chmod permission generator, using a visual ui interface to generate read, write, and execute permissions for owners, groups, and other users, supporting the setting of SUID, SGID, and Sticky special permissions.

CSS Beautify and Minify

CSS beautify tools and minify tools online provide one click CSS beautification function and one click CSS minimization compression function.

BCrypt Derive Key and Verify Online

Online BCrypt derived key and verification tool, using the bcrypt Password Based Key Derivation Function to derive keys based on passwords and random salt, supporting custom cost and other parameters. Support online verification of BCrypt derived keys.

SCrypt Derive Key and Verify Online

Online SCrypt derived key and verification tool, using scrypt Password Based Key Derivation Function to derive keys based on password and random salt, supporting custom block size, CPU/memory cost, parallelization, derived key length and other parameters. Support online verification of SCrypt derived keys.

Chinese Idiom Fill Online

Online chinese idiom fill in the blank tool, fill in the text of chinese idioms at any position, and search for chinese idioms. Support filling in one or more words.

HKDF Derive Key and Verify Online

Online HKDF derived key and verification tool, using the HMAC-based Extract-and-Expand Key Derivation Function algorithm, derives keys based on the input key and random salt, supports custom hash functions, derived key length, carried information and other parameters. Support online verification of HKDF derived keys.

PBKDF2 Derive Key and Verify Online

Online PBKDF2 derived key and verification tool, using Password Based Key Derivation Function 2 to export keys based on passwords and random salt, supporting custom hash functions, derived key length, iteration times and other parameters. Support online verification of PBKDF2 derived keys.

Keyboard Event Information Online

Online keyboard key information tool, displaying key, code, keycode, location, modifiers and other key information of keyboard key events in web pages, and providing a key information query comparison table.

Child Height Calculator Online

Online height calculator for children, predicting and calculating their height based on multiple parameters, and providing height standard references for different age groups.

ULID Generator Online

Online ULID generator, supports batch generation of ULIDs, and the generated ULIDs can be downloaded locally.

UUID Format Convert and Verify Online

Online UUID conversion and verification tool, supporting the conversion of UUIDs in string, hex, binary, and base64 formats. Support verifying whether the input string is a valid UUID and the corresponding UUID version.

Shield Badge Generator Online

An online tool for creating shield badges, which supports setting parameters such as label, color, style, and adding logos. It also supports downloading as SVG, PNG, JPEG, or WebP images.

Template Data Generator Online

An online template data generation tool that generates string/JSON/binary HEX format data based on a specified format or protocol. The data field supports randomly generating integers, floating-point numbers, strings, and supports field references and JavaScript programming calculations.

Make Danmaku Online

Online handheld danmaku tool, supporting online generation of handheld danmaku and scrolling LED text. Support setting parameters such as text font, text color, text size, background color, background image, scrolling speed, etc. Support gradient color text, blinking text and other effects.