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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.

Unit Converter Online
Unit converter online supports the conversion of multiple units such as length, weight, area, volume data.

Make Basic Radar Chart Online
Make radar charts online for free. Make radar chart online, support filling in data online or uploading excel files, and support exporting the generated radar chart to JPG, PNG and PDF files.

Schulte Table Attention Test Online
Online Schulte table attention test, generate a table with 25 small squares, shuffle the numbers from 1 to 25, and fill them in the table for attention testing or training. The generated Schulte table supports downloading to the local location.

Braille Translator Online
Online braille translator, supporting text to braille and braille to text conversion. Braille specifications support Mainland Chinese Braille in Chinese Mainland, double-phonic Braille in Chinese Mainland, and various English Braille.

File Hash Calculation
Calculate the MD5, SHA1, sha256, SHA512, sha3-256 and sha3-512 hash values of the file. The hash result is expressed as a hexadecimal string.

Make Basic Sunburst Chart Online
Make sunburst charts online for free. Make sunburst chart online, support filling in data online or uploading excel files, and support exporting the generated sunburst chart to JPG, PNG and PDF files.

Free Image Editor Online
Free Image Editor Online tool is free online image editor using HTML5. Edit, adjust your images, add effects online in your browser, without installing anything...

JavaScript Object to JSON Online
Online JavaScript object to JSON tool, supporting the conversion of JavaScript objects and JSON data, and the converted results can be downloaded locally.

CSS Selectors Reference
The CSS selector defines the range of elements that CSS rules apply to. This tool provides a reference manual for CSS universal selectors, type selectors, class selectors, id selectors, combination selectors, attribute selectors, pseudo class selectors, and so on. It also shows the CSS Level that this selector was introduced into.
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Pi Digits Query Online
Online PI(π) query tool, supports querying the PI value of the specified number of digits after the decimal point, and supports querying up to 1,000,000 (one million) digits. The result can be copied and downloaded.

Subtitle Format Converter Online
Online subtitle format conversion, support subtitle format lrc,srt,vtt,sbv,ass,ssa,sub,scc,stl,ttml,itt conversion, support batch conversion. Support to set character set encoding and other parameters for subtitle format conversion.

Calculator Online
Online calculator. Enter a mathematical calculation expression and calculate the result of the expression. It supports various functions such as arithmetic functions, trigonometric functions, matrix functions, probability functions, relational functions, and statistical functions. It also supports the calculation of high precision floating - point numbers, large integers, complex numbers, and matrices.

Modify Image DPI Online
Online modify image DPI tool, support single or batch modify image DPI (dots per inch), support modify jpg, jpeg, png, bmp, webp format images.

OTP Code Generator Online
Online OTP Password Generator, supports generating TOTP(Time-Based One-Time Password) and HOTP(HMAC-based One-time Password) passwords. The generated TOTP passwords can be imported into Google Authenticator and Microsoft Authenticator.

Data Masking Online
Online data masking tool that supports opening txt, csv, json, and excel data to perform hash masking, mask masking, replacement masking, transformation masking, encryption masking, and shuffling masking on sensitive data. The desensitized data can be downloaded locally.

KMAC Calculate and Verify Online
Online KMAC (KECCAK Message Authentication Code) calculation and verification tool, supporting online calculation and verification of KMAC. Support input data and keys, select KMAC-128 or KMAC-256 algorithm, set output bit length and other parameters.

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.