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.

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.

Countdown Timer Online

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

Shelf Life Calculator Online

Shelf-life calculator online, input the production date, shelf-life duration, calculate the expiration time of the shelf-life of commodities, food, drugs and other items, and whether it expires.

Convert JSON to Excel Online

Online JSON to Excel tool, input or open JSON data, convert it into Excel or CSV files, and the converted Excel and CSV files can be downloaded locally.

Surface Area Calculator Online

Online surface area calculator, supporting the calculation of surface areas for dozens of geometric shapes such as rectangles, cubes, cylinders, cones, and triangular cones, and displaying corresponding surface area calculation formulas.

String Unicode Converter Online

The string unicode converter tool online supports the mutual conversion of string and unicode code point. The conversion supports setting whether to keep ASCII characters and processing multi byte unicode code point.

View Certificates Online

Online certificate viewing tool, open the SSL certificate in PEM or DER format, view the certificate's common name, key algorithm, validity time, certificate fingerprint, alternative name, and other information. This tool also supports viewing information about certificate chains.

Make Funnel Chart Online

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

Common Ports And Protocols List

A complete list of common ports and protocols online, listing common port numbers, protocols used, service names, service descriptions and other information.

Base Station Coordinate Calculation Online

Online base station coordinate calculation tool: input the geocentric-fixed coordinate XYZ of the rover station or the geodetic coordinate LBH of the rover station, input the ENU coordinate of the rover station relative to the base station, and calculate the XYZ or LBH coordinate of the base station. This tool supports batch calculation and multiple ellipsoids.

ChaCha20 Encrypt and Decrypt Online

Online ChaCha20 Encryption and Decryption Tool, supporting ChaCha20, XChaCha20, ChaCha20-Poly1305, and XChaCha20-Poly1305 algorithms for encryption and decryption, with input data formats including string, hex, and base64, and the ability to select from multiple character sets.

Information Entropy Calculator Online

The online information entropy (Shannon entropy) calculator supports calculating the entropy of binary data, text data, and probability distributions, and supports setting the logarithmic base to 2, e, and 10. Support setting result precision.

Protocol Buffers Encode and Decode Online

Online Protocol Buffer Encoding and Decoding Tool, supporting online decoding of protocol buffer data and online encoding of protocol buffer data. Supports opening multiple proto definition files and decoding and encoding multiple messages.

Geohash Encode Decode Online

Online Geohash encoding and decoding tool, supports Geohash encoding and decoding of latitude and longitude positions, supports querying all coordinate points within a specified radius of the center point, and supports querying the closest coordinate point to the center point.

BaseN Encode and Decode Online

Online BaseN encoding and decoding tool, supporting BaseN encoding and decoding of data such as string, hex, base64, files, etc., supporting algorithms such as base2, base8, base16, base32, base64, base58, base85, base91, base100, etc. This tool also supports custom algorithms.

MessagePack and JSON Converter Online

Online Message Pack and JSON conversion tool, supporting the conversion between binary data in Message Pack format and data in JSON text format. Message Pack data supports input formats such as hex, base64, byte arrays, etc.

Fetal Weight Calculator Online

Online fetal weight calculator predicts and calculates fetal weight based on parameters such as uterine height, abdominal circumference, biparietal diameter, and femur length. Support viewing the distribution of fetal weight, biparietal diameter, abdominal circumference, femur length, and other parameters at different weeks.

ABC Music Notation Editor Online

Online ABC score editor, using ABC notation method to edit scores, supports real-time preview of generated staff, and supports downloading as MIDI and WAV files.

Nano ID Generator Online

Online Nano ID generator, supports batch generation of Nano IDs, supports custom alphabet, and custom Nano ID length.

Mermaid Chart Editor Online

Online Mermaid Chart Editor, supports real-time input and preview of text generated charts in Mermaid syntax format, and supports downloading charts in SVG, PNG, JPEG, and WebP formats.

NMEA-0183 Protocol Analysis Online

Online NMEA-0183 protocol parsing tool, supports parsing dozens of messages including NMEA-0183 DTM, GBS, GGA, GLL, GNS, GRS, GSA, GST, GSV, THS, RMC, ROT, VTG, ZDA, etc., and supports NMEA-0183 checksum generation.

SM2 Signature and Verification Online

Online SM2 signature and verification tool, supporting signature generation and verification functions for SM2 algorithms.