Online Calculate Tools
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Popular Tools

These are the most frequently used tools
CRC Calculator
Online CRC calculator supporting all standard algorithms: CRC-8, CRC-16, CRC-32, CRC-CCITT, MODBUS and more. Professional-grade error detection with custom polynomials.
Modbus RTU
Professional Modbus RTU online tool with three core functions: command generation, response data generation, and data analysis. Supports multiple data types (UINT16/INT16/UINT32/INT32/FLOAT32) and byte orders (ABCD/DCBA/BADC/CDAB).
Modbus Debug
Modbus RTU online debugging tool, supporting direct serial port connection in browser, real-time data collection, multi-format data parsing (binary/text), data visualization and export. Supports various data types (UINT16/INT16/UINT32/INT32/FLOAT32) and byte orders (ABCD/DCBA/BADC/CDAB), can be used with Modbus RTU tools for complete device debugging process.
Modbus ASCII
Modbus ASCII online tool supporting ASCII frame parsing, command generation, response data/frame generation and LRC checking. Supports multiple data types (UINT16/INT16/UINT32/INT32/FLOAT32) and byte orders (ABCD/DCBA/BADC/CDAB), one-click generation of standard Modbus ASCII commands.
Time Converter
Online time converter for timestamps, timezones, and multiple time formats. Convert between Unix timestamp, ISO 8601, RFC 3339 and custom formats.
Time Calculator
Calculate time intervals, date differences, and perform time arithmetic. Add or subtract days, hours, minutes with support for business days.
Satellite Time Converter
Professional satellite time system converter supporting GPS Time, BeiDou Time (BDT), GLONASS Time. Convert between different GNSS time systems.
AES
Online AES encryption tool supporting 128/192/256-bit keys, multiple modes (CBC/ECB/CFB/OFB/CTR/GCM), and various padding methods. Professional cryptography calculator.

Checksum Tools

Various checksum algorithm tools including XOR, LRC, CRC checksums
CRC Calculator
Online CRC calculator supporting all standard algorithms: CRC-8, CRC-16, CRC-32, CRC-CCITT, MODBUS and more. Professional-grade error detection with custom polynomials.
Checksum Calculator
Online checksum calculator. Calculate checksums by summing bytes for data verification. Simple and fast checksum calculation tool.
BCC/XOR
Online BCC (Block Check Character) and XOR checksum calculator. Calculate BCC checksums for data verification and error detection.
LRC
Online LRC (Longitudinal Redundancy Check) calculator. Calculate LRC checksum for data verification and error detection.
Adler32 Checksum
Online Adler32 checksum calculator and hash generator. Fast and reliable data integrity verification tool with RFC 1950 compliance.
Parity Check
Online parity calculator for odd and even parity checking. Calculate parity bits for error detection in data transmission.
Fletcher Checksum
Online Fletcher checksum calculator (16-bit and 32-bit). Fast and reliable error detection algorithm for data integrity verification.

Modbus Tools

Collection of various modbus protocol tools
Modbus RTU
Professional Modbus RTU online tool with three core functions: command generation, response data generation, and data analysis. Supports multiple data types (UINT16/INT16/UINT32/INT32/FLOAT32) and byte orders (ABCD/DCBA/BADC/CDAB).
Modbus Debug
Modbus RTU online debugging tool, supporting direct serial port connection in browser, real-time data collection, multi-format data parsing (binary/text), data visualization and export. Supports various data types (UINT16/INT16/UINT32/INT32/FLOAT32) and byte orders (ABCD/DCBA/BADC/CDAB), can be used with Modbus RTU tools for complete device debugging process.
Modbus ASCII
Modbus ASCII online tool supporting ASCII frame parsing, command generation, response data/frame generation and LRC checking. Supports multiple data types (UINT16/INT16/UINT32/INT32/FLOAT32) and byte orders (ABCD/DCBA/BADC/CDAB), one-click generation of standard Modbus ASCII commands.

Time Tools

Collection of time conversion, calculation, and processing tools
Time Converter
Online time converter for timestamps, timezones, and multiple time formats. Convert between Unix timestamp, ISO 8601, RFC 3339 and custom formats.
Time Calculator
Calculate time intervals, date differences, and perform time arithmetic. Add or subtract days, hours, minutes with support for business days.
Batch Time Converter
Convert multiple time formats in batch. Import/export time data with support for CSV, Excel, and custom formats.
Satellite Time Converter
Professional satellite time system converter supporting GPS Time, BeiDou Time (BDT), GLONASS Time. Convert between different GNSS time systems.
UTC to GPS Time
Online UTC to GPS time converter tool, supports Unix timestamp and datetime to GPS week number and time-of-week seconds, with leap second offset calculation.
Cron Expression Generator
Free online Cron expression generator supporting Linux, Spring, Quartz and other formats. Provides visual configuration, expression validation, execution time preview, and detailed tutorials. Perfect for scheduling tasks and system configuration management.

Encryption Tools

Collection of various encryption and decryption tools
Base64
Online Base64 encoding and decoding tool. Convert text and binary data to and from Base64 format. Support for UTF-8 and multiple character encodings.
AES
Online AES encryption tool supporting 128/192/256-bit keys, multiple modes (CBC/ECB/CFB/OFB/CTR/GCM), and various padding methods. Professional cryptography calculator.
SM4
Online SM4 block cipher encryption tool. Chinese national standard symmetric encryption algorithm with multiple operation modes.
RSA
Online RSA encryption and decryption tool. Support 512/1024/2048/4096-bit keys, PKCS1/OAEP/NONE padding, PEM/HEX formats. Professional cryptography calculator.
SM2
Online SM2 public key cryptography tool. Chinese national standard encryption algorithm for digital signatures and key exchange.
Morse Code
Online Morse code converter. Translate text to Morse code and vice versa. Support for letters, numbers, punctuation with audio playback.

Hash Tools

Collection of various hash algorithm tools
Hash Generator
Online hash calculator supporting MD5, SHA-1, SHA-2, SHA-3, RIPEMD160. Generate hash values for text and files with multiple output formats.
SM3
Online SM3 hash calculator. Chinese national standard cryptographic hash algorithm (GB/T 32905-2016).

HMAC Tools

Keyed-Hash Message Authentication Code Tools
HMAC Generator
Online HMAC calculator supporting MD5, SHA-1, SHA-2, SHA-3, RIPEMD160. Generate message authentication codes with custom keys.

Format Tools

Collection of data formatting tools
JSON Formatter
Online JSON formatter, validator and beautifier with syntax highlighting. Format, minify, and validate JSON data with error detection and tree view support.

Unit Converter

Collection of unit conversion tools, supporting length, weight, area and more
Angle Conversion
Online angle unit converter that supports precise conversion between degrees, radians, percent and more with professional results and reference knowledge.
Weight Conversion
Online weight unit converter that supports precise conversion between over 40 weight units including grams, kilograms, ounces, pounds, tons, stones and more with professional results and reference knowledge.
Length Converter
Online length unit converter tool, supporting converter between meters, centimeters, millimeters, kilometers, inches, feet, yards, miles and other units, accurate and convenient.
Area Conversion
Online area unit converter that supports precise conversion between square meters, square kilometers, hectares, acres, square feet and more with professional results and reference knowledge.
Volume Conversion
Online volume unit converter that supports precise conversion between cubic meters, liters, cubic centimeters, gallons, cubic feet and more with professional results and reference knowledge.
Speed Conversion
Online speed unit converter for precise conversion between meters per second, kilometers per hour, miles per hour, knots, Mach and more with professional results and reference knowledge.
Temperature Conversion
Online temperature unit converter that supports precise conversion between Celsius, Fahrenheit, Kelvin, Rankine and other temperature scales, providing professional results and reference knowledge.
Time Conversion
Online time unit converter that supports precise conversion between seconds, minutes, hours, days, weeks, months, years and more, providing professional results and reference knowledge.
Energy Conversion
Online energy unit converter that supports precise conversion between joules, calories, kilowatt-hours, BTU and more energy units, providing professional results and reference knowledge.

Design Tools

Professional design tool collection including aspect ratio calculation, color processing, dimension conversion and other essential tools for designers
Aspect Ratio Calculator
Online aspect ratio calculator. Helps you calculate and adjust the aspect ratios of images and videos, resize while maintaining aspect ratio, supports common ratio presets.

Number Base Tools

Number base conversion tools collection, supports conversion between binary, octal, decimal, hexadecimal and other numeral systems
Base Converter
Online number base conversion tool. Supports conversion between any bases from 2 to 36, including binary, octal, decimal, hexadecimal. Perfect for programmers and students.

Encoding Tools

Collection of text and data encoding and decoding tools for various formats
URL Encoder/Decoder
Online URL encoding and decoding tool. Convert text to URL-safe format using percent-encoding (encodeURIComponent/encodeURI). Support UTF-8 and multiple formats.
HTML Encoder
Online HTML entity encoding and decoding tool. Convert special characters to HTML entities and vice versa. Support named, decimal, and hexadecimal entity formats.
UTF-8
Online UTF-8 encoding and decoding tool. Convert text to UTF-8 hex byte sequence and back. Supports custom delimiters.
ASCII
Online ASCII encoding and decoding tool. Convert characters to ASCII decimal values and back. Supports full ASCII range.
Unicode Encoder
Online Unicode encoding and decoding tool. Convert text to Unicode escape sequences (\uXXXX) and code points. Support multiple Unicode formats.
Hex Encoder
Online hexadecimal encoding and decoding tool. Convert text to hexadecimal format and vice versa. Support multiple output formats.
Octal
Online Octal encoding and decoding tool. Convert characters to Octal byte values and back. Supports standard Octal representation.
Binary Encoder
Online binary encoding and decoding tool. Convert text to binary format (0s and 1s) and vice versa. Support multiple output formats.
Base16 Encoder
Online Base16 encoding and decoding tool. Standard hexadecimal encoding per RFC 4648.
Base32 Encoder
Online Base32 encoding and decoding tool. Convert data to Base32 format following RFC 4648 standard. Support standard and hex variants.
Base58 Encoder
Online Base58 encoding and decoding tool. Convert data to Base58 format used in Bitcoin and other cryptocurrencies.
Base85 Encoder
Online Base85/Ascii85 encoding and decoding tool. Efficient binary-to-text encoding, more compact than Base64.
Base91 Encoder
Online Base91 encoding and decoding tool. Most efficient ASCII printable character encoding with 89% efficiency.
Punycode Encoder
Online Punycode encoding and decoding tool. Convert internationalized domain names (IDN) to ASCII-compatible encoding.
QP Encoder
Online Quoted-Printable encoding and decoding tool. MIME standard content transfer encoding for email.
UUEncode
Online UUEncode encoding and decoding tool. Classic binary-to-text encoding for file transfers.
GBK/UTF-8 Converter
Online GBK and UTF-8 encoding converter. Convert between Simplified Chinese GBK and Unicode UTF-8 encodings.
Big5/UTF-8 Converter
Online Big5 and UTF-8 encoding converter. Convert between Traditional Chinese Big5 and Unicode UTF-8 encodings.
ISO-8859 Converter
Online ISO-8859 series encoding converter. Support Latin-1 to Latin-16 and other Western European encodings.
Shift-JIS Converter
Online Shift-JIS encoding converter. Convert between Japanese Shift-JIS and UTF-8 encodings.
EUC-JP Converter
Online EUC-JP encoding converter. Convert between Japanese EUC-JP and UTF-8 encodings.
EUC-KR Converter
Online EUC-KR encoding converter. Convert between Korean EUC-KR and UTF-8 encodings.
Charset Detector
Online character encoding detection tool. Automatically detect text encoding type with confidence scores.
Online Calculator Toolbox | Free Online Tools Collection