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Tool3M

Free collection of developer and creator efficiency tools.

Convert Format Codec Generate Code Text

Convert

5 Tools

Unix Timestamp Converter

Convert Unix timestamps to readable dates and vice versa. Support for seconds (s), milliseconds (ms), microseconds (μs), and nanoseconds (ns). ### How to use 1. **Timestamp to Date**: Enter a Unix timestamp (e.g., `1710500000`). The tool automatically identifies the precision (s, ms, us, ns) based on the input length. 2. **Date to Timestamp**: Enter a date string (e.g., `2024-03-15 14:30:00`). The tool will generate the corresponding Unix timestamps in all precisions. 3. **Quick Actions**: Use buttons like 'Today 00:00' or 'Now' to quickly set common time points. ### Core Definitions - **Unix Timestamp**: The number of seconds (or milliseconds/microseconds/nanoseconds) that have elapsed since the Unix epoch (January 1st, 1970, at 00:00:00 UTC). - **Precision**: High-frequency systems often use milliseconds (13 digits) or nanoseconds (19 digits) for logging and distributed tracing. ### Cultural Date Formats Date formatting varies globally. We provide the three most common structures: - **ISO (Y-M-D)**: Used internationally and common in East Asia. - **US (M/D/Y)**: Standard in the United States. - **European (D/M/Y)**: Widely used in Europe, South America, and parts of Asia. ### Technical Implementation This tool is built using **React** and the **dayjs** library for high-performance and accurate time manipulation. It handles local browser timezones and UTC offsets seamlessly. ### The Year 2038 Problem (Y2K38) 32-bit Unix systems store time as a signed 32-bit integer. On **January 19, 2038**, these systems will overflow and fail to correctly represent time. This tool supports 64-bit precision to visualize dates far beyond 2038.

Color Converter

Convert color formats between HEX, RGB, HSL, HSV, and CMYK. Includes related color suggestions, code snippets, and a library of common colors. ### How to use 1. Input a color value in any format or use the visual picker. 2. Adjust opacity using the transparency slider. 3. Explore related color schemes: Complementary, Analogous, Triadic, and more. 4. Copy ready-to-use code snippets for CSS, Swift, Java, Android, and Flutter. ### Common Scenarios - Web Development: Converting design colors to RGBA or HSLA for CSS. - Mobile App Design: Generating color code for Android (XML/Java) or iOS (Swift). - Graphic Design: Translating RGB/HEX values to CMYK for print production. ### Data Structure - **HEX/RGBA**: Standard web formats. - **HSV/HSB**: Useful for selecting variations of a base color. - **CMYK**: The subtractive color model used in color printing. ### Principles Uses standard color space transformation algorithms to ensure high accuracy across all supported models.

JSON to CSV

Convert JSON arrays to CSV format easily for use in spreadsheet applications like Excel or Google Sheets. Supports custom delimiters, field selection, and interactive table preview. ### How to use 1. Paste your JSON array into the input field or click 'Demo' to see an example. 2. The tool will automatically extract available fields. You can selectively toggle fields in the settings. 3. Choose your preferred CSV delimiter (comma, semicolon, tab, etc.). 4. Toggle between 'Text View' and 'Table View' to inspect the results. 5. Download the CSV file or copy the text to your clipboard. ### Common Scenarios - Exporting data from an API (JSON) into Excel or Google Sheets (CSV). - Converting database exports for easier analysis in spreadsheet software. - Migrating data between different systems that prefer flat file formats. ### Data Structure - **Input**: An array of objects `[{ "key": "value" }, ...]`. - **Output**: A delimited values string (CSV) where the first line contains keys. ### Principles The tool flattens the JSON structure. It identifies all unique keys across the objects to form columns and then maps each object's values to the corresponding column index. It handles nested objects by flattening them with dot notation.

Image to Base64

Convert images to Base64 strings or Data URIs. Ideal for embedding small images directly into HTML or CSS. ### How to use 1. Upload an image file or drag and drop it into the tool. 2. Select the output format (Data URI, CSS background-image, or raw Base64). 3. Copy the generated string. ### Common Scenarios - Embedding small icons or logos directly into HTML/CSS to reduce HTTP requests. - Sending image data via JSON APIs. - Storing small images in databases as strings. ### Data Structure The result is a long ASCII string. For Data URIs, it includes a prefix like `data:image/png;base64,...`. ### Principles The tool reads the binary data of the image file and uses the Base64 encoding algorithm to represent it using only 64 printable ASCII characters.

Unit Converter

Convert between various units of length, weight, area, and temperature with high precision. ### How to use 1. Select the category of measurement (Length, Weight, Temperature, etc.). 2. Enter the value in the 'From' unit. 3. Select the 'To' unit to see the converted result instantly. ### Common Scenarios - Converting distances between Metric and Imperial systems (e.g., meters to feet). - Converting temperatures for international travel (Celsius to Fahrenheit). - Quick unit adjustments for cooking or engineering tasks. ### Data Structure The tool uses a mapping of base units and conversion factors to perform calculations. ### Principles All units within a category are first converted to a standard base unit and then converted from that base to the target unit using precise multipliers.

Format

2 Tools

JSON Formatter

Format, validate and prettify JSON data online. JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. ### How to use 1. Paste your JSON data into the input field. 2. The tool will automatically format and validate it. 3. Use the 'Indent' options to adjust the appearance. 4. Copy the result or clear the input to start over. ### Common Scenarios - Debugging minified API responses from web services. - Formatting configuration files (like package.json) for readability. - Verifying the syntax of JSON data before using it in code. ### Data Structure & Rules JSON is built on two structures: - **Objects**: A collection of name/value pairs, wrapped in `{}`. - **Arrays**: An ordered list of values, wrapped in `[]`. Values can be strings, numbers, objects, arrays, true, false, or null. ### Conversion Principles The tool uses the built-in `JSON.parse()` to validate the syntax and `JSON.stringify()` with custom indentation logic to reconstruct the data into a clean, readable format.

SQL Formatter

Format and beautify your SQL queries for better readability. Supports various SQL dialects. ### How to use 1. Paste your unformatted or minified SQL query into the editor. 2. Choose your SQL dialect (MySQL, PostgreSQL, T-SQL, etc.) if available. 3. The tool will indent keywords and align clauses for better readability. ### Common Scenarios - Cleaning up complex, nested queries for code review. - Formatting auto-generated SQL from ORMs (like Hibernate or Sequelize). - Debugging long SQL scripts by making the structure clear. ### Data Structure The tool parses the SQL string into tokens (keywords, identifiers, literals, operators) and then reconstructs it. ### Principles It uses a SQL lexer and parser to understand the query structure, then applies rule-based formatting to place keywords on new lines.

Codec

4 Tools

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 back to text. Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. ### How to use 1. Select 'Encode' or 'Decode' mode. 2. Paste your content into the input field. 3. The result is generated instantly in the output field. ### Common Scenarios - Embedding images or fonts directly into CSS/HTML using Data URIs. - Transmitting binary data over systems that only support text-based protocols. - Encoding basic authentication headers for API requests. ### Data Structure Base64 uses a specific alphabet consisting of 64 characters: `A-Z`, `a-z`, `0-9`, `+`, and `/`. The `=` character is used for padding. ### Conversion Principles It works by dividing every 3 bytes (24 bits) of input into 4 groups of 6 bits each. Each 6-bit group is then mapped to one of the 64 characters in the Base64 index table.

URL Encoder/Decoder

Encode or decode URLs to ensure they are safe for the web. URL encoding (Percent-encoding) is a mechanism for encoding information in a Uniform Resource Identifier (URI). Now supports multiple character set encodings like GBK, Big5, and more. ### How to use 1. Enter the URL or string you want to process. 2. Select the character set (default is UTF-8). 3. Choose between 'Encode' to make it URL-safe or 'Decode' to make it human-readable. 4. The result will appear instantly. ### Common Scenarios - Encoding query parameters to prevent broken links. - Decoding complex URLs to understand the passed data. - Handling special characters like spaces, symbols, or non-ASCII characters in web addresses in different encodings. ### Data Structure & Rules URLs use a limited set of ASCII characters. Reserved characters like `?`, `&`, `=`, and `/` have special meanings. Unsafe characters are replaced with `%` followed by their two-digit hexadecimal representation. ### Principles The tool uses `encodeURIComponent` and `decodeURIComponent` for component-level processing, or `encodeURI`/`decodeURI` for full URLs, ensuring compliance with RFC 3986. For non-UTF-8 charsets, it uses `TextDecoder` and custom percent-encoding logic.

Hash Generator

Generate cryptographic hashes for your text. A cryptographic hash function is a mathematical algorithm that maps data of arbitrary size to a bit array of a fixed size. ### How to use 1. Input the text data you want to hash. 2. Select the desired algorithm (MD5, SHA-1, SHA-256, SHA-512, etc.). 3. The resulting hash (checksum) will be calculated and displayed. ### Common Scenarios - Verifying data integrity (checking if a file or string has been altered). - Storing passwords securely (using one-way hashes). - Generating unique finger-prints for content. ### Data Structure A hash is a fixed-length string of characters (usually hexadecimal). Regardless of the input size, the output length remains constant for a specific algorithm. ### Principles Hash functions are designed to be one-way (irreversible) and collision-resistant (different inputs produce different outputs).

HTML Entity Codec

Encode or decode HTML entities in your text. This tool converts special characters into their HTML entity equivalents and vice versa. ### How to use 1. Enter the text containing HTML entities or special characters. 2. Choose 'Encode' to convert characters to entities (e.g., `<` to `<`). 3. Choose 'Decode' to convert entities back to plain text. ### Common Scenarios - Displaying code snippets on web pages without triggering HTML parsing. - Preventing Cross-Site Scripting (XSS) by escaping user input. - Handling special symbols or non-ASCII characters in HTML source code. ### Data Structure HTML entities can be named (like `©`) or numeric (like `©`). They always start with `&` and end with `;`. ### Principles Encoding replaces reserved HTML characters with their corresponding entity strings. Decoding parses these sequences and returns the original character.

Generate

3 Tools

UUID Generator

Generate random UUIDs (version 4) online. A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. ### How to use 1. Choose the number of UUIDs you wish to generate. 2. Select the format (e.g., uppercase/lowercase, with or without hyphens). 3. Click 'Generate' to create new unique identifiers. ### Common Scenarios - Generating unique keys for database records. - Creating session IDs or transaction identifiers in software development. - Mocking data for testing purposes where unique IDs are required. ### Data Structure A UUID is represented as 32 hexadecimal digits, typically displayed in five groups separated by hyphens: `xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx`. ### Principles This tool generates Version 4 UUIDs, which are based on random numbers. It uses a cryptographically strong random number generator to ensure a negligible probability of duplication.

Password Generator

Generate secure, random passwords with customizable options to protect your online accounts. ### How to use 1. Set the desired password length. 2. Toggle options for including Uppercase letters, Lowercase letters, Numbers, and Symbols. 3. Click 'Generate' to create one or more secure passwords. ### Common Scenarios - Creating strong, unique passwords for new online accounts. - Generating temporary credentials for users or API keys. - Improving personal security by replacing weak, reused passwords. ### Data Structure The output is a string of characters randomly selected from the allowed character sets (alphabet, digits, special characters). ### Principles It uses a cryptographically secure pseudo-random number generator (CSPRNG) to pick characters, ensuring that the generated passwords are unpredictable.

Lorem Ipsum Generator

Generate placeholder text for your designs and layouts. Mimics the structure of natural language without distracting content. ### How to use 1. Choose the amount of text needed (paragraphs, sentences, or words). 2. Specify the quantity. 3. Select whether to start with the standard 'Lorem ipsum dolor sit amet...'. 4. Copy the generated placeholder text. ### Common Scenarios - Web design: Filling layouts with text to visualize typography and spacing. - UI/UX prototyping: Creating mockups without focusing on actual copy. - Testing text overflow and container constraints in development. ### Data Structure The output is a series of strings organized into words, sentences, or paragraphs. ### Principles It uses a predefined dictionary of Latin-like words and randomly assembles them into grammatically plausible (but meaningless) structures.

Code

2 Tools

Regex Tester

Test and debug regular expressions with real-time highlighting and match details. ### How to use 1. Enter your Regular Expression (pattern). 2. Provide a sample text (test string). 3. Select flags like 'g' (global), 'i' (ignore case), or 'm' (multiline). 4. Matches will be highlighted in the test string. ### Common Scenarios - Validating input formats (emails, phone numbers, etc.). - Extracting specific data from large text blocks using groups. - Testing complex find-and-replace patterns for coding. ### Data Structure The input consists of a Pattern string and a Test string. The output includes match indices and captured groups. ### Principles The tool uses the native JavaScript `RegExp` engine. It visualizes the matching process by scanning the test string and applying the pattern logic to find all occurrences.

Code Minifier

Minify and compress your JavaScript and CSS code to reduce file size and improve loading speed. ### How to use 1. Select the language (JavaScript, CSS, or HTML). 2. Paste your source code into the input field. 3. Click 'Minify' to remove unnecessary characters. 4. Download or copy the compact version. ### Common Scenarios - Reducing file size for faster web page loading in production. - Obfuscating basic logic to make it harder to read. - Preparing assets for deployment in resource-constrained environments. ### Data Structure The tool processes code as a syntax tree or a stream of tokens. ### Principles Minification removes whitespace, comments, and newlines. Advanced minification may also shorten variable names and optimize expressions.

Text

3 Tools

Text Diff

Compare two texts and see the differences side by side. Our tool uses efficient diffing algorithms to highlight additions, deletions, and modifications. ### How to use 1. Enter the original text in the left (or top) field. 2. Enter the modified text in the right (or bottom) field. 3. The differences will be highlighted in real-time or upon clicking 'Compare'. ### Common Scenarios - Code review: Comparing two versions of a code snippet. - Document tracking: Seeing what changed between two drafts of a text. - Configuration audit: Identifying changes in server or application configs. ### Data Structure The tool treats input as sequential strings of characters or lines. It maps these sequences to identify the longest common sub-sequences. ### Conversion Principles Based on the Myers' diff algorithm or similar Longest Common Subsequence (LCS) methods, the tool calculates the minimal set of edits (insertions and deletions) required to transform the original text into the modified version.

Word Counter

Count words, characters, lines and paragraphs in your text accurately and instantly. ### How to use 1. Paste or type your text into the input area. 2. Statistics for words, characters, lines, and paragraphs will update in real-time. 3. Check detailed metrics like reading time or character count without spaces. ### Common Scenarios - Writing articles or essays with specific word limit requirements. - SEO optimization: Checking the length of meta descriptions and titles. - Social media: Ensuring posts stay within character limits (e.g., Twitter). ### Data Structure The tool processes the input as a string and breaks it down into segments based on whitespace, punctuation, and newline characters. ### Principles Word counting is performed using regular expressions to identify word boundaries. Character counts include or exclude whitespace based on your selection. Paragraphs are detected by double newline sequences.

Case Converter

Convert text case between various formats including uppercase, lowercase, camelCase, snake_case, and more. ### How to use 1. Input your text into the field. 2. Select the target case: UPPERCASE, lowercase, Capitalize Each Word, Sentence case, camelCase, snake_case, or kebab-case. 3. The converted text is ready to be copied. ### Common Scenarios - Formatting variable names for programming (e.g., switching from snake_case to camelCase). - Standardizing titles or headers in documents. - Cleaning up mixed-case data for better presentation. ### Data Structure The tool treats the input as a string and applies transformation rules based on word boundaries (spaces, hyphens, underscores). ### Principles It identifies words using delimiters and then maps each character to its uppercase or lowercase equivalent according to Unicode standards.

Security

1 Tools

JWT Decoder

Decode JSON Web Tokens (JWT) to see header and payload content. Helpful for debugging authentication tokens. ### How to use 1. Paste your encoded JSON Web Token into the input. 2. The tool will split the token into Header, Payload, and Signature. 3. The JSON content of the Header and Payload is automatically formatted for reading. ### Common Scenarios - Debugging authentication issues by checking token expiration (`exp`). - Inspecting user roles or permissions embedded in the token payload. - Verifying the algorithm used for signing the token. ### Data Structure A JWT consists of three parts separated by dots (`.`): `Base64Url(Header).Base64Url(Payload).Signature`. ### Principles It decodes the first two parts of the token from Base64Url to a JSON string. Note: This tool is for inspection only and does not verify the signature's validity without a secret key.

Dev

1 Tools

Cron Parser

Parse and explain Cron expressions in human-readable format. Predict upcoming execution times. ### How to use 1. Input a standard 5 or 6-field Cron expression (e.g., `0 * * * *`). 2. The tool will break down each field (minutes, hours, days, etc.). 3. A human-readable description and the next execution times will be displayed. ### Common Scenarios - Verifying that a scheduled task will run at the intended time. - Understanding complex Cron schedules inherited from older systems. - Designing new schedules for background jobs or backups. ### Data Structure A Cron expression is a string of fields: `minute hour day-of-month month day-of-week`. ### Principles The parser interprets each field's wildcards (`*`), ranges (`-`), lists (`,`), and intervals (`/`) to calculate matching timestamps.

About Tool3M Online Toolbox

Free online JSON formatter, diff checker, base64 encoder, and more.

Our Mission

Tool3M is committed to providing the fastest, simplest, and most secure online tools for developers, designers, and office workers worldwide. We believe great tools should be accessible without tedious installation or registration.

Privacy & Security

Your privacy is our top priority. Most of our tools execute entirely locally in your browser, meaning your data never leaves your computer. We do not store your input, ensuring your sensitive information remains safe.

Frequently Asked Questions

What is Tool3M?

Tool3M is a free collection of online tools designed for developers and creators, offering high-efficiency tools like JSON formatting, text comparison, and encoding/decoding.

Are Tool3M tools free to use?

Yes, all tools on Tool3M are completely free to use without any registration required.

Is my data secure?

Most Tool3M tools run locally in your browser, meaning your data is never uploaded to our servers, ensuring maximum privacy and security.