String obfuscator

Obfuscate a string (like a secret, an IBAN, or a token) to make it shareable and identifiable without revealing its content.

Enable JavaScript to use the interactive tool. The guide below explains how it works.

String Obfuscator

What it does

The String Obfuscator is a visual utility designed to mask sensitive information while preserving the general structure or a "hint" of the original content. It allows you to specify how many characters at the beginning and end of a string should remain visible, replacing everything else with dots. It also includes an option to preserve spaces, which is useful for obfuscating sentences or phrases while maintaining their layout.

Why someone uses it

Privacy in Documentation: Showing examples of API keys, tokens, or passwords in guides without revealing actual secrets.
Data Masking: Displaying partial information in admin dashboards (e.g., "Email: jo****@example.com") to protect user privacy.
Screenshots & Presentations: Quickly hiding personal or sensitive data in a UI before taking a screenshot for a public demo.
Log Cleaning: Sanitizing data before pasting it into a bug report or a public forum.

Step-by-step instructions

Input String: Type or paste the text you want to hide into the String to obfuscate field.
Set Visibility:
- Adjust Keep first to set how many characters stay visible at the start.
- Adjust Keep last to set how many characters stay visible at the end.
Toggle Spaces: Use the Keep spaces switch to decide if space characters should be replaced or left alone.
Copy Result: The obfuscated text appears in the card below. Click the copy icon to save it.

Examples

API Key: sk-live-51Mz...92j (Keep first 7, Keep last 3) -> sk-live................92j.
Full Name: Alexander Hamilton (Keep first 1, Keep last 1, Keep spaces ON) -> A........ H.......n.
Long Sentence: My secret password (Keep first 2, Keep last 2, Keep spaces OFF) -> My................rd.

FAQs

Is this a form of encryption? No. Obfuscation is a "one-way" visual transformation. There is no way to "de-obfuscate" the result back into the original string. It is for display purposes only.
Should I use this to store passwords? Absolutely not. Passwords should be hashed using tools like Bcrypt. This tool is for making data unreadable to human eyes on a screen.
Can I choose the masking character? Currently, the tool uses dots (.) as they provide a clean and predictable visual width.

Common mistakes

Revealing too much: For short strings, keeping 4 characters at both ends might reveal the entire string or enough of it to be easily guessed.
Using for Security: Confusing visual obfuscation with actual data security. Always assume the obfuscated string carries no information about the original other than its approximate length.

Use cases

Software Tutorials: Creating "Before and After" examples for configuration files.
Customer Support: Masking a customer's physical address or phone number in a support ticket screenshot.
Mockups: Generating realistic-looking "protected" data for UI prototypes.

Related tools

Bcrypt: Use this for securely hashing passwords before storing them in a database.
Hash Text: For creating a unique "fingerprint" of a string (MD5, SHA-256) that cannot be reversed.
Slugify String: For cleaning up strings to be used in URLs, which is another form of string transformation.

All tools

Ascii text drawer - Ascii text drawer - free online tool.

Base64 file converter - Convert a string, file, or image into its base64 representation.

Base64 string encoder/decoder - Simply encode and decode strings into their base64 representation.

Basic auth generator - Generate a base64 basic auth header from a username and password.

Bcrypt - Hash and compare text string using bcrypt. Bcrypt is a password-hashing function based on the Blowfish cipher.

Benchmark builder - Easily compare execution time of tasks with this very simple online benchmark builder.

BIP39 passphrase generator - Generate a BIP39 passphrase from an existing or random mnemonic, or get the mnemonic from the passphrase.

Camera recorder - Take a picture or record a video from your webcam or camera.

Case converter - Transform the case of a string and choose between different formats

Chmod calculator - Compute your chmod permissions and commands with this online chmod calculator.

Chronometer - Monitor the duration of a thing. Basically a chronometer with simple chronometer features.

Color converter - Convert color between the different formats (hex, rgb, hsl and css name)

Crontab generator - Validate and generate crontab and get the human-readable description of the cron schedule.

Date-time converter - Convert date and time into the various different formats

Device information - Get information about your current device (screen size, pixel-ratio, user agent, ...)

Docker run to Docker compose converter - Transforms "docker run" commands into docker-compose files!

Email normalizer - Email normalizer - free online tool.

Emoji picker - Copy and paste emojis easily and get the unicode and code points value of each emoji.

Encode/decode URL-formatted strings - Encode text to URL-encoded format (also known as "percent-encoded"), or decode from it.

Encrypt / decrypt text - Encrypt clear text and decrypt ciphertext using crypto algorithms like AES, TripleDES, Rabbit or RC4.

Escape HTML entities - Escape or unescape HTML entities (replace characters like <,>, &, " and \' with their HTML version)

ETA calculator - An ETA (Estimated Time of Arrival) calculator to determine the approximate end time of a task, for example, the end time and duration of a file download.

Git cheatsheet - Git is a decentralized version management software. With this cheatsheet, you will have quick access to the most common git commands.

Hash text - Hash a text string using the function you need : MD5, SHA1, SHA256, SHA224, SHA512, SHA384, SHA3 or RIPEMD160

Hmac generator - Computes a hash-based message authentication code (HMAC) using a secret key and your favorite hashing function.

HTML WYSIWYG editor - Online, feature-rich WYSIWYG HTML editor which generates the source code of the content immediately.

HTTP status codes - The list of all HTTP status codes, their name, and their meaning.

IBAN validator and parser - Validate and parse IBAN numbers. Check if an IBAN is valid and get the country, BBAN, if it is a QR-IBAN and the IBAN friendly format.

Integer base converter - Convert a number between different bases (decimal, hexadecimal, binary, octal, base64, ...)

IPv4 address converter - Convert an IP address into decimal, binary, hexadecimal, or even an IPv6 representation of it.

IPv4 range expander - Given a start and an end IPv4 address, this tool calculates a valid IPv4 subnet along with its CIDR notation.

IPv4 subnet calculator - Parse your IPv4 CIDR blocks and get all the info you need about your subnet.

IPv6 ULA generator - Generate your own local, non-routable IP addresses for your network according to RFC4193.

JSON diff - Compare two JSON objects and get the differences between them.

JSON minify - Minify and compress your JSON by removing unnecessary whitespace.

JSON prettify and format - Prettify your JSON string into a friendly, human-readable format.

JSON to CSV - Convert JSON to CSV with automatic header detection.

JSON to TOML - Parse and convert JSON to TOML.

Json to xml - Json to xml - free online tool.

JSON to YAML converter - Simply convert JSON to YAML with this online live converter.

JWT parser - Parse and decode your JSON Web Token (jwt) and display its content.

Keycode info - Find the javascript keycode, code, location and modifiers of any pressed key.

List converter - This tool can process column-based data and apply various changes (transpose, add prefix and suffix, reverse list, sort list, lowercase values, truncate values) to each row.

Lorem ipsum generator - Lorem ipsum is a placeholder text commonly used to demonstrate the visual form of a document or a typeface without relying on meaningful content

MAC address generator - Enter the quantity and prefix. MAC addresses will be generated in your chosen case (uppercase or lowercase)

MAC address lookup - Find the vendor and manufacturer of a device by its MAC address.

Markdown to html - Markdown to html - free online tool.

Math evaluator - A calculator for evaluating mathematical expressions. You can use functions like sqrt, cos, sin, abs, etc.

MIME types - Convert MIME types to file extensions and vice-versa.

Numeronym generator - A numeronym is a word where a number is used to form an abbreviation. For example, "i18n" is a numeronym of "internationalization" where 18 stands for the number of letters between the first i and the last n in the word.

Open graph meta generator - Generate open-graph and socials HTML meta tags for your website.

OTP code generator - Generate and validate time-based OTP (one time password) for multi-factor authentication.

Password strength analyser - Discover the strength of your password with this client-side-only password strength analyser and crack time estimation tool.

PDF signature checker - Verify the signatures of a PDF file. A signed PDF file contains one or more signatures that may be used to determine whether the contents of the file have been altered since the file was signed.

Percentage calculator - Easily calculate percentages from a value to another value, or from a percentage to a value.

Phone parser and formatter - Parse, validate and format phone numbers. Get information about the phone number, like the country code, type, etc.

QR Code generator - Generate and download a QR code for a URL (or just plain text), and customize the background and foreground colors.

Random port generator - Generate random port numbers outside of the range of "known" ports (0-1023).

Regex memo - Regex memo - free online tool.

Regex tester - Regex tester - free online tool.

Roman numeral converter - Convert Roman numerals to numbers and convert numbers to Roman numerals.

RSA key pair generator - Generate a new random RSA private and public pem certificate key pair.

Safelink decoder - Safelink decoder - free online tool.

Slugify string - Make a string url, filename and id safe.

SQL prettify and format - Format and prettify your SQL queries online (it supports various SQL dialects).

String obfuscator - Obfuscate a string (like a secret, an IBAN, or a token) to make it shareable and identifiable without revealing its content.

SVG placeholder generator - Generate svg images to use as a placeholder in your applications.

Temperature converter - Degrees temperature conversions for Kelvin, Celsius, Fahrenheit, Rankine, Delisle, Newton, Réaumur, and Rømer.

Text diff - Compare two texts and see the differences between them.

Text statistics - Get information about a text, the number of characters, the number of words, its size in bytes, ...

Text to ASCII binary - Convert text to its ASCII binary representation and vice-versa.

Text to NATO alphabet - Transform text into the NATO phonetic alphabet for oral transmission.

Text to Unicode - Parse and convert text to unicode and vice-versa

Token generator - Generate random string with the chars you want, uppercase or lowercase letters, numbers and/or symbols.

TOML to JSON - Parse and convert TOML to JSON.

TOML to YAML - Parse and convert TOML to YAML.

ULID generator - Generate random Universally Unique Lexicographically Sortable Identifier (ULID).

URL parser - Parse a URL into its separate constituent parts (protocol, origin, params, port, username-password, ...)

User-agent parser - Detect and parse Browser, Engine, OS, CPU, and Device type/model from an user-agent string.

UUIDs generator - A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems. The number of possible UUIDs is 16^32, which is 2^128 or about 3.4x10^38 (which is a lot!).

WiFi QR Code generator - Generate and download QR codes for quick connections to WiFi networks.

XML formatter - Prettify your XML string into a friendly, human-readable format.

Xml to json - Xml to json - free online tool.

YAML prettify and format - Prettify your YAML string into a friendly, human-readable format.

YAML to JSON converter - Simply convert YAML to JSON with this online live converter.

YAML to TOML - Parse and convert YAML to TOML.

Guides and articles

10 Essential Productivity Tools Every Modern Developer Needs in 2026 - Optimize your workflow with our top 10 picks for essential, privacy-focused developer utilities.

Mastering Web Security: A Developer's Guide to Bcrypt, JWT, and OTP - Learn how to protect user data using industry-standard hashing, authentication, and 2FA techniques.

The Art of Clean Data: Mastering JSON, XML, and SQL Formatting - Best practices for handling the most common data formats in web development to improve readability and debugging.

Navigating the Network: A Deep Dive into IP Subnetting and MAC Addresses - Understand the core concepts of networking, from CIDR notation to MAC address OUI lookups.

Frontend Excellence: Leveraging SVG and Color Tools for Perfect UI - Advanced techniques for using SVGs, color spaces, and content placeholders to build polished interfaces.

Mastering UUIDs: A Comprehensive Guide to Globally Unique Identifiers - Everything you need to know about UUID versions, use cases, and best practices for unique identification.

The Ultimate Guide to QR Codes: How to Create and Use Them Effectively - Learn how QR codes work, their common use cases, and how to create high-quality codes for your needs.

Understanding Base64: How to Encode Files and Images for the Web - A deep dive into Base64 encoding, its use cases in web development, and how to convert files easily.

Mastering Cron Jobs: A Guide to Scheduling Tasks with Crontab - Demystifying crontab syntax and learning how to automate server tasks with cron jobs.

Understanding Linux Permissions: A Guide to Chmod and File Security - Master file permissions in Linux and learn how to use chmod to secure your system.

Security Deep Dive: Mastering JWT, Bcrypt, and OTP for Secure Applications - Learn how to implement robust security in your applications using JWT parsing, Bcrypt hashing, and OTP generation.

The Architect's Guide to Data Transformation: JSON, YAML, TOML, and XML - A comprehensive guide to converting and formatting various data structures for modern web development.

Networking Essentials: Understanding IP Subnetting, MAC Addresses, and URL Parsing - Master the core concepts of networking tools, from subnet calculations to MAC address lookups.

Boosting Developer Productivity with Docker, Git, and Regex Tools - Optimize your workflow with essential tools for Docker configuration, Git management, and Regex testing.

Typography and Content: From ASCII Art to Text Statistics and Lorem Ipsum - Exploring the creative and analytical sides of text management in web design.

Mathematical Precision in Web Development: Math Evaluators and Unit Converters - How to handle complex calculations and unit conversions accurately in your web projects.

SEO and Meta Tags: How to Optimize Your Web Presence Automatically - Practical tips for using meta tag generators and slugify tools to improve your search engine rankings.

The Anatomy of a Perfect Password: Strength Analysis and Key Generation - Everything you need to know about creating and validating secure passwords and cryptographic keys.

Modern Web Standards: HTTP Status Codes, MIME Types, and User Agents - A deep dive into the fundamental standards that power the modern web.

Global Finance and Communication: IBAN Validation and Phone Formatting - Handling international data formats for banking and telecommunications with ease.

Frontend Utility Masterclass: From SVG Placeholders to Camera Recording - Advanced frontend techniques for dynamic UI components and media handling.

Modern Encryption Standards for Developers: A Comprehensive Guide to Data Security - In an era of escalating data breaches and sophisticated adversarial attacks, encryption is no longer a "nice-to-have" feature—it is a fundamental requirement of…

Containerization Strategies: Docker Best Practices for Production - Docker has fundamentally changed how we package and deploy applications. However, there is a massive gap between a "working Dockerfile" and a "production-ready image."…

Infrastructure as Code (IaC) Fundamentals: Terraform vs. Ansible - The days of manually configuring servers via SSH and a series of "hope-it-works" bash scripts are over. In modern cloud engineering, the infrastructure is the code.…

JWT Security: Common Pitfalls and Best Practices - JSON Web Tokens (JWT) have become the industry standard for stateless authentication and authorization. By encapsulating claims in a cryptographically signed token, JWTs…

Mastering CSS Grid and Flexbox for Complex Layouts - For years, web developers struggled with floats and table-based layouts to create multi-column designs. The introduction of Flexbox and CSS Grid revolutionized how we…

Mastering JSON: Efficient Data Management in Web Apps - In the modern web ecosystem, data is the lifeblood of every application. Whether you are building a lightweight React component or a complex microservices architecture,…

Modern Frontend Performance Optimization: Beyond the Basics - In the current era of "heavy" web applications, performance is no longer just about minimizing the number of HTTP requests or compressing images. It is about Perceived…

Monitoring and Observability: Setting up a Health Dashboard - In a complex system, "it\

The Definitive Guide to Password Hashing - In the modern landscape of cybersecurity, the question is not if a database will be breached, but when. When an attacker gains access to a user table, the only line of…

Implementing a Robust CI/CD Pipeline for Modern Web Apps - Continuous Integration (CI) and Continuous Deployment (CD) are often spoken of as a single entity, but they represent two distinct phases of the software delivery…

The Evolution of State Management in Vue 3: From Vuex to Pinia - State management is the heart of any complex frontend application. It is the mechanism that ensures data remains consistent as a user navigates through different views,…