Text Hash
Generate cryptographic hashes from text using MD5, SHA-1, SHA-256, SHA-384, SHA-512, and SHA-3.
Privacy & Security Tools
Privacy & SecurityPrivate browser based security utilities for hashing, encoding, encryption, key generation, and secure data inspection. Everything is processed locally on your device without uploading your sensitive data.
Open SourcePrivacy FirstClient SideNo UploadsNo TrackingFree Forever
Last Updated: 28 September 2026
Privacy & Security Tools
Powerful privacy and security utilities for hashing, encoding, cryptography, and secure data workflows. Built to run directly in your browser.
Generate SHA, MD5, and other cryptographic hashes locally from text and files.
File Hash
Generate cryptographic hashes for files locally without uploading them to a server.
Guaranteed Local Privacy
Client SideFlagsDev is engineered to process your confidential documents directly in your browser sandbox, ensuring that your files never leave your device. We prioritize your privacy and security above all else.
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Features
Text Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, and SHA-3 hashes from text directly in your browser.
File Hash Calculator
Calculate cryptographic hashes for local files to verify integrity without uploading them to a server.
Base64 Encoder & Decoder
Encode and decode text or binary data using Base64 entirely within your browser.
URL Encoder & Decoder
Safely encode and decode URLs and query parameters without sending your data to an external service.
HTML Entity Encoder & Decoder
Convert special characters to HTML entities and decode HTML entities back into readable text locally.
Unicode Encoder & Decoder
Inspect and convert Unicode characters, escape sequences, and code points directly on your device.
Hex & Binary Converter
Convert text and data between hexadecimal, binary, decimal, and readable representations.
Secure Password Generator
Generate strong random passwords using browser cryptographic randomness with configurable length and character sets.
UUID Generator
Generate unique UUIDs locally without external APIs, accounts, or network requests.
HMAC Generator
Generate HMAC signatures using supported cryptographic algorithms with keys that remain in your browser.
AES Encrypt & Decrypt
Encrypt and decrypt supported data using AES through the browser's native Web Crypto API.
RSA Key Generator
Generate RSA key pairs locally for supported cryptographic workflows without transmitting private keys.
RSA Encrypt & Decrypt
Perform supported RSA encryption and decryption operations locally using browser cryptography APIs.
JWT Encoder & Decoder
Create and decode JSON Web Tokens locally while keeping your token data inside the browser.
JWT Inspector
Inspect JWT headers, payloads, claims, timestamps, and token structure without uploading the token.
Frequently Asked Questions
Is my sensitive data uploaded to FlagsDev?
No. These tools are designed to process supported inputs directly in your browser. Your text, files, keys, tokens, and other input data do not need to be uploaded to a FlagsDev server.
Can I use these security tools for private data?
Yes. Processing is performed locally in your browser for supported tools. However, you should always understand the cryptographic algorithm and configuration before using generated output for security critical systems.
What is the difference between hashing and encryption?
Hashing produces a one way digest that is designed to be difficult to reverse, while encryption transforms data into ciphertext that can be decrypted using the appropriate key.
Does encoding protect my data?
No. Encoding such as Base64, hexadecimal, and URL encoding is designed to represent data in another format, not to provide confidentiality or security.
Are private keys sent to a server?
No. Supported cryptographic operations are performed locally in your browser, so private keys can remain on your device.
Which cryptographic APIs do these tools use?
Where supported, cryptographic operations use the browser's native Web Crypto API rather than sending sensitive data to a remote service.
Can I use the JWT tools to verify a token?
The JWT tools can inspect and decode token structure locally. Signature verification depends on the token algorithm and the appropriate verification key or secret being available.
Does FlagsDev store my inputs or generated results?
FlagsDev does not need to store your inputs or generated results on a server for these browser-based tools. Processing happens locally whenever the selected operation supports client-side execution.
Are these tools suitable for production cryptography?
They are useful for development, testing, inspection, and learning. For security-critical production systems, always review the algorithm, key management, implementation, and threat model independently rather than relying solely on a browser utility.
Is the Privacy & Security category open source?
Yes. FlagsDev is an open-source project, allowing users to inspect the implementation and contribute improvements.
Open Source
Open Source Project
This tool is open source, privacy-first, and built with the help of the community.
Contributors
Community Driven
Help Improve This Tool
This project is completely open source and built by developers from the community. Whether you've found a bug, have an idea for a new feature, or want to improve the codebase, every contribution is appreciated.