Cryptography & Security

Hash generators, encryption tools, UUID generators, and cryptographic utilities for developers and security professionals.

8 calculators available
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01
MD5 Hash Generator

Generate MD5 hashes from text or files instantly. Free online MD5 checksum calculator with copy-to-c
02
SHA-256 Hash Generator

Generate SHA-256 hashes from text or files online. Secure 256-bit cryptographic hash calculator usin
03
SHA-512 Hash Generator

Generate SHA-512 hashes from text or files online. 512-bit cryptographic hash calculator with file s
04
SHA-1 Hash Generator

Generate SHA-1 hashes from text or files. 160-bit hash calculator with deprecation warning. Useful f
05
HMAC Generator

Generate HMAC (Hash-based Message Authentication Code) with SHA-256, SHA-512, or SHA-1. Verify messa
06
AES Encrypt / Decrypt

Encrypt and decrypt text with AES-256-GCM encryption using a password. Client-side encryption with P
07
UUID Generator

Generate random v4 UUIDs instantly. Bulk generate up to 100 UUIDs, validate UUID format, and copy wi
08
Bitcoin Address Generator

Generate Bitcoin key pairs and addresses using pure JavaScript elliptic curve cryptography. Educatio
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About Cryptography & Security Tools

YalmCalc's cryptography and security toolkit gives developers, students, and security professionals instant access to industry-standard hashing, encryption, and identifier-generation utilities — all running entirely in your browser. Every tool leverages the native Web Crypto API, so your data never leaves your device.

Need to verify a file download? Generate an MD5, SHA-1, SHA-256, or SHA-512 hash and compare it against the published checksum. Working on API authentication? The HMAC generator produces keyed-hash message authentication codes with SHA-256, SHA-512, or SHA-1. For confidential messages, the AES Encrypt/Decrypt tool uses AES-256-GCM — the same cipher trusted by governments and financial institutions — with password-based key derivation (PBKDF2) for maximum security.

Developers building distributed systems will appreciate the UUID Generator, which creates RFC 4122-compliant version-4 identifiers in bulk. Blockchain enthusiasts can explore public-key cryptography with the Bitcoin Address Generator, which demonstrates elliptic-curve key-pair creation in pure JavaScript. Whether you are auditing password storage, signing API requests, or simply learning how modern cryptography works, these tools provide a safe, private, and completely free sandbox to experiment in.

Featured Tools

SHA-256 Generator
Secure 256-bit hashes for file verification & integrity checks
AES Encrypt / Decrypt
Military-grade AES-256-GCM encryption with password protection
UUID Generator
Bulk-generate RFC 4122 v4 unique identifiers instantly

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Frequently Asked Questions

Q: Is my data secure when using these cryptography tools?

A: Yes. All YalmCalc cryptography tools run entirely in your browser using the Web Crypto API and JavaScript. Your data is never sent to any server. Hashing, encryption, decryption, and key generation all happen client-side, so your sensitive information stays on your device at all times.

Q: What is the difference between encryption and hashing?

A: Hashing is a one-way process that converts data into a fixed-length digest (like SHA-256 or MD5). You cannot reverse a hash to recover the original data, making it ideal for verifying file integrity and storing passwords. Encryption is a two-way process that scrambles data using a key so it can be decrypted later with the correct key, making it suitable for protecting confidential messages and files.

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