Crypto & hash
Generate hashes, passwords, and keys in a browser-first crypto workspace
Security-focused tools for hashing, password strength, key pairs, signatures, and token-adjacent inspection without installing another utility.
Use this hub when you need to create credentials, compare hashes, inspect wallet data, or rehearse cryptographic workflows before moving to production systems and audited tooling.
Tools in this hub
Featured picks
Language support
Common tasks
Prepare credentials and shared secrets
Generate passwords, check their strength, and create hashes or HMAC values when a project needs safer defaults.
Work with keys and encrypted payloads
Create key pairs, encrypt or decrypt text, and inspect security material without leaving the browser.
Debug blockchain-related encodings
Verify checksum addresses, convert Ethereum units, and inspect calldata while tracing contract behavior.
Featured tools
Start with the registered tools that cover the most common jobs in this workflow, then browse the full list.
Secure Password Generator
Generate strong, random passwords with customizable length and character sets using this free online tool. No sign-up required, runs entirely in your browser.
SHA Hash & HMAC Generator
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes and HMAC signatures with this free online tool. No sign-up required, runs entirely in your browser.
X.509 Certificate Chain Validator — Verify PEM Chains
Build and verify an X.509 certificate chain from PEM files. Check signatures, trust anchors, dates, CA constraints, key usage, purpose, and TLS hostnames locally.
PGP Encryption & Decryption — OpenPGP Online
Client-side online PGP decrypt and encrypt tool. Inspect armored message metadata, verify signatures, inspect key fingerprints, and generate ECC/RSA keys with OpenPGP.js.
OTP Generator & TOTP Authenticator — 2FA Codes
Generate automatically refreshing TOTP and OTP codes for two-factor authentication. View adjacent time windows, scan a QR code, and copy derived values locally.
All tools in this category
Browse every registered tool in this category and keep moving through the real task at hand.
Secure Password Generator
Generate strong, random passwords with customizable length and character sets using this free online tool. No sign-up required, runs entirely in your browser.
SHA Hash & HMAC Generator
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes and HMAC signatures with this free online tool. No sign-up required, runs entirely in your browser.
UUID v4 & v7 Generator
Generate UUID v4 (random) and UUID v7 (timestamp-based) identifiers in bulk with this free online tool. No sign-up required, runs entirely in your browser.
Wei Gwei Ether Converter
Convert Ethereum values between wei, gwei, and ether for gas fee estimates, transaction debugging, and smart contract development.
X.509 Certificate Chain Validator — Verify PEM Chains
Build and verify an X.509 certificate chain from PEM files. Check signatures, trust anchors, dates, CA constraints, key usage, purpose, and TLS hostnames locally.
WebAuthn and Passkey Credential Debugger
Inspect WebAuthn credential JSON, client data, authenticator flags, attestation CBOR, COSE keys, counters, and assertion fields offline.
Ethereum Address Checksum Tool
Validate and convert Ethereum wallet addresses to EIP-55 checksum format for Web3 development and transaction safety.
ABI Selector and Calldata Inspector
Compute Ethereum ABI function selectors and inspect calldata prefixes for Solidity smart contract debugging.
Keccak-256 Hash Tool
Generate Keccak-256 hashes for Ethereum, Solidity, smart contracts, selectors, and Web3 debugging.
Transaction Calldata Decoder
Inspect whole-byte, 0x-prefixed Ethereum calldata, function selectors, byte length, and raw transaction fields.
Wallet Signature Inspector
Inspect Ethereum wallet signatures, EIP-191 framing, r/s/v fields, hexadecimal validity, and 65-byte payload shape.
JWE Encrypt, Decrypt, and Protected Header Inspector
Encrypt and decrypt compact JWE tokens locally with dir/A256GCM or RSA-OAEP-256/A256GCM, and inspect protected headers without decrypting.
BIP39 Seed Phrase Structure Checker
Check BIP39 recovery phrase word count, duplicate words, and common mnemonic formatting issues without sending data to a server.
Certificate Format Converter — PEM, DER, P7B, and PFX Inspector
Convert X.509 certificates between PEM and DER, inspect bundles, extract PKCS#7 certificates, and locally inspect password-protected PKCS#12/PFX files.
AES Encryption & Decryption Tool
Encrypt and decrypt text with authenticated AES-GCM. Tampered ciphertext is rejected, keys are derived from passwords with PBKDF2, and all processing stays in your browser.
Bcrypt Hash Generator & Verifier
Generate and verify bcrypt password hashes with adjustable cost factor using this free online tool. No sign-up required, runs entirely in your browser.
Merkle Tree Root & Proof Tool
Build a Keccak Merkle root from leaves, generate an inclusion proof for any leaf, and verify that proof against the root.
Base58, Bech32 & Hex Converter
Convert blockchain data between Base58, Bech32 or Bech32m, and hexadecimal, with checksum validation and witness version detection.
OTP Generator & TOTP Authenticator — 2FA Codes
Generate automatically refreshing TOTP and OTP codes for two-factor authentication. View adjacent time windows, scan a QR code, and copy derived values locally.
X.509 Certificate Decoder
Free online X.509 certificate decoder. Parse PEM certificates to view subject, issuer, validity, SAN, fingerprints, and extensions. No sign-up required.
Password Strength Analyser
Estimate how many guesses a password really takes by detecting dictionary words, leet spelling, repeats, sequences, keyboard runs and dates, with crack times for four attack scenarios.
RSA Key Pair Generator
Generate 2048, 3072, or 4096-bit RSA key pairs in the browser and export them as SPKI and PKCS#8 PEM blocks.
Ed25519 Key Generator — Sign & Verify
Free online Ed25519 key pair generator with message signing and signature verification. Uses the Web Crypto API. No sign-up, runs in your browser.
PGP Encryption & Decryption — OpenPGP Online
Client-side online PGP decrypt and encrypt tool. Inspect armored message metadata, verify signatures, inspect key fingerprints, and generate ECC/RSA keys with OpenPGP.js.
BIP39 Mnemonic Generator — Seed Phrase Creator
Free online BIP39 mnemonic generator. Create 12-24 word seed phrases with cryptographic entropy and checksum validation. No sign-up, runs in your browser.
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