Crypto & dev tools

Free Online CSR Generator (Apple Developer CSR)

Generate Apple Developer certificate CSRs and RSA key pairs locally in your browser. No private keys or CSRs are uploaded.

Apple Developer CSR

This tool generates an RSA 2048 key pair and creates a PKCS#10 CSR entirely in your browser. No private keys or CSRs are uploaded. Please store the generated private key securely.

Subject (DN)

Email Common Name (CN)

Preview: -

Tip: Submit the CSR to Apple Developer or your CA to request a certificate. Never upload your private key.

CSR (PEM)

Private key (PKCS#8 PEM)

Public key (SPKI PEM)

How to Use

Fill in the Subject information (Email, Common Name, etc.).
Click 'Generate CSR' to create an RSA key pair and CSR.
Download the CSR file (.csr) to submit to your Certificate Authority.
Download and securely save the Private Key (.key); it cannot be recovered if lost.

Tips

CSR (Certificate Signing Request) is required to apply for a digital certificate.
The private key is generated locally in your browser and is never uploaded.
Ensure the Common Name (CN) matches the domain or identity you are securing.

File Encryption

Encrypt or decrypt files locally with AES-256-GCM and download either the JSON payload or the restored file, all in the browser.

PEM/JWK Converter

Convert PEM/DER/JWK/JWKS locally, export JWK/JWKS and PEM/DER, and inspect key details.

ZIP Encryptor

Free online ZIP Encryptor. Pack files into ZIP and encrypt with AES-256-GCM locally.

AES-256

Lightweight, privacy-first online tools that run entirely in your browser. AES encryption and word counter are available now, more utilities coming soon.

RSA key generator

Generate RSA-OAEP key pairs locally in your browser and export PEM public/private keys for testing and development.

Salt generator

Generate cryptographically secure random salt values locally in your browser with configurable length and Hex/Base64/Base64URL output formats, ideal for password hashing and token signing.

Password strength checker

Evaluate password length, character types, diversity and common patterns, and combine this with database breach checks via k-anonymity so only hash prefixes are sent and your plain password stays on your device.

API key generator

Securely generate various types of API keys with custom formats and batch generation, all locally in your browser.

Random number generator

Configure minimum/maximum range, count, uniqueness and output format to generate random integers using crypto.getRandomValues locally in your browser for draws, test data and simulations.

JWT generator

Edit JWT header and payload, choose HS256/HS384/HS512 or none, and generate signed tokens locally in your browser via Web Crypto without uploading secrets, ideal for API auth testing.

JWT token decoder

Free online JWT token decoder: decode header and payload, inspect signature segment format, and interpret common claims such as exp/nbf/iat, all locally in your browser with no token data uploaded.

HMAC generator

Generate HMAC values locally in your browser using SHA-1 / SHA-256 / SHA-512 with text or hex keys, and view Hex and Base64 outputs without uploading any data.

Hash generator and checker

Compute MD5 / SHA-1 / SHA-256 / SHA-512 hashes for text or files locally in your browser and optionally compare them with an expected value.

Base64 encoder / decoder

Encode or decode UTF-8 text to and from Base64, including URL-safe mode, with all processing done locally in your browser.

DES

Legacy-compatible DES encrypt/decrypt tool with CBC/ECB modes and local-only processing.

Password Hash

Generate or verify bcrypt/argon2id password hashes locally in your browser with no uploads.