DevTools

Developer Tools for the modern web

A collection of free, privacy-first, 100% client-side developer utilities. No server-side processing - your data never leaves your browser.

🔒 Cryptography & Security

RSA Encrypt/Decrypt

Securely encrypt and decrypt messages using RSA asymmetric encryption.

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RSA Sign/Verify

Create and verify digital signatures using RSA keys.

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RSA Key Pair Generator

Generate secure RSA public and private key pairs locally.

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PEM/XML Key Converter

Convert RSA keys between PEM and XML formats.

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Ed25519 Key Pair Generator

Generate modern Ed25519 signing keys.

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Ed25519 Sign/Verify

High-performance signing and verification with Ed25519.

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ChaCha20 Encrypt/Decrypt

Fast and secure stream cipher encryption.

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Bcrypt Hash/Verify

Hash passwords and verify hashes using Bcrypt.

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🔑 Symmetric Encrypt/Decrypt

AES

Advanced Encryption Standard encryption and decryption.

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TripleDES

Triple Data Encryption Standard algorithm.

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Rabbit

High-speed stream cipher encryption.

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RC4

Rivest Cipher 4 stream cipher.

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DES

Data Encryption Standard legacy algorithm.

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#️⃣ Hash Generator

MD5

Generate MD5 hashes.

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SHA1

Generate SHA-1 hashes.

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SHA224

Generate SHA-224 hashes.

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SHA256

Generate SHA-256 hashes.

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SHA384

Generate SHA-384 hashes.

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SHA512

Generate SHA-512 hashes.

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SHA3

Generate SHA-3 (Keccak) hashes.

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CRC32

Cyclic Redundancy Check 32-bit.

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SM3

Chinese cryptographic hash standard.

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RIPEMD160

RACE Integrity Primitives Evaluation Message Digest.

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🛡️ HMAC Generator

HMAC MD5

Hash-based Message Authentication Code using MD5.

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HMAC SHA1

HMAC using SHA-1.

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HMAC SHA224

HMAC using SHA-224.

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HMAC SHA256

HMAC using SHA-256.

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HMAC SHA384

HMAC using SHA-384.

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HMAC SHA512

HMAC using SHA-512.

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HMAC SHA3

HMAC using SHA-3.

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HMAC SM3

HMAC using SM3.

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HMAC RIPEMD160

HMAC using RIPEMD160.

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🔄 Encoding & Decoding

Base64 Encode/Decode

Convert data to and from Base64 format.

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URL Encode/Decode

Encode and decode URLs.

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Unicode Encode/Decode

Convert text to Unicode escape sequences.

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Character Encoding Converter

Convert between different character encodings.

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HTML Entity Encode/Decode

Escape and unescape HTML entities.

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Punycode Converter

Convert Unicode domain names to ASCII Punycode.

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⚡ Generators

UUID Generator

Generate unique 128-bit identifiers (UUID v4).

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ULID Generator

Generate Universally Unique Lexicographically Sortable Identifiers.

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Random Password Generator

Create strong, secure random passwords.

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Lorem Ipsum Generator

Generate placeholder text for designs.

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Cron Expression Generator

Build and test cron schedule expressions.

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🛠️ Converters & Utilities

Timestamp Converter

Convert Unix timestamps to human-readable dates.

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Color Picker & Converter

Convert between HEX, RGB, HSL, and CMYK.

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Number Base Converter

Convert numbers between binary, octal, decimal, and hex.

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📷 Media & Misc

Audio to MIDI Converter

Convert audio files to MIDI sequences.

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Image EXIF Viewer

View and extract metadata from images.

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Why DevTools?

Privacy-First Developer Utilities

We believe your data belongs to you. That's why all our tools run 100% in your browser.

100% Client-Side

Your data never leaves your browser. All calculations, encryptions, and conversions happen locally on your device.

Blazing Fast

No server latency. Instant results powered by modern browser technologies like WebAssembly and optimized JavaScript.

Secure & Private

No tracking, no analytics, and no logs. We believe in providing professional tools without any hidden strings.

About DevTools

Welcome to DevTools (tools.qr9.net), your go-to destination for secure, efficient, and easy-to-use developer utilities. Whether you need to encrypt sensitive data, generate secure keys, convert formats, or debug code, we have the right tool for you.

Our mission is to provide a comprehensive suite of tools that respect your privacy. DevTools runs entirely in your browser. This means your private keys, passwords, and sensitive documents never leave your computer.

Key Features