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All Free Online Tools

Browse 291+ free online tools for hashing, encoding, decoding, encryption, and security analysis. All processing happens 100% client-side — your data never leaves your browser.

Hash Functions

Cryptographic hashes, checksums, and HMAC — 28 tools

Generate MD5 hash of input text

Generate SHA-256 hash of input text

Generate SHA-1 hash of input text

Generate SHA-512 hash of input text

Hash Identifier

Identify hash type from hash string

Generate HMAC-SHA256 message authentication code

Generate HMAC-MD5 message authentication code

Verify if text matches a given hash

Compute CRC32 checksum of input text

NTLM Hash Calculator

Generate NTLM (NT Hash) from password - used in Windows authentication

Generate SHA-3 hash of input text

Generate Keccak-256 hash of input text

Generate RIPEMD-160 hash of input text

Generate BLAKE2b hash of input text

Generate BLAKE2s hash of input text

Generate SHA-224 hash of input text

Generate SHA-384 hash of input text

Generate SM3 hash of input text

Generate MD4 hash of input text

Extendable-output SHAKE128 hash

Extendable-output SHAKE256 hash

Compute Adler-32 checksum of input text (faster than CRC32)

Compute CRC16 checksum of input text (CCITT polynomial)

Generate BLAKE3 hash - fast, secure, modern cryptographic hash

Generate Whirlpool hash - 512-bit AES-based cryptographic hash

Generate xxHash32 - extremely fast 32-bit non-cryptographic hash

Generate xxHash64 - extremely fast 64-bit non-cryptographic hash

Generate xxHash128 - extremely fast 128-bit non-cryptographic hash

Encodings

Encode and decode data in various formats — 39 tools

Encode text to Base64

Decode Base64 to text

Encode text for URLs (percent encoding)

Decode URL-encoded text

Encode text to hexadecimal

Decode hexadecimal to text

Encode special characters as HTML entities

Decode HTML entities to text

Encode text to decimal byte values

Convert binary to text

Convert text to ASCII codes

Convert ASCII codes to text

Morse Code Encode

Convert text to Morse code signals

Morse Code Decode

Convert Morse code signals back to text

Encode text to Base32

Decode Base32 to text

Encode text to decimal byte values

Convert decimal codes to text

Convert text to octal codes

Convert octal codes to text

Encode number to any base (2-85)

Decode from any base (2-85) to decimal

Encode text to Base85 (ASCII85, !-u alphabet, matching CyberChef)

Decode Base85 (ASCII85, !-u alphabet, matching CyberChef)

Encode text to Base36 (0-9, A-Z)

Decode Base36 to text

Base58Check Encode

Encode with Base58Check (cryptocurrency standard with checksum)

Base58Check Decode

Decode and validate Base58Check with checksum verification

Brainfuck Decoder

Decode Brainfuck code by running it (outputs the text)

Brainfuck Encoder

Convert text to Brainfuck code

Unicode Normalization

Normalize Unicode text (NFC, NFD, NFKC, NFKD)

Convert text to Unicode code points

Convert Unicode code points to text

Encode text using UUEncoding

Decode UUEncoded text

Quoted-Printable Encode

Encode text using Quoted-Printable (email standard)

Quoted-Printable Decode

Decode Quoted-Printable text

Base64 Image Viewer

View an image from a Base64 string

Image to Base64

Convert an image file to a Base64 string

Ciphers

Classical and modern encryption algorithms — 28 tools

Encrypt/decrypt using Caesar cipher with custom shift

Apply ROT cipher with presets (ROT5, ROT13, ROT18, ROT47) or custom shift

Apply Atbash cipher (A=Z, B=Y, etc.)

Vigenère Encrypt

Encrypt using Vigenère cipher

Vigenère Decrypt

Decrypt using Vigenère cipher

Rail Fence Encrypt

Encrypt using Rail Fence cipher

Rail Fence Decrypt

Decrypt using Rail Fence cipher

Columnar Transposition Encrypt

Encrypt using Columnar Transposition cipher

Columnar Transposition Decrypt

Decrypt using Columnar Transposition cipher

Encrypt/decrypt using XOR stream cipher with multiple key formats

Playfair Encrypt

Encrypt using Playfair cipher

Playfair Decrypt

Decrypt using Playfair cipher

Encrypt using AES (Advanced Encryption Standard)

Decrypt using AES (Advanced Encryption Standard)

Encrypt using DES (Data Encryption Standard)

Decrypt using DES (Data Encryption Standard)

Encrypt using RC4 stream cipher

Decrypt using RC4 stream cipher

Caesar/ROT Brute Force

Try all 26 Caesar cipher shifts and display results

XOR Single-Byte Brute Force

Try all 256 single-byte XOR keys and score by printability

Frequency Analysis

Analyze letter frequencies for breaking substitution ciphers

Vigenère Key Length Analyzer

Find probable key length using Kasiski examination and Index of Coincidence

Polybius Square Encode

Encode using Polybius Square cipher (5x5 grid, A-Z without J)

Polybius Square Decode

Decode using Polybius Square cipher (pairs of digits 1-5)

Hill Cipher Encrypt

Encrypt using Hill cipher with a key matrix (2x2 or 3x3). Matrix must be invertible in mod 26.

Hill Cipher Decrypt

Decrypt using Hill cipher with a key matrix (2x2 or 3x3). Matrix must be invertible in mod 26.

Encode text using A1Z26 cipher (A=1, B=2, ..., Z=26)

Decode A1Z26 cipher (1=A, 2=B, ..., 26=Z) back to text

Compression

Gzip and zlib compression/decompression — 10 tools

Compress text using Gzip (Chromium-based browsers required)

Gzip Decompress

Decompress Gzip data (Chromium-based browsers required)

Compress text using zlib deflate (Chromium-based browsers required)

Decompress zlib data (Chromium-based browsers required)

Compress text using LZW algorithm (works in all browsers)

Decompress LZW-compressed data (works in all browsers)

Compress using raw deflate without headers (useful for CTF)

Decompress raw deflate data without headers (useful for CTF)

Brotli Compress

Compress text using Brotli algorithm (fast, better ratio than gzip)

Brotli Decompress

Decompress Brotli data (used by many web servers)

JWT

JSON Web Token encode, decode, and interactive editing — 7 tools

Decode a JWT into header, payload, and signature

JWT Encode (HS256)

Create a signed JWT using HMAC-SHA256

JWT Interactive Editor

Bidirectional JWT decoder & encoder - edit either JWT or JSON

JWT RS256 Verify

Verify JWT signature using RSA-SHA256 public key (JWK or PEM)

JWT ES256 Verify

Verify JWT signature using ECDSA P-256 public key (JWK or PEM)

JWK to PEM Converter

Convert JSON Web Key (JWK) to PEM format (RSA or EC)

PEM to JWK Converter

Convert PEM key to JSON Web Key (JWK) format

Parsers

Format conversion tools - JSON, YAML, XML, CSV, INI, TOML, ENV — 13 tools

Convert JSON data to YAML format

Convert YAML data to JSON format

Convert JSON data to XML format

Convert XML data to JSON format

Convert JSON array to CSV format

Convert CSV data to JSON format

Parse TOML configuration file to JSON

Prettify or minify JSON data

Validate JSON syntax and structure

JSON to TypeScript

Generate TypeScript interface from JSON object

JSON Escape/Unescape

Escape or unescape JSON strings

Pretty-print XML

Data Type Detection

Analyze input and detect data format (JSON, XML, JWT, Base64, Hex, etc.)

Generators

Password, UUID, and random data generators — 16 tools

Password Generator

Generate secure random passwords with customizable options

Generate UUIDs (versions 1, 3, 4, 5, 6, 7) with customizable options

QR Code Generator

Generate QR code from text with safe preview

Entropy Calculator

Calculate Shannon entropy of text

Random Number Generator

Generate cryptographically secure random numbers

Random Key Generator

Generate cryptographically secure random keys/tokens

Password Strength

Check password strength (quick check)

Generate URL-safe slugs from text

Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text

Generate Time-based One-Time Passwords (2FA codes)

Fake Data Generator

Generate realistic test data (names, emails, addresses, etc.)

Barcode Generator

Generate Code128 and EAN-13 barcodes as SVG

API Key Generator

Generate secure, configurable API keys

CUID2 Generator

Generate collision-resistant, sortable CUID2 identifiers

Snowflake ID Generator

Generate Twitter-style Snowflake IDs (64-bit distributed IDs)

Roll dice using RPG notation (e.g., 2d6+3, 4d8-2)

Password Hashing

bcrypt, PBKDF2 secure password hashing — 5 tools

Hash passwords with bcrypt (industry standard)

Verify password against bcrypt hash

Password-Based Key Derivation Function 2

Argon2 password hashing (winner of Password Hashing Competition)

scrypt password hashing (memory-hard function)

Certificates & Keys

RSA and ECDSA key generation, encryption, signing — 17 tools

RSA Key Generator

Generate RSA public/private key pair

Encrypt text with RSA public key

Decrypt RSA ciphertext with private key

Sign message with RSA private key

Verify RSA signature with public key

ECDSA Key Generator

Generate ECDSA public/private key pair

X.509 Certificate Parser

Parse and analyze X.509 certificates

SSH Key Generator

Generate real SSH key pairs (RSA or ECDSA)

Sign message with ECDSA private key

Verify ECDSA signature with public key

ECDH Key Generator

Generate ECDH key pair for Diffie-Hellman exchange

ECDH Derive Secret

Derive shared secret from ECDH key exchange

Ed25519 Key Generator

Generate Ed25519 key pair (modern, fast, secure)

Sign message with Ed25519 private key

Verify Ed25519 signature with public key

ChaCha20-Poly1305 Encrypt

Encrypt data with ChaCha20-Poly1305 (modern authenticated encryption)

ChaCha20-Poly1305 Decrypt

Decrypt data encrypted with ChaCha20-Poly1305 / AES-GCM

Blockchain

Bitcoin, Ethereum, and BIP39 mnemonic tools — 8 tools

Bitcoin Address Validator

Validate Bitcoin addresses (Base58Check, Bech32)

Ethereum Address Validator

Validate Ethereum addresses with EIP-55 checksum verification

BIP39 Mnemonic Generator

Generate BIP39 mnemonic phrases

Solana Address Validator

Validate Solana addresses (Base58)

Wei/Gwei/ETH Converter

Convert between Ethereum units (Wei, Gwei, Ether)

HD Wallet Path Info

Explain BIP32/BIP44 derivation paths

Mnemonic Validator

Validate BIP39 mnemonic phrases

ETH Address Checksummer

Convert Ethereum address to EIP-55 checksummed format

Color Tools

Color conversion and WCAG accessibility checking — 11 tools

Convert HEX color to RGB format

Convert RGB color to HEX format

Convert HEX color to HSL format

Convert HSL color to HEX format

Convert RGB color to CMYK format (print design)

Convert CMYK color to RGB format

WCAG Contrast Checker

Check color contrast for accessibility (WCAG 2.0)

Lighten/Darken Color

Adjust color brightness by percentage

Blend two colors together at a specified ratio

Complementary Color

Get the complementary (opposite) color on the color wheel

Color Palette Generator

Generate harmonious color palettes (triadic, analogous, shades, tints)

Developer Tools

Code utilities, formatters, and developer helpers — 12 tools

Text Difference

Compare two texts with high-precision highlighting and multiple view modes

HTML/CSS/JS Minifier

Minify code to reduce file size (lightweight, regex-based)

Code Beautifier

Format and pretty-print JavaScript, HTML, CSS, and JSON

Markdown Table Generator

Convert CSV or JSON data into Markdown tables

JSON Schema Validator

Validate JSON data against JSON Schema (AJV)

Regex Explainer

Explain JavaScript regular expressions in plain English

Generate ULIDs (Universally Unique Lexicographically Sortable IDs)

Parse INI file to JSON

Parse .env file to JSON

User-Agent Randomizer

Generate random or browser-specific User-Agent strings

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

Format and beautify SQL queries with customizable indentation

Math & Calculations

Big numbers, unit conversions, and matrix operations — 10 tools

Big Number Calculator

Perform arithmetic on numbers larger than JavaScript limits

Modular Arithmetic

Calculate mod, inverse mod, GCD, and LCM

RSA Parameters Validator

Validate RSA parameters (p, q, n, e) for correctness

Matrix Calculator

Matrix operations: add, subtract, multiply, determinant, inverse, transpose, trace, rank

Boolean Algebra Calculator

Evaluate boolean expressions and generate truth tables

Percentage Calculator

Calculate percentages, increases, decreases, and more

Convert between units of length, weight, temperature, and more

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal

Bitwise Calculator

Perform bitwise operations: AND, OR, XOR, NOT, shifts

Scientific Notation Converter

Convert between standard numbers and scientific notation

Unit Converters

Temperature, length, weight, data size, time, and other unit conversions — 11 tools

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin

Length Converter

Convert between meters, feet, inches, miles, kilometers, and more

Weight/Mass Converter

Convert between kilograms, pounds, ounces, grams, and more

Data Size Converter

Convert between bytes, KB, MB, GB, TB, and bits

Time Duration Converter

Convert between seconds, minutes, hours, days, weeks, months, and years

Speed Converter

Convert between km/h, mph, m/s, knots, and ft/s

Convert between square meters, acres, hectares, square feet, and more

Volume Converter

Convert between liters, gallons, cups, milliliters, and more

Roman Numeral Converter

Convert between Roman numerals and decimal numbers

Percentage Calculator

Calculate percentages: X% of Y, X is what % of Y, % change

Scientific Notation Converter

Convert between standard numbers and scientific notation

Image Tools

Convert, resize, compress, and transform images — 8 tools

Image Format Converter

Convert images between PNG, JPEG, and WebP formats

Resize images to custom dimensions

Image Compressor

Reduce image file size by adjusting quality

Image Flip/Rotate

Flip horizontally/vertically or rotate images by 90°, 180°, 270°

Color Palette Extractor

Extract dominant colors from an image

Image Information

Get detailed information about an image (dimensions, size, type)

Image to Grayscale

Convert a color image to grayscale/black-and-white

Invert Image Colors

Invert/negate all colors in an image

Networking

IP calculations, URL parsing, and network utilities — 21 tools

Parse URL into components

Build URL from components

HTTP Request Builder

Build raw HTTP requests with custom headers and body

IPv6 Validator/Converter

Validate and expand/compress IPv6 addresses

CIDR Calculator

Calculate subnet information from CIDR notation

Convert IPv4 address to binary

Convert IPv4 address to decimal

MAC Address Lookup

Identify vendor from MAC address

MAC Address Converter

Convert a MAC address between integer, hexadecimal, dot notation and more

Port Number Lookup

Look up common port numbers and services

DNS Record Simulator

Parse and explain DNS record formats

Email Validator

Validate email address (RFC 5322)

Domain Validator

Validate domain name

User-Agent Parser

Parse User-Agent string

HTTP Status Code Lookup

Look up HTTP status code information

Content-Type Lookup

Get MIME type for file extension

Private IP Checker

Check if IP address is private

Ping/Latency Calculator

Calculate round-trip time and network latency

Network Speed Converter

Convert between network speed units (Mbps, MBps, Gbps)

CIDR to IP List

Expand CIDR notation to list of individual IP addresses

SSL/TLS Version Checker

Explain TLS versions and their security status

Text Utilities

String manipulation, sorting, and text analysis — 15 tools

Convert text to various cases

Comprehensive text analysis: statistics, readability, character breakdown, and word frequency

Sort text lines in various orders (A-Z, Z-A, by length, random)

Remove Duplicate Lines

Remove duplicate lines from text

Remove Empty Lines

Remove empty lines from text

Extract email addresses from text

Test regular expressions with live matching, groups, and replace

Add Line Numbers

Add line numbers to text

Reverse the order of lines

Reverse the order of characters in text

Levenshtein Distance

Calculate edit distance between two strings

Run Length Encode

Compress text using run-length encoding

CTF Flag Extractor

Extract CTF flags (FLAG{}, CTF{}, HTB{}, etc.) from text

Search and replace text with support for regex and capture groups

Character Set Detection

Detect character encoding and analyze Unicode properties of text

AI Tools

LLM tokenization, prompt optimization, and AI workflow utilities — 6 tools

Count tokens for GPT, Claude, and Gemini models (LLM cost estimator)

Convert Token-Oriented Object Notation to JSON

Convert JSON to TOON format (30-60% token savings for LLMs)

Clean and normalize prompts for LLM usage (remove excess whitespace, dedent)

Analyze logs using regex patterns (extract IPs, timestamps, errors, URLs)

YARA Rule Helper

Generate YARA rules for malware scanning and pattern matching

Forensics & Binary

File analysis, hex viewing, and metadata extraction — 14 tools

Display file bytes in hexadecimal format with offset and ASCII columns

Magic Bytes Detector

Identify file type by checking magic byte signatures

Strings Extractor

Extract readable ASCII/Unicode strings from binary files

File Hash Calculator

Compute cryptographic hashes (MD5, SHA-1, SHA-256, etc.) for uploaded files

Entropy Heatmap Visualizer

Show entropy distribution to detect compressed/encrypted regions

Parse Windows Portable Executable (PE) structure and headers

ELF File Parser

Parse Linux ELF (Executable and Linkable Format) headers

Parse macOS Mach-O executable headers and architecture

EXIF Metadata Extractor

Extract camera, GPS, and timestamp metadata from images (JPEG, PNG, WEBP)

EXIF Metadata Remover

Strip metadata from images for privacy (re-encodes image)

Scan and decode QR codes from uploaded images (cross-browser compatible)

Decode barcodes (Code128, EAN, UPC, QR, etc.) from images (cross-browser compatible)

Image to ASCII Art

Convert uploaded images into ASCII art using brightness mapping

File Signature Lookup

Look up file type magic bytes (hex signatures) or identify file type from hex input

Security Testing

Payload generators and cheatsheets for authorized security testing — 12 tools

XSS Payload Generator

Generate XSS test payloads with various encodings (for authorized testing)

SQL Injection Cheatsheet

Common SQLi payloads organized by database type (for authorized testing)

Reverse Shell Generator

Generate reverse shell commands for various languages (for authorized testing)

SSRF URL Generator

Generate SSRF test URLs including localhost bypasses and cloud metadata (for authorized testing)

Unicode Confusables

Generate lookalike Unicode characters for homograph attacks (for awareness/testing)

Command Injection Cheatsheet

OS command injection payloads for Linux/Windows (for authorized testing)

LFI/Path Traversal Cheatsheet

Local File Inclusion and path traversal payloads (for authorized testing)

XXE Payload Generator

XML External Entity injection payloads (for authorized testing)

SSTI Payload Generator

Server-Side Template Injection payloads (for authorized testing)

Open Redirect Cheatsheet

URL redirect bypass payloads (for authorized testing)

CRLF Injection Cheatsheet

Carriage Return Line Feed injection payloads (for authorized testing)

IDOR/Access Control Cheatsheet

IDOR and broken access control test patterns (for authorized testing)