Stop pasting sensitive data into random tools.

74 free tools. Encryption, encoding, and file work runs in your browser.

AES, JWT, Base64, SHA, Regex, and the rest — each page documents the script that actually runs.

Crypto Hub Encoding Hub Converter Hub Dev Hub Image Hub

Crypto Hub

Encryption, decryption, and hashing tools

AES Encryption Tool

Encrypt text with AES-128, 192, or 256-bit keys — 100% client-side

AES Decryption Tool

Decrypt AES-encrypted ciphertext — supports Base64 and Hex input

SHA-256 Hash Generator

Generate SHA-256 cryptographic hashes instantly — Hex or Base64 output

SHA-512 Hash Generator

Generate SHA-512 cryptographic hashes — stronger than SHA-256

SHA-1 Hash Generator

Generate SHA-1 hashes — for legacy compatibility checks

SHA-3 Hash Generator

Generate SHA-3 (Keccak) hashes — the NIST standard successor

MD5 Hash Generator

Generate MD5 checksums — fast, widely supported, not for passwords

RIPEMD-160 Hash Generator

Generate RIPEMD-160 hashes — used in Bitcoin address generation

Generate HMAC message authentication codes — SHA256, SHA512, SHA1, MD5

RSA Key Pair Generator

Generate RSA public & private key pairs — 1024, 2048, or 4096-bit

Hash Comparator & Verifier

Compare and verify hash values — MD5, SHA-256, SHA-512 and more

Checksum Generator

Generate checksums for data integrity verification

Bcrypt Hash Generator

Hash passwords with bcrypt — configure cost factor, verify hashes

RSA Encrypt & Decrypt

Encrypt with RSA public key, decrypt with private key — OAEP padding

Password Strength Checker

Real-time password analysis with entropy, crack time, and improvement tips

Generate time-based one-time passwords for two-factor authentication

SSL Certificate Decoder

Decode PEM X.509 certificates — view subject, issuer, validity, and serial

Build and sign JWTs with custom claims — HS256 via Web Crypto API

Encoding Hub

Encoding, decoding, and data format tools

Encode text or binary data to Base64 — standard and URL-safe variants

Decode Base64 strings back to plain text or binary data

Percent-encode URLs and query strings for safe transmission

Decode percent-encoded URLs back to readable query strings

HTML Entity Encoder

Escape HTML special characters to prevent XSS and display issues

HTML Entity Decoder

Decode HTML entities back to their original characters

Convert text to hexadecimal — useful for debugging and binary inspection

Decode hexadecimal strings back to plain text

Convert text to binary representation — byte by byte

Decode binary strings back to readable text

JSON Formatter & Validator

Beautify and validate JSON data — with syntax highlighting and error detection

Minify JSON by removing whitespace — reduce payload size

JSON Schema Validator

Validate JSON data against a schema — supports type, required, pattern, and more

Format and minify XML — with validation and proper indentation

Format, validate, and minify YAML — with syntax error detection

Format and minify HTML — with proper tag indentation

Converter Hub

Data format conversion and file transformation tools

XML to JSON Converter

Convert XML data to JSON format — fast, free, client-side

JSON to XML Converter

Convert JSON data to XML format — browser-based, no server

CSV to JSON Converter

Convert CSV data to JSON — paste your CSV, get instant JSON

YAML to JSON Converter

Convert YAML to JSON — for config files, CI/CD, and API schemas

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal

JSON to CSV Converter

Convert JSON arrays to CSV with proper escaping — download as .csv

Markdown to PDF

Convert Markdown to downloadable PDF — headings, lists, and basic formatting

CSV to Excel Converter

Convert CSV data to downloadable .xlsx files — with live table preview

DOCX to HTML Converter

Convert Word .docx files to clean HTML — preview and source view

Dev Hub

Developer utilities and generators

JWT Decoder & Inspector

Decode and inspect JWT tokens — header, payload, claims at a glance

Create and sign JWT tokens with custom claims and headers

UUID / GUID Generator

Generate UUID v4, v1, and bulk UUIDs — cryptographically secure

Random Password Generator

Generate strong, cryptographically secure passwords — customizable length and charset

Random String Generator

Generate random strings, API keys, and tokens — custom length and charset

Unix Timestamp Converter

Convert Unix timestamps to dates and dates to timestamps — with timezone support

Cron Expression Generator

Build and validate cron expressions visually — no syntax memorization needed

Cron Expression Explainer

Understand any cron expression in plain English — with next run times

HTTP Header Parser

Parse and analyze raw HTTP request or response headers

Test and debug regular expressions in real-time — with match highlighting

Lorem Ipsum Generator

Generate lorem ipsum placeholder text — by word, sentence, or paragraph count

Format and beautify SQL queries — supports MySQL, PostgreSQL, SQLite

Markdown Previewer

Preview markdown in real-time — GitHub-flavored Markdown support

Text Diff Checker

Compare two text blocks and highlight differences line by line

Word & Character Counter

Count words, characters, sentences, and estimate reading time

IP Address Tools

Subnet calculator, CIDR converter, and IPv4/IPv6 address analysis

Gzip Compress / Decompress

Compress or decompress text with Gzip — shows compression ratio

Complete ASCII reference chart — decimal, hex, octal, binary, and descriptions

Bit / Byte Calculator

Convert between bits, bytes, KB, MB, GB, TB — SI and IEC units

Query DNS records (A, AAAA, MX, NS, TXT, SOA) via Google DNS-over-HTTPS

Epoch Converter

Convert Unix timestamps to dates and back — live clock, auto-detect s/ms

Format and minify CSS — with @media and nested rule support

JavaScript Minifier

Minify and format JavaScript — with size reduction stats

Live Chess Analysis & Eval Bar — Board Analyzer Online

Live eval bar, Stockfish analysis, screenshot-to-FEN — all free, instant, no signup

Image Hub

Image editing, conversion, and visual tools

Color Code Converter

Convert HEX, RGB, RGBA, HSL, HSV color codes — with visual preview

QR Code Generator

Generate QR codes from text, URLs, or any data — customize size and colors

SVG to PNG Converter

Convert SVG markup to PNG with adjustable scale — 100% client-side

Image Format Converter

Convert images between PNG, JPEG, WebP, and HEIC — adjust quality, all client-side

Resize images to exact dimensions — lock aspect ratio, choose output format

Color Palette Generator

Generate color palettes with harmonies — complementary, analogous, triadic, monochrome

Image Filters & Effects

Sharpen, brighten, contrast, grayscale, sepia, and invert. Canvas API, instant.

What you are looking at

These are tools maintained in this project, not copies of another site’s articles with a widget dropped on top. Each tool page has notes written against the script in the repository: the mode AES actually offers, the fact that Base64 is not encryption, the difference between a file checksum and a hash of the file name.

A handful of addresses used to repeat one converter with the format names swapped (PNG to JPG, HEIC to WebP, decimal to hex, JSON to YAML). Those URLs now send you to the single converter they always loaded. The chess board is an embedded app, so that screen does not carry ads. DNS lookup is the exception to the local rule: it sends the hostname you type to Google Public DNS, and the DNS page says so.

Longer writing lives on the blog. Who maintains the tools is on the about page. Advertising and analytics are described in the privacy policy. Tool fields are not uploaded with those requests.