Free Online Tools
Fast, Privacy-First, Browser-Based
1182+ tools for developers, designers, and everyday tasks. Most tools run in your browser — your data stays on your device. Some tools require external services.
Popular Tools
Base64 Encode & Decode
Encode and decode Base64 with UTF-8 support. Instant, private, browser-based. No upload, no signup.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case and kebab-case.
Hash Generator
Generate SHA-256, SHA-1, SHA-512 and SHA-384 hashes from any text. Uses Web Crypto API, fully private.
JSON Formatter
Format, beautify and validate JSON instantly in your browser. No upload, fully private.
JWT Decoder
Decode JWT tokens and inspect the header and payload. See the decoded JSON content instantly.
Password Generator
Generate strong, random passwords with customizable length and character sets. Uses crypto.getRandomValues.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports ISO 8601 format.
URL Encode & Decode
Encode and decode URL (percent-encoding) with UTF-8 support. Instant, private, browser-based. No upload, no signup.
UUID Generator
Generate random UUIDs (v4) instantly in your browser. No upload, fully private.
Color Picker
Pick colors and get HEX, RGB, and HSL values in your browser. Free, online, no upload, fully private.
Image Compressor
Compress images in your browser to reduce file size. Adjust quality and download the optimized image. Free, private, no upload.
Image Resizer
Resize images in your browser. Set custom dimensions or maintain aspect ratio. Download the resized image.
JSON Validator
Free online json validator. Process data instantly in your browser. No upload, no signup, fully private.
Regex Tester
Test regular expressions against any text in real-time. See all matches instantly with match count.
Text Diff Checker
Compare two pieces of text and see the differences highlighted. Added and removed lines are color-coded.
Word Counter
Count words, characters, sentences and paragraphs in your text instantly. No upload, fully private.
Browse by Category
Developer Tools
JSON, Base64, hash, JWT, regex, code formatter and utilities for software developers. All run privately in your browser with instant results. Free, no signup.
Text Tools
Count words, convert case, remove duplicates, sort lines and transform text for writers and developers. All run privately in your browser. Free, no signup.
Converter Tools
Convert between units, formats, number bases, encodings, and file types. Length, weight, temperature converters. All run in your browser. Free, no signup.
Image Tools
Resize, compress, convert, crop, rotate and edit images entirely in your browser. No upload required.
PDF Tools
Merge, split, compress, convert and manipulate PDF files locally. Your PDFs never leave your device.
Color Tools
Color tools: HEX, RGB, HSL, CMYK conversion, color picker, palette generator, and contrast checker. All run privately in your browser. Free, no signup.
Calculator Tools
Math, percentage, BMI, loan, scientific, and specialty calculators for everyday use. All run privately in your browser with instant results. Free, no signup.
Generator Tools
UUID, lorem ipsum, placeholder data, random number and custom generators for development and testing. All run privately in your browser. Free, no signup.
Crypto & Encoding Tools
Base64, URL encode/decode, AES, hex, JWT and encoding conversions for developers and security work. All run privately in your browser. Free, no signup required.
Network Tools
Network tools: IP lookup, DNS query, WHOIS, SSL check, HTTP headers, and URL availability diagnostics. Free online utilities, no signup required.
Date & Time Tools
Unix timestamp converter, timezone converter, date difference and calendar utilities for developers. All run privately in your browser. Free, no signup.
Security Tools
Security tools: password generator, hash verifier, entropy checker, and other security utilities. All run privately in your browser. Free, no signup.
Featured Collections
Curated toolsets for common workflows — pick a collection to jump-start your task.
Developer Essentials
JSON, regex, JWT, hash and Base64 — the daily developer toolkit.
JSON Formatter
Format, beautify and validate JSON instantly in your browser. No upload, fully private.
JSON Validator
Free online json validator. Process data instantly in your browser. No upload, no signup, fully private.
Regex Tester
Test regular expressions against any text in real-time. See all matches instantly with match count.
JWT Decoder
Decode JWT tokens and inspect the header and payload. See the decoded JSON content instantly.
Hash Generator
Generate SHA-256, SHA-1, SHA-512 and SHA-384 hashes from any text. Uses Web Crypto API, fully private.
Image Tools
Compress, resize, convert and pick colors from images.
Image Compressor
Compress images in your browser to reduce file size. Adjust quality and download the optimized image. Free, private, no upload.
Image Resizer
Resize images in your browser. Set custom dimensions or maintain aspect ratio. Download the resized image.
Color Picker
Pick colors and get HEX, RGB, and HSL values in your browser. Free, online, no upload, fully private.
Color Converter
Convert colors between HEX, RGB and HSL instantly in your browser. No upload, fully private.
PDF Tools
Merge, split, compress and extract text from PDF documents.
PDF Merger
Merge multiple PDF files into one document. Free, browser-based, no uploads — your files stay private.
PDF Splitter
Split a PDF into multiple files by page range or every N pages. Free, browser-based, no uploads — your file stays private.
PDF Compressor
Free online pdf compressor. Process data instantly in your browser. No upload, no signup, fully private.
PDF to Text Converter
Extract text content from PDF files in your browser. Free, online, no upload, fully private.
Text & Content
Count, transform, diff and convert text content.
Word Counter
Count words, characters, sentences and paragraphs in your text instantly. No upload, fully private.
Character Counter
Count characters, words, sentences, and paragraphs in your text. Free, online, no upload, fully private.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case and kebab-case.
Text Diff Checker
Compare two pieces of text and see the differences highlighted. Added and removed lines are color-coded.
Markdown to HTML
Free online markdown to html. Process data instantly in your browser. No upload, no signup, fully private.
Generators
UUIDs, passwords, timestamps and placeholder text.
UUID Generator
Generate random UUIDs (v4) instantly in your browser. No upload, fully private.
Password Generator
Generate strong, random passwords with customizable length and character sets. Uses crypto.getRandomValues.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports ISO 8601 format.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text with customizable paragraph count. Perfect for mockups and testing.
Security & Crypto
Hashes, passwords, JWT and Base64 for security work.
Hash Generator
Generate SHA-256, SHA-1, SHA-512 and SHA-384 hashes from any text. Uses Web Crypto API, fully private.
Password Generator
Generate strong, random passwords with customizable length and character sets. Uses crypto.getRandomValues.
JWT Decoder
Decode JWT tokens and inspect the header and payload. See the decoded JSON content instantly.
Calculators
Everyday math: percentage, age, BMI and loans.
Percentage Calculator
Calculate percentages easily. Find what is X% of Y, or what percentage X is of Y.
Age Calculator
Calculate exact age in years, months, and days from a birth date. Also shows total days lived.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units. See your weight category instantly.
Loan Calculator
Calculate monthly loan payments, total interest, and total cost. Supports any loan amount and interest rate.
Guides & Tutorials
Learn how each tool works — practical guides, cheat sheets and explanations.
Hashing Algorithms Explained: MD5, SHA-1, SHA-256, SHA-512
Understand cryptographic hash functions: differences between MD5, SHA-1, SHA-256, and SHA-512, and which to use for integrity checks vs password storage.
ReferenceRegular Expressions Cheat Sheet: Syntax, Flags, and Common Patterns
Complete regex reference: metacharacters, character classes, quantifiers, anchors, groups, flags, and ready-to-use patterns for emails, URLs, and dates.
Problem SolvingPassword Security: How to Generate, Store, and Audit Strong Passwords
Solve the most common password security problems: generating strong passwords, hashing them correctly, avoiding reuse, and auditing existing credentials.
ComparisonBase64 vs Hex Encoding: Which Should You Use?
Compare Base64 and Hex encoding across efficiency, readability, use cases, and trade-offs — and learn when to pick each for binary-to-text encoding.
ComparisonCSV vs TSV: Which Delimiter Format Should You Use?
Compare CSV and TSV across delimiter choice, escaping, compatibility, and use cases — and learn when to pick each for tabular data.
How-ToHow to Compress Images Without Losing Quality
Step-by-step guide to compressing images (JPEG, PNG, WebP) to reduce file size without visible quality loss using a free browser-based tool.
How-ToHow to Compress PDF Files Step by Step
Step-by-step guide to compressing PDF files to reduce file size using a free browser-based tool. Learn compression levels and what affects PDF size.
How-ToHow to Convert Colors Between HEX, RGB, and HSL
Step-by-step guide to converting colors between HEX, RGB, HSL, and other formats using a free browser-based tool. Learn when to use each format.
Reference Library
Lookup tables and cheat sheets — JSON syntax, HTTP status, MIME types and more.
JSON Syntax Reference
Complete JSON (RFC 8259) syntax reference with data types, grammar rules, examples, and common errors.
Regular Expressions Cheat Sheet
Quick reference for regular expression syntax including characters, quantifiers, anchors, groups, and common patterns.
HTTP Status Codes Reference
Complete reference of HTTP status codes with descriptions, categories, and usage examples.
MIME Types Reference
Common MIME types (Internet media types) with file extensions and descriptions.
HTML Entities Reference
Common HTML character entities with names, decimal and hex codes.
IANA Time Zones Reference
IANA time zone identifiers with UTC offsets and descriptions for 40 common time zones worldwide.
CSS Named Colors Reference
All CSS named colors with hex and RGB values.
Unix Timestamp Reference
Unix timestamp reference with common milestones, value ranges, and conversion rules.
Private by Design, Free for Everyone
100% Free
No signup, no subscription, no hidden costs. All tools are free to use, forever.
Private by Design
Most tools process data locally in your browser. Your files never leave your device.
Fast & Browser-Based
No downloads or installs. Tools run instantly with Web APIs, Web Workers, and WASM.
Growing Library
1182+ tools across 27 categories, with guides and references.