Zero Data Retention — Your Data is Never Stored
JoyTools — Free Online Developer & Business Utilities
Format SQL, beautify JSON, merge PDFs, calculate e-commerce fees, and convert images. Most tools process 100% locally in your browser — and for server-assisted tools, your data is never stored.
Welcome to JoyTools (officially hosted at tools.joydii.com), a privacy-first collection of 104+ browser-based utilities. Most tools on JoyTools run 100% locally in your browser. For tools that use our servers for better quality, your data is never stored — processing is ephemeral and files are deleted immediately after completion.
104+free tools•0server uploads•100%private
Lightning Fast
All processing happens instantly in your browser — zero network latency.
Zero Data Retention
Most tools run 100% in your browser. Server-assisted tools delete your data immediately — never stored, never logged.
Learn more →Works Everywhere
No installation needed. Works on Chrome, Firefox, Safari, Edge, and mobile.
Always Free
All 104+ tools are completely free with no usage limits or sign-ups required.
Learn more →Popular & High-Demand Tools
PDF
PDF Merge
Combine multiple PDF files into a single document. Drag to reorder pages before merging.
100% Client-Side Private
PDF
PDF Compress
Reduce the file size of your PDF documents by stripping metadata and optimizing internal structures.
100% Client-Side Private
Developer
QR Code Generator
Generate QR codes with custom colors, error correction levels. Download as PNG or SVG.
100% Client-Side Private
Developer
Password Generator
Generate strong random passwords with custom length, character sets, and bit entropy meter.
100% Client-Side Private
JSON
JSON Formatter
Format, validate, and minify JSON data instantly. Detect syntax errors with precise line and column information.
100% Client-Side Private
Media
AI Background Remover
Remove photo backgrounds automatically with AI neural network precision. Instant transparent PNG download.
Cloud Processing
SQL
SQL Formatter
Format and beautify SQL queries with support for multiple dialects including PostgreSQL, MySQL, SQLite, and more.
100% Client-Side Private
Media
Image Compressor
Compress JPEG, PNG, and WebP images locally in your browser with adjustable quality presets.
100% Client-Side Private
PDF
PDF Merge
Combine multiple PDF files into a single document. Drag to reorder pages before merging.
100% Client-Side Private
PDF
PDF Split
Split a PDF into multiple files by specifying custom page ranges to extract.
100% Client-Side Private
PDF
PDF Compress
Reduce the file size of your PDF documents by stripping metadata and optimizing internal structures.
100% Client-Side Private
PDF
Compress PDF to 1MB
Shrink PDF documents under the strict 1MB (1,024 KB) upload limit for visa, scholarship, government, and job portals.
100% Client-Side Private
PDF
Compress PDF for Email
Optimize oversized PDF reports and pitch decks at 150 DPI for Gmail, Outlook, and corporate Exchange attachments (<10MB).
100% Client-Side Private
PDF
PDF to Text
Extract all text content from a PDF document, organized page by page.
100% Client-Side Private
PDF
PDF to Image
Convert PDF pages to high-quality PNG, JPEG, or WebP images with customizable DPI resolution.
100% Client-Side Private
PDF
PDF to JPG Converter
Convert PDF pages into high-resolution JPG images (72, 150, or 300 DPI) locally in your browser with single or ZIP download.
100% Client-Side Private
PDF
Image to PDF
Convert JPEG, PNG, and WebP images to a single PDF document with customizable page sizes.
100% Client-Side Private
PDF
JPG to PDF Converter
Combine one or multiple JPG/JPEG photos into a single A4, US Letter, or Fit-to-Image PDF document in your browser.
100% Client-Side Private
PDF
Rotate PDF
Rotate PDF pages by 90°, 180°, or 270°. Select all pages or specific ones.
100% Client-Side Private
PDF
PDF Watermark & Numbers
Stamp custom text watermarks, confidential overlays, and page numbers onto PDF documents in browser.
100% Client-Side Private
Developer
(47 tools)Developer
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to text. Supports Unicode UTF-8 and URL-Safe modes.
100% Client-Side Private
Developer
UUID v4 / v7 Generator
Generate cryptographically secure UUID v4, time-sorted UUID v7, UUID v1, and deterministic UUID v5 in single or bulk batches.
100% Client-Side Private
Developer
Password Generator
Generate strong random passwords with custom length, character sets, and bit entropy meter.
100% Client-Side Private
Developer
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hash digests from text or files.
100% Client-Side Private
Developer
CSV ↔ JSON
Convert between CSV and JSON formats with PapaParse engine. Auto-detection and dynamic typing.
100% Client-Side Private
Developer
CSV to JSON Converter
Convert CSV spreadsheets and delimited text into structured JSON arrays with auto-delimiter and dynamic data type detection.
100% Client-Side Private
Developer
JSON to CSV Converter
Convert JSON object arrays into RFC 4180 compliant CSV spreadsheets ready for Excel, Google Sheets, and SQL imports.
100% Client-Side Private
Developer
QR Code Generator
Generate QR codes with custom colors, error correction levels. Download as PNG or SVG.
100% Client-Side Private
Developer
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, signature, and expiration status.
100% Client-Side Private
Developer
Timestamp Converter
Convert between Unix timestamps and human-readable dates. Live clock with ISO 8601 and relative time.
100% Client-Side Private
Developer
URL Encoder / Decoder
Encode and decode URL strings with encodeURIComponent, encodeURI, and Base64URL modes.
100% Client-Side Private
Developer
Color Converter
Convert colors between HEX, RGB, and HSL formats with visual picker and quick presets.
100% Client-Side Private
Developer
Regex Tester
Test regular expressions with live match highlighting, match details, and preset patterns.
100% Client-Side Private
Developer
XML Formatter
Format, validate, and minify XML documents. Powered by xml-formatter for robust processing.
100% Client-Side Private
Developer
Cron Expression Generator
Build, validate, and understand cron expressions with human-readable descriptions and next runs.
100% Client-Side Private
Developer
cURL to Code Converter
Convert cURL commands into JavaScript (Fetch, Axios), Python (requests, httpx), Go, Rust, and PHP code.
100% Client-Side Private
Developer
cURL to Python Requests Converter
Convert cURL commands with Bearer tokens, custom headers, and JSON payloads into clean Python requests code locally in your browser.
100% Client-Side Private
Developer
cURL to JavaScript Fetch Converter
Transform cURL commands into modern JavaScript and Node.js 20+ Fetch API calls with typed headers and JSON.stringify payloads.
100% Client-Side Private
Developer
cURL to Axios Request Converter
Convert cURL commands into Axios request config objects (method, url, headers, data) for Node.js and TypeScript projects.
100% Client-Side Private
Developer
cURL to Go (net/http) Converter
Convert cURL commands into idiomatic Golang net/http code (http.NewRequest, strings.NewReader, req.Header.Set) in your browser.
100% Client-Side Private
Developer
HTML to React JSX
Transform raw HTML snippets into valid React JSX/TSX components. Auto-converts class to className and style objects.
100% Client-Side Private
Developer
HMAC Signature Generator
Generate and verify HMAC signatures (HMAC-SHA256, HMAC-SHA512) for Stripe, GitHub, Shopify, and Webhook verification.
100% Client-Side Private
Developer
Stripe Webhook Signature Verifier
Generate and verify Stripe Stripe-Signature (t=timestamp,v1=hex) HMAC-SHA256 webhook headers over ${timestamp}.${raw_body} in browser.
100% Client-Side Private
Developer
Shopify Webhook HMAC Verifier (Base64)
Compute and verify Base64-encoded X-Shopify-Hmac-Sha256 webhook signatures for Shopify orders/create and GDPR webhooks in browser.
100% Client-Side Private
Developer
GitHub Webhook Signature Tester
Compute and verify GitHub X-Hub-Signature-256 (sha256=<hex>) HMAC-SHA256 webhook headers for push and pull_request events.
100% Client-Side Private
Developer
IPv4 CIDR Calculator
Calculate network address, broadcast address, subnet mask, wildcard mask, and usable host range from CIDR notation.
100% Client-Side Private
Developer
Code Formatter
Format and beautify JavaScript, TypeScript, HTML, CSS, and Python code online with Prettier engine.
100% Client-Side Private
Developer
TypeScript & TSX Code Formatter
Format and beautify TypeScript (.ts) and React TSX (.tsx) code locally in your browser using the Prettier TypeScript AST parser.
100% Client-Side Private
Developer
Python PEP 8 Code Formatter
Format, indent, and beautify Python 3 scripts, functions, and classes to PEP 8 4-space indentation standards locally in your browser.
100% Client-Side Private
Developer
Code Minifier
Minify and compress JavaScript, HTML, and CSS code online with Terser engine. Reduce payload size by up to 70%.
100% Client-Side Private
Developer
JavaScript Minifier
Minify and compress JavaScript files online with Terser engine. Mangle variable names and drop console logs.
100% Client-Side Private
Developer
Number Base & Bitwise Converter
Convert between Binary, Octal, Decimal, Hexadecimal, and ASCII text. Compute bitwise AND, OR, XOR, NOT operations.
100% Client-Side Private
Developer
Universal Unit Converter
Convert Length, Mass, Temperature, Digital Data Storage (Bytes to Terabytes), and Speed units online.
100% Client-Side Private
Developer
Color Palette Generator
Generate HSL color harmonies (Monochromatic, Analogous, Complementary) and Tailwind CSS 10-shade scale palettes online.
100% Client-Side Private
Developer
WCAG Contrast Checker
Calculate relative luminance and test WCAG 2.1 AA/AAA text accessibility contrast ratio compliance online.
100% Client-Side Private
Developer
JSON to TypeScript & Zod Schema Generator
Convert JSON objects into typed TypeScript interface definitions or Zod validation schemas instantly.
100% Client-Side Private
Developer
CSS & Tailwind Glassmorphism Studio
Design frosted glass UI cards with real-time sliders for backdrop blur, opacity, border, and box-shadow.
100% Client-Side Private
Developer
Bcrypt & Argon2 Password Hash Generator & Verifier
Generate cryptographically secure Bcrypt password hashes ($2b$) with custom cost rounds, or test password verification.
100% Client-Side Private
Developer
Google, Bing & Baidu SERP Simulator & Pixel Length Checker
Preview live search engine snippet appearances on Google, Bing (Copilot), and Baidu in desktop & mobile viewports.
100% Client-Side Private
Developer
JSON to SQL DDL & INSERT Statement Generator
Convert JSON objects or arrays into CREATE TABLE DDL schemas and INSERT INTO SQL statements for PostgreSQL, MySQL, SQLite, and SQL Server.
100% Client-Side Private
Developer
CSS Flexbox & Tailwind Layout Visual Builder
Interactive Flexbox & CSS Grid visual layout studio. Adjust flex-direction, justify-content, align-items, and gap sliders.
100% Client-Side Private
Developer
Smart String Escaper & Unescaper (JSON, HTML, JS, SQL, Unicode)
Bidirectional escaping and unescaping tool for JSON, HTML Entities, JavaScript, SQL strings, and Unicode characters.
100% Client-Side Private
Developer
OpenAPI to TypeScript & React Query Hooks Generator
Convert OpenAPI 3.0 & Swagger 2.0 (JSON & YAML) specifications into TypeScript interfaces, typed API clients, and TanStack React Query hooks.
100% Client-Side Private
Developer
Mock Data Generator
Generate realistic fake data for testing: JSON, CSV, SQL, XML with 50+ field types — names, emails, UUIDs, dates, addresses. Runs 100% in your browser via Web Worker.
100% Client-Side Private
Developer
REST API Tester
Send HTTP requests (GET, POST, PUT, DELETE) directly from your browser. View response body, headers, status codes, and timing. Export as cURL or Python. No install required.
Hybrid Engine
Developer
.env File Editor
Visual editor for .env files — parse, validate, detect duplicate keys, mask secrets, and generate .env.example templates for Next.js, Django, Laravel, Rails, and more.
100% Client-Side Private
Developer
Database ER Diagram Builder
Design database schemas visually with drag-and-drop or DBML code. Export PostgreSQL, MySQL, and SQLite DDL scripts and download PNG/SVG diagrams. No account needed.
100% Client-Side Private
SQL
(5 tools)SQL
SQL Formatter
Format and beautify SQL queries with support for multiple dialects including PostgreSQL, MySQL, SQLite, and more.
100% Client-Side Private
SQL
PostgreSQL Query Formatter
Format and beautify PostgreSQL queries including WITH CTEs, JSONB operators (->>, @>), :: type casts, and window functions.
100% Client-Side Private
SQL
BigQuery SQL Formatter
Format Google Cloud BigQuery Standard SQL queries with UNNEST(), STRUCT, ARRAY_AGG, EXCEPT, and backtick table identifiers.
100% Client-Side Private
SQL
Oracle PL/SQL Formatter
Indent and beautify Oracle PL/SQL stored procedures, DECLARE...BEGIN...EXCEPTION...END blocks, packages, and %TYPE declarations.
100% Client-Side Private
SQL
Snowflake SQL Formatter
Format Snowflake Data Cloud SQL queries including LATERAL FLATTEN, VARIANT semi-structured paths (v:attr::string), and QUALIFY clauses.
100% Client-Side Private
JSON
(1 tool)YAML
(1 tool)Media
(16 tools)Media
Image Compressor
Compress JPEG, PNG, and WebP images locally in your browser with adjustable quality presets.
100% Client-Side Private
Media
Compress Image to 100KB
Shrink JPEG, PNG, and WebP photos strictly under 100KB (102,400 bytes) in your browser using automatic binary-search quality optimization.
100% Client-Side Private
Media
Compress Image to 50KB
Compress ID photos, digital signatures, and exam portal images strictly under 50KB (20KB–50KB range) locally in your browser.
100% Client-Side Private
Media
AI Background Remover
Remove photo backgrounds automatically with AI neural network precision. Instant transparent PNG download.
Cloud Processing
Media
Resize Image
Resize images to exact dimensions with high-quality browser canvas resampling and aspect ratio lock.
100% Client-Side Private
Media
Discord Emoji Resizer (128x128)
Resize and pad images to Discord's 128x128px custom emoji specification with transparent square padding under 256KB.
100% Client-Side Private
Media
Shopify Product Image Resizer (2048x2048)
Standardize e-commerce product photos into 2048x2048px 1:1 squares with pure white #FFFFFF padding and WebP optimization.
100% Client-Side Private
Media
YouTube Thumbnail Resizer (1280x720)
Resize images to YouTube Studio's official 1280x720px (16:9 HD) thumbnail dimensions under the strict 2MB upload limit.
100% Client-Side Private
Media
2x2 Inch Passport Photo Resizer (600x600)
Convert portrait photos into exact 600x600px (2x2 inch at 300 DPI) square JPEGs under 240KB for US Visa DS-160 and Passport portals.
100% Client-Side Private
Media
Image Converter & EXIF Stripper
Convert PNG, JPG, WebP images, crop dimensions, and strip 100% of sensitive GPS camera EXIF metadata.
100% Client-Side Private
Media
PNG to WebP Converter
Convert PNG and JPEG images to Google WebP format locally in your browser with adjustable compression quality and transparency support.
100% Client-Side Private
Media
Remove EXIF Data & GPS Location
Strip hidden EXIF metadata, GPS coordinates, camera serial numbers, and capture timestamps from JPEG, PNG, and WebP photos in browser.
100% Client-Side Private
Media
Favicon Generator Suite
Generate full favicon package (16x16, 32x32, 180x180 Apple Touch, 512x512 Android) and webmanifest ZIP download.
100% Client-Side Private
Media
SVG to High-Res PNG / WebP & React JSX Converter
Render SVG vectors to ultra-high-resolution PNG or WebP images up to 8K, or convert SVG to React JSX components.
100% Client-Side Private
Media
Base64 Image & Data URI Converter
Convert images to Data URIs (data:image/png;base64,...), HTML <img> tags, and CSS background-image snippets.
100% Client-Side Private
Media
Image to Text (OCR) Converter
Extract text from images online with Tesseract OCR. Supports 12 languages: English, Vietnamese, Japanese, Korean, Chinese and more.
Cloud Processing
Text
(7 tools)Text
Case Converter
Convert text between UPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case, and CONSTANT_CASE.
100% Client-Side Private
Text
Word Counter
Count words, characters, sentences, and paragraphs in real time with estimated reading time.
100% Client-Side Private
Text
Text Diff
Compare two texts side by side and see differences highlighted line by line, like a GitHub diff.
100% Client-Side Private
Text
Lorem Ipsum
Generate placeholder text in paragraphs, sentences, or words for your designs and prototypes.
100% Client-Side Private
Text
Markdown Preview
Write and preview GitHub Flavored Markdown in real-time with split, edit, and preview modes.
100% Client-Side Private
Text
Smart Text Cleaner
Deduplicate lines, strip HTML tags, unescape entities, and sort text lists alphabetically in real time.
100% Client-Side Private
Text
Markdown to HTML & Printable A4 PDF Converter
Convert GFM Markdown text into styled HTML markup or print formatted documents to A4 PDF with custom themes.
100% Client-Side Private
Finance & Business
(10 tools)Finance & Business
Dropshipping & E-Commerce Profit Calculator
Calculate net profit margins, ROI, and break-even selling prices for Amazon FBA, Shopee, TikTok Shop & Shopify stores.
100% Client-Side Private
Finance & Business
Shopee Seller Fee & Net Profit Calculator
Calculate Shopee Mall & Regular seller payment fees, service commission, FreeShip Xtra, Voucher Xtra, and net profit margins in VND or USD.
100% Client-Side Private
Finance & Business
TikTok Shop Profit, Affiliate & ROAS Calculator
Calculate TikTok Shop seller referral commission, affiliate creator commission, ad CPA, and break-even ROAS before launching campaigns.
100% Client-Side Private
Finance & Business
Amazon FBA Revenue, Fee & Net Margin Calculator
Calculate Amazon FBA referral commissions (8%–15%), fulfillment pick-and-pack fees, landed COGS, PPC ACOS/ROAS, and unit net profit.
100% Client-Side Private
Finance & Business
Invoice Tax & Multi-Currency Converter
Convert invoice amounts across 8 major currencies with real-time VAT and Sales Tax calculations.
100% Client-Side Private
Finance & Business
VAT & Sales Tax Calculator (Net to Gross)
Calculate standard VAT (8%, 10%, 20%), GST, and Gross invoice totals from Net prices across 30+ global currencies.
100% Client-Side Private
Finance & Business
Reverse VAT Calculator (Remove VAT from Gross)
Extract pre-tax Net price and exact VAT tax amount from VAT-inclusive Gross totals using standard reverse tax formulas.
100% Client-Side Private
Finance & Business
Mortgage & Loan Amortization Calculator
Calculate monthly home loan payments, interest payoff schedules, and amortization matrices for 15-year or 30-year mortgages.
100% Client-Side Private
Finance & Business
Net to Gross Salary & Payroll Tax Calculator
Convert Gross to Net salary or Net to Gross salary with insurance contribution breakdowns and progressive tax bracket calculations.
100% Client-Side Private
Finance & Business
Gross to Net Salary Calculator (Vietnam PIT & Insurance)
Calculate Vietnam Gross to Net take-home salary with 10.5% employee insurance (BHXH, BHYT, BHTN), family deductions, and 7-tier PIT.
100% Client-Side Private
AI Tools
(5 tools)AI Tools
AI Prompt Builder
Build, customize, and test AI prompts with curated templates across coding, writing, marketing, and data analysis. Estimate token costs for GPT-4o, Claude, and Gemini.
100% Client-Side Private
AI Tools
AI Token Counter & LLM Cost Calculator
Estimate BPE token counts and calculate API costs for OpenAI (GPT-4o), Anthropic (Claude 3.5), and Gemini 1.5.
100% Client-Side Private
AI Tools
OpenAI GPT-4o & o3 Token Counter
Count OpenAI o200k_base BPE tokens and calculate Input, 50% Cached Input, and Output API costs for GPT-4o, GPT-4o mini, and o3-mini.
100% Client-Side Private
AI Tools
Anthropic Claude 3.7 Token Counter
Estimate Claude BPE token counts, 200K context usage, and 90% Prompt Caching read discounts for Claude 3.7 Sonnet, 3.5 Sonnet, and Haiku.
100% Client-Side Private
AI Tools
Google Gemini 2M Token Calculator
Calculate Google Gemini 2.5 Pro, 1.5 Pro, and 2.0 Flash SentencePiece tokens, 258-token image tiles, and 75% Context Caching costs.
100% Client-Side Private
From the same makers
Joydii.com
Vietnam Travel Blog
Explore Vietnam through the eyes of a local — from the Dragon Bridge in Da Nang to the misty peaks of Ha Long Bay.
- Da Nang, Ha Long Bay, Hoi An
- Authentic local travel guides
- Customized Vietnam itineraries
Same privacy-first values. Zero tracking. 100% authentic content.
Da Nang
Hoi An