Fast, Secure, Ready-to-use
Modern Web Toolbox
No installation or sign-up needed. Pure client-side computation with sub-second response, designed for complete privacy.
Dual-Version Bible Reader
Built-in KJV and WEB translations with split-screen comparison and rapid chapter navigation. 100% offline study.
LAN Transfer
Fast, peer-to-peer file & clipboard transfer across devices via WebRTC without servers.
Word to PDF
Convert Word (.docx) to PDF instantly in browser using WebAssembly. Files never leave your device.
SQLite Database Studio
Desktop-grade pure client-side SQLite GUI studio with in-place local saving, data grid inline editing, transactional apply, and SQL console.
QR Code Generator
Generate custom QR codes for text, WiFi, or vCards with custom colors, margins, and SVG/PNG export.
Markdown Studio
All-in-one local Markdown Studio with live preview, sync scrolling, TOC, stats, PDF/HTML export, and WeChat inliner.
JSON / JSONC Formatter & Minifier
Blazingly fast pure-local JSON formatter & minifier powered by WebAssembly. Supports JSONC with single-line & multi-line comments with zero network uploads.
Markdown to Word (DOCX)
Compile Markdown directly to standard Microsoft Word (.docx) documents in pure client-side WebAssembly, supporting headings, tables, code blocks, and formatting.
Private E-Book Reader
Import EPUB, TXT, and Markdown files locally for zero-upload offline private reading.
SQL Query Formatter & Beautifier
Format, indent and beautify SQL statements locally in browser memory. Supports keyword uppercase conversion for MySQL, PostgreSQL, SQLite, and more.
XML / SVG Formatter & Cleaner
Efficiently parse and indent XML and SVG trees. Strips redundant whitespace or minifies tags while validating structure.
YAML / YML Formatter
Local validation and indentation alignment for YAML/YML files, perfect for Kubernetes manifests, Docker Compose, and CI/CD pipelines.
TOML Config Formatter
High-fidelity TOML formatting for Cargo.toml and pyproject.toml, keeping tables and keys neat and organized.
Java Properties Formatter
Format and standardize Java / Spring .properties configuration files with proper escaping and clean key-value layout.
INI Configuration Formatter
Structure and beautify INI files with clear section headers, aligned properties, and normalized blank lines.
DuckDB SQL Query Console
Purely local multi-tab SQL editor with instant OLAP queries, syntax highlighting and interactive data grid.
Tables & Metadata Explorer
Inspect DuckDB tables, views, column data types, metrics and schema definitions.
Parquet & CSV Data Loader
Drag & drop local Parquet, CSV, JSON, Arrow files to infer schemas and mount as tables.
Data Exporter & Converter
Export query results or tables to Parquet, CSV, JSON, and Excel formats in browser memory.
Hash & Big File Check
Instant MD5, SHA-1/256/512, CRC32, and SM3 hashes. Stream multi-GB files without memory overhead.
Offline JWT Inspector
Decode and inspect JWT Header & Payload locally with expiration checks. Never leaks tokens.
Secure Password Generator
Generate cryptographically secure random passwords with customizable lengths and character rules.
ID Photo Watermark
Add dense tiled anti-theft watermarks to IDs and licenses locally to prevent identity theft.
Barcode Generator
Generate standard 1D barcodes including Code 128, EAN-13, and Code 39 in SVG and PNG formats.
Base64 Encoder/Decoder
Fast encode/decode for standard and URL-Safe Base64 with full UTF-8 multilingual support.
Charset & Hex Converter
Lossless conversion between GBK, GB2312, UTF-8, and Hex byte strings to resolve garbled text.
JSON, YAML & TOML
Convert bidirectionally between JSON, YAML, and TOML with syntax error detection and formatting.
EXIF Cleaner & Inspector
Inspect hidden GPS coordinates and camera metadata in photos, and strip EXIF data for privacy.
HTML to Markdown
Convert HTML or rich web text into clean, standardized Markdown locally with table and code block support.
Image Converter & Favicon
Convert images locally between PNG, JPG, WebP, BMP, and generate website favicon.ico files.
Markdown Diff Inspector
Compare two Markdown documents locally with line-by-line colored diff inspection and change stats.
Front-matter Inspector
Parse and inspect YAML front-matter metadata for static blogs (Hexo, Hugo, VitePress) with form editing.
Typography & Spacing Linter
Auto-insert spacing between CJK and English/numbers, collapse blank lines, protecting code blocks.
MD Table & Excel Converter
Convert Excel/CSV to Markdown tables with CJK visual width alignment, and export back to CSV.
Barcode & QR Scanner
Instantly scan and decode QR codes and barcodes from images completely offline.
SQLite Schema Diff & Migration
Compare schemas between two SQLite databases and auto-generate migration SQL scripts locally.
SQLite Mock Data Generator
Intelligently generate hundreds or thousands of realistic test rows for SQLite tables.
URL, HTML & Unicode
URL encode/decode, HTML entity escape/unescape, and Unicode (\uXXXX) text converter.
UUID & NanoID Generator
Batch generate RFC 4122 UUID v4 and URL-friendly NanoID locally for developers and testing.
Pure Client WebAssembly
Calculations and file conversions execute locally in WebAssembly. No cloud queues, zero server bandwidth consumption.
100% Privacy & Zero Upload
We respect your privacy. P2P transfers via WebRTC direct stream, and document rendering stays in local memory.
Pluggable Micro-Modules
Engineered with a modular plugin architecture. Independently deployed, extensible, and lightning-fast.
Privacy-First Online Web Utilities Without Server Uploads
BoxyKit delivers a comprehensive suite of developer, document, and privacy tools running completely in your browser sandbox. Your data and files never leave your computer.
Pure In-Memory Sandbox
Executes inside browser-level isolated WebAssembly virtual memory spaces and dedicated Web Worker threads. File parsing, cryptographic hashing (MD5, SM3, SHA-256), and database queries run exclusively in volatile RAM. Upon session close or tab exit, all memory buffers are instantaneously released by the operating system, physically precluding disk residue and recovery.
Zero Server Transit
Completely eliminates upload intermediaries by utilizing local WASM binaries and direct WebRTC peer-to-peer data channels. All computational logic is packaged statically and cached via CacheStorage. You can disconnect your network connection or switch to airplane mode—every utility continues executing in a fully air-gapped, zero-leakage local environment.
No Sign-Up & No Paywalls
Because computations leverage client-side SIMD hardware acceleration instead of incurring recurring server cloud compute costs, BoxyKit imposes zero subscription paywalls, no login barriers, and no artificial file size caps. Throughput scales linearly with your local workstation’s processor and memory bandwidth.
Frequently Asked Questions (FAQ)
Everything you need to know about client-side privacy and offline execution
What makes BoxyKit different from other online tools?
Unlike traditional web tools that upload your files to remote servers, BoxyKit uses client-side WebAssembly (WASM). All computations, parsing, and rendering execute locally on your device, ensuring complete privacy, zero upload lag, and disconnected offline capability.
Does BoxyKit upload, store, or track my data?
No. BoxyKit enforces a strict zero-upload architecture. Your documents, passwords, cryptographic keys, databases, and books never leave your device. All calculations occur inside your browser memory sandbox.
Can I use BoxyKit offline without internet access?
Yes. Once loaded, BoxyKit's core tools cache necessary WebAssembly modules locally. You can disconnect your network or turn on airplane mode, and tools like Word to PDF, SQLite Studio, and Libris Reader will continue functioning seamlessly.
Are there any file size limits or usage restrictions?
BoxyKit has no artificial paywalls, file size limits, or daily usage quotas. Performance and capacity depend solely on your local device hardware and browser memory.
Do I need to create an account or install plugins?
No registration, email, or account creation is required. All tools are open and ready to use immediately upon opening the page, with zero desktop software installation needed.
Which devices and operating systems are supported?
BoxyKit works across all modern browsers supporting WebAssembly, including Chrome, Safari, Edge, and Firefox on Windows, macOS, Linux, iOS, and Android.