Online Utility Toolbox
100% client-side secure utilities. Your files never touch our servers.
OCR Text Extractor
Extract printed text from images locally in your browser. Supports English/Chinese, no uploads.
Image Compressor
Compress PNG/JPG/WebP images locally and convert formats safely in your browser.
Image Cropper
Crop images locally with free or preset ratios, rotation, flipping, and scaling. Complete privacy.
PDF Merger & Splitter
Merge multiple PDF files or extract pages locally. Perfect privacy protection.
PDF Add Watermark & Page Number
Batch-add custom text/image watermarks and page numbers to PDF files locally.
PDF Page Cropper
Crop PDF margins or custom sizes locally, supporting single or all pages. Complete privacy.
PDF Page Manager
Reorder, rotate, delete, clone, or merge PDF pages locally. Complete privacy.
PDF Page Resizer
Change PDF page dimensions (A4, Letter, A3, etc.) locally. Support aspect-ratio scaling, alignment choices, and custom sizes. Complete privacy.
PDF & Image Converter
Convert PDF pages to images (PNG/JPG/WebP) or merge multiple images into a single PDF locally. Perfect privacy protection.
JSON Formatter
Format, compress, and validate JSON data with tree view and syntax checking.
ID Photo Cropper
Create ID photos online. Supports preset sizes, face guides, and offline chroma key bg replacement.
ID Photo Layouter
Layout ID photos for print. Supports various photo and paper sizes, calculates optimal tiling, and generates cut marks.
Image Watermarker
Batch-add custom text/image watermarks to images locally. Supports tiling and grid alignment.
GIF Maker & Splitter
Create animated GIFs from images or split GIFs into individual frames locally. Complete privacy.
Base64 Encoder/Decoder
Convert text or images to Base64 and vice versa, 100% client-side with preview.
Text Diff Checker
Compare two text snippets side-by-side or inline with additions and deletions highlighted.
JSON Diff Tool
Compare two JSON objects side-by-side, highlight differences in structure and values.
YAML/JSON Converter
Convert between YAML and JSON formats instantly in both directions with syntax validation.
Regex Tester
Test and debug regular expressions in real-time. Highlights matches and details capture groups.
URL Encoder/Decoder
Encode or decode URL query parameters and components with full UTF-8 support.
Unicode Converter
Convert text to Unicode escape sequences (\uXXXX) and HTML character entities, and vice versa.
UUID Generator
Batch generate RFC 4122-compliant Universally Unique Identifiers (UUID v4) with customization.
QR Code Generator
Generate custom QR codes from URLs or text with styles and custom colors.
Mortgage Calculator
Calculate mortgage payments with latest LPR rates, compare Equal Principal/Interest, and generate amortization schedules.
Salary & Tax Calculator
Calculate net salary after housing fund, social insurance, and income tax deductions across major cities.
Compound Interest Calculator
Analyze compound interest growth with initial principal, recurring deposits, and yield rates. Visualize wealth snowballs.
Text Encrypt / Decrypt
Encrypt and decrypt text locally with AES-256-GCM and PBKDF2. No server uploads.
PDF Encrypt / Decrypt
Password-protect PDFs or remove protection locally with a single password. No uploads.
Image Steganography(Hide text in image)
Hide text in images with LSB steganography. Invisible, 100% client-side.
Text Steganography
Hide secrets with zero-width characters after visible text. Survives copy-paste, local only.
Random Password Generator
Generate strong random passwords locally with crypto.getRandomValues. Custom length and charset.
Screen Recorder
Record screen or window locally in your browser. Pause/resume and export WebM. No uploads.
Video to GIF
Convert video clips to GIF locally. Adjust FPS and size. No uploads.
Image Grayscale & Pixelate
Convert images to grayscale or pixel art locally. Preview and download.
Image to ASCII Art
Convert images to ASCII art locally. Adjustable width and invert.
URL Parser
Parse URL components including protocol, host, path, and query params.
Timestamp Converter
Convert Unix timestamps and datetime. Supports seconds/milliseconds.
Base Converter
Convert between binary, octal, decimal, hex, and bases 2-36.
User-Agent Tool
View and parse browser User-Agent. Detect browser, OS, and device info.
Chinese Converter
Convert Simplified and Traditional Chinese locally with OpenCC.
Pinyin Converter
Convert Chinese to pinyin with tone marks, numbers, or plain style.
Text to Speech
Read text aloud using Web Speech API. Choose voice, rate, and pitch.
Image Upscaler
Upscale image size locally with 2×/3×/4× scale and interpolation options.
PDF Sign
Add drawn or image signatures to PDFs locally. Choose pages and position.
Food Calorie Table
Browse calories and nutrients per 100g. Filter by category or search.