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.