All web tools
A collection of 100% private, client-side web tools and utilities built to run right in your browser.
Developer tools
JSON Viewer & Formatter
Explore, format, validate, and analyze JSON with an interactive tree, instant search, tables, and statistics.
JWT, Base64 & URL Decoder
Decode JWT header, payload and expiry, and encode or decode Base64 (UTF-8, URL-safe) and URL strings locally.
DeepSeek Peak Hours & Pricing
Track DeepSeek API peak vs. off-peak hours in your local timezone with interactive timeline, live countdowns, and token pricing.
Image tools
QR Code Reader
Read QR codes and barcodes from screenshots, photos or your camera in your browser: links, Wi-Fi, VietQR transfers, email, phone, SMS, locations, contacts, events and Bitcoin.
Image EXIF Viewer
View camera hardware, exposure settings, GPS location, and full EXIF metadata locally.
Image Format Converter
Convert and resize JPG, PNG, WebP, GIF, SVG, and iPhone HEIC images instantly inside your browser.
Image to PDF Converter
Combine and convert JPG, PNG, WebP, GIF, BMP, and iPhone HEIC images into a single PDF document.
Creative tools
QR Code Generator
Create styled QR codes for links, Wi-Fi, contacts, SMS, Zalo and WhatsApp chats, locations, events, Bitcoin, VietQR and batches; export PNG, SVG or PDF.
VietQR Generator
Create a VietQR code to receive bank transfers: pick your bank, enter account number, amount and note, download PNG, SVG or PDF.
WiFi QR Code Generator
Create a QR code that joins your Wi-Fi network: enter the network name, password and security, then print or download PNG, SVG or PDF.
vCard QR Code Generator
Create a contact QR code (vCard) with name, company, job title, phone, email and website for business cards; download PNG, SVG or PDF.
Barcode Generator
Create Code 128, Code 39, EAN-13, UPC-A, EAN-8 and ITF-14 barcodes with an automatic check digit and download them as SVG or PNG.
Everyday tools
Vietnamese Lunar Calendar Converter
Convert solar and Vietnamese lunar dates both ways and browse a month grid of lunar days, with Can Chi years and leap months, for Vietnam time.