Your browser is a complete toolbox Data never leaves the browser
100+ online tools, all running locally. Files never uploaded, free, no registration, cross-platform.
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Browse tools by scenario
PDF Tools
Merge, split, compress, and convert PDF files
Image Tools
Compress, convert, resize, remove background
Developer Tools
JSON formatting, Base64 encoding/decoding, regex testing
Text Tools
Word count, case conversion, text comparison
Conversion Tools
Length, weight, temperature, area unit conversions
Audio Tools
Format conversion, compression, editing, merging
Video Tools
Compression, format conversion, GIF creation
Security Tools
Password generation, hash calculation, encryption/decryption
Network Tools
QR code generation, barcode, URL and UA parsing
Daily Tools
Calculator, Pomodoro timer, random number generation
Popular tools
Most popular tools
Merge PDF
Merge multiple PDFs into a single file, with free order adjustment
Split PDF
Split PDF into multiple files by page number or range
Compress PDF
Compress PDF file size while maintaining clarity
Compress Image
Compress image size with almost no loss in quality
Convert Image Format
Convert between PNG, JPG, WebP, and other formats
Remove Background
One-click smart cutout to automatically remove image background
JSON Formatter
Format, validate, and compress JSON data
Base64 Encode/Decode
Encode and decode text or files with Base64
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Why choose qktools
Privacy and security
All processing happens locally in the browser; files never leave your device.
Fast and efficient
WASM accelerated, no upload wait, faster processing than traditional online tools.
Completely free
All tools free forever, no usage limits, no account required.
Multi-platform support
Supports desktop and mobile, can be installed as an app, works offline.