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Convert, merge, split, and edit PDFs
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Everything you need in one place. PDF converters, image editors, calculators, and 50+ more tools. Fast, secure, and completely free. No installation required—just open and use.
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Finance
Investment, returns, and financial calculators
Converters
Convert units, currency, and more
Calculators
Health, math, and everyday calculators
Text Tools
Word counter, case converter, and more
Image Tools
Resize, compress, and convert images
Developer Tools
JSON formatter, base64, and more
How OnToolBox Works
Simple, fast, and secure - get started in seconds
1
Choose Your Tool
Select from 50+ professional online tools including PDF converters, image editors, calculators, and developer utilities. All tools are completely free to use.
2
Upload & Process
Upload your files and let our tools work their magic. All processing happens instantly in your browser for maximum privacy and speed. Convert PDF to Word, compress images, or merge PDFs in seconds.
3
Download & Save
Download your processed files immediately. Sign in to automatically save all your work to the cloud and access it from any device, anytime.
Most Popular Tools
Our most-used tools for everyday tasks
PDF to Word
Convert PDF to Word documents instantly while preserving formatting and layout.
Merge PDF
Combine multiple PDF files into one document with our free PDF merger tool.
Compress Image
Reduce image file size without losing quality. Perfect for web optimization.
Password Generator
Create strong, secure passwords with our advanced password generator tool.
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File Size Limits
Images
Up to 10MB per file
PDFs
Up to 25MB per file
Documents
Up to 15MB per file
Why Choose OnToolBox?
Professional tools with enterprise-grade features
Privacy First
All processing happens in your browser. Files are only saved to the cloud when you choose to sign in.
Lightning Fast
Instant client-side processing with no waiting. Sign in to save your files for later access.
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Access all essential tools at no cost. No credit card required to get started.
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