HEX ⇄ DECIMAL CONVERTER
Convert between hexadecimal and decimal instantly
Everything runs locally in your browser. Your data never leaves your device - no uploads, no servers, no data transmission.
All processing happens directly on your machine using JavaScript. Close the tab and all input data is gone.
HEX Reference table
Common hexadecimal values with decimal equivalents and bit information. HEX is base-16, using digits 0-9 and letters A-F.
Conversion analytics
How to use HEX decimal converter
Convert between hexadecimal and decimal in 3 simple steps
Full Documentation DocsEnter value
Type values separated by commas, spaces, or new lines
Pick mode
Choose HEX to DEC or DEC to HEX conversion mode
Copy result
One-click copy or download to use anywhere
Why use this hex converter?
Batch conversion, file upload, export to TXT/CSV/JSON
Bidirectional conversion
Convert both ways: HEX to Decimal and Decimal to HEX. Swap direction instantly with one click to verify results.
Uppercase & prefix options
Control HEX output format: toggle uppercase/lowercase (FF vs ff) and add 0x prefix. Perfect for programming workflows.
Swap functionality
Instantly reverse input/output and switch conversion direction. Convert HEX to DEC result back to HEX with one click.
Multi-value support
Convert multiple values at once. Separate with commas, spaces, or new lines for batch conversion.
Export options
Download your conversions as TXT, CSV, or JSON files for documentation and processing.
Error tracking
Real-time error detection with accuracy score. See exactly which values failed conversion and why.
Frequently Asked Questions
Everything you need to know about HEX and decimal conversion
What is hexadecimal (HEX)?
Hexadecimal is a base-16 number system using digits 0-9 and letters A-F. It's commonly used in programming, web development, and digital systems to represent binary data in a more compact and readable format.
How do I convert HEX to decimal?
Simply enter your HEX value (like FF, 0xFF, or DEADBEEF) in the input field. The tool instantly converts it to decimal. You can enter multiple values separated by commas, spaces, or place each value on a new line for batch conversion.
Does it support batch conversion?
Yes! Enter multiple values separated by commas, spaces, or new lines. The tool will convert all values simultaneously, making it perfect for bulk conversions.
What's the difference between uppercase and lowercase HEX?
There's no functional difference - both FF and ff equal 255. It's purely a formatting preference. Use the "Uppercase HEX" checkbox to choose your preferred output style.
Can I export my conversion history?
Absolutely! Export your conversion history as TXT, CSV, or JSON files. Perfect for documentation, record-keeping, or further data processing.
What's the maximum value I can convert?
The tool supports JavaScript's safe integer range: up to 2^53-1 (9,007,199,254,740,991) for accurate conversions without losing precision.
Is my data secure and private?
Yes! All conversions happen locally in your browser. No data is sent to any server. All conversions happen locally in your browser.
Technical Details
How this hex to decimal converter processes number systems
Multi-Base Conversion Engine
This hex to decimal converter online tool supports bidirectional conversion between hexadecimal (base-16) and decimal (base-10) number systems. Uses JavaScript's native parseInt() and toString() methods with accurate results up to JavaScript's safe integer limit (2^53-1, or 9,007,199,254,740,991).
Zero-Upload Privacy
All number conversions run entirely in your browser using client-side JavaScript. No data is transmitted to any server. No API calls, no logging, no third-party processing. Your input stays in volatile memory and is erased when you close the tab.
Format Support
Accepts hex input with or without 0x prefix, case-insensitive (A-F or a-f). Supports batch conversion of multiple values separated by commas, spaces, semicolons, or newlines. Output includes configurable HEX formatting with uppercase/lowercase toggle and optional 0x prefix.
Performance
Real-time conversion as you type with auto-update toggle. Accurate conversion up to 2^53-1 using native JavaScript parseInt() and toString() methods. No external libraries required - runs on native browser APIs.
Export & History
Download conversion results in TXT, CSV, or JSON format. Persistent conversion history tracks all past conversions with timestamps. One-click copy for individual results. File upload support for TXT and CSV batch input.
Batch Processing
Convert multiple hex or decimal values in a single operation. Supports comma, space, semicolon, and newline separators. Real-time error detection with accuracy scoring per batch. Swap button instantly reverses conversion direction and exchanges input/output values.