Hex-decimal converter

The HEX ⇄ Decimal Converter lets you instantly convert between hexadecimal (base-16) and decimal (base-10) number systems. It's a bidirectional tool essential for programming, web development, working with color codes, memory addresses, and understanding computer data at a low level.

The HEX ⇄ Decimal Converter has a clean two-panel layout with mode selector at the top. Here's what you'll see:

1

Conversion mode selector (top)

At the top, you'll find Conversion mode: a collapsible section with two mode buttons:
• HEX → DEC (# icon, Hexadecimal to decimal) - converts hex values to decimal
• DEC → HEX (calculator icon, Decimal to hexadecimal) - converts decimal to hex

Click a mode button to switch. The selected mode is highlighted with a colored border.

2

Input panel (left)

The left panel is where you enter your values:
• Header with keyboard icon and label (HEX Input or Decimal input depending on mode)
• Action buttons: Upload, Paste, Clear
• Drop zone: Drop files here or start typing
• Supported formats displayed as badges - TXT, CSV

3

CONVERT button (center)

The orange CONVERT button sits between the two panels. Click it to perform the conversion.

Note: If Auto-convert is enabled (default), conversion happens automatically.

4

Swap button

Below the CONVERT button, you'll see a swap icon (⇄). Click it to swap the contents of input and output panels and switch to the opposite conversion mode.

5

Output panel (right)

The right panel shows your converted result:
• Header with magic wand icon and label (Decimal output or HEX Output)
• Action buttons: Copy, Download
• Output area: displays Converted values will appear here... before conversion

6

Options row (bottom left)

Below the panels, you'll find checkboxes that change based on mode:

HEX → DEC mode:
• Auto-convert only

DEC → HEX mode:
• Auto-convert: converts automatically as you type
• Uppercase HEX: outputs A-F instead of a-f
• Include 0x prefix: adds "0x" before each hex value

7

Statistics (bottom right)

Four counters track your conversion in real-time:
• INPUTS: number of values entered
• OUTPUTS: number of values converted
• ERRORS: number of invalid values
• CONVERTED (orange) - successful conversions

8

Favorites (top right)

Click the heart icon in the top right corner to add HEX ⇄ Decimal Converter to your favorites for quick access from the homepage.

HEX ⇄ Decimal Converter interface overview

The converter offers two modes that work in opposite directions:
• HEX → DEC: converts hexadecimal values to decimal numbers
• DEC → HEX: converts decimal numbers to hexadecimal values

Each mode has its own specific options. The interface adapts based on which mode is selected, showing only relevant options.

HEX → DEC mode converts hexadecimal values to their decimal equivalents. This is useful when you encounter hex values in code, memory dumps, or color codes and need to understand the actual numbers.

1

Input - Hexadecimal values

Enter hexadecimal values in the input panel. You can enter:
• Plain hex - FF, 1A, DEADBEEF
• With 0x prefix - 0xFF, 0x1A
• With # prefix - #FF, #FF5733
• Multiple values - one per line or comma-separated

Letters can be uppercase or lowercase (FF = ff).

Input - Hexadecimal values

2

Output - Decimal numbers

The output shows decimal equivalents:
• FF → 255
• 1A → 26
• DEADBEEF → 3735928559
• dd → 221

HEX → DEC conversion

3

Available options

In HEX → DEC mode, only one option is available:
• Auto-convert (checked by default) - converts automatically as you type

Available options (HEX → DEC mode)

4

Example

Input - dd
Output - 221

The hex value DD (13×16 + 13 = 221) is converted to its decimal equivalent.

INPUT (HEX)     OUTPUT (DECIMAL)
FF              255
1A              26
10              16
CAFEBABE        3405691582
DEADBEEF        3735928559
FFFFFFFF        4294967295

DEC → HEX mode converts decimal numbers to hexadecimal format. Essential when you need to work with color codes, memory addresses, or binary data representations.

1

Input - Decimal numbers

Enter decimal numbers in the input panel:
• Single value - 255
• Multiple values - one per line or comma-separated
• Only digits 0-9 are valid

Input - Decimal numbers

2

Output - Hexadecimal values

The output shows hex equivalents:
• 255 → FF (or ff or 0xFF depending on options)
• 16777215 → FFFFFF (white color in RGB)

Output - Hexadecimal values

3

Available options

In DEC → HEX mode, three options are available:
• Auto-convert: converts automatically as you type
• Uppercase HEX (checked by default) - outputs FF instead of ff
• Include 0x prefix: adds 0x prefix: 255 → 0xFF

Available options (DEC → HEX mode)

4

Output formatting

Use the checkboxes to control output format:
• Uppercase ON, prefix OFF: FF
• Uppercase ON, prefix ON: 0xFF
• Uppercase OFF, prefix OFF: ff
• Uppercase OFF, prefix ON: 0xff

INPUT (DECIMAL)     OUTPUT (HEX)
255                 FF
16                  10
256                 100
65535               FFFF
16777215            FFFFFF
4294967295          FFFFFFFF

Converting values is simple. Follow these steps:

The input panel has three action buttons in the header (top right):

1

Upload button

Click the upload icon to open a file picker. Select a file from your computer. Supported formats:
• TXT: plain text files with values
• CSV: comma-separated values

2

Paste button

Click the clipboard icon to paste text from your clipboard into the input panel. Equivalent to pressing Ctrl+V (or ⌘+V on Mac).

3

Clear button

Click the trash icon (red) to clear all content from the input panel. This also clears the output and resets statistics.

Input panel actions

The output panel shows your converted result with these action buttons:

1

Copy button

Click the copy icon to copy all converted values to your clipboard. A notification confirms the copy. Values are copied with line breaks between them.

2

Download button

Click the download icon (blue) to open the Export modal. This gives you multiple options for saving and sharing your results.

Output panel actions

The checkboxes at the bottom control conversion behavior. Available options depend on the current mode:

1

Auto-convert

Available in - Both modes
Default - Checked (enabled)

When enabled, conversion happens automatically as you:
• Type in the input panel
• Paste content
• Upload a file
• Change options

When disabled, you must click the CONVERT button.

2

Uppercase HEX

Available in: DEC → HEX mode only
Default: Checked (enabled)

When enabled, hex output uses uppercase letters: FF, DEADBEEF
When disabled, hex output uses lowercase: ff, deadbeef

Most programming conventions prefer uppercase for hex values.

3

Include 0x prefix

Available in: DEC → HEX mode only
Default: Unchecked (disabled)

When enabled, each hex value gets the 0x prefix: 0xFF, 0x1A
When disabled, plain hex is output - FF, 1A

Use the prefix when pasting into programming code (C, JavaScript, Python).

Conversion options

Click the Download button in the output panel to open the Export modal. It offers multiple ways to save and share your converted values:

1

Export as file

Three file format options:
• TXT: plain text file, one value per line
• CSV: comma-separated values, compatible with Excel
• JSON: structured data format for programming

2

Copy to clipboard

Click COPY RESULTS to copy all converted values to your clipboard. Same as the Copy button, but accessible from the modal.

3

Share

Click COPY SHARE LINK to copy a shareable URL. The link encodes your input values and conversion mode, so others can see the same conversion.

Perfect for sharing with colleagues or saving for later.

4

Close modal

Click the X button in the top right corner to close the modal without exporting.

Export modal

When you enter invalid values, the converter shows clear error messages to help you fix the problem:

1

Error banner

Invalid values trigger a red error banner in the output panel with:
• Warning icon (triangle with exclamation)
• Conversion Error title
• Error description (e.g., "Invalid decimal value")
• X button to dismiss the error

Error banner

2

Common HEX → DEC errors

Invalid hex values include:
• Non-hex characters (G, H, Z, etc.)
• Special characters or spaces in the middle
• Empty input

3

Common DEC → HEX errors

Invalid decimal values include:
• Letters (A, B, C, etc.)
• Special characters
• Negative numbers (without special handling)
• Non-numeric input

4

Error counter

The ERRORS counter in the statistics section tracks how many invalid values were encountered. This helps when processing large batches - you can see at a glance if some values failed.

Four counters in the bottom right track your conversion in real-time:

1

INPUTS

Shows the number of values entered in the input panel. Each line or comma-separated value counts as one input.

2

OUTPUTS

Shows the number of converted values in the output panel. Should match INPUTS minus ERRORS for successful conversions.

3

ERRORS

Shows the number of invalid values that couldn't be converted. Check this when processing batches to ensure all values converted successfully.

4

CONVERTED (orange)

Shows the total successful conversions in the current session. The highlight makes it easy to spot.

This counter accumulates across multiple conversions until you clear or refresh.

Statistics

Below the converter, you'll find the HEX Reference table: a comprehensive guide to common hexadecimal values with their decimal equivalents and bit information.

1

8-bit and 16-bit values

The first table shows common values for 8-bit (1 byte) and 16-bit (2 byte) ranges:
• 0x00 = 0 (8-bit minimum)
• 0x0F = 15 (single hex digit max)
• 0x7F = 127 (signed 8-bit max)
• 0xFF = 255 (8-bit maximum / 1 byte)
• 0x100 = 256 (first 16-bit value)
• 0xFFFF = 65,535 (16-bit maximum)

2

32-bit and 64-bit values

The second table shows larger values:
• 0x10000 = 65,536 (first value over 16-bit)
• 0xFFFFFF = 16,777,215 (RGB color max)
• 0xCAFEBABE = 3,405,691,582 (Java class file magic number)
• 0xDEADBEEF = 3,735,928,559 (common debug marker)
• 0xFFFFFFFF = 4,294,967,295 (32-bit maximum)
• 0x100000000 = 4,294,967,296 (first 64-bit value)

3

HEX digit table

The third table shows all 16 hex digits with their decimal and binary equivalents:
• 0 = 0 = 0000
• 1 = 1 = 0001
• 8 = 8 = 1000
• 9 = 9 = 1001
• A = 10 = 1010
• F = 15 = 1111

Each hex digit represents exactly 4 binary bits.

4

Using the reference

Use this table to:
• Quickly look up common values without converting
• Understand bit boundaries (8-bit, 16-bit, 32-bit)
• Learn the relationship between hex, decimal, and binary
• Recognize famous hex values like CAFEBABE and DEADBEEF

HEX reference table

Before diving in, let's understand the two number systems you're converting between. This knowledge helps you work more effectively with the tool.

Here's when you'll typically need hex-decimal conversion: