01 Convert Tool

Number Base Converter — Decimal, Binary, Hex

Convert numbers between decimal, binary, hexadecimal and octal bases. See all four formats simultaneously. Instant, free.

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Why Use Compressfy?

Powerful features, completely free — no strings attached.

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All 4 Bases

Decimal, Binary, Hex and Octal shown simultaneously.

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One-Click Convert

Select input base and see all formats instantly.

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Developer Essential

Used daily in programming, networking, electronics.

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Always Free

No account, unlimited conversions.

How It Works

Three simple steps — no software, no waiting.

Upload File

Click the tool above or drag & drop your file directly.

Choose Settings

Adjust quality, size or options as needed.

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Understanding Number Systems

Different number bases represent quantities using different sets of symbols and place values. While humans use base-10 (decimal) for everyday counting, computers use base-2 (binary) internally, and programmers frequently work with base-16 (hexadecimal) as a compact representation of binary values.

The Four Main Number Systems

Decimal (Base 10): Digits 0–9, the everyday system used by humans worldwide
Binary (Base 2): Digits 0 and 1, the native language of computers and digital circuits
Hexadecimal (Base 16): Digits 0–9 and A–F, widely used in programming for memory addresses, color codes (#FF0000), and binary data representation
Octal (Base 8): Digits 0–7, used in Unix file permissions (chmod 755) and some legacy systems

Why Programmers Need Base Conversion

Memory addresses are shown in hexadecimal (e.g., 0x7FFEF3). Error codes, bit flags, and network protocol values are expressed in binary or hex. Unicode codepoints are written in hex (U+0041 = 'A'). Color values in CSS use hex (#FF5733). IP addresses can be expressed in multiple bases. Network masks and CIDR notation involve binary operations. Understanding base conversion is fundamental to low-level programming, networking, and security work.

Frequently Asked Questions

Base-2 using only 0 and 1. All computers process data in binary.

Base-16 using 0-9 and A-F. Used in memory addresses and colors.

Base-8 using 0-7. Used in Unix file permissions (chmod 755).

Enter 255, click Decimal → All. Result shows 11111111 in binary.