Base32 is a binary-to-text encoding scheme that represents binary data using 32 printable ASCII characters (A–Z and 2–7 in the standard RFC 4648 variant). It is more human-readable than Base64 and case-insensitive, making it popular for encoding tokens, keys, and identifiers.

What is the difference between Base32 and Base64?

Base32 uses a 32-character alphabet (letters and digits only, no symbols), making it safe for use in URLs, file names, and case-insensitive contexts. Base64 uses 64 characters including + and / which can cause issues in URLs. Base32 output is about 60% larger than Base64 for the same input.

What Base32 variants does this tool support?

The tool supports four variants: Base32 (RFC 3548/4648) — the standard with A–Z and 2–7; Base32 Hex (RFC 4648) — uses 0–9 and A–V for sorting-compatible output; z-base-32 — a human-oriented alphabet designed to be easier to transcribe; and Crockford's Base32 — designed for human readability, excluding visually similar characters like I, L, and O.

Does this tool send my data to a server?

No. All encoding and decoding is performed entirely in your browser using JavaScript. Your data never leaves your device.

Why does Base32 output end with = signs?

The = characters are padding. Base32 encodes data in 5-bit groups, and if the input is not a multiple of 5 bytes, padding characters are added to make the output length a multiple of 8. Padding can be disabled in some variants like z-base-32.

Workspace

View

Algorithm

Variant

→ 0 chars

View

Output will appear here…

Base32 (RFC 3548, RFC 4648) Alphabet

ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=

Letters to Numbers

Trusted Conversion Tools

Base32 Converter

Our free Base32 Converter lets you encode and decode Base32 instantly — supporting all major variants including RFC 4648, Base32 Hex, z-base-32, and Crockford's Base32, entirely in your browser with no uploads required.

Who Is It For?

Developers & Engineers

Encoding API tokens, secret keys, and binary data in Base32 for use in URLs, QR codes, and case-insensitive systems.

Security & Cryptography Students

Understanding binary-to-text encoding schemes and the differences between Base32 variants as part of cryptography coursework.

DevOps & SRE Teams

Decoding Base32-encoded configuration values, TOTP secrets, and OTP tokens when troubleshooting authentication systems.

Data Engineers

Working with Base32-encoded identifiers in data pipelines, distributed systems, and storage keys.

CTF & Puzzle Solvers

Decoding Base32-encoded clues in capture-the-flag competitions and online puzzle challenges.

How It Works

Select Encode or Decode in the middle panel, then choose your Base32 variant from the dropdown. Type or paste your input in the left panel — the tool processes it instantly using a pure JavaScript implementation with no server calls. For encoding, every 5 bytes of input are grouped into 8 Base32 characters; padding (=) is added if needed. For decoding, Base32 characters are mapped back to their 5-bit values, reassembled into bytes, and decoded as UTF-8 text. The alphabet reference at the bottom shows exactly which characters the selected variant uses.

Features

Encode text to Base32 or decode Base32 back to text
Four variants: RFC 4648, Base32 Hex, z-base-32, Crockford's Base32
Three-panel layout: input, operation settings, output — matching industry-standard encoder UIs
Live character count showing encoded/decoded length
Alphabet reference panel showing the full character set for each variant
One-click copy to clipboard
100% browser-based — no data ever leaves your device

Other Tools

Explore more tools by clicking the + button above

Letters to Numbers Converter

Convert letters to numbers using A1Z26 cipher

A1Z26 Translator

Translate letters to numbers with the A1Z26 alphabet

A1Z26 Decoder and Encoder

Encode letters to A1Z26 numbers and decode numbers back to letters instantly

A0Z25 Cipher Translator

Convert text using A0Z25 cipher encoding

A0Z25 Decoder

Decode A0Z25 encoded numbers back to letters instantly

Your Privacy Matters

All processing happens in your browser. We never store, send, or log your data. Completely private and secure.