Base62 Converter
Free online Base62 converter. Encode text to Base62 and decode Base62 back to text using the alphanumeric 0-9a-zA-Z alphabet. 100% client-side, no upload.
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What is Base62 Converter?
A Base62 Converter encodes text or binary data into a compact string of 62 alphanumeric characters (0-9, a-z, A-Z), and decodes Base62 back to the original bytes. Because it uses no symbols, the output is URL-safe and can be pasted into emails, URLs, and form fields without escaping. Base62 is the encoding behind short-URL identifiers (like bit.ly and YouTube video IDs), database primary-key obfuscation, and compact hash representations. This tool runs entirely in your browser using BigInt arithmetic, so it can handle long inputs and never uploads anything.
Key Benefits
- Instant two-way conversion: encode to Base62 and decode back
- Standard 0-9a-zA-Z alphabet used by most short-URL services
- BigInt-powered for arbitrary-length input with no truncation
- Shows decoded bytes as both UTF-8 text and raw hex
- 100% client-side - nothing leaves your device
Common Use Cases
- •Building or debugging short-URL identifiers and compact IDs
- •Obfuscating sequential database primary keys in public APIs
- •Encoding hashes or tokens into URL-safe alphanumeric strings
- •Learning how Base62 compares to Base64, Base58, and hex
How to Use the Base62 Converter
- Pick a mode: Choose Encode (text to Base62) or Decode (Base62 to text).
- Enter your value: Type the text to encode, or the Base62 string to decode. The tool converts and validates automatically as you type using the standard 0-9a-zA-Z alphabet.
- Review the output: In Encode mode you see the Base62 string. In Decode mode you see both the decoded UTF-8 text and the raw hex bytes.
- Copy the result: Click Copy next to the output to use it in your short URL, database ID, or code.
Key Features
- Two-way conversion: encode text to Base62 and decode Base62 back
- Standard 0-9a-zA-Z alphabet used by most short-URL services
- BigInt-powered, handles arbitrary-length input with no truncation
- Shows decoded bytes as both UTF-8 text and raw hex
- Real-time results as you type
- 100% client-side - nothing is uploaded
Frequently Asked Questions
What is Base62 encoding?
Base62 is a binary-to-text encoding that uses all 62 alphanumeric characters: the digits 0-9, lowercase letters a-z, and uppercase letters A-Z. Because it contains no symbols or punctuation, the output is URL-safe and can be pasted into emails, URLs, and form fields without escaping. Base62 is widely used for short-URL identifiers (like bit.ly or YouTube video IDs), database primary-key obfuscation, and compact hash representations.
What alphabet does this tool use, and is Base62 standardized?
This tool uses the standard 0-9a-zA-Z alphabet (digits first, then lowercase, then uppercase), which is the most common ordering for short-URL services. Unlike Base32 and Base64, there is no single RFC standard for Base62, so other services may use a different character order (for example a-zA-Z0-9). Always check the target system's alphabet if you need byte-exact compatibility.
How does Base62 compare to Base64, Base58, and hex?
Base62 uses 62 characters (no symbols) so it is URL-safe and slightly longer than Base64 (which uses 64 characters including + and /). Base62 produces shorter strings than Base58 (58 chars) and much shorter than hex (16 chars), making it ideal when you want the most compact alphanumeric representation. Base64 is ~33% larger than the original bytes, Base62 is similar but drops symbols, and hex is 100% larger.
Can Base62 encode any binary data, not just text?
Yes. Under the hood Base62 encodes raw bytes. This tool encodes your text as UTF-8 bytes before Base62-encoding, and when decoding it shows both the UTF-8 interpretation and the raw hex bytes, so binary data that is not valid UTF-8 is still visible as hex.