Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Base62 Encoder/Decoder
Encode hex to Base62 (0-9a-zA-Z) for URL-safe compact identifiers, or decode Base62 strings back to hex.
Enter hexadecimal bytes to encode to Base62.
Base62 Output
Raw Bytes
-
Base62 Length
-
Enter a Base62 string to decode back to hex.
Hex Output
Bytes Length
-
Base62 Length
-
- Choose a mode — Select Encode (hex → Base62) or Decode (Base62 → hex) using the tabs.
- Enter data — Type or paste hex (for encode) or Base62 (for decode) in the input field.
- View results — The converted output appears in real-time with byte length and character length information.
All conversion is performed 100% client-side in your browser. No data is sent to any server.
What Is Base62?
Base62 is a compact encoding scheme that uses 62 alphanumeric characters (0-9, a-z, A-Z) to represent large numbers in a URL-safe format. Unlike Base64, it does not include +, /, or = characters, making it ideal for use in URLs, short URLs, and compact identifiers without requiring escaping.
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
Base62 encoding is commonly used for URL shorteners (e.g., bit.ly/abc123), short unique IDs, invite codes, coupon codes, and any application requiring compact, human-friendly, URL-safe identifiers.
Base62 vs Other Encodings
| Encoding | Characters | URL-Safe | Use Case |
|---|---|---|---|
| Base16 (Hex) | 16 | Yes | Lowest density, readable |
| Base32 | 32 | Yes | Case-insensitive, readable |
| Base36 | 36 | Yes | Lowercase only, shorter |
| Base58 | 58 | Yes | Crypto addresses (no ambig) |
| Base62 | 62 | Yes | Compact and case-sensitive |
| Base64 | 64 + padding | No (needs escape) | Maximum density, data URIs |
What is Base62 used for?
Base62 is commonly used for URL shorteners, unique ID generation, coupon codes, invite codes, and anywhere you need a compact, URL-safe representation of binary data without special characters.
How does Base62 differ from Base64?
Base62 uses only alphanumeric characters (A-Z, a-z, 0-9) and has no padding, making it inherently URL-safe. Base64 uses +, /, and = characters which must be percent-encoded in URLs, reducing the benefit of the encoding.
Is Base62 more compact than Base64?
No. Base64 encodes 6 bits per character (64 = 2^6), while Base62 encodes approximately 5.95 bits per character (62 ≈ 2^5.95). Base64 produces slightly shorter output, but requires URL-encoding or additional handling for web use. Base62 is slightly longer but directly URL-safe.
Can I use Base62 for short IDs?
Yes. Base62 is excellent for generating short IDs from numeric values. For example, the number 1000000 encodes to 4c92 in Base62 — much shorter than decimal (1000000) or hex (f4240).
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