1 Text or a file 2 processed on your device 3 Base32, 58, 85 and more
Base32, Base58 & Ascii85 Encoder
Input
Output
Result
ULID
Part
Value
The same bytes in every encoding
Encoding
Value
Length
01
What it does
Encodes and decodes Base32 (RFC 4648 and Crockford), Base58 with Base58Check, Ascii85, Z85, Base64url and Base36, and reads ULIDs.
Base32 and Base32hex (RFC 4648) and Crockford Base32
Base58 (Bitcoin and Flickr) with Base58Check checksums
Ascii85 and ZeroMQ Z85
Base64, Base64url and Base36
02
Private by design
Everything happens in your browser. Nothing you type, paste or upload is sent anywhere, and it keeps working offline once the page has loaded.
03
What you get
Encoded or decoded text and hex, with a Copy and a Download button on every result.
Base32
Base58
Ascii85
ULID
Why it matters
Base64 isn't the only way to turn bytes into text. TOTP secrets use Base32, Bitcoin addresses and IPFS hashes use Base58, PDF and PostScript use Ascii85, ZeroMQ uses Z85, and ULIDs use Crockford Base32. Each exists for a reason, such as avoiding characters that look alike or fitting in URLs.
This tool encodes and decodes all of them from text, hex or a file, checks Base58Check checksums so you can spot a mistyped address, and shows the same bytes in every encoding side by side to compare their lengths.
How it works
InputText, hex or a file
In your browserEncoded or decoded with 10 codecs
OutputThe encoded text, and ULID tools
Where it fits in a designer's workflow
Plan
Design
Build
Test
Launch
Working with keys, IDs and addresses.
By the numbers
Encoded by this tool. Base64 adds a third; Base32 adds 60% but survives case changes and avoids confusing letters; Base58 drops 0, O, I and l so people can copy it by hand. Ascii85 includes its <~ ~> delimiters here. Source: RFC 4648.Show the numbers as a table
Encoding
Characters
Base32 (RFC 4648)
24
Base32hex (RFC 4648 §7)
24
Crockford Base32
20
Base58 (Bitcoin, IPFS)
17
Base58 (Flickr)
17
Ascii85 (Adobe)
19
Z85 (ZeroMQ)
15
Base64
16
Base64url (no padding)
16
Base36 (big number)
19
How to use it
Choose encode or decode and the encoding.
Type or paste text, hex or an encoded value, or pick a file.
Read the result and its size.
Press 'Use output as input' to check it round-trips.
FAQ
Why does Base58 leave out some characters?
0, O, I and l are left out so people can't confuse them when reading or typing an address.
What's Base58Check?
Base58 with a 4-byte checksum from a double SHA-256, so a typo is detected instead of sending money to the wrong address.
What's a ULID?
A 128-bit ID like a UUID that sorts by creation time. The first 10 characters are the time in milliseconds.
I build fast, accessible websites and web apps that pass these checks from day one. Tell me about your project and I'll reply personally with honest next steps.
