TASK

Verify that encode-decode round-trips losslessly

Confirm that decoding then re-encoding (or vice versa) returns the exact original input, catching silent data corruption from wrong alphabets or padding.

1

A correct encoding is a bijection: decode(encode(x)) == x for all valid x. Testing the round-trip catches wrong alphabet choices, padding bugs, charset mismatches, and truncation — the most common silent data-loss bugs.
2

Base64 Encoder →
Start with your original text or hex. Encode it to Base64.
3

Base64 Decoder →
Decode the Base64 output back to bytes. Compare with the original — any difference means the encoding parameters (alphabet, padding) are inconsistent.
4

base64-encode → base64-decode
View recipe Open in Toolchain

Run the dedicated verify chain which automates the round-trip and reports pass/fail, so you do not have to eyeball the comparison.

Frequently asked questions

The round-trip passes for ASCII but fails for Unicode — why?: The encode step may be treating the input as Latin-1 bytes while decode interprets as UTF-8 (or vice versa). Ensure both steps use the same charset — typically UTF-8 for modern text.
Should I test encode-then-decode or decode-then-encode?: Test both directions. encode→decode verifies your encoder is correct; decode→encode verifies your decoder handles all valid inputs. Some decoders are lenient (accept malformed input) which only the second test catches.

Workflows that solve this

Convert Ascii85 to Base64

Decode Ascii85 and re-encode as Base64 for wider compatibility.

Convert Base2048 to Base64

Decode Base2048 (emoji) and re-encode as Base64 for standard transport.

Convert Base32 to Base64

Decode a Base32-encoded string into raw bytes and re-encode as Base64 for more compact representation.

Convert Base58 to Base64

Decode Base58 and re-encode as Base64 for standard compatibility.

Base64 encode then decode round-trip

Encode text to Base64 and decode it back to verify the round-trip preserves the original data.

Convert Base64 to Base85

Decode Base64 and re-encode as Base85 for compact representation.

Convert Base64 to Hex

Decode a Base64 string into raw bytes and re-encode it as hexadecimal for inspection or interop.

Blowfish Encrypt then Base64

Blowfish encrypt then Base64-encode for text-safe transport.

Decode a Basic Auth credential pair

Decode the Base64 portion of an HTTP Basic Authorization header into username:password.

DES Encrypt then Base64

DES encrypt then Base64-encode for legacy compatibility.

Encode a JSON payload for URL transport

Prepare a JSON document for a URL parameter: pretty-print, Base64-encode, then percent-encode — the exact inverse of the nested-parameter decode chain.

AES encrypt then Base64 encode

Encrypt plaintext with AES and encode the ciphertext as Base64 for text-safe transport.

Hash content and encode as Base64

Compute a hash of the input and encode the hash digest as Base64 for compact transport.

Convert Hex to Base64

Decode a hexadecimal string into raw bytes and re-encode it as Base64 for compact transport.

HMAC Sign then Base64 Encode

Generate HMAC signature then Base64-encode for API auth headers.

Morse Encode and Base64 Transport

Encode text as Morse code then Base64-encode for digital transport.

Decode and format a JWT payload

Parse a JWT token, extract its payload, and format the JSON for inspection.

RC4 Encrypt then Base64

RC4 encrypt then Base64-encode for transport.

RIPEMD-160 Hash then Base64

Compute RIPEMD-160 hash then Base64-encode for transport.

Shuffle Text and Base64 Encode

Shuffle text characters then Base64-encode the result.

Unicode Escape and Base64 Encode

Unicode-escape text then Base64-encode for ASCII-safe transport.

URL Encode then Base64 Double Encode

URL-encode then Base64-encode for double encoding in API payloads.

Decode nested URL parameter (Base64 JSON)

Unwrap a URL parameter that carries URL-encoded Base64 JSON into readable, formatted JSON.

UUencode then Base64

UUencode text then Base64-encode the result for double encoding.

Generate UUID and Base64 Encode

Generate a UUID then Base64-encode it for compact storage.

Learn more

Want to understand why?

Base64 vs Base32 vs Base58

Compare three popular base-encoding schemes and learn when to choose each one.

Base64: how it works and when to use it

The byte-to-character mechanics behind Base64, why padding exists, which alphabet variants you will meet, and the boundaries where Base64 is the wrong tool.

Base128 maps binary data onto 128 ASCII characters, carrying 7 bits of payload per byte for an expansion of about 8/7.

Base64 maps arbitrary binary data onto 64 printable ASCII characters (A-Z, a-z, 0-9, +, /) so that binary data can travel over text-only channels.

Related tools

Encode text or binary data to Base64 online. Free, private, and 100% client-side.

Decode Base64 data back to readable text online. Free, private, and 100% client-side.

Encode text to hexadecimal online. Free, private, and 100% client-side.

Decode hexadecimal back to readable text online. Free, private, and 100% client-side.