TASK

Encode binary data into a JSON-safe string

Convert raw bytes (images, encrypted blobs, file contents) into a Base64 string that can be embedded inside a JSON field without breaking the structure.

1

JSON cannot carry raw bytes — all string values must be valid Unicode. Base64 encodes arbitrary bytes into ASCII letters, digits, and +/ which are all JSON-safe, making it the standard way to embed binary payloads.
2

Base64 Encoder →
Paste or upload the binary data. The tool outputs a Base64 string with no line breaks, ready to paste as a JSON string value.
3

json-format → base64-encode → url-encode
View recipe Open in Toolchain

When the JSON containing the Base64 field must itself go into a URL, use this chain: it Base64-encodes the binary, wraps it in JSON, and percent-encodes the result.
4

JSON Formatter →
Wrap the Base64 string in a JSON object like {"data":"<base64>","type":"image/png"} and format it to verify the structure is valid.

Frequently asked questions

Why not use hex instead of Base64 for JSON?: Hex works but doubles the size (2 chars per byte vs Base64's 1.33). For large binaries the size difference matters; Base64 is the conventional choice for JSON-embedded binary.
How do I include the MIME type?: Store it as a sibling field (e.g. "mimeType":"image/png") or build a data URI (data:image/png;base64,<...>). The data URI form lets browsers render it directly in an <img> tag.

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.

Blowfish Encrypt then Base64

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

Compare two YAML configs via JSON

Convert YAML configs to JSON for diff-friendly comparison of structured values.

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.

HJSON to JSON Format

Format HJSON then convert to standard JSON.

HMAC Sign then Base64 Encode

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

Format JSON and compute integrity checksum

Pretty-print a JSON document and compute a CRC32 checksum to detect any subsequent modifications.

Minify and validate JSON

Format JSON for inspection and validate it is syntactically correct in one pass.

Format JSON and generate TypeScript interface

Format a JSON document then infer a TypeScript interface definition in one chain.

Validate, format, then convert JSON to YAML

Convert a (possibly minified) JSON config to YAML, catching syntax errors at the first node instead of producing subtly wrong YAML.

JSON5 to JSON Format

Format JSON5 then convert to standard JSON.

JSONC to JSON Format

Format JSONC (JSON with comments) then convert to standard JSON.

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.

Parse Query String and Format JSON

Parse query string into key-value pairs then format as JSON.

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.

Kebab Case and URL Encode

Convert to kebab-case then URL-encode for safe URL slugs.

Shuffle Text and Base64 Encode

Shuffle text characters then Base64-encode the result.

Convert TOML to JSON

Parse a TOML configuration file into JSON for tools and APIs that expect JSON input.

Convert TOML to YAML via JSON

Transform a TOML configuration file into YAML format, using JSON as an intermediate representation.

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.

Encode a text payload for URL transport

Percent-encode text then show its hex representation for safe URL parameter transport.

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.

Generate TypeScript interfaces from YAML

Convert a YAML document to TypeScript interface definitions, using JSON as an intermediate format.

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.

Format, minify, or sort JSON online. Free, private, and 100% client-side.

Base64 Image Preview

Preview Base64 image and show metadata. Free, private, 100% client-side.