Base64 encode and decode API. One call, either direction.
Pass any string to encode it to Base64, or a Base64 string to decode it back to plain text. Standard and URL-safe (base64url) variants supported.
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What the Base64 Encode/Decode API Does
One endpoint for either direction. Standard Base64 (RFC 4648) or URL-safe base64url, your choice.
Structured output
Every response returns the encoded or decoded string under a single result field — no need to parse binary payloads or manage encoding logic client-side.
{
"result": "SGVsbG8sIHdvcmxkIQ=="
}
Simple to integrate
One required field: value. Add variant to switch to URL-safe encoding. A single POST request handles both encode and decode.
POST /v1/technology/base64/encode
Host: requiems.xyz
requiems-api-key: YOUR_API_KEY
Content-Type: application/json
{ "value": "Hello, world!" }
Encode and Decode Base64 in Any Workflow
From API payloads to auth headers — anywhere Base64 shows up, this API handles the conversion.
Encode binary data for JSON transport
Convert binary payloads to Base64 strings so they can travel safely inside JSON request and response bodies.
Decode third-party webhook payloads
Decode Base64-encoded fields from incoming webhooks — attachments, signatures, or binary blobs — without writing custom decoding logic.
Generate URL-safe tokens
Use the url variant to encode tokens and identifiers that need to appear directly in a URL or filename without percent-encoding.
Build Basic Auth headers
Encode username:password credentials to Base64 for constructing Authorization: Basic headers in test tools or integrations.
Power data inspection utilities
Add encode/decode capability to internal tools, debuggers, or API playgrounds without shipping a client-side Base64 library.
Add Base64 utilities to your platform
Offer encode/decode as a built-in developer utility inside your product via a single authenticated API call.
Use together with complementary APIs.
Base64 Encode/Decode works even better when paired with other Requiems APIs.
Benefit: Decode or re-encode barcode image payloads returned by the Barcode Generator API.
Outcome: Move barcode images between formats and storage layers using one consistent encoding workflow.
Benefit: Handle QR code image payloads with the same encode/decode logic used elsewhere in your pipeline.
Outcome: Standardize how your platform handles all base64-encoded image data, from QR codes to file uploads.
Benefit: Decode Base64-encoded Markdown payloads before converting them to HTML.
Outcome: Support content pipelines where Markdown source arrives Base64-encoded from upstream systems.
Frequently Asked Questions
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Add Base64 encode/decode to your product with Requiems.
One API key. Base64 encode/decode, plus 50+ other developer APIs.