Base64 Encode / Decode — auto-detect + content-type sniffing

Encode text to Base64 or decode Base64 back, with auto-detection and content-type sniffing on decode (PNG/JPEG/GIF/PDF/ZIP/JSON/text). Standard or URL-safe alphabet. Bulk-capable. $0.0004 per operation. Empty input is uncharged.

What you get

• Auto-detect: valid Base64 is decoded, everything else encoded.
• URL-safe option (-/_, no padding).
• Type sniffing on decode via magic bytes: image/png, image/jpeg, application/pdf, application/zip, application/json, text/plain…
• byteLength of the decoded/encoded payload.
• Bulk: up to 50 strings per run.

Input

{ "items": ["Hello, Apify!", "SGVsbG8="], "direction": "auto", "urlSafe": false }

Output (real run, 2026-08-07)

{
  "ok": true,
  "direction": "encode",
  "input": "Hello, Apify!",
  "output": "SGVsbG8sIEFwaWZ5IQ==",
  "detectedType": null,
  "byteLength": 13,
  "urlSafe": false
}

Decoding SGVsbG8= returns { "direction": "decode", "output": "Hello", "detectedType": "text/plain" }.

Pricing — $0.0004 per operation

Priced at the floor. The one comparable on the Apify Store (rixin/base64-encoder-decoder, 2026-08-07) lists its per-operation events unpriced (start fee only), so there is no per-operation competitor price to quote. This actor adds auto-detection and content-type sniffing.

Limits (honest ones)

• Up to 50 items per run.
• Binary decodes are returned as Base64 in the JSON (with detectedType); text/JSON decodes return the decoded string.
• Decoded text output is truncated at 100,000 characters in the record.

FAQ

• Encode and decode? Both — set direction, or let auto decide.
• Does it tell me what a blob is? Yes — detectedType sniffs common image/document/text types on decode.
• URL-safe Base64? Yes — set urlSafe: true.
• Bulk? Yes — up to 50 strings, one charge each.

Use from code or AI agents

curl -X POST "https://api.apify.com/v2/acts/EliAI~base64-tool/runs?token=YOUR_APIFY_TOKEN" \
  -H 'content-type: application/json' \
  -d '{"input":"Hello, Apify!"}'

Callable as an agent tool through the Apify MCP server (mcp.apify.com).

Related actors

• String Encoder & Decoder (EliAI/string-encoder-toolkit) — multi-format text codec: URL, HTML entities, hex, ROT13, and Unicode escapes (plus base64). Reach for it for non-base64 formats; reach for this actor when you need base64/data-URI decoding with binary content-type sniffing (PNG/JPEG/PDF/ZIP/JSON detection), which the text codec does not do.