Developer Tools
Decode Base64 instantly to recover readable text from API data, tokens, headers, and test payloads.
Use this free Base64 Decoder to convert Base64-encoded text back into readable plain text instantly. It is useful when inspecting API payloads, debugging encoded headers, checking copied tokens, reading encoded JSON strings, and verifying transmitted text during development or testing. Paste a Base64 value to decode it quickly and confirm what the encoded data actually contains.
Use this free Base64 Decoder to convert Base64-encoded text back into readable plain text instantly. It is useful when inspecting API payloads, debugging encoded headers, checking copied tokens, reading encoded JSON strings, and verifying transmitted text during development or testing. Paste a Base64 value to decode it quickly and confirm what the encoded data actually contains.
Use base64 decoder when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
If this tool runs fully in the browser, your input stays on the client side instead of being uploaded to a server. That makes it useful for quick decoding of copied API values, headers, config strings, payload fragments, and test data when you want a fast local result.
Base64 Decoder turns encoded text back into readable text. Base64 Encoder does the reverse and creates Base64 from plain text. If your input already looks encoded, decode it first before trying anything else.
Base64 Decoder is for standard Base64 strings. JWT Decoder is better for JWT tokens because JWT parts use Base64 URL and have a specific token structure. If your value contains dot-separated token parts, the JWT tool is usually the right place to inspect it.
If you want to convert readable text back into Base64, use Base64 Encoder. If your value is URL-encoded rather than Base64, try URL Decoder. If the decoded result is JSON text, you may want to inspect it with JSON Validator or JSON Formatter.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
SGVsbG8=
Output
Hello
A standard Base64 value decodes back into plain text.
Input
aGVsbG8gd29ybGQ=
Output
hello world
Useful when checking encoded strings copied from scripts or tools.
Input
eyJuYW1lIjoiSm9obiIsInJvbGUiOiJhZG1pbiJ9
Output
{"name":"John","role":"admin"} Helpful when a system stores or transfers JSON as Base64 text.
Input
dXNlcjpwYXNzd29yZDEyMw==
Output
user:password123
Useful for understanding what was encoded before it was placed into a header or test value.
Input
aHR0cHM6Ly9leGFtcGxlLmNvbT9hPTEmYj0y
Output
https://example.com?a=1&b=2
Helpful when debugging encoded links or stored URL strings.
Input
bGluZSBvbmUKbGluZSB0d28=
Output
line one line two
Line breaks are preserved when the value is decoded.
Input
0J/RgNC40LLQtdGC
Output
Привет
Useful for verifying non-English or Unicode strings inside encoded payloads.
Input
SGVsbG8***
Output
Invalid Base64 input
Decoding fails when the pasted value contains invalid characters or broken formatting.
Fix: Check for invalid characters, broken padding, or copied text that is not actually Base64.
Fix: Use the Base64 URL decoder if the value uses URL-safe characters like - and _.
Fix: Copy the full encoded value, including any trailing padding characters if present.
Fix: Trim the input and remove accidental whitespace before decoding.
Fix: Some Base64 values represent binary or structured data, so the result may not be human-readable text.
A Base64 decoder converts Base64-encoded text back into its original plain text or readable string form.
Base64 Decoder turns encoded text back into readable text, while Base64 Encoder converts readable text into Base64.
The most common reasons are invalid characters, missing padding, truncated input, hidden whitespace, or using the wrong Base64 variant.
Yes. If a JSON string was encoded as Base64, this tool can decode it back into readable JSON text.
Yes. This is useful when checking encoded international text, symbols, or non-Latin strings.
Standard Base64 uses characters like + and /, while Base64 URL uses URL-safe replacements such as - and _. They are similar but not always interchangeable.
The encoded value may represent binary data, compressed data, or structured content instead of normal plain text.
Yes. That is one of the most practical uses for a Base64 decoder during development and debugging.
Not usually. JWT payloads use Base64 URL rather than standard Base64, so a JWT-specific tool is usually better.
Use the encoder when you want to confirm a round-trip conversion or recreate a valid Base64 value from readable text.