Input is rejected
remove surrounding quotes, confirm the Standard/URL-safe setting, check padding and verify that the value was not truncated.
Convert Base64 to JSON
Decode Base64 to JSON, review the restored output and copy or download it. Use the standard or URL-safe option required by the source.
Base64 utility · Fast, exact Base64 conversion
What this tool does
Paste the Base64 value and decode it to JSON. The tool returns the corresponding byte or text representation; it does not automatically validate, reformat or execute the result.
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Paste text or choose a file
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Encode, decode or inspect
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Review output and byte details
1. Input
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2. Action
3. Output
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4. Quick actions
5. Base64 information
DescriptionBase64 represents bytes as text; it is not encryption.
AlphabetA-Z, a-z, 0-9, +, /, =
Input size0 characters / 0 bytes
Output size0 characters / 0 bytes
PaddingUses = to complete a four-character group.
StatusReady
How it works
Input bytes
101010 111100 110101 ...
Split into 6-bit groups
101010 111100 110101 ...
Convert to indexes
42 60 53 ...
Base64 characters
q 8 1 ...
How to convert Base64 to JSON
Paste the Base64 string you want to decode.
Keep Decode selected and choose Standard or URL-safe Base64 when the control is available.
Review the output and byte information, then copy or download the result.
Output and format behavior
The output is decoded text, not a parsed JSON object. Formatting, schema validation and JWT signature checks are outside this page.
Use Standard Base64 for the normal RFC 4648 alphabet. Use URL-safe only when the receiving system expects Base64URL; padding rules can differ by protocol.
Expert tip
Validate the decoded document with a format-specific tool after conversion; successful Base64 decoding proves only that the byte representation was recoverable.
When this is useful
Typical workflows include:
- Recover a human-readable configuration value before reviewing, formatting or validating it elsewhere.
- Return encoded source to readable text for audit, code review or troubleshooting.
- Inspect or compare a small payload when the original representation is opaque or difficult to paste safely.
Limitations and safety
Important constraints:
- Base64 normally adds about one third to the byte payload, before any data-URL prefix or surrounding markup.
- Base64 is reversible encoding, not encryption. Anyone who receives the string can decode the original bytes.
- The converter works with the supplied text or bytes; it does not parse, validate, minify, pretty-print or repair the document.
Troubleshooting
Decoded text is unreadable
the bytes may not be UTF-8 or may be binary. Inspect the same payload with the hex or binary page.
Frequently asked questions
What exactly is preserved?
The output is decoded text, not a parsed JSON object. Formatting, schema validation and JWT signature checks are outside this page.
Does this page validate the source format?
No. It converts the supplied text or bytes. Use a dedicated parser, formatter or validator when syntax correctness matters.
What is the difference between standard Base64 and Base64URL?
Standard Base64 uses + and /. Base64URL uses - and _ and may omit padding; choose the form required by the receiving system.
Why is my Base64 input rejected?
Check for unsupported characters, a Standard/Base64URL mismatch, damaged padding or a truncated value. Also remove surrounding quotes that are not part of the payload.
Related Base64 tools
Continue with the localized page that matches the next operation:
Paste your input above, run the conversion, and copy or download the result.