Decode a Base64 string
Base64 is common in API payloads, Basic Auth examples, data URLs, and JWT segments.
Input
SGVsbG8sIExvY2FsVG9vbHM=Output
Hello, LocalToolsDeveloper toolsRuns locally
Local Base64 Encode and Decode
Encode Unicode text to Base64 or decode Base64 back to readable text in your browser, without sending the input to a server.
base64encodedecodeunicode
Privacy note: this tool runs in your browser; inputs are not uploaded. How privacy works
Base64 text
Base64
Output will appear here.
Base64 Encode/Decode examples
Base64 Encode/Decode use cases
- Decode Base64 snippets from API payloads, logs, or copied headers.
- Encode small text values for tests, examples, or documentation.
- Inspect JWT header or payload segments before formatting the decoded JSON.
- Convert Unicode text with browser-safe handling.
How Base64 Encode/Decode works
- Input text is converted with browser APIs and Unicode-safe handling.
- Decode mode validates the Base64 input and returns readable text.
- Encode mode converts the current input into Base64.
- No Base64 input is uploaded by this browser-local tool.
Base64 Encode/Decode mistakes to avoid
- Base64 is encoding, not encryption.
- JWT uses Base64URL, which replaces some characters and may omit padding.
- Binary files and very large payloads may need a dedicated file workflow.
Base64 Encode/Decode privacy and processing
No uploadBrowser-localNo accountBase64 conversion runs locally in the browser. Text is encoded or decoded on your device.
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Base64 Encode/Decode FAQ
Is Base64 secure?
No. Base64 only encodes data into a text-safe representation. Anyone can decode it.
Is my Base64 text uploaded?
No. This Base64 tool runs locally in the browser.
What is the difference between Base64 and Base64URL?
Base64URL is a URL-safe variant often used in JWTs. It replaces characters such as plus and slash and may omit padding.