Base64 Decoder
Decode Base64 text instantly in the browser.
About the Base64 Decoder
Decode Base64 text instantly in the browser.
Base64 Decoder converts Base64-encoded strings back to plain text or binary data. Paste a Base64 string from an API response, JWT payload, or data URL and see the decoded content instantly — all processing happens in your browser.
- Type
- Tool
- Method
- RFC 4648 Base64 encode/decode, handles UTF-8 correctly
- Runs in
- Your browser — no account, no install
- Price
- Free
- Privacy
- Inputs stay on your device unless the tool says otherwise
Frequently asked questions
Base64 strings contain only A-Z, a-z, 0-9, +, /, and = (padding). They often start with 'eyJ' (which decodes to '{"' — common in JWTs). If a string has unusual characters, it is likely not Base64.
The encoded data might be binary (an image, file, or compressed data) rather than text. Binary data cannot be displayed as readable text. Check if the original data was text before decoding.
No. Base64 is encoding (reversible transformation), not encryption (security). Anyone can decode Base64 — it provides zero security. Use actual encryption (AES, RSA) to protect sensitive data.
Base64 encodes 3 bytes into 4 characters. If the input is not a multiple of 3 bytes, = padding is added: one = for 2 leftover bytes, two == for 1 leftover byte. Many decoders handle missing padding gracefully.
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