64 Base64Toolkit
Language:

Base64 Decode

Paste Base64 below and get the decoded text instantly. Free, forgiving of broken padding, and 100% in your browser.

0 chars · 0 bytes

0 chars · 0 bytes

Options

Recent conversions

Nothing yet — your last 10 conversions will appear here (stored only in this browser).

    About Base64 decoding

    Base64 decoding reverses the encoding process: each group of 4 Base64 characters is converted back into the original 3 bytes. Because the mapping is fixed and public, any Base64 string can be decoded by anyone — it is an encoding for safe transport, not a form of protection.

    This decoder is deliberately forgiving, because real-world Base64 is messy. It automatically strips whitespace and line breaks (common in MIME email and PEM certificates), converts URL-safe Base64URL characters back to the standard alphabet (common in JWT tokens and OAuth state values), and repairs missing = padding (common when tokens are trimmed by shells or config parsers). If the input still cannot be decoded, you get a clear error message explaining what is wrong instead of silent failure.

    Common decoding tasks

    Frequently Asked Questions

    ›How do I decode a Base64 string?

    Paste the Base64 string into the Base64 box above — the decoded text appears instantly in the Plain Text box. Stray whitespace, line breaks, and missing = padding are handled automatically.

    ›Why do I get "Invalid Base64" errors?

    Usually the string is truncated (a valid Base64 length is never one more than a multiple of 4), contains characters outside the Base64 alphabet, or is actually Base64URL from a JWT. This tool auto-converts URL-safe characters (-, _) and fixes padding, so most "broken" strings decode fine here.

    ›How do I decode Base64 that contains binary data?

    If the decoded result looks like garbage text, it is probably a binary file (image, PDF, zip) rather than text. Use Base64 to File to download it, or Base64 to Image to preview images.

    ›How do I decode a Kubernetes secret value?

    Run kubectl get secret mysecret -o yaml, copy any value under data:, and paste it here. To decode all keys of the secret at once, paste the entire YAML into our Kubernetes Secret Decoder.

    ›Can Base64 be decoded without a key or password?

    Yes — always. Base64 is a public, reversible encoding with no secret involved. If you were expecting the content to be protected, it needs encryption (AES, GPG, etc.), not Base64.

    Related Tools

    Base64 Encode Text to Base64, live Base64URL Encode URL-safe RFC 4648 Image to Base64 Data URIs for HTML/CSS Base64 to Image Preview & download File to Base64 Any file, in-browser Base64 to File Rebuild & download files Base64 to Hex Inspect raw bytes Hex to Base64 Hex strings to Base64 Kubernetes Secret Decoder Decode secret YAML JWT Decoder Inspect token claims