Base64 Decoder
Decode Base64 back into readable text with proper UTF-8 handling — data URIs, API payloads and encoded config values become clear instantly. Private and free.
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Paste the Base64 string into the input box.
- 2The decoded text appears instantly — copy it with one click.
- 3If decoding fails, check for truncated or non-Base64 characters in the input.
Base64 Decoder
Paste Base64 and see the decoded text live. Decoding goes through the standard TextDecoder, so multibyte UTF-8 content — accents, emoji, CJK — comes out correctly instead of turning into mojibake.
It is forgiving in the useful ways: whitespace and line breaks in the input are ignored, and data URI prefixes such as data:image/png;base64, are stripped automatically before decoding.
Frequently asked questions
The output looks like garbage symbols — why?
The input is probably not UTF-8 text. Base64 can encode arbitrary bytes: images, PDFs, binary blobs. This tool decodes bytes as UTF-8 text, so binary data shows as replacement characters.
Can it decode URL-safe Base64?
Yes — it is aimed at JWT-style data, where - and _ replace + and /. Standard Base64 with or without padding works too.
Is decoding done on a server?
No. Everything runs in your browser; the string never leaves your device.
Related tools
Base64 Encoder
Encode text to Base64 instantly with full UTF-8 support — emojis, accents and CJK characters survive intact. Free, private, nothing ever leaves your browser.
All tools →
URL Decoder
Decode percent-encoded URLs back into readable text — %20, %2F and query-string values become clear instantly. Handles + as space, fully in your browser.
All tools →
JWT Decoder
Decode JWT tokens online: inspect the header and payload claims with human-readable exp and iat timestamps. Decoding only — nothing is verified or uploaded.
All tools →
Hash Generator
Compute SHA-1, SHA-256, SHA-384, SHA-512 or MD5 hashes of text or files, right in your browser. Fast checksums for integrity checks — nothing uploaded.
All tools →
Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/base64-decoder?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — base64-decoder" loading="lazy"></iframe>