Unicode stays intact
Emoji, Chinese, Japanese, Korean, and accented text become UTF-8 bytes before encoding instead of being truncated to a Latin-1 character range.
Free online developer utility · no registration or login
Free Base64 Encoder & Decoder Online
Encode or decode UTF-8 and URL-safe Base64 text online. Paste a value, copy the result, or download it from your browser without registration or login.
- UTF-8 aware
- Standard or URL-safe output
- Clear invalid-input errors
- Free online, no registration or login
Base64 workspace
Encode or decode text
This free online tool converts UTF-8 text in your browser with no registration or login. Nothing is uploaded, and the decoder returns text rather than arbitrary binary files.
20 characters · 20 UTF-8 bytes
Result
Run the converter to see the result.
Your converted text will appear here.
Input: 20 charactersBase64 to UTF-8 text
Encode or decode Base64 in three steps
A short path from a pasted value to a result you can inspect before copying or downloading.
- Step 1
Choose a direction and format
Select Encode or Decode, then choose standard Base64 or the URL-safe alphabet.
- Step 2
Enter the value
Paste plain text or a Base64 string. UTF-8 text, including emoji and CJK characters, is supported.
- Step 3
Check and take the result
Run the conversion, review the status and byte/character counts, then copy or download the output.
UTF-8 text, bytes, and output size
Base64 works on bytes. The tool converts text through UTF-8 so the displayed result stays faithful to what you pasted.
Counts show what changed
The workspace reports input characters, input bytes, and output characters after a conversion so you can inspect the actual result.
Padding completes a group
Standard Base64 maps each three-byte group to four characters. An equals sign at the end fills the final incomplete group; it is not part of the secret data.
Standard Base64 and Base64url
Pick the alphabet required by the system that will receive the value instead of changing symbols by hand.
Standard Base64
RFC 4648 standard output uses + and / and keeps padding by default. It is the familiar form for text-oriented payloads.
URL-safe Base64
Base64url replaces + with - and / with _. Use it for URL or filename contexts where those standard symbols can be awkward.
Optional no-padding output
When URL-safe output is selected, you can omit trailing = characters for systems that know the decoded length or explicitly require unpadded Base64url.
Invalid input, padding, and limits
A useful decoder should explain why a value failed instead of silently producing replacement characters.
Whitespace is harmless
Spaces and line breaks are removed before decoding so copied values can be inspected without manual cleanup.
Malformed values are rejected
Invalid alphabet characters, misplaced padding, and impossible lengths produce an error and leave your input unchanged.
Text output has a boundary
This page decodes UTF-8 text, not arbitrary binary files. Very large values also depend on the memory available to the current browser tab.
What Base64 is—and is not
Base64 helps bytes fit into text-only channels, but it does not add confidentiality or trust.
Useful for transport
Developers use Base64 for API fields, JSON or configuration values, data-URI text, email-style payloads, and token segments.
Not encryption
There is no key and no access control. Anyone who receives a Base64 string can decode it, so sensitive values need real encryption and careful handling.
Not validation of meaning
A string can be valid Base64 and still contain the wrong text, an expired token, or an unsafe payload. Decode it, then apply your own application checks.
Privacy and limits
Use the result as a text conversion aid, then apply your own application, transport, and security checks.
- This is a text-focused tool: it decodes UTF-8 text and does not preview or reconstruct arbitrary binary files.
- Base64 is encoding, not encryption, access control, or proof of authenticity.
- Very large values are limited by the memory and processing capacity of the current browser tab.
Base64 Encoder & Decoder FAQ
Straight answers about this free online tool, UTF-8 text, padding, URL-safe output, browser processing, and the difference between encoding and encryption.
Is this Base64 encoder and decoder free to use?
Yes. This is a free online Base64 encoder and decoder. You can encode or decode text in your browser without registering, creating an account, or logging in.
What is Base64 encoding?
Base64 is a reversible binary-to-text encoding. It represents bytes with a 64-character alphabet so values can travel through text-oriented formats; it does not make the data secret.
How do I encode text to Base64?
Choose Encode, select the standard or URL-safe output alphabet, paste your plain text, and run the tool. The result panel shows the encoded string and its output length.
How do I decode a Base64 string?
Choose Decode, select the alphabet that matches the value, paste the Base64 string, and run it. Spaces and line breaks are ignored, while invalid characters and impossible padding produce an error.
Does this tool support emoji and Chinese text?
Yes. Encoding converts your text to UTF-8 bytes first, so emoji, Chinese, Japanese, Korean, and accented characters round-trip as text.
What is Base64url and when should I use it?
Base64url is the RFC 4648 URL- and filename-safe variant. It replaces + and / with - and _, and this tool can omit trailing padding when you choose the no-padding option.
Why does Base64 end with = or ==?
Standard Base64 pads the final group so the encoded length is a multiple of four. One or two equals signs indicate that the last input group had fewer than three bytes.
Is Base64 encryption?
No. Base64 has no key and is easy to reverse. Do not use it as encryption, access control, or proof that a value is trustworthy.
Can this page decode arbitrary files?
This page is a text-focused encoder and decoder. It returns UTF-8 text and does not preview or reconstruct arbitrary binary files.
Does the input leave my browser?
No. The conversion runs in this browser, and the page does not upload the pasted input or generated result to a server. No registration or login is required.
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