Base64 Encoder/Decoder
Encode plain text into Base64 or decode Base64 back into readable UTF-8 text. The tool supports Unicode, emojis, Urdu, Arabic and multiline content. Use it for developer workflows, API debugging and data-format testing.
Base64 Encoder and Decoder
Convert text to Base64 or decode Base64 back to readable UTF-8 text.
Your text is converted locally in your browser and is never uploaded to our servers. Base64 is an encoding, not encryption, so do not use it to protect passwords or secrets. No account is required.
How to use Base64 Encoder/Decoder
Choose a mode
Select Encode to convert text to Base64, or Decode to convert Base64 back to text.
Paste your input
Enter plain text to encode, or paste Base64 to decode. Multiline input is supported.
Run the conversion
The result appears instantly, computed in your browser.
Copy or download
Copy the output to your clipboard or download it as a UTF-8 .txt file.
Key Features
- UTF-8 and Unicode support: Correctly handles emojis, Urdu, Arabic, accented characters, and multiline text.
- Encode and decode modes: Switch between converting text to Base64 and back with one control.
- Base64 validation: Malformed Base64 shows a clear inline error instead of corrupted output.
- Character and byte counts: See both character and UTF-8 byte counts for input and output.
- Browser-based privacy: All conversion happens locally in your browser; nothing is uploaded.
- Copy and download: Copy the result or download it as a UTF-8 text file. No signup required.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a way to represent binary or text data using a limited set of ASCII characters, so it can travel safely through systems that expect text. It is reversible and adds no secrecy.
Is Base64 encryption?
No. Base64 is an encoding, not encryption. It uses no key and provides no confidentiality, so it must never be used to protect passwords or secrets.
Can Base64 be decoded without a password?
Yes. Base64 needs no key or password. Anyone can decode a Base64 string back to its original content.
Does this tool support Unicode and emojis?
Yes. Text is converted using UTF-8, so Unicode, emojis, Urdu, Arabic, and accented characters encode and decode correctly.
Why does Base64 output become longer?
Base64 represents every three bytes with four characters, so the encoded output is usually larger than the original, roughly by a third. It does not compress data.
What causes an invalid Base64 error?
Common causes are characters that are not valid Base64, an impossible length, or misplaced padding. Base64URL input using - or _ is also reported, since this tool decodes standard Base64.
Is my text uploaded or stored?
No. The conversion runs entirely in your browser, so your text is never uploaded to or stored on our servers.
What is the difference between Base64 and Base64URL?
Base64URL is a URL-safe variant where + becomes - and / becomes _, and padding may be omitted. This tool works with standard Base64 and will flag Base64URL input rather than silently reinterpreting it.