Base64 Encoder/Decoder
Encode or decode text using Base64.
What Is This Tool?
Our Base64 encoder and decoder converts text to Base64 encoding and back instantly. Base64 is commonly used to safely transmit binary data as text in emails, URLs, and APIs. Full UTF-8 support means it handles all languages and special characters correctly. All encoding and decoding happens locally in your browser.
How to Use
- Select either Encode or Decode mode.
- Paste or type your text into the input field.
- The result appears instantly in the output field.
- Click Copy to copy the encoded or decoded result.
Common Use Cases
- Encoding images or files to Base64 for embedding in HTML or CSS
- Decoding Base64 strings from API responses for debugging
- Encoding credentials for HTTP Basic Authentication headers
- Safely encoding special characters for data transmission
Tips & Tricks
- Base64 is an encoding, not encryption — do not use it to hide sensitive data.
- Encoded Base64 is about 33% larger than the original text.
- If decoding produces garbled text, check that the input is valid Base64 without extra spaces or newlines.
Frequently Asked Questions
Is Base64 encoding the same as encryption?
No. Base64 is a reversible encoding scheme with no secret key — anyone can decode it instantly. Never use it to protect sensitive information; use real encryption for that.
Why does my decoded text come out garbled?
This usually means the input isn't valid Base64 — check for missing padding characters (=), stray line breaks, or characters outside the standard Base64 alphabet (A–Z, a–z, 0–9, +, /).
Does this tool support Unicode text like emoji or non-Latin characters?
Yes. It encodes and decodes using full UTF-8 support, so text in any language, along with emoji, converts correctly in both directions.
Why is the encoded output longer than my original text?
Base64 represents binary data using only 64 printable characters, which requires roughly 4 characters for every 3 bytes of input — about a 33% size increase.
Is my text uploaded when I encode or decode it?
No. All encoding and decoding happens locally in your browser using standard JavaScript functions — nothing is sent to a server.
Encode or decode text using Base64 encoding online. Convert strings to Base64 and vice versa with full UTF-8 support for developers and web professionals.
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