Base64 Encoder & Decoder
Encode any text to Base64 or decode Base64 back to text. Runs entirely in your browser.
Base64 encoder and decoder converts text or files to and from Base64 — a format used for embedding binary data in JSON, emails, and data URIs. ConvertDa's free Base64 tool runs entirely in your browser; nothing uploads anywhere.
How to base64
- 1
Paste your text or Base64 string into the input box.
- 2
Pick Encode or Decode mode.
- 3
Copy the result or download it as a text file.
Frequently asked questions
What is Base64?▾
Base64 is a way to represent binary data as plain text using 64 characters (A-Z, a-z, 0-9, +, /). It's commonly used in emails, data URIs, and APIs.
Is my input sent anywhere?▾
No. All encoding and decoding happens in your browser — nothing is uploaded to any server.
Does it support Unicode / emoji?▾
Yes. The tool encodes UTF-8 byte sequences correctly, so non-Latin characters and emoji round-trip safely.
What is Base64 used for?▾
Base64 turns binary data into ASCII characters so it can be safely transmitted in text-only systems — JSON APIs, email attachments, or data URIs in HTML and CSS. It's not encryption; anyone can decode it.
Is Base64 the same as encryption?▾
No. Base64 is encoding, not encryption. The output is reversible without any key. Use it for data transport, not security.