About Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to plain text, right in your browser. Base64 safely represents binary or text data using only ASCII characters, commonly used in data URIs, email, and APIs.
How to Use
- Paste your text or Base64 string.
- Choose whether to encode or decode.
- Read the converted result instantly.
- Copy the output with one click.
Why Use This Tool?
- Accurate — built on precise, well-tested mathematical formulas.
- Instant — all calculations happen client-side for zero latency.
- Private — no data is sent to any server; your information stays on your device.
- Free — no sign-up, no limits, no hidden costs.
Frequently Asked Questions
What is Base64 encoding used for?
Base64 encodes binary data (like images or files) into ASCII text so it can travel safely through systems that only handle text — for example data: URIs in HTML/CSS, email attachments (MIME), and JSON payloads.
Does Base64 encryption keep my data secure?
No — Base64 is encoding, not encryption. It is easily reversible and provides no security. Never use it to protect passwords or sensitive data.
Why is my Base64 string longer than the original?
Base64 represents every 3 bytes as 4 ASCII characters, so the encoded output is about 33% larger than the original data.