Base64 Encoder / Decoder
Encode any text to Base64 or decode Base64 strings back to plain text.
🔠 Encode / Decode Base64
Base64 Encoder & Decoder — Free Online Tool
Encode any text or data to Base64, or decode Base64 strings back to plain text — instantly, for free, with no server upload. Our Base64 Encoder & Decoder is used daily by developers for handling data in APIs, email encoding, embedding files in HTML/CSS, and much more. Base64 is an encoding scheme that converts binary...
Encode any text or data to Base64, or decode Base64 strings back to plain text — instantly, for free, with no server upload. Our Base64 Encoder & Decoder is used daily by developers for handling data in APIs, email encoding, embedding files in HTML/CSS, and much more.
Base64 is an encoding scheme that converts binary data into a sequence of printable ASCII characters. It's used extensively in web development, data transmission, email attachments (MIME), and authentication tokens. Understanding and working with Base64 is a core developer skill.
When to Use Base64
- Data URIs: Embed images directly in HTML/CSS as Base64 strings to reduce HTTP requests
- API authentication: Basic auth headers encode credentials as Base64
- Email attachments: MIME email encoding uses Base64 for binary attachments
- JWT tokens: JSON Web Tokens use Base64URL encoding for their payload
- Data storage: Store binary data in text-only systems like JSON or XML
How to Encode/Decode Base64 — Step by Step
- Choose mode: Select "Encode" to convert plain text to Base64, or "Decode" to convert Base64 back to text.
- Paste your input: Enter your text or Base64 string in the input box.
- Process: Click "Encode" or "Decode" — the result appears instantly.
- Copy: Click "Copy to Clipboard" to copy the encoded or decoded output.
- Clear and reuse: Click clear to start with new input.
❓ Frequently Asked Questions
No. Base64 is encoding, not encryption. It converts data to a different representation but provides no security. Never use Base64 alone to secure sensitive data.
Base64URL replaces '+' with '-' and '/' with '_' to make the encoded string safe to use in URLs and filenames.
If the Base64 string was encoding binary data (like an image), the decoded output will appear as garbled characters since it's binary, not text.
For text files, paste the content. For binary files, browser-based tools can also encode image files — check the image embedding feature.
Yes, 100% free with no account required.
Yes — all encoding/decoding happens in your browser. No data is sent to any server.
🔗 Related Tools