Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings instantly in your browser. No signup, no watermarks, 100% private — everything runs in your browser.
How It Works
Select your mode, input your data directly or click "Upload File", and get instant results. Everything processes locally in your browser — ensuring zero latency and 100% data security.
100% Secure
Runs entirely in your web browser
File to Base64
Securely convert files to Data URIs
Real-time conversion
Instantly encodes or decodes as you type
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Why Use SwiftTools Base64 Encoder/Decoder?
🛡️ Zero-Trust Security
Never upload sensitive strings or private API keys to unsecured backends. Our Base64 engine executes exclusively on your localhost device.
🖼️ File to Data URI conversion
Easily upload small images, fonts, or PDFs. We instantly crunch the byte array and output formatted Base64 strings perfect for embeddable code.
💾 Download Decoded Streams
Whenever you paste valid Base64 data strings into our decoder, the engine calculates the byte composition and lets you effortlessly download the compiled Blob back as a usable file.
⚡ Immediate Reactive Interface
There are no "Process" submit buttons required. Our UI updates the computed output synchronously as you type, creating the fastest possible conversion experience.
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Base64 Encoder/Decoder: Frequently Asked Questions
Is Base64 Encoder/Decoder free to use?
Yes, Base64 Encoder/Decoder on SwiftTools is completely free with no signup, no watermarks, and no usage limits. Everything runs in your browser for maximum privacy.
Is my text data kept private?
Absolutely. Your text is processed locally in your web browser — nothing is uploaded to any server. Your writing stays on your device at all times.
Do I need to install any software?
No installation required. Base64 Encoder/Decoder works directly in any modern web browser on Windows, Mac, Linux, iOS, or Android.
Can I convert images or other files to Base64?
Yes! Simply use the "Upload File" feature inside encode mode. The tool will parse your file locally and instantly generate a full Base64 Data URI perfectly formatted for HTML or CSS.
How do I download a decoded Base64 image or file?
Simply paste your Base64 string into the Decoding tool. If the raw byte code represents a correct file pattern, a "Download File" button will appear to let you save it to your computer.