URL Encoder & Decoder
Escape and unescape URL-unsafe characters in any string or query.
Open toolFree · Online · No install · Private
Base64 Encode & Decode
Encode text or files into Base64 and decode Base64 strings back to text in an instant. Fast, free, and processed entirely in your browser — nothing is ever uploaded.
Try the tool nowAdvertisement
Base64 Encode and Decode tool
Turn plain text or a file into a Base64 string.
Examples: API keys, secrets, JSON, small code snippets. Files are read locally and never leave your device.
Drag & drop a file here
or
Encoded result
🔒 All conversion happens locally in your browser. Your text and files are never uploaded to any server.
How to use this online Base64 encoder & decoder
-
Enter your content
Type or paste plain text, or drag and drop a file into the tool. Choose Encode or Decode above.
-
Convert instantly
Click the Encode or Decode button. The result appears in the output box within a moment.
-
Copy or download
Copy the result to your clipboard or download it as a file. Nothing is stored or sent anywhere.
Why use a free Base64 converter that runs in your browser?
- 100% private & secure. Files and text are processed locally in your browser and never uploaded — a truly secure online Base64 converter.
- Text and file support. Encode and decode plain text, JSON, API keys, and images into Base64 with a fast Base64 file encoder and decoder.
- No install, no sign-up. A base64 encoder online free tool that works instantly with no software or account.
- Offline ready. Works even without an internet connection once loaded, so you can convert image to Base64 on the go.
- Fast and lightweight. A fast Base64 string translator with instant results and large-file support.
- Free forever. No paywalls, no limits, no data caps — a base64 decode online free tool for everyone.
What is Base64 Encode & Decode?
Base64 is a standard way to represent binary data in ASCII text, using 64 printable characters. Encoding turns raw bytes — like the characters in a password, the contents of a file, or the pixels of an image — into a safe string that can travel through systems that only understand plain text, such as email, URLs, or JSON.
This tool wraps the format in a friendly, browser-based Base64 encoder and decoder. Developers use it to prepare API keys, authorization headers, or embed images directly into HTML and CSS as a Base64 string. Security engineers and system administrators rely on it to inspect tokens and configuration blobs. Data analysts and students use it to translate values between tools that expect text-only transport.
Because everything runs in your browser, you can encode text to Base64 or decode a Base64 string to text with confidence that your secrets stay on your own machine. No uploads, no logs, no third-party servers — just fast conversion you control.
Frequently asked questions
Is this a base64 encoder online free tool?
Yes. Base64Toolbox is completely free to use. There are no paywalls, no account requirements, and no usage limits — you can encode and decode as often as you like.
Is there a secure online base64 converter that doesn't upload my data?
Yes. Every conversion happens locally in your browser using JavaScript. Your text and files never leave your device, which makes this a secure online base64 converter you can trust with sensitive strings.
Can I decode a base64 string to text?
Yes. Paste any valid Base64 string into the Decode tab and our base64 decoder online turns it back into plain text instantly, with support for UTF-8 text such as emojis and accented characters.
Can I convert image to base64 online?
Yes. Drop any image file into the Encode tab and this tool converts image to base64 online, giving you a ready-to-use data URI you can embed in HTML or CSS. Files stay local and are never uploaded.
What happens to my files and privacy?
Your files are read directly in your browser and processed on your machine. Nothing is uploaded, stored, or shared. There is no server-side logging of your content. See our Privacy Policy for details.
How large a file can I encode?
This fast base64 string translator handles large files comfortably. For very large files you may see a brief progress message, and we warn you before heavy processing to keep the page responsive.
Advertisement
Legal information
Legal: All processing is done locally in your browser. Read our Privacy Policy, Terms of Service, and Cookie Policy.