Base64 Encoder Developer
Encode text to Base64, with a URL-safe option.
Base64 Encoder is a free online tool that encode text to Base64, with a URL-safe option. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Developer
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- 1
- Works offline
- Yes, after the first visit
About Base64 Encoder
Base64 Encoder is one of 43 developer tools on DuckyTools, and like all of them it runs entirely inside this page. Encode text to Base64, with a URL-safe option.
How to use it
- Paste the text you want to run through base64 encoder.
- Set url-safe alphabet.
The one setting
| Setting | What it does | Default |
|---|---|---|
| URL-safe alphabet | On or off. Off by default. | Off |
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
| Controls | URL-safe alphabet |
Questions
Is Base64 a form of encryption?
No, and treating it as one is a genuine security mistake. It is a reversible encoding designed to move binary data through text-only channels. Anyone can decode it instantly.
When should I use the URL-safe alphabet?
When the result goes in a URL path, query string or filename. It swaps + and / for - and _ and drops the trailing = padding, none of which survive URL parsing intact.
Why is my encoded text bigger than the original?
Base64 represents three bytes with four characters, so everything grows by about 33%. That is the cost of making binary data safe to paste anywhere.