Base64 Encode Decode: free online, fast and secure
Base64 represents any data using only letters, numbers, + and /, so it can travel safely through email, URLs, JSON and HTTP headers. Developers meet it in APIs, authentication headers, data URIs and tokens.
This tool encodes and decodes Base64 with proper UTF-8 handling, so Hindi, emoji and special characters work. It also supports URL-safe Base64 and encoding any file.
How to use Base64 Encode Decode
- Enter text or choose a file. Plain text goes left, Base64 right.
- Encode or decode. Use the buttons in either direction.
- Copy. Copy the result.
Why use ConvertKaro Base64 Encode Decode? Free, fast and secure
Here is what makes this Base64 Encode Decode tool different from most websites.
100% Free
Every feature of this tool is free for everyone. We do not lock better quality or bigger files behind a paid plan.
Fast results
Your file is processed right inside your browser, so there is no upload or download queue. Most jobs finish in a second or two, even on a slow mobile connection.
Secure and private
Privacy is built in: the conversion runs locally with JavaScript, so your data is never sent to us or anyone else. Close the tab and everything is gone.
No signup, no watermark
No registration and no watermark, ever. What you download is exactly your file.
Works on every device
Works in Chrome, Safari, Edge and Firefox on Android, iPhone, Windows, Mac and Linux. No app to install.
UTF-8 and URL-safe
Handles any language and the URL-safe variant used in JWTs.
ConvertKaro vs other websites and apps
| ConvertKaro | Typical website or app | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your data | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
Common uses for Base64 Encode Decode
- HTTP Basic Auth headers
- Embedding small files in JSON
- Reading encoded API fields
- Email attachments and MIME
- Debugging tokens and cookies
Tips for the best results
- Base64 is encoding, not encryption; anyone can decode it.
- URL-safe Base64 replaces + and / with - and _.
- For images use Image to Base64.
- For JWTs use the JWT Decoder.
Good to know
Small utilities like Base64 Encode Decode save time every day: no need to open an IDE, install a package or write a script for a quick check. The tool follows the same standards used by browsers and Node.js, so results match what your code will do. Bookmark this page or add it to your home screen to keep it one click away.
| Price | Free, no limits |
|---|---|
| Processing | In your browser, instant |
| Signup | Not required |
| Watermark | None |
| Works on | Android, iPhone, Windows, Mac, Linux |
| Category | Developer tools |
How Base64 Encode Decode keeps your code and data private
Everything you enter into Base64 Encode Decode stays on your device. The tool works offline once the page has loaded, because all the logic is in the page itself rather than on a server. We never receive, log or store your code and data, so you can use it at work, at school or for personal matters without worrying about privacy.
Using Base64 Encode Decode on your phone
On a phone, open this page in Chrome or Safari, tap the main button and pick or paste what you need. Results download straight to your phone, usually into the Downloads folder or Files app. You can also add this page to your home screen for one-tap access next time.
Who uses Base64 Encode Decode?
Base64 Encode Decode is used every day by people from many backgrounds, for example:
- Web developers and programmers
- Students learning coding and web design
- Digital marketers and SEO specialists
- Testers and support engineers debugging data
- Small business owners managing their own websites
Supported input: Plain text, JSON, CSS, JavaScript, HTML, URLs, Base64, tokens and image files where relevant.
Frequently asked questions
Is Base64 secure?
No. It is just a different representation of data and can be decoded by anyone.
Why does decoding show strange characters?
The original data was probably binary (like an image), not text.
Does it support Hindi?
Yes, text is encoded as UTF-8.
Is Base64 Encode Decode really free?
Yes, completely free. You can use it as many times as you want, and every option on the page is included at no cost.
Is it safe to use Base64 Encode Decode online?
Yes. Your data are processed inside your own browser and are never uploaded to our servers, so nobody else can see them.
Does Base64 Encode Decode work on mobile?
Yes, the tool is built mobile-first. Open this page on your phone, add your data and download the result directly.
Do I need to install anything to use Base64 Encode Decode?
No. Base64 Encode Decode works in your web browser. There is no app, plug-in or extension to install.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Copy or download the result as it is.
Does Base64 Encode Decode work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.
Related free tools
You may also find these tools useful: URL Encode Decode, Image to Base64, Base64 to Image, JWT Decoder, Hash Generator.