Free Base64 Encoder & Decoder
Encode text or files to Base64 format, or decode Base64 strings back to plain text — instantly in your browser. No signup, no server, no upload. Works with text, URLs, JSON, and any file type.
3 Simple Steps
Choose Encode or Decode
Select whether you want to convert text to Base64 or decode a Base64 string back to readable text.
Paste Text or Upload File
Enter your text in the input box, or switch to File tab to encode any file directly to Base64.
Copy the Output
Click the action button and copy the result. Use Swap to chain encode and decode operations.
Why Use ConvertLinx Base64 Tool?
Encode Text & Files Both
Switch between text mode and file mode. Encode plain strings or upload any file — images, PDFs, documents — and get the Base64 output instantly.
Two-Way with Swap
Encode and decode in the same tool. Use the Swap button to instantly send output back as input — perfect for chaining operations without copy-paste.
Built for Developers
Works with any text — plain strings, JSON payloads, URLs, auth tokens, data URIs, and API responses. Everything you need for daily dev work.
What Is Base64 and Why Is It Used?
Base64 is a binary-to-text encoding scheme that converts data into a string of 64 printable ASCII characters. It was designed to safely represent binary data in environments that only handle text — such as email bodies, HTML attributes, JSON payloads, and HTTP headers.
When you embed an image directly into a CSS file as a data URI, authenticate with a Basic Auth header, or store a small file inside a JSON API response — you are using Base64. It is one of the most common encoding formats in modern web development and API design.
Base64 Encoding vs Encryption — Key Difference
Base64 is often confused with encryption, but they are completely different. Encoding only changes the format of data so it can travel safely — anyone can decode a Base64 string with no key or password. Encryption, on the other hand, scrambles data so only someone with the correct key can read it. Never use Base64 to protect sensitive information — use it only for safe data transmission and storage of non-sensitive content.
Common Use Cases for Base64
Who Should Use This?
Features
Best Uses for an Online Base64 Tool
Frequently Asked Questions
What is Base64 encoding?
Base64 is a method of converting binary data — like files or special characters — into a plain text string using 64 printable ASCII characters. It is widely used to safely transmit data in URLs, emails, and APIs where binary content could cause problems.
Is this Base64 tool free?
Yes — completely free with no signup required. Encode and decode unlimited text or files as many times as you need.
Does Base64 encoding encrypt my data?
No. Base64 is encoding, not encryption. It only changes the format of data to make it safe to transmit as text. Anyone can easily decode a Base64 string — it provides no security. For security, use proper encryption like AES.
What can I use Base64 encoding for?
Common uses include embedding images in HTML or CSS as data URIs, encoding binary files for email attachments, passing data safely in URL query strings, storing small files in JSON APIs, and working with authentication tokens.
Can I encode a file to Base64?
Yes — switch to the File tab and upload any file. The tool converts it to a Base64 string instantly in your browser. This works for images, PDFs, and most other file types.
Why is Base64 output longer than the original?
Base64 encoding increases data size by approximately 33%. This is a known trade-off — every 3 bytes of original data becomes 4 characters of Base64 output.
Does it work offline?
Yes — everything runs entirely in your browser. No internet connection is needed after the page loads. Your data never leaves your device.
Is my data stored anywhere?
No — your text and files are never sent to any server. All encoding and decoding happens locally inside your browser. Full privacy guaranteed.
Does it work on mobile?
Yes — works perfectly on iPhone, Android, tablets, and desktops. The layout adapts cleanly to any screen size.
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