Base64 encode text, strings, and files online
Convert text, strings, or small files to Base64, decode Base64 back to text or file data, and copy or download the result without uploading your input.
How to use this tool
- 1
Choose Base64 encode or decode
Select Encode for text-to-Base64 conversion or Decode to restore Base64 input.
- 2
Choose text or file input
Use text input to encode a string to Base64, decode Base64 text, or process small files.
- 3
Review output
Check the generated Base64 text or decoded file result.
- 4
Copy or download
Copy text output or download a file when needed.
What it can do
Text and file support
Work with pasted text or small local files.
Base64 encode and decode
Switch between encoding and decoding without leaving the workspace.
Base64 decoder
Decode Base64 strings, API payloads, or Base64 text files back into readable output.
Chunked text output
Encoded text is wrapped for easier reading and copying.
Local processing
Encoding and decoding happen in your browser.
Useful for
- Encoding a string to Base64
- Decoding Base64 strings from APIs
- Embedding small assets in HTML or CSS
- Inspecting Base64 API data
- Testing encoded payloads
- Converting small files for development workflows
Limits to know
- Base64 is not secure encryption
- Large files are intentionally limited for browser performance
- Decoded binary data may need the correct file extension after download
Private browser processing
This tool runs locally in your browser. TunerPage does not upload the working file or text to its servers.
Frequently asked questions
What is Base64 used for?
Base64 turns binary data into plain text so it can be embedded in text-based systems such as JSON, HTML, email, or configuration files.
How do I Base64 encode a string?
Choose Encode, keep Text selected, paste the string, and copy the Base64 output.
How do I decode Base64 online?
Choose Decode, paste a Base64 string, and the decoded text appears instantly. You can also decode a Base64 text file.
Can I decode Base64 into a file?
Yes. Upload a Base64 text file in decode mode and download the decoded result.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode it.