Base64 Encoder/Decoder
Free Base64 encoder decoder online — no signup required. Instantly convert plain text or files to Base64 format and back, with fully client-side processing. Your data never leaves the browser.
Base64 output will appear here
Features
- Encode plain text to Base64 instantly
- Decode Base64 strings back to original text
- File upload support — encode any file to Base64
- Drag-and-drop file upload interface
- Copy output to clipboard with one click
- Works entirely in your browser — no files uploaded to any server
Frequently Asked Questions
What is Base64 used for in web development?
Base64 turns binary data into a safe ASCII string (A–Z, a–z, 0–9, +, /). It is used in APIs, email (MIME), data URLs, and anywhere text-only channels need to carry binary payloads.
How do I encode or decode Base64 online?
Use the Encode tab for text or upload a file; use the Decode tab for Base64 text. Output appears instantly and you can copy it with one click.
How do I encode a file to Base64 online?
Click the File Upload option, select any file from your device, and the tool converts it to a Base64 string in your browser. No file is ever sent to a server.
Is Base64 encoding safe for sensitive data?
No. Base64 is encoding, not encryption — anyone can decode it without a key. Never use Base64 to protect sensitive information. Use proper encryption (e.g. AES) for confidentiality.
Are my files uploaded to a server?
No. All encoding and decoding runs entirely in your browser. No data is sent to PrimeUtil servers.