Base64 Encoder / Decoder — Text & File Support
Encode any text or file to Base64 — or decode a Base64 string back to plain text — all in real time inside your browser. UTF-8 safe with drag-and-drop file support for images, PDFs, and binary files. No server upload, no data left behind.
Text to Encode
Instant Encoding
Convert text or files to Base64 in real time — no server round-trip required.
100% Private
Everything runs locally in your browser. Your data never leaves your device.
File Support
Drag & drop any file to encode it. Supports images, documents, and binary files.
Included Base64 Tools
Text to Base64 Encoder
Type or paste any text and get the Base64-encoded result in real time.
Base64 to Text Decoder
Paste a Base64 string and decode it back to readable plain text instantly with a valid/invalid badge.
File to Base64 Encoder
Drag & drop any file — image, PDF, or binary — to encode it to a Base64 string without uploading.
Download Result
Save the encoded or decoded output as a .txt file with one click.
How to Encode or Decode Base64 Online
Choose Encode or Decode
Click the Encode tab to convert text or a file to Base64, or Decode to reverse a Base64 string back to plain text.
Paste text or upload a file
Type into the input area or drag & drop any file to load it automatically.
Copy the result
The output updates in real time — copy it directly from the output panel.
Download if needed
Click Download to save the encoded or decoded result as a .txt file.
Frequently Asked Questions
- Can I encode images and binary files to Base64?
- Yes. Drag and drop any file — images, PDFs, or binary files — into the input area and the tool encodes it to a Base64 string immediately.
- Is this tool UTF-8 safe?
- Yes. ToolMint uses TextEncoder and TextDecoder rather than raw btoa/atob, so multi-byte Unicode characters are handled correctly without data loss.
- How do I decode a Base64 string?
- Click the Decode tab, paste your Base64 string into the input, and the decoded text appears instantly. A validation badge confirms whether the input is valid Base64.
- Are my files uploaded to a server?
- No. All encoding and decoding happens locally in your browser using Web APIs. No file or text is ever sent to any server.
- What is Base64 used for?
- Base64 is commonly used to embed binary data (images, files) in JSON or HTML, transmit data through APIs that only support text, and encode email attachments.