All-in-One Tools
Back to Developer Tools

Base64 Encoder/Decoder

Encode and decode Base64 strings and files.

How to Use

  1. Paste text or upload a file.
  2. Click Encode or Decode.
  3. Copy the result.
Was this tool helpful?

Frequently Asked Questions

Is there a size limit?

Text is unlimited. Files up to 5MB are supported.

Base64 Encoder Guide: Encode Images, Files, and Data URLs for the Web

Base64 turns binary data into ASCII-safe text that travels reliably through URLs, JSON, and email. A Base64 encoder handles images, fonts, and files so you can embed or transmit them without corruption.

Binary data and text protocols do not mix well. Base64 bridges that gap by encoding every three bytes into four ASCII characters. A Base64 encoder makes the conversion instant, letting you embed images in CSS, attach files to API calls, or store small assets inside JSON.

What Is a Base64 Encoder?

A Base64 encoder reads binary input and maps it to a 64-character alphabet of uppercase, lowercase, digits, and two punctuation marks. The output is safe for transmission through systems that expect plain text, such as email bodies, URL query strings, and JSON values. It is not compression or encryption; it is a reversible encoding scheme.

Use Cases

  • Inline images – Embed SVG or small PNG icons as data URIs in stylesheets.
  • API file uploads – Send documents as Base64 strings inside JSON POST bodies.
  • Email attachments – Encode binaries for MIME multipart messages.
  • Authentication headers – Construct Basic Auth strings from username and password.

How to Use Our Base64 Encoder

  1. Paste your text or upload a binary file such as an image.
  2. Select standard or URL-safe Base64 output depending on your target system.
  3. Click encode and copy the resulting string.
  4. Use the decode tab to reverse the process when receiving Base64 data.

Tips for Maximum Impact

  • Base64 inflates file size by roughly 33 percent; only embed small assets.
  • Use URL-safe Base64 when encoding for query parameters to avoid plus-sign issues.
  • Data URIs bypass HTTP caching for the asset itself; consider HTTP/2 server push instead for larger files.
  • Never treat Base64 as security; the string decodes instantly with no key required.

Ready to try it?

Use our free Base64 Encoder/Decoder now. No signup required.

Related Tools

  • Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files.
  • JSON Formatter — Format, validate, and minify JSON data with syntax highlighting.
  • Color Converter — Convert between HEX, RGB, HSL, and CMYK color formats.

External Resources