Encode text, decode Base64 strings, or turn files into data URLs — all in your browser. Nothing gets uploaded anywhere.

Input
Empty
Click to Upload Image

PNG, JPG, WebP, SVG supported.

Output

Paste Base64 or plain text on the left to see the result here.

Analysis
0 B
Input Size
0 B
Output Size
0
Characters
0
Lines
Mode Encode
Status Empty
Detected Type None

What you can do with this tool

No sign-up, no uploads, no nonsense. Just Base64 encoding and decoding that works.

Text to Base64

Paste any text and get the encoded output instantly.

File Upload

Drop a file to get its Base64 data URL with correct MIME type.

Image Preview

Decoding an image? You'll see a live preview right here.

Fully Offline

Everything happens in your browser. Zero server calls.

You might also need

Other tools developers frequently use alongside Base64 conversion.

Explore All

Image Compressor

Compress images without losing quality.

Explore Tool

Image Converter

Convert between image formats.

Explore Tool

JSON Formatter

Validate & format JSON.

Explore Tool

Hash Generator

Generate MD5/SHA hashes.

Explore Tool

Technical Use Cases

If you have ever pasted a long string of random-looking characters into a terminal, an API request, or a CSS file, you were likely working with Base64.

Base64 represents binary data such as images and files using plain ASCII characters. It is useful for embedding data into formats that support text while helping prevent corruption during transfer.

How to Use

  1. Paste your plain text or Base64 string into the input box.
  2. Select the Encode or Decode mode.
  3. Review the output generated in your browser.
  4. Copy the result or download the decoded file.

About this tool

Everything runs securely in your browser. Your text, files, and encoded output never hit a server — there's no backend processing involved at all. This makes it safe to use with API keys, tokens, certificates, or any other sensitive data you'd rather not paste into a random website.

Frequently Asked Questions

Does Base64 encoding increase file size?

Yes. Base64 encoding typically increases the data size by approximately 33%. This is because every 3 bytes of binary data are represented by 4 characters of ASCII text.

Is my data secure?

Yes. Base64 processing happens in your browser and your input is not uploaded to the server.

When should I use Data URIs?

Data URIs are ideal for small assets like icons, SVG patterns, or tiny UI sounds. Embedding them directly in CSS reduces HTTP requests, which can improve perceived performance, though it should be avoided for large images due to the 33% overhead.

Why does Base64 make files larger?

Base64 represents every three bytes with four text characters, which adds about 33% overhead.

Is Base64 a form of encryption?

No. Base64 is an encoding scheme, not encryption. It is designed to be easily reversible and does not provide any security or obfuscation. Never use it to "hide" sensitive information without actual encryption wrappers (like AES).

Is Base64 encryption?

No. Base64 is reversible encoding, not encryption, and should not be used to protect secrets.