Base64 Encoder

UtilitiesNew

Encode and decode Base64 strings.

Nothing Is UploadedRuns In This Browser TabNo Account Needed

How It Works

1

Upload / Input

Select your files or paste your content to get started.

2

Process

The work happens in this browser tab. Your file never leaves your device, so nothing is queued, stored or transmitted.

3

Download / Result

Get your results instantly. Download files or copy output in one click.

Features

Encode text to Base64
Decode Base64 to text
Full Unicode support
File-to-Base64 conversion
Auto-convert as you type
Character count for input and output
One-click copy to clipboard

How to use Base64 Encoder

  1. Choose a direction

    Encode text or a file to Base64, or decode Base64 back.

  2. Provide the input

    Paste the text or Base64 string, or add a file.

  3. Convert

    The result appears ready to copy.

  4. Copy the whole thing

    Base64 strings are long and truncation is the usual cause of a failed decode.

When to use Base64 Encoder

  • Embedding a small image directly in HTML or CSS as a data URI
  • Decoding a Base64 payload while debugging an API
  • Moving binary data through a channel that only accepts text
  • Inspecting the contents of a Base64-encoded configuration value

FAQ

Yes. The tool uses TextEncoder and TextDecoder to handle the full Unicode range, including emoji and multi-byte characters.
Yes. Switch to file mode, upload any file, and get its Base64 data-URL representation instantly.
There is no hard limit, but very large inputs may slow down your browser since everything runs client-side.
No. It is a reversible encoding with no key, decodable by anyone in seconds. It provides zero security — never use it to protect a password, token or key.
Base64 encodes six bits of data per character, so output is roughly 33% larger than the input. That overhead is the price of representing binary as plain text.
Usually truncation, stray whitespace or line breaks introduced by copying, or a URL-safe variant that uses - and _ in place of + and /. Copy the complete string and check which variant it is.
For small images — icons and the like — where saving a network request outweighs the 33% size penalty. For anything larger, a separate file that browsers can cache independently is better.

Related Tools

New

Hash Generator

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes.

utilities
Popular

Text Utilities

Case conversion, line cleanup, sorting and live text statistics.

utilities
New

Unit Converter

Convert between length, weight, volume, and more.

utilities
New

Length Converter

Convert between metric and imperial lengths.

utilities

About Base64 Encoder

Base64 represents binary data using only printable ASCII characters. Its purpose is transport: getting binary through systems that only handle text, such as email bodies, JSON payloads and URLs. The cost is size — Base64 output is about 33% larger than the input, because it uses six bits of information per eight-bit character.

The most important thing to understand is that Base64 is not encryption and offers no security whatsoever. It is a reversible encoding with no key, and anyone can decode it instantly. Base64-encoding a password or an API key hides it from a casual glance and from nothing else.

The common practical use is data URIs — embedding a small image directly into HTML or CSS instead of loading it as a separate file. This saves a network request, which is worthwhile for a small icon and counterproductive for anything larger, since the inflated data cannot be cached separately and bloats every page that includes it.

Tips and limits

  • Base64 is encoding, not encryption. It provides no security at all.
  • Output is about 33% larger than the input.
  • Data URIs suit small icons; beyond a few kilobytes a separate cached file is better.
  • Copy the entire string — truncation is the usual cause of decode failures.
  • URL-safe Base64 replaces + and / with - and _; the variants are not interchangeable.