Base64 Encode & Decode — Free Online
Encode text or files to Base64 and decode Base64 strings back to text. Supports URL-safe encoding. Our screenshot API returns Base64 images — decode them here. Free, no signup.
How it works
Enter your data
Fill in the form fields or paste your content to get started.
Processed in your browser
Everything runs client-side — your data never leaves your machine.
Copy or download results
Get instant results you can copy to clipboard or download.
Features
Encode & Decode
Convert between text and Base64 in both directions.
File Support
Drag & drop files to encode them as Base64 strings.
URL-Safe Mode
Toggle URL-safe encoding for use in URLs and filenames.
Auto-Detect
Automatically detects and handles encoding direction.
Copy & Download
One-click copy for both input and output.
Client-Side Only
All processing in your browser. Your data stays private.
Frequently asked questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. It's commonly used to embed images in HTML/CSS, transmit data over text-based protocols, and encode API payloads.
Why is Base64 used for images?
Base64 allows images to be embedded directly in HTML, CSS, or JSON without separate file requests. Our screenshot API returns images in Base64 format for easy integration.
What is URL-safe Base64?
URL-safe Base64 replaces '+' with '-' and '/' with '_' to make the encoded string safe for use in URLs and filenames without additional encoding.
Does Base64 increase file size?
Yes, Base64 encoding increases data size by approximately 33%. This is the trade-off for being able to represent binary data as text.
Is my data safe?
Yes, all encoding and decoding happens in your browser. Your data is never sent to any server.
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Use cases
API Development
Encode and decode Base64 data when working with APIs that return binary content as Base64 strings.
Image Embedding
Convert images to Base64 data URIs for embedding directly in HTML or CSS.
Data Transfer
Encode binary data for safe transmission over text-based protocols like JSON or XML.