Free Base64 Encoder & Decoder - Convert Files & Text Online
Encode files and text to Base64 or decode Base64 strings instantly. Perfect for embedding images in CSS/HTML and data URIs.
What is Base64 Encoder/Decoder?
Our Base64 Encoder/Decoder makes it easy to convert files, images, and text to Base64 encoding or decode Base64 strings back to their original format. Base64 is essential for embedding binary data in text-based formats like HTML, CSS, JSON, and XML.
Base64 encoding converts binary data into ASCII text, making it safe to transmit over text-only channels. It's commonly used for embedding images directly in CSS/HTML (data URIs), sending files via JSON APIs, encoding email attachments, and storing binary data in databases.
Our tool handles both directions: encode any file or text to Base64, or decode Base64 strings back to viewable/downloadable content. It supports images (PNG, JPG, SVG), documents, and any file type. For images, you can preview both original and encoded versions side-by-side.
All encoding and decoding happens locally in your browser. Your files never get uploaded to servers, ensuring complete privacy and security. Perfect for developers working with APIs, email systems, or anyone needing to convert between binary and text formats.
Powerful Features
Everything you need in one amazing tool
Encode to Base64
Convert files, images, and text to Base64 format. Supports all file types and sizes.
Decode Base64
Decode Base64 strings back to original format. Download or view decoded content.
Image Preview
Preview images before and after encoding. See visual representation of encoded images.
Data URI Generator
Create data URIs for embedding images in CSS/HTML. Copy-ready code snippets.
One-Click Copy
Copy encoded Base64 strings to clipboard instantly. Paste directly into your code.
100% Private
All processing happens locally. Files never uploaded to servers. Completely secure.
How It Works
Get started in 4 easy steps
Upload or Paste
Upload file, paste text, or drag-drop image. Supports all file types up to 50MB.
Choose Direction
Select encode (file to Base64) or decode (Base64 to file). Auto-detects input type.
Process Instantly
Tool converts data using browser APIs. Processing happens in milliseconds locally.
Copy or Download
Copy Base64 string or download decoded file. Use immediately in your project.
Why Choose Our Base64 Encoder/Decoder?
Stand out from the competition
Instant Processing
Encode/decode in milliseconds. No waiting for server uploads or processing.
No File Limits
Process unlimited files. No daily limits, no file size restrictions (up to 50MB).
Visual Preview
Preview images before encoding. Verify decoded content before downloading.
Developer Friendly
Clean output format. Generate data URI code snippets ready to paste.
Bidirectional
Encode and decode both supported. Switch between modes seamlessly.
Completely Private
Client-side only. No server uploads. Your files stay on your device.
Perfect For
See how others are using this tool
CSS Background Images
Embed images directly in CSS as data URIs. Reduce HTTP requests and improve load time.
Email Attachments
Encode file attachments for email APIs. Send binary data through JSON/REST APIs.
HTML Inline Images
Embed images in HTML without external files. Perfect for email templates and SVG icons.
Database Storage
Store binary files as text in databases. Save images, PDFs, or documents as Base64.
API Development
Send files via JSON APIs. Decode received Base64 data from API responses.
Configuration Files
Embed credentials or keys in config files. Store certificates and tokens safely.
Frequently Asked Questions
Everything you need to know about Base64 Encoder/Decoder
Base64 is a binary-to-text encoding scheme that converts binary data (like images, files) into ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). This makes binary data safe to transmit through text-only systems like email, JSON APIs, or embed in HTML/CSS. The encoded text is about 33% larger than the original binary data.
Use Base64 when you need to embed binary data in text formats (HTML/CSS data URIs, JSON APIs), send files through systems that only accept text (email protocols), or store binary data in text-based databases. It's perfect for small images, icons, fonts, and configuration data. However, for large files, regular file uploads are more efficient.
No, Base64 encoding actually increases file size by about 33% because it represents binary data using only 64 ASCII characters. It's not compression - it's conversion. If you need to reduce file size, compress first, then encode. Base64 is about compatibility and embeddability, not size reduction.
Yes, but it's best for small images (under 10KB) like icons, logos, or background patterns. Large images make your CSS file huge, slow to parse, and uncacheable separately. Base64 images can't be cached independently and increase CSS file size. Use regular image files with caching for photos and large graphics.
No! Base64 is encoding, not encryption. Anyone can decode Base64 strings instantly - there's no password or key. Don't use it to hide sensitive data. Base64 makes data text-safe for transmission, not secure. If you need security, use proper encryption (AES, RSA) before encoding to Base64.
Absolutely not! All encoding and decoding happens entirely in your browser using JavaScript. Your files are processed locally and never uploaded to our servers. The tool works completely offline once loaded, ensuring total privacy for sensitive files and documents.
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