📦 Base64 Encoder/Decoder
Encode and decode text and images to Base64 format. Free online Base64 converter with URL-safe encoding, auto-convert, and image support.
URL-Safe replaces + with - and / with _ for use in URLs
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to encode data that needs to be stored or transferred over media designed to deal with text. Base64 encoding converts binary data into a string of 64 characters (A-Z, a-z, 0-9, +, /).
Base64 encoding increases the size of the data by approximately 33%, but it ensures that the data can be safely transmitted through text-based protocols like email, JSON, XML, or URLs. It's widely used in web development, data storage, and API communications.
Common Use Cases
🌐 Web Development
Embed images directly in HTML/CSS using data URIs. Encode API payloads, authentication tokens, or binary data for JSON transmission.
📧 Email Attachments
Encode binary attachments (images, documents) for email transmission. Many email systems use Base64 encoding for attachments.
🔐 Data Storage
Store binary data in text-based storage systems like databases, configuration files, or JSON documents that don't support binary data natively.
🔗 URL Encoding
Use URL-safe Base64 encoding for data in URLs. URL-safe Base64 replaces + with - and / with _ to avoid URL encoding issues.
Key Features
Text & Image Support
Encode and decode both text strings and images. Upload images to get Base64 data URIs, or decode Base64 back to images.
URL-Safe Encoding
Choose between standard Base64 or URL-safe Base64 encoding. URL-safe format is perfect for embedding in URLs or query parameters.
Auto-Convert
Enable auto-convert to automatically encode text as you type or decode Base64 strings. Real-time conversion for faster workflow.
Size Information
See character count, byte size, and size increase percentage. Understand the encoding overhead for your data.
Export Options
Copy Base64 strings to clipboard or export to text files. Download decoded images directly from Base64 data URIs.
Privacy First
All encoding and decoding happens locally in your browser. We never see, store, or have access to your data.
Frequently Asked Questions
What's the difference between standard and URL-safe Base64?
Standard Base64 uses + and / characters, which need URL encoding in URLs. URL-safe Base64 replaces + with - and / with _, making it safe to use directly in URLs without additional encoding.
How much does Base64 encoding increase file size?
Base64 encoding increases data size by approximately 33%. This is because every 3 bytes of binary data becomes 4 Base64 characters. The exact increase depends on the original data.
Can I encode images larger than 10MB?
Our tool limits image uploads to 10MB to ensure good performance. For larger images, consider compressing them first or using server-side encoding tools.
Is Base64 encoding secure?
Base64 is an encoding scheme, not encryption. It doesn't provide security or privacy - it's just a way to represent binary data as text. Anyone can decode Base64-encoded data.
Do you store my encoded/decoded data?
No, absolutely not. All encoding and decoding happens entirely in your browser. We never see, store, transmit, or have any access to your data. Your privacy is completely protected.