Base64 Encoder & Decoder
Encode and decode text, images, or files to and from Base64 representation locally.
Drag & Drop Image or Click to Browse
Supports PNG, JPG, WebP, SVG, GIF (Max 10MB)Drag & Drop File or Click to Browse
Supports all file types (Max 15MB)Dedicated Base64 Tools
Use these focused tools for specific Base64 operations:
What is the Base64 Encoder & Decoder?
Base64 is a binary-to-text encoding scheme that converts binary data into a string of 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). Originally designed for safely transmitting binary content over text-only protocols like email (MIME), Base64 is now used everywhere — embedding images in HTML and CSS via Data URLs, encoding payloads inside JSON Web Tokens, storing binary blobs in text-based databases, and transferring files through REST APIs. This tool lets you encode and decode text, convert images to Data URLs, and encode arbitrary files entirely in your browser with zero server interaction.
How to use the Base64 Encoder & Decoder?
- Choose your operation mode from the tabs at the top: 'Text Encoder/Decoder' for plain text, 'Image ↔ Base64' for images, or 'File to Base64' for any binary file.
- For text encoding, type or paste your plain text into the left input panel and click 'Encode →' to convert it to a Base64 string. The result appears in the right panel instantly.
- For text decoding, paste a Base64-encoded string into the left panel and click '← Decode' to reveal the original plain text content.
- For image-to-Base64 conversion, drag and drop an image (PNG, JPG, WebP, SVG, GIF) onto the drop zone or click to browse. The tool generates the full Data URI string you can embed directly in HTML or CSS.
- To convert a Base64 string back to an image, paste the encoded string into the 'Convert Base64 to Image Preview' area and click 'Render Image'. A live preview and download link appear below.
- For binary files (PDFs, ZIPs, documents), use the 'File to Base64' tab. Drop or select any file up to 15 MB and toggle the 'Include Data URI Header' option based on your use case.
- Click 'Copy Output' at any time to copy the active tab's result to your clipboard. All processing happens entirely in your browser — no data is sent to any server.
Frequently Asked Questions
Is this Base64 tool safe for sensitive data?
Yes. This tool runs entirely in your browser using JavaScript. Your text, images, and files are never sent to any server — they never leave your device. This makes it completely safe for API keys, private documents, credentials, and any other confidential data.
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data as ASCII characters using 64 symbols (A–Z, a–z, 0–9, +, /). It allows binary content to be safely transmitted over text-only channels like email, JSON payloads, and HTML attributes.
When should I use Base64 encoding?
Common use cases include embedding images directly in HTML or CSS (Data URIs), encoding data for URLs and JSON payloads, email attachments (MIME encoding), and storing binary data in text-only formats like XML or configuration files.
Does Base64 increase file size?
Yes, Base64 encoding increases data size by approximately 33% because every 3 bytes of binary data become 4 Base64 characters. Use Base64 for convenience and compatibility, not for compression.
What is a Base64 Data URL?
A Base64 Data URL uses the format data:[mediatype];base64,[data]. It allows you to embed images and other resources directly in HTML or CSS without making separate HTTP requests, reducing page load overhead for small assets.
Can I decode any Base64 string?
Only valid Base64 strings can be decoded. Valid Base64 uses characters A–Z, a–z, 0–9, +, and / with optional = padding at the end. If your string contains invalid characters, the decoder will report an error. Make sure to remove any extra whitespace or line breaks before decoding.
Base64 Encoder Features
Text Encoding & Decoding
Convert any plain text to Base64 and back with full UTF-8 support. Handles multi-byte characters, emojis, and special symbols correctly using TextEncoder/TextDecoder APIs.
Image to Base64 Data URI
Drag and drop any image (PNG, JPG, WebP, SVG, GIF) to generate a complete Data URI string you can embed directly in HTML img tags or CSS background properties.
Base64 to Image Preview
Paste a Base64-encoded image string to instantly render a live preview with dimensions displayed. Download the decoded image file with one click.
Binary File Encoding
Encode PDFs, ZIPs, documents, and any binary file up to 15 MB into a transferable Base64 string. Toggle the Data URI header on or off based on your use case.
100% Client-Side & Private
No data is ever sent to a server. All encoding and decoding runs locally in your browser using native JavaScript APIs. Safe for credentials, private keys, and internal assets.
Instant Copy to Clipboard
One-click copy for any output — encoded strings, Data URIs, or decoded text. Works across all tabs so you can quickly paste results into your code or configuration files.
Related Developer Tools
Working with encoded data? These tools pair well: