Base64 Encoder & Decoder
Instantly convert images to Base64 strings or decode Base64 back to images. Built for developers and designers — everything runs in your browser, nothing is uploaded.
Base64 Encoder / Decoder
Drag & Drop or Click to Browse — Real‑time conversion
Drag & Drop or Click to Browse
Images, Text, Documents (max 50MB, client-side)
⚡ Auto-process enabled — paste or type triggers conversion instantly.
100% Private & Secure
All processing happens directly in your browser using local client-side JavaScript. Your files and strings are never uploaded to any server. No logs, no cookies, and no data tracking.
code SkillsInsider Tools Integrity
Engineered to run 100% in your browser. Because this utility processes your data entirely within your local device memory, your files never touch a third-party server. This completely eliminates data privacy risks while delivering instant, desktop-grade execution speeds.
How to Use Base64 Tool
Upload or Paste
Drag an image onto the drop zone or paste a Base64 string directly. The tool automatically detects whether to encode or decode.
Choose Direction
Use Switch to Decode to flip between encoding and decoding. Encoding outputs a clean Base64 string; decoding shows the image preview.
Export & Use
Copy the Base64 string for HTML/CSS embedding, or download the decoded image. Perfect for data URIs, inline images, and API payloads.
What Is Base64?
Base64 is a binary‑to‑text encoding scheme that represents binary data in an ASCII string format. It's widely used on the web to embed images directly into HTML or CSS via data URIs, avoiding extra HTTP requests.
With our Base64 encoder, you can convert any image — PNG, JPEG, WebP, SVG — into a Base64 string you can paste straight into your code. The Base64 decoder takes that string and turns it back into a viewable image, perfect for debugging API responses or embedding clean raw data directly into your source code without uploading a single file.
Your data never leaves your computer, keeping your development workflow 100% private. Pair this with our CSS Minifier or AVIF Converter to complete your speed optimization toolkit.
visibility Live Example
Decoded SVG preview — pure client‑side magic.
Frequently Asked Questions
Paste your Base64 string into the input area. The tool auto-detects the image format (PNG, JPG, WebP) and generates a live preview plus a download link — no coding required.
Absolutely. The conversion happens instantly using client-side JavaScript. Because there is no backend server handling your files, your sensitive data is entirely safe from leaks or interception.
The most common reason is a missing data header like data:image/png;base64,. Our tool automatically attempts to fix broken headers. If it still won't render, double-check that the string wasn't accidentally cut short when you copied it.
Yes! You can encode any text or binary file up to browser memory limits. The tool produces a standard Base64 string you can use in data URIs, JSON payloads, or CSS.
A data URI embeds file content directly in your HTML or CSS as src="data:image/png;base64,...". Use it for small icons to eliminate HTTP requests, but avoid it for large images as it increases page size significantly.
No — Base64 encoding actually makes files about 33% larger than the original binary. It's not a compression format; it's a text-safe encoding to transmit binary data through text channels like HTML, CSS, or JSON.