Base64 Encoder
Encode any text, file, or data to Base64 format instantly. Supports standard and URL-safe variants, file upload, live preview and one-click copy.
✅ Free ⚡ Live 📁 File Upload 🔒 Private
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Base64 Encoder ⚡ Live⚡
Live Conversion
Output updates as you type — no button needed. Instant feedback on every keystroke.
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File Upload
Encode any file to Base64 directly in the browser — images, PDFs, documents.
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URL-safe Variant
Switch between standard Base64 (+ / =) and URL-safe Base64 (- _ no padding).
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100% Private
All encoding runs in your browser using the built-in btoa() API. Nothing is sent anywhere.
⭐ User Reviews
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Alex T.
Yesterday
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Saved me hours. The live conversion and character counter are exactly what I needed for debugging API payloads.
Encoder ToolsS
Sofia K.
2 days ago
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Super clean interface. The stats panel showing input vs output size ratio is incredibly useful for understanding encoding overhead.
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Dan M.
3 days ago
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I use this daily for development work. Fast, private, no ads. The sample button lets me test edge cases instantly.
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Laura B.
1 week ago
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Handles Unicode and special characters perfectly. The error messages are clear and tell me exactly what went wrong.
Encoder Tools📖 How to Use
1
Paste your text
Type or paste any text, JSON, URL or data into the input field.
2
Choose variant
Select Standard or URL-safe Base64 from the dropdown.
3
Copy the output
The Base64 encoded string is ready — click Copy Base64.
4
Upload a file
Click Upload file to encode a binary file like an image or PDF.
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❓ FAQ
What is Base64 encoding?+
Base64 converts binary data to ASCII text using 64 printable characters (A–Z, a–z, 0–9, + and /). It increases data size by ~33% but makes binary data safe for text-based systems like email and JSON.
When should I use URL-safe Base64?+
Use URL-safe Base64 (with - and _ instead of + and /) when embedding Base64 in URLs, JWT tokens, or filenames. Standard Base64 with + and / can break URLs if not percent-encoded.
Why does Base64 end with == ?+
The = padding ensures the output length is a multiple of 4. One = means 1 padding byte; == means 2. URL-safe Base64 often omits this padding.
Can I encode files with this tool?+
Yes. Click Upload file to encode any file to Base64 in your browser. The result can be used in data URIs (e.g. src="data:image/png;base64,…") for embedding images in HTML.
What is the size overhead of Base64?+
Base64 increases data size by approximately 33%. A 100-byte file becomes ~136 Base64 characters. The stats panel shows the exact ratio for your input.