Base64 Encoder & Decoder Online 2026
Encode text, files or images to Base64 • Decode Base64 strings back • Supports file upload & image preview • 100% private – runs in your browser
Input – Text or File
Output
Why Use Our Base64 Encoder / Decoder in 2026?
🔒 100% Private
No data uploaded – everything stays in your browser.
📁 File & Image Support
Encode images/files to data URI or plain Base64 – decode back to text.
⚡ Instant & Offline
Works offline after first load – perfect for quick API/debug tasks.
Base64 Best Practices & Common Uses 2026
- Use Base64 for small images in HTML/CSS (data:image/png;base64,...) – reduces HTTP requests
- Encode API tokens, binary data in JSON payloads
- Never use Base64 for large files (>1–2 MB) – it increases size by ~33%
- Decode Base64 safely – always validate output length/format
- Modern alternative in 2026: use binary data directly with fetch + Blob when possible
- Common mistake: forgetting to handle UTF-8 properly (use encodeURIComponent + unescape)
Frequently Asked Questions
No – Base64 is just encoding, not encryption. Anyone can decode it instantly. Use it only for data transport, not for hiding secrets.
It converts 3 bytes → 4 characters (6-bit chunks), adding ~33% overhead. Use only for small data.
Yes – upload any image → get data URI (ready for HTML 
) or plain Base64.
It makes binary data safe to include in JSON, URLs, HTML attributes without special character issues.
Yes – after loading the page once, it works fully offline.
Need to encode or decode Base64 fast?
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