Base64 encode/decode (text + file)
Text ↔ Base64, File ↔ Base64 data URL. Copy output or share a link.

Text ↔ Base64

This tool runs only in your browser. It does not upload your input anywhere.

Tip: “Share link” stores your text and options in the URL hash so you can reopen the same conversion.

File ↔ Base64 data URL

Pick a file
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Download filename (optional)
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Tip: For large files, the Base64 string can be very long; sharing it in a URL is not recommended.

About / 關於

Base64 encode/decode (text + file) — Encode/decode Base64 locally, plus file ↔ Base64 data URL conversion. Copy output or download a file. Shareable link for text mode. Browser-only MVP.

Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.

FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.

Base64 編碼/解碼（文字 + 檔案） — 在本機做 Base64 編碼/解碼，並支援檔案 ↔ Base64 data URL 轉換。可複製輸出或從 Base64 下載檔案；文字模式可分享連結。純前端 MVP。

範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。

FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。