Bulk URL Encoder & Decoder - Fix Mojibake with Charset Detect

Encode or decode URLs in bulk, line by line. Detect UTF-8 vs GBK to fix mojibake, preview diffs, and copy curl snippets fast and securely in-browser—offline.

Each line is treated as an independent task—handle hundreds of URLs at once.

Detected charset: UTF-8

Original

https://example.com/?q=你好&from=utm_campaign

Processed

https%3A%2F%2Fexample.com%2F%3Fq%3D%E4%BD%A0%E5%A5%BD%26from%3Dutm_campaign

Offline processing only—no parameters are uploaded.

How to Use

  1. Paste one or multiple URLs (one per line).
  2. Choose Encode or Decode.
  3. Copy results per line, or copy CLI snippets.
  4. If output looks broken, use smart detection and try another charset.

Core Features

  • Bulk Processing: Paste multiple URLs and process line-by-line.
  • Encode / Decode: Switch modes instantly.
  • UTF-8 vs GBK Detect: Decode Chinese URLs correctly and fix broken text.
  • Diff Preview: Verify before/after output.
  • CLI Snippets: Copy curl-ready fragments per line.
  • Privacy: Offline, client-side processing—no parameter uploads.

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Calculation Logic

  • Encoding uses encodeURIComponent; decoding uses decodeURIComponent.
  • Charset recovery can use TextDecoder when raw bytes are available.
  • Lines are split by \n so each URL is handled as an independent task.

FAQ

  • Is it free?
    • Yes.
  • Is it safe to paste URLs with tokens?
    • This tool runs locally in your browser and does not upload parameters.
  • How do I decode GBK-encoded URLs online?
    • Use smart detection to identify GBK vs UTF-8 and decode correctly.
  • How do I URL-encode multiple lines at once?
    • Paste your list and we’ll encode/decode each line instantly.