ローカル処理

オンラインデコーダー

コピーした文字列、ログ、API スニペットを専門ツールへ進む前に読みやすくします。

Runs locallyNo uploadYour input is processed in your browser.

オンラインデコーダー

Base64、URL エンコード文字列、HTML エンティティをローカルでデコードします。

このツールとは?

An online decoder is a general-purpose first stop for encoded strings. It helps you try Base64, URL percent-decoding and HTML entity decoding, then move to the dedicated Base64, URL, JWT or HTML tools when a workflow needs more detail.

入力例

  • SGVsbG8gd29ybGQ=
  • luma%20ai%20video%20generator
  • <strong>LumaTool</strong>
  • https%3A%2F%2Fexample.com%2F%3Fq%3Dbase64%2520a%2520texto

出力例

  • Hello world
  • luma ai video generator
  • <strong>LumaTool</strong>
  • https://example.com/?q=base64%20a%20texto

よくある用途

  • Quickly decode strings copied from logs, browser DevTools, API responses or support tickets.
  • Turn base64 a texto without opening a heavier workflow.
  • Decode URL parameters before checking redirects or tracking links.
  • Restore HTML entities in snippets from CMS fields or escaped source.
  • Identify whether a value needs Base64, URL, HTML or JWT handling next.

ベストプラクティス

  • Start with the least destructive decode mode and keep the original input visible.
  • Decode one layer at a time when a value is nested or double encoded.
  • Do not decode untrusted HTML and then paste it into a live page without review.
  • Move to JWT Decoder when the value has three dot-separated token segments.
  • Use Base64 and URL Encoder pages for advanced options after the quick decode.

よくあるエラー

  • Trying Base64 on a URL-encoded string.
  • Decoding twice and accidentally changing intended percent signs.
  • Expecting HTML entity decoding to sanitize unsafe markup.
  • Assuming every encoded string is encrypted or secret.
  • Copying invisible whitespace from logs into the input.

プライバシーと処理方法

This tool runs in your browser. Text values are processed locally and are not uploaded to LumaTool servers.

Base64 quick decode

入力例
SGVsbG8gd29ybGQ=
出力例
Hello world

This is the common base64 to text workflow for copied samples.

URL quick decode

入力例
luma%20ai%20video%20generator
出力例
luma ai video generator

Use this when a query value or redirect parameter is hard to read.

プライバシーに関する注意

This tool runs in your browser. Text values are processed locally and are not uploaded to LumaTool servers.

使い方

  1. ステップ 1. Paste the encoded string into the decoder.
  2. ステップ 2. Choose Base64, URL or HTML entity decoding.
  3. ステップ 3. Read any validation message and try another mode if the string was encoded differently.
  4. ステップ 4. Copy the decoded result or continue in the related specialist tool.

実際の利用例

Quickly decode strings copied from logs, browser DevTools, API resp...

Quickly decode strings copied from logs, browser DevTools, API responses or support tickets.

Turn base64 a texto without opening a heavier workflow

Turn base64 a texto without opening a heavier workflow.

Decode URL parameters before checking redirects or tracking links

Decode URL parameters before checking redirects or tracking links.

主な用途

  • Quickly decode strings copied from logs, browser DevTools, API responses or support tickets.
  • Turn base64 a texto without opening a heavier workflow.
  • Decode URL parameters before checking redirects or tracking links.
  • Restore HTML entities in snippets from CMS fields or escaped source.
  • Identify whether a value needs Base64, URL, HTML or JWT handling next.

FAQ

Which decoder should I try first?

If the text contains %, try URL decode. If it contains &lt; or &amp;, try HTML entities. If it is mostly letters, numbers, +, / and =, try Base64.

Can this decode encrypted data?

No. Encoding is reversible formatting. Encryption requires a key and cannot be decoded by a general online decoder.

What if the result still looks encoded?

The value may be nested or double encoded. Decode one layer at a time and compare with the original.

オンラインデコーダー は何に向いていますか?

オンラインデコーダー は、ブラウザ上で素早く確認、変換、整理、整形したい 開発者ツール 系の作業に向いています。

入力内容はどのように扱われますか?

This tool runs in your browser. Text values are processed locally and are not uploaded to LumaTool servers.

出力を本番作業に使えますか?

利用できますが、本番設定、データ、コードへ反映する前に結果を必ず確認してください。

関連ツールは現在の言語で開きますか?

はい。関連ツールのリンクは現在の locale に合わせたパスを使用します。

モバイルブラウザでも使えますか?

はい。ツール、例、FAQ、結果エリアはデスクトップとモバイルの両方で使えるように設計されています。

関連ツール