# Base64 Encoder Decoder Offline

> Encode Unicode text to Base64 and decode Base64 back to text. Everything is processed locally without uploads, tracking, or storage.

Canonical page: [https://chrome-stats.com/d/base64-encoder-decoder-offline](https://chrome-stats.com/d/base64-encoder-decoder-offline)

## Overview

- **ID:** `base64-encoder-decoder-offline`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** v9
- **Category:** web-development
- **Version:** 1.0.0
- **Last updated:** 2026-07-28
- **First published:** 2026-07-25
- **Size:** 17 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/base64-encoder-decoder-offline/)

## Description

<strong>Base64 Encoder Decoder Offline</strong> converts text to Base64 and decodes Base64 back to readable Unicode text directly inside Firefox.

<ul><li>Encode plain text to Base64.</li><li>Correctly handle Unicode text, accented characters, and emoji.</li><li>Decode valid Base64 into readable text.</li><li>Detect malformed Base64 and display a clear error.</li><li>Copy the processed result to the clipboard.</li><li>Clear the workspace with one click.</li><li>Work completely offline.</li><li>Require no registration or account.</li></ul>
<ol><li>Click the Base64 Encoder Decoder Offline icon on the Firefox toolbar.</li><li>Type or paste content into the input field.</li><li>Click <strong>Encode</strong> to convert the text to Base64.</li><li>Click <strong>Decode</strong> to convert valid Base64 back to text.</li><li>Click <strong>Copy Result</strong> to copy the output.</li></ol>

The extension converts text through UTF-8 before creating Base64. This allows it to process international characters and emoji instead of being limited to basic ASCII text.

Base64 is an encoding format, not encryption. Base64 content can be decoded by anyone and should not be used to protect passwords, private keys, or confidential information.

Base64 Encoder Decoder Offline does not collect, save, log, transmit, sell, or share entered content or results.

The extension processes only content manually entered or pasted into the popup. It does not read websites, local files, open tabs, browser history, cookies, saved logins, or account data.

The extension requests no website permissions and uses no content scripts, background scripts, remote code, analytics, advertisements, or external APIs.

Clipboard access occurs only when the user clicks the copy button.

All conversion operations are performed locally inside Firefox. No Internet connection is required.

## Rankings

- #142,351 — Overall
- #120 — offline

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- This permission has no access or impact on the user's system or data, thus carrying no risk.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/base64-encoder-decoder-offline)