Quite Nice Stuff

Iris Translate provides flexible website translation with two distinct methods to suit your needs:
Automatic Mode (Free) – Uses Google Translate’s client-side widget for instant translation with no setup required.
Google Cloud API Mode – Server-side translation with SEO-friendly translated URLs, hreflang tags, and full search engine indexability. Free for most websites (see below).
<h4>Key Features</h4>
Translation Methods
<ul>
<li>Automatic Translation – Free client-side translation using Google Translate widget, no API key needed</li>
<li>Google Cloud API Translation – Server-side translation for SEO-friendly, indexable translated content</li>
<li>Configurable fade-in delay to hide flash of untranslated content (Automatic mode)</li>
</ul>
SEO & URL Translation
<ul>
<li>SEO-friendly translated URLs (e.g., <code>/fr/a-propos/</code> instead of <code>/about/</code>)</li>
<li>Automatic hreflang tag generation for proper search engine indexing</li>
<li>Translated URL management interface with bulk translation tools</li>
<li>Individual URL path customization per language</li>
</ul>
Custom Translation Overrides
<ul>
<li>Override any automatic translation with your own custom text</li>
<li>Frontend translation editor for logged-in administrators</li>
<li>Edit translations directly on the page while browsing your translated site</li>
<li>Manage all custom translations from the admin dashboard</li>
</ul>
Language Selector Widgets
<ul>
<li>Multiple widget styles: Dropdown, Dropdown with flags, List, List with flags</li>
<li>Floating language selector with configurable position (corners of the screen)</li>
<li>Widget support for sidebars</li>
<li>Shortcode support: <code>[iris_translate]</code></li>
<li>PHP function support for theme integration</li>
<li>Display language names in their native script (e.g., “日本語” instead of “Japanese”)</li>
</ul>
Supported Languages
Over 25 languages supported including: English, Spanish, French, German, Italian, Portuguese, Dutch, Russian, Japanese, Korean, Chinese (Simplified & Traditional), Arabic, Hindi, Turkish, Polish, Swedish, Norwegian, Danish, Finnish, Greek, Czech, Romanian, Hungarian, Thai, Vietnamese, and Indonesian.
<h3>External Services</h3>
This plugin connects to Google services to provide translation functionality. By using this plugin, you agree to Google’s terms of service.
<h4>Automatic Translation Mode</h4>
When using Automatic Translation mode, this plugin loads the Google Translate Widget from Google’s servers.
What this service does: Provides client-side (in-browser) translation of your website content.
When data is sent: When a visitor selects a language to translate to, their browser communicates directly with Google Translate servers to fetch translations.
What data is sent: 
* The text content of the webpage being translated 
* The visitor’s IP address (sent by their browser to Google) 
* Browser cookies set by Google (including the <code>googtrans</code> cookie to remember language preference)
Service provider: Google LLC
Links: 
* <a href="https://translate.google.com/" rel="nofollow ugc">Google Translate</a> 
* <a href="https://policies.google.com/privacy" rel="nofollow ugc">Google Privacy Policy</a> 
* <a href="https://policies.google.com/terms" rel="nofollow ugc">Google Terms of Service</a>
<h4>Google Cloud API Translation Mode</h4>
When using Google Cloud API mode, this plugin sends content to the Google Cloud Translation API for server-side translation.
What this service does: Provides server-side translation of your website content, enabling SEO-friendly translated URLs.
When data is sent: 
* When a visitor accesses a translated URL (e.g., <code>/fr/your-page/</code>), the page content is sent to Google for translation 
* When an administrator uses the “Translate All URLs” feature to bulk-translate URL slugs 
* Translations are cached locally to minimize API calls
What data is sent: 
* The text content of pages and posts being translated 
* URL slugs when using the URL translation feature 
* Your Google Cloud API key (for authentication)
What data is NOT sent: 
* Visitor IP addresses (translation happens on your server, not in the visitor’s browser) 
* Personal visitor information 
* User account data
Service provider: Google Cloud (Google LLC)
Links: 
* <a href="https://cloud.google.com/translate" rel="nofollow ugc">Google Cloud Translation API</a> 
* <a href="https://cloud.google.com/terms/cloud-privacy-notice" rel="nofollow ugc">Google Cloud Privacy Policy</a> 
* <a href="https://cloud.google.com/terms" rel="nofollow ugc">Google Cloud Terms of Service</a> 
* <a href="https://cloud.google.com/translate/pricing" rel="nofollow ugc">Google Cloud Translation API Pricing</a> (includes free tier)
<h4>Cookies</h4>
This plugin sets the following cookie:
<ul>
<li>googtrans – Stores the visitor’s selected language preference. This is a session cookie used by Google Translate to remember which language the visitor chose. No personal data is stored in this cookie.</li>
</ul>
<h4>Data Privacy</h4>
<ul>
<li>In Automatic mode, translation processing occurs on Google’s servers via the visitor’s browser</li>
<li>In Google Cloud API mode, translation processing occurs on Google’s servers but is initiated by your WordPress server, not the visitor’s browser</li>
<li>Translated content is cached in your WordPress database to improve performance and reduce external API calls</li>
<li>No visitor personal data is collected or stored by this plugin</li>
<li>No visitor tracking is performed by this plugin beyond the language preference cookie</li>
</ul>

Iris Translate

Translate your WordPress site with free automatic translation or SEO-friendly Google Cloud API translation.

leopolt

Using the power of Google, you can translate your WordPress powered site with no effort, and make it multilingual to everybody on the internet.
Features
<ul>
<li>100% free plugin</li>
<li>Show/hide Google top banner</li>
<li>Flags combined into one file</li>
<li>Google Analytics integration</li>
<li>Translates the site on the fly</li>
<li>Valid XHTML</li>
</ul>
You might want take a brief look at this premium translation plugins guide: <a href="https://wordpress.translate.guide" rel="nofollow ugc">https://wordpress.translate.guide</a>

Translate WordPress with Google Languages Translator

Simple and powerful Google Translator plugin. Use it with a shortcode or with a widget, and make your website multilingual and accessible to everybody …

Iris Translate vs Translate WordPress with Google Languages Translator