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Minimum Requirements
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an FTP client software will be required to upload the files (netinstall or full package): Piwigo team recommends FileZilla as FTP client software, because it is free as Piwigo is, and compatible with Windows, Mac and Linux.
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A web server like Nginx or Apache
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A graphic library: ImageMagick is recommended for its performances and image quality but GD, often bundled with PHP, can also do the job.
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MySQL 5.6+ or MariaDB 10.1+. MySQL 5.0 works but is no longer maintained.
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Enough disk space for your pictures: in addition to the photos you upload, Piwigo will store the "multiple sizes" in a cache directory of your server.
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PHP 7.4+. Piwigo can run with PHP 7.0+ but these end-of-life versions are no longer maintained and may expose your site to security vulnerabilities. See <a href="https://www.php.net/supported-versions.php" target="_blank">officially PHP supported versions</a>.
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Optional Requirements
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exiftool is required for plugin Write Metadata or any other plugin dealing with EXIF/IPTC metadata
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ffmpeg is required for plugin VideoJS to create video poster
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pdftoppm will be recommended to generate poster from PDF files (instead of ImageMagick)
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Piwigo requires a web hosting to run. For a photo gallery solution with all included (installation, hosting, backups), or if you simply want to try Piwigo with no installation, you may consider <a href="%s">opening a free trial account on Piwigo.com</a>.