Welcome to Dagon Design. In addition to free scripts, WordPress plugins, and articles, we offer a variety of services including custom theme design, plugin creation, and PHP scripting. Contact me for more information.

Updated Sunday, February 22nd, 2009 at 8:20pm

Change Default Thumbnail Size in WordPress

WordPress 2.5 and later include a built-in option to change the size of thumbnails, but for those of you out there using an older version, it is quiet easy to change. It just requires modification of one WordPress file. When WordPress 2.1 was released, it changed the way this was done, and once again with the release of WordPress 2.3, so I have included instructions below for multiple versions.

Instructions for:

  If you have found this page useful, please consider donating. Thanks!


WordPress 2.0

Open /wp-admin/inline-uploading.php and look for the following code:

if ( $imagedata['width'] > 128 && 
$imagedata['width'] >= $imagedata['height'] * 4 / 3 )
      $thumb = wp_create_thumbnail($file, 128);
    elseif ( $imagedata['height'] > 96 )
      $thumb = wp_create_thumbnail($file, 96);

The default max size is 128 x 96. You can change these numbers to whatever you like, although you must keep the proper aspect ratio (4 / 3).

For example, to double the size of the thumbnails, replace 128 with 256, and 96 with 192. Be sure to change both sets of numbers – they are each listed in the code twice.


WordPress 2.1 – 2.2

Open /wp-admin/admin-functions.php and look for the following code:

$max_side = apply_filters( 'wp_thumbnail_max_side_length', 
128, $attachment_id, $file );

The number specified here (128 by default) is the maximum size of either dimension. Just change this to whatever you like.


WordPress 2.3

Open /wp-admin/includes/image.php and look for the following code:

$max_side = apply_filters( 'wp_thumbnail_max_side_length', 
128, $attachment_id, $file );

The number specified here (128 by default) is the maximum size of either dimension. Just change this to whatever you like.

WordPress 2.5 and later

Version 2.5 and later have built-in support for the thumbnail size in the options.

  If you have found this page useful, please consider donating. Thanks!

Pages: [12] 11 10 9 8 7 6 5 4 3 21 » Show All

  1. saya suka dengan judul Change Default Thumbnail Size in WordPress .

  2. please read through the comments because most common issues have already been discussed many times

  3. Bu sehir arkandan gelecek sevenlerine verilen onemli mesajlar icin fan sitesine uygulamak zorunda kaldgimiz guzelliklerini edinmek adina ugrayabilirsiniz. Bu sehir arkandan gelecek izle yeni bolum fragmanlari yer alacagi topluluktur.

  4. Eminizki kaliteden odun vermeyecek olan dayan yuregim kadrosu geregi sizinle bulusmayi o kadar fazla istemektedirler anlatamayiz. Dayan yuregim izle hayralarinin guzel olusunun sebebi cansel elcin, gibi isimlerin basrolde yer almasindan kaynaklidir.

  5. Son zamanlarin guzelligine doyum olmayacaginden dolayi sizlere ozel sunum gerceklestirdigimiz yildizlar sahidim bulusmanin sabirsizlandigi kismini yasamaktayiz. Yildizlar sahidim dizisi kadrosunun ayrica onurlu kismindan mesajlar verlmektedir.

  6. icimdeki firtina dizisi sevenleriyle bulusmadan once oyuncu kadrosunun dikkatlarini uzerine toplayarak yusuf cim, merve bolugur gibi birbirlerine uyum saglayacak kisiler ozenle secilmistir. icimdeki firtina izlemek adina buyrun beklemekteyiz.

  7. Adi Efsane dizisi seyirciyle bulusacagi an merakla beklenmektedir, sevenleriyle gorusme zamani olarak ocak sonlari belirlenmistir. Ustelik bu zaman zarfinda sadece kalmasiyla degil, karisina cikacagi tehlikelerle yuzlesidir. Adi efsane her zaman izleyebilirsiniz.

  8. Engin Akyürek ve Fahriye Evcen’nin ba?rollerinde oldu?u Ölene Kadar, kadrosuyla ilgi çekmeyi ba?ard?. Ba?rollerin yan? s?ra, Rag?p Sava?, Gülcan Arslan ve Taner Turan, gibi isimlerin bulundu?u Ölene Kadar ?zle, dev kadrosuyla reytingleri alt üst etmeye geliyor. Tims

  9. Bu sehir arkandan gelecek sevenlerine verilen onemli mesajlar icin fan sitesine uygulamak zorunda kaldgimiz guzelliklerini edinmek adina ugrayabilirsiniz. Bu sehir arkandan gelecek izle yeni bolum fragmanlari yer alacagi topluluktur.

  10. om telolet oommm

Pages: [12] 11 10 9 8 7 6 5 4 3 21 » Show All

Leave a Comment

Before you comment: If you are having an issue with a script, please make sure you have read the entire article. Also, please read through the comments because most common issues have already been discussed many times. Thanks.


Be sure to wrap all code in <code></code> tags.