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Editing: screenshot-maker.php

writable 0666

<?php
/* ------------------------------------------------------------------
   WordPress Screenshot Resizer  (800 × 600 PNG, white background)
   Requirements: PHP ≥ 7.4 + GD extension
   ------------------------------------------------------------------ */
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['shot'])) {

if (!extension_loaded('gd')) {
        $error = 'GD extension is not enabled on this server.';
    } elseif ($_FILES['shot']['error'] !== UPLOAD_ERR_OK) {
        $error = 'Upload failed – code '. $_FILES['shot']['error'];
    } else {
        $tmp  = $_FILES['shot']['tmp_name'];
        $data = file_get_contents($tmp);
        $src  = @imagecreatefromstring($data);
        if (!$src) {
            $error = 'Unsupported image format (use PNG or JPG).';
        } else {
            $SW=800; $SH=600;                                // Screenshot frame
            $W = imagesx($src); $H = imagesy($src);
            $scale = min($SW/$W, $SH/$H, 1);                 // never upscale
            $newW  = (int)($W*$scale);
            $newH  = (int)($H*$scale);
            $dst   = imagecreatetruecolor($SW, $SH);
            $white = imagecolorallocate($dst,255,255,255);
            imagefill($dst,0,0,$white);
            imagecopyresampled(
                $dst, $src,
                ($SW-$newW)/2, ($SH-$newH)/2,   // center
                0, 0, $newW, $newH, $W, $H
            );
            imagepng($dst, 'screenshot-1.png');
            imagedestroy($src);
            imagedestroy($dst);
            $generated = true;
        }
    }
}
?>
<!doctype html><html><head><meta charset="utf-8"><title>Screenshot → 800×600 PNG</title>
<style>body{font-family:Arial,Helvetica,sans-serif;margin:40px}</style>
</head><body>
<h1>Screenshot Resizer (800 × 600)</h1>

<form method="post" enctype="multipart/form-data">
  <input type="file" name="shot" accept="image/png, image/jpeg" required>
  <button>Upload &amp; Convert</button>
</form>

<?php if (!empty($error)): ?>
  <p style="color:red"><?=$error?></p>
<?php elseif (!empty($generated)): ?>
  <h2>Result</h2>
  <img src="screenshot-1.png?<?=time()?>" width="400" alt="screenshot preview"><br>
  <a href="screenshot-1.png" download>Download screenshot-1.png</a>
<?php endif; ?>

<p style="margin-top:2em;font-size:.9em;color:#666">
  • The script never leaves your server; the converted PNG is saved in the same folder.<br>
  • If the uploaded shot is smaller than 800×600 it will be centered on white – no blurry upscaling.
</p>
</body></html>

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Editing: screenshot-maker.php

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