Quick start

Copy one script tag and one attribute: files that are too big are reduced in the visitor’s browser before upload, with no change to your upload code.

This page sets up the upload helper. To put a whole tool on your page instead, see Embed a tool.

Add the script
Paste it once per page, anywhere, for example just before </body>.
HTML
```
<script src="https://pdfkind.com/embed.js" defer></script>
```
Set the size limit on your upload field
Use the same limit your server checks. Put the attribute on the file input, or on a drag-and-drop area.
HTML
```
<input type="file" name="diploma" data-pdfkind-max="5MB">
```
Credit PDFkind
Add a short visible line near the field. It’s free to use; this link is all we ask.
HTML
```
<p>Large files are reduced in your browser by <a href="https://pdfkind.com/compress-pdf">PDFkind</a>.</p>
```
Try it
Pick a PDF or photo bigger than your limit. A small window shows “Reducing your file…”, then your form receives the smaller file. Your existing upload code doesn’t change.

Tip. Using WordPress or a form builder where you can’t add attributes to fields? Put the limit on the script instead: <script src="https://pdfkind.com/embed.js" data-max="5MB" defer></script>. See WordPress & form builders.

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Last updated November 3, 2026 · Questions: contact@pdfkind.com