How to make a PDF smaller for email and upload forms

A big PDF takes long to send, eats the recipient’s data and sometimes doesn’t go through at all: the email bounces the attachment, or the upload form says the file is too large. This guide shows how to shrink a PDF in your browser, without sending the document to anyone’s server.

First: why is the PDF big?

• Pages that are photos. A scanned or phone-photographed document carries one image per page. It’s the most common case, and the one that shrinks the most.
• Large photos inside the document. A report with full-size phone photos pasted in.
• Too many pages. Sometimes the file is big because it has pages that don’t need to go.

A text-only PDF exported straight from Word or Google Docs is usually light already. Compressing it helps little.

Step by step

1. Open compress PDF and tap Choose PDF.
2. Keep Light mode and tap Compress PDF.
3. Check the size before and after. If it fits the limit, tap Download PDF.
4. If it’s still too big, choose the PDF again, switch to Strong and compress again.

Light or strong

Light shrinks the photos inside the PDF and keeps text as text: the recipient can still select, copy and search it. Always try it first.

Strong turns each page into an image. The file gets much smaller, especially for scans, but the text can no longer be selected, and links and form fields stop working. For an ID, a receipt or a report the other person will only read, it’s usually the right call.

If the compressed file isn’t smaller, the tool gives you the original and tells you. It never hands back a larger PDF.

Email

Every email service has an attachment limit, and the recipient’s limit counts too. Gmail, for example, accepts attachments up to 25 MB. Above the limit, the email turns into a cloud link, and some recipients can’t open it. With a compressed PDF, the attachment goes straight through.

Chat apps

Chat apps send a PDF as a document, without changing the file. A light PDF arrives faster and opens better on the recipient’s phone, especially on mobile data. For chats and groups, strong mode is almost always enough.

Tip: send it as a Document, not as a photo. That way the PDF arrives whole, with every page.

Upload forms

Government portals, schools and employers often cap the file size, and the limit usually shows next to the upload button (something like “PDF up to X MB”). Read it first, then:

1. compress in light mode;
2. if it doesn’t fit, use strong. A scanned personal document stays readable;
3. if it still doesn’t fit, split the document into parts with split PDF and upload each part in the right field, if the form allows it.

Before sending, open the compressed PDF and check that every page is readable. A document no one can read may delay your application.

Still too big?

• Remove pages that don’t need to go, like blank ones, with organize PDF.
• Rebuild the PDF from the photos with JPG to PDF: it already shrinks each photo.
• Split it into parts with split PDF.

Your document stays with you

Compression happens in your browser, in your phone’s or computer’s memory. The PDF isn’t sent to our server, and closing the page clears everything. For bank statements, pay stubs and IDs, that makes a difference.