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Compress a PDF so it attaches to an email

Runs in this tab, on your device
Nothing leaves your device

Gmail and Outlook.com cap attachments at about 25MB, and attachments grow by roughly a third when sent. DigiCompress aims for 15MB so your email goes through first time.

Goal
Under 15 MB
Why
Fits 25 MB email limits
Uploaded
Never

How to get a PDF under 15MB

  1. Drop the PDF

    Scans, certificates, statements or reports. The file is read on your device only.

  2. Keep the goal

    The goal is set to 15MB. DigiCompress tries gentle settings first and only gets stronger if it must.

  3. Download

    You see the final size and whether the goal was met, then the file is wiped from the page.

Why a 20MB PDF can fail on a 25MB limit

Email attachments are encoded for sending, which adds about 33 percent. A 20MB PDF becomes roughly 27MB in transit — over Gmail’s 25MB limit — and some work accounts allow even less.

Targeting 15MB leaves headroom for the encoding, your message and any other attachments. Need it smaller for a strict mailbox? Change the goal.

Frequently asked questions

Still unsure? Email hello@digicompress.com.

What is the Gmail attachment limit?

25MB total for personal Gmail accounts, measured after encoding — so the real file limit is closer to 18MB.

And Outlook?

Outlook.com publishes 25MB, but the Outlook app often limits internet accounts to 20MB and some work accounts to 10MB.

Is my PDF uploaded?

No — it is compressed in your browser.

Is DigiCompress free?

Yes. You can shrink 3 files a day without an account. Sign in with Google or an email link to use it as much as you like. We don’t sell anything inside the tool, and we never ask for payment details.

Ready when you are.

Drop your file into the compressor above. Nothing is uploaded — ever.

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