Compress PDF to 3 MB
3 MB is the size for documents that travel by email inside and between companies: small enough that two attachments clear a mail server's default limit, large enough that a report's photos and charts stay sharp. The target is set; upload and download.
Compress PDF
or drop PDF files here ·
Max 95 MB per file· Up to 20 files· Deleted after 30 minutes
Files are processed on our servers and deleted after 30 minutes.
Images above this DPI are downsampled. 150 is sharp on screen and fine for office printing; 72 is screen-only.
JPEG quality for re-compressed images. 70 keeps scanned text readable; below 40 artefacts appear around letters.
When aiming for a target size, image quality never drops below this; resolution is reduced instead.
How to use this tool
- 1
Upload the report or deck
Add the PDF exported from PowerPoint, Word, Keynote or a scanner. Up to 20 files can go in one batch, each up to 95 MB.
- 2
Keep 3 MB
Target size is 3 with the unit set to MB. To send three files in one email, lower each to 2.
- 3
Compress and attach
Press Compress, download the result and attach it; open it once to check the pages with photos.
How do I get a PDF down to 3 MB for email?
Upload it here and press Compress; the target is already 3 MB. Images inside the PDF are re-encoded until the file fits, while text and charts stay as they are.
Compress a PDF to 3 MB for business email
Personal email accounts allow large attachments, but documents at work pass through company mail servers too, and those are configured by administrators. Microsoft Exchange Server 2016 and 2019 ship with a default message size limit of 10 MB, while Microsoft 365 mailboxes default to 35 MB for sending. A PDF that leaves your Gmail account without a problem can still bounce at a client's on-premises server, or be stripped by a gateway that scans every attachment.
3 MB fits the arithmetic. Encoding adds about a third, so the file uses roughly 4 MB of the message; two such files and a signature with a logo still stay under 10 MB. It is also a size most phones open quickly from a mail preview, which matters when the recipient reads on the train.
Mail limits a 3 MB PDF clears
- message space a 3 MB attachment uses after encoding
- ~4 MB
- default message limit in Exchange Server 2016 and 2019
- 10 MB
- Outlook.com attachment limit
- 20 MB
- default send limit for Microsoft 365 mailboxes
- 35 MB
Target size, Recommended or Extreme for a 3 MB PDF
Target size: 3 MB
Compresses only as far as needed to get under 3 MB.
- Keeps the most image quality that fits
- Predictable result for email
- Same target for every file in a batch
Recommended
Shrinks most PDFs by 40–70% with no visible change.
- No target to choose
- Gentle on photos
- Result size varies by file
Extreme
Drops images to screen resolution.
- Largest saving
- Visible softening on photos
- Not meant for printing
A 3 MB target is gentle for most office documents. A 40-page report with a dozen photos, exported from Word at print quality, usually reaches it by downsampling images from 300 DPI or more to about 150–200 DPI, with JPEG quality staying high. Long color scans are different: a 150-page scanned contract may only reach 3 MB in grayscale, and a scanned photo album may not reach it at all without visible loss.
If you are building the PDF yourself, export at a screen or standard quality setting and the compressor has less to remove. The compress PDF page explains every mode and clean-up option in detail.
3 MB PDF questions
Why does a 3 MB PDF count as about 4 MB in an email?
Attachments are encoded as text for transport, which adds about a third. A 3 MB PDF uses roughly 4 MB of the message size limit, so two of them use about 8 MB of a 10 MB allowance.
Will a slide deck exported to PDF look worse at 3 MB?
Usually not on screen. PowerPoint exports often embed photos at full camera resolution; at 3 MB those images typically settle near 150–200 DPI, which is sharper than a projector or laptop display can show. Text, shapes and charts drawn in PowerPoint are vectors and are not changed.
My recipient's mail server bounced a 7 MB PDF. Is 3 MB enough?
In most cases, yes. On-premises Exchange servers default to a 10 MB message limit and many administrators set lower ones, so a bounce at 7 MB suggests a cap near 5–10 MB. A 3 MB file, about 4 MB once encoded, fits under both.
What if the PDF cannot reach 3 MB without blurring?
That points to a long scan or a photo book. Turn on Convert to grayscale for text pages, or send the document in parts. For a hard upload limit rather than email, compress PDF to 2 MB or a custom target may suit better.
Should I zip a PDF before emailing it?
It rarely helps. A PDF's images and text streams are already compressed, so a ZIP of a PDF is usually only a few percent smaller. Compressing the PDF itself saves far more.
Can I compress a PDF to 3 MB on an iPhone?
Yes. Open this page in Safari, tap the upload area, pick the PDF from Files, then download the result back to Files or share it straight to Mail.
