Should You Send Your Pitch Deck as PDF or PPTX?

The short answer

If an investor, accelerator or competition tells you which format to use, use it. Everything below is for the many situations where nobody says.

In those cases, most founders are well served by sending a PDF first. A deck's job at that stage is to be read, often quickly and often on a phone between meetings. The PDF format exists to make a document look the same everywhere, and that is exactly what you want. PPTX comes into its own later, when someone wants to present your slides, lift a chart into an investment memo, or work on the deck with you.

Comparing the two formats

The two quiet risks with PPTX are fonts and notes. If you used a brand font the reader does not have, PowerPoint swaps it for something else and your carefully balanced headlines may wrap or overflow. And speaker notes travel with the file, including reminders you wrote only for yourself.

Fonts and layout: why decks break

A deck that looks perfect on your laptop can look clumsy elsewhere for reasons that have nothing to do with your content.

• Missing fonts are replaced with a default, changing line lengths and spacing.
• Different apps render shadows, gradients, SmartArt and some chart styles differently.
• Slide size differences, such as 16:9 versus 4:3, can add borders or squash content when imported elsewhere.
• Linked rather than embedded charts or images can appear as broken placeholders.

Exporting to PDF freezes all of this. PowerPoint to PDF converts the deck in your browser; for tips on getting a faithful result, see PowerPoint to PDF without losing your slides. Always open the PDF afterwards and click through every slide, because what you check is what the investor sees.

File size and how you deliver the deck

A deck should feel light to receive. Large attachments can be rejected by mail servers or quietly dropped into a promotions or spam folder, and portals often cap uploads. Limits vary, so check the specific one you face.

• For a PDF, Compress PDF usually makes a big difference with little visible change, and its lossless level is there if you want no change at all to images. If a portal names an exact limit, Target-size PDF aims for it directly.
• For a PPTX, Compress PowerPoint shrinks photos and screenshots while keeping animations and notes. See how to compress a pitch deck for the full walk-through.

Many founders send a link rather than an attachment, using a document-sharing service that shows when and how long the deck was viewed. That can be useful, but weigh the trade-offs: some readers prefer a plain attachment they can save and read offline, links can be blocked by corporate filters, and email gates or forced sign-ups add friction. A reasonable middle ground is a link with no sign-up required, or a link plus a small PDF attached for convenience.

TipIf you are sharing an early or sensitive deck widely, a light, visible watermark such as 'Confidential, prepared for Fund Name' reminds readers it is not for forwarding, without getting in the way of reading.

When PPTX is the right choice

There are good reasons to send the editable file.

• An investor or partner asks for it, perhaps to present your company to their partnership.
• A programme or demo day requires you to submit slides that will be run from their machine.
• You are collaborating with an advisor or co-founder on the content.
• Your story depends on animation or an embedded demo video.

In those cases, save a separate sending copy: remove private speaker notes, hidden backup slides and comments, check that fonts are embedded (in PowerPoint, File, Options, Save, 'Embed fonts in the file') or swap brand fonts for common ones, and compress the images.

Watch outComments, tracked edits and speaker notes in a PPTX are easy to forget and easy for the recipient to read. Check the Review tab and the Notes pane before sending.

A pre-send checklist

Whichever format you choose, run through this before you press send.

1. File name. Use something clear and specific, such as CompanyName_Seed_Deck_Oct2026.pdf. Avoid names like final_v7_REAL.pptx.
2. Size. Confirm the file is comfortably under the email or portal limit.
3. Page count. Check every slide is present and none of your hidden or appendix slides slipped in by mistake.
4. Metadata. Look at the document properties (title, author, company). Old template names, a previous employer or a former working title can show up here. Fix them in PowerPoint before exporting.
5. Links. Click every link in the exported file, including your demo, website and calendar booking link.
6. Numbers. Make sure the metrics in the deck match what you have said in your email and any data room.
7. Phone test. Open the file on your own phone. If it is hard to read there, it is hard to read for many investors.
8. Contact details. Put your name, email and phone on the last slide, so the deck still works if it is forwarded without your email.

If the deck contains information you only want certain people to read, such as detailed financials, you can password-protect the PDF, though for an introductory deck that extra step may cost you readers. Use judgement about what the deck really needs to include at this stage.