How to Send a PDF for Signature by Email

You have a PDF that someone needs to sign, and you want the fastest way to get it back. Learning how to send a PDF for signature by email comes down to one choice: attach the file and ask the person to sign and return it, or send a signing link from an e-signature tool. Both start in the signer's inbox, but they lead to very different results. This guide walks through each method, shows what to write in the email, and covers the small details that keep documents from stalling.

Two ways to send a PDF for signature by email

When people say they want to email a PDF for signature, they usually mean one of these:

The attachment method. You attach the PDF to a regular email and ask the recipient to sign it and send it back. They print, sign and scan it, or they add a signature with a PDF app on their phone or computer.
The signing link method. You upload the PDF to an e-signature tool, enter the signer's email address and send. The signer gets an email with a link, opens the document in a browser and signs there. The finished copy comes back to you automatically.

Here's how they compare for a small business:

	Email attachment	Signing link
Setup for you	None	Upload the PDF and add the signer
Work for the signer	Find a way to sign, save and reply	Click, review, sign
Where signatures go	Wherever the signer puts them	On the fields you approved
Knowing where things stand	Wait and check your inbox	See status and send reminders
Several signers	Forward the file from person to person	Each signer gets their own link

The attachment method is fine for an occasional one-off with someone who's comfortable with PDF tools. If you send agreements to clients, tenants or new hires regularly, the signing link method saves a lot of back-and-forth.

How to email a PDF as an attachment for signature

If you go the attachment route, a little preparation makes it much more likely you'll get back a clean, complete document.

Finalize the PDF first. Make sure it's the final version, with names, dates and amounts filled in. Changing a document after someone signs it means starting over.
Mark where to sign. If the PDF doesn't have obvious signature lines, add a note in the email listing the page numbers that need a signature, initials or a date.
Name the file clearly. Something like "Service-Agreement-Smith-2026.pdf" is easier for both of you to find later than "scan0042.pdf".
Explain how to sign. Many people don't know their phone can sign a PDF. Link to simple instructions, such as our guides on signing a PDF on iPhone and signing a PDF on Android.
Ask for a PDF back, not a photo. Photos of printed pages are hard to read and hard to file.
Set a date. A clear "please return by Friday" gets faster results than "when you get a chance".

The main downside is that once you hit send, the process is out of your hands. You won't know whether the person opened it, got stuck or forgot about it until you follow up yourself.

How to send a PDF for signature by email with a signing link

With an e-signature tool, the email still lands in the signer's inbox, but it carries a link instead of a file they have to handle. Here's how it works with ReadyInk:

Upload your PDF. Sign in at app.readyink.ai and upload the document.
Add your signers. Enter the name and email address for each person who needs to sign.
Let AI place the fields. ReadyInk's AI places every field on the document, so you don't have to drag signature and date boxes onto each page.
Review before sending. Check the fields and the signer details, change anything you want, and only then send.
Track and remind. See where each document stands and send a reminder to anyone who hasn't signed yet.

Signers don't need an account. They open the email, click the link, review the document and sign. You can also send copies to extra recipients, such as a business partner or your bookkeeper. For a broader overview, see our page on how to send documents for signature.

What it costs

ReadyInk uses tokens. One token covers one signer on one document, so a contract with two signers uses two tokens. Packs start at $10 for 20 tokens, and the Volume pack is $100 for 400 tokens, or $0.25 each. Purchased tokens never expire. Reminders and copies to extra recipients don't use tokens, and failed sends are refunded. If you only need to sign something yourself, Just me free self-signing costs nothing. Teams can use the Team plan at $15/month for 3 users with 30 shared monthly tokens. See e-signature for small business for details.

What to write in a signature request email

Whichever method you use, the email itself matters. A short, specific message gets signed faster than a vague one. A good request covers what the document is, what you need, and by when.

Subject: Please sign: Service agreement for Smith Landscaping

Hi Dana,

Here's the service agreement we discussed on Tuesday. It covers the spring cleanup and monthly mowing through October. Please review and sign by Friday, May 15. It should take about two minutes, and you can sign on your phone.

If anything looks off, just reply and I'll fix it before you sign.

Thanks, Chris

A few tips:

Use a clear subject line. Start with "Please sign" so it stands out in a crowded inbox.
Remind them what it's about. One sentence of context prevents "what is this?" replies.
Tell them what to expect. If you're using a signing link, mention that the document opens in the browser and doesn't come as an attachment. Unexpected links make some people hesitate.
Keep it short. Put the details in the document, not the email.

Common mistakes to avoid

Sending a draft. Double-check names, dates and amounts before sending. Fixing them later means a new round of signatures.
Forgetting a signer. If a spouse, co-owner or second party needs to sign, include them from the start.
Using the wrong email address. A typo sends your document nowhere. Confirm addresses, especially for new clients.
Not following up. Many unsigned documents are simply forgotten. A polite reminder after a day or two usually does it.
Re-creating the same document every time. If you send the same agreement often, turn it into a template. ReadyInk templates keep signer roles, fields and intake questions ready for the next send.

Whether a particular signing method is right for a specific contract depends on the document and where you are. If that matters for your situation, check with your attorney.

Frequently asked questions

Can I just attach a PDF to an email and ask someone to sign it?

Yes. It works for occasional documents, but the signer has to figure out how to sign and return the file, and you have no visibility until it comes back. A signing link is easier for the signer and lets you track progress.

Does the person signing need an account?

Not with ReadyInk. Signers open the link in your email, review the document and sign in their browser without creating an account.

How do I send one PDF to several people for signature?

With the attachment method, you forward the file from one person to the next and hope nobody signs an old copy. With ReadyInk, you add each signer's email address and each person gets their own link. Each signer uses one token.

Emailing a PDF for signature doesn't have to mean chasing attachments and blurry scans. Upload your document, let AI place the fields, review it, and send a signing link your clients can complete from any device. Send your next PDF with ReadyInk.