eSign for iPhone Review: The Best Way to Sign PDFs on Mobile

Apple's built-in Markup tool can put a signature image on a PDF. It works, and for a one-off signature on a simple document, it's perfectly adequate — we said as much in our guide on signing PDFs without printing. But Markup wasn't designed around a signing workflow. It doesn't manage your signature styles, handle multi-field documents cleanly, guide you through initials and date fields, or make the experience feel professional. For people who sign documents regularly — whether you're a freelancer, a real estate agent, a field sales rep, or anyone who handles contracts on the go — a dedicated signing app changes the experience meaningfully. eSign is the app most consistently recommended for this on iOS.

What eSign Is (and Isn't)

eSign is a dedicated PDF signing app for iPhone and iPad. Its scope is intentionally focused: it's built to make signing PDF documents on iOS as fast and polished as possible. It is not a full PDF editor — it won't let you edit body text, create forms, or batch process files. If you need those capabilities, a desktop tool like Wondershare PDFelement or UPDF is more appropriate. But for signing? eSign is purpose-built in a way that general PDF editors simply aren't.

The Signing Workflow

The core workflow in eSign is straightforward and well-designed:

1. Import the document — from Files, email, iCloud, Dropbox, or any share sheet. eSign integrates with iOS sharing so you can open a PDF directly from Mail or Safari into the app in one tap.
2. The app identifies signature fields — if the PDF has embedded signature fields (see our guide on adding signature fields), eSign highlights them automatically. If the PDF is a flat document with only a printed signature line, you can place your signature manually.
3. Sign with your stored signature — eSign stores your signatures and initials so you don't redraw them every time. Your first-use setup involves drawing your signature once; from then on it's a single tap to place it.
4. Fill other fields — date, printed name, initials, and other text fields can be completed in the same session before the signature goes on.
5. Share the signed document — via email, AirDrop, Files, or any iOS share sheet. The signed PDF is a standard file that opens in any PDF viewer.

What Makes It Better Than iOS Markup for Regular Signers

Who eSign Is Right For

eSign hits a specific sweet spot. It's the right tool if:

• You sign documents more than occasionally — a few times a week or more. At that frequency, the workflow improvements over Markup add up to real time savings.
• You work primarily from iPhone or iPad — eSign is an iOS-native experience. If you're mostly at a desktop, a browser tool or desktop application may be more convenient.
• You handle multi-field documents — contracts with signature + initials + date + printed name fields across multiple pages are significantly more manageable in eSign than in Markup.
• Professional presentation matters — if you're sending signed contracts to clients, the quality and consistency of the output reflects on you.
• You're a freelancer, real estate professional, field sales rep, or property manager — these are the use cases eSign is most commonly used for, and where the mobile-first workflow is genuinely advantageous over desktop tools.

Who Should Probably Use Something Else

• Occasional signers — if you sign a document once a month, iOS Markup handles it without any additional app needed. Our free signing guide covers all the built-in options.
• Users who need to request signatures from others — eSign is for signing documents yourself. If you need to send a document out for someone else to sign and track their response, a full e-signature platform (DocuSign, Dropbox Sign) is the right tool.
• Android users — eSign is iOS only. Android users should look at Adobe Acrobat Reader's free tier or a browser-based signing workflow.
• Users who need PDF editing alongside signing — if you need to edit text, create forms, or process PDFs beyond signing, a full desktop PDF editor gives you everything in one place.

eSign in Context: The Broader Signing Toolkit

The right signing tool depends on who's signing, what device they're on, and how complex the document is. Here's how eSign fits alongside the other options:

The Bottom Line

eSign does one thing — mobile PDF signing on iOS — and does it better than anything else in that category. It's not trying to be a full PDF editor or a multi-party e-signature platform, and that focus is exactly what makes it good. The stored signatures, field-guided workflow, and clean iOS integration remove the friction from a task that most people dread, and turn it into something that takes 30 seconds instead of 5 minutes.

If you sign documents on iPhone or iPad with any regularity, eSign is worth trying. The free tier is functional enough to evaluate whether it fits your workflow before committing.