The 5 Best PDF Signing Apps for iPhone (2026)
You need to sign a document. Here's which app to use.
Short answer
For personal signing on iPhone, eSign PDF offers the best balance of privacy, features, and price. DocuSign is only worth it if you send documents for others to sign. Adobe is bloated, Signeasy has privacy concerns, and Apple Markup breaks on multi-page PDFs.
Last updated 2026-04-18
Most people don't need DocuSign. They need to sign one PDF and send it back. We tested every signing app on iPhone for speed, privacy, features, and price. We built eSign PDF, so we're upfront about our bias — but we've included honest pros and cons for every option.
1. eSign PDF
Fast, private, offline signing
eSign PDF does one thing well: sign and fill PDFs on your iPhone. 100% on-device processing means your documents never leave your phone. No account, no internet required. Four pen styles with Apple Pencil support, AI field detection, and tamper-proof export. Built for people who sign 1-10 documents a month and don't need enterprise workflows.
Pros
- ✓ 100% on-device — documents never uploaded to any server
- ✓ No account needed, works offline
- ✓ Best signature quality (4 pen styles, Apple Pencil support)
- ✓ AI detects signature and date fields automatically
- ✓ Tamper-proof flattened PDF export included
Cons
- ✕ Self-signing only — can't send for others to sign
- ✕ iOS only (no Android or web)
- ✕ No free tier (starts at $2.99/week)
2. DocuSign
Enterprise e-signature platform
DocuSign is the industry standard for businesses. Multi-party signing, document routing, audit trails, and compliance certifications. If you send documents for others to sign and need tracking, DocuSign is the right tool. But for personal signing, it's expensive overkill.
Pros
- ✓ Multi-party signing with tracking and reminders
- ✓ Legally certified with full audit trails
- ✓ Integrates with 400+ business tools
- ✓ Works on every platform
Cons
- ✕ Starts at $15/month ($180/year) for personal use
- ✕ Requires account and internet connection
- ✕ Documents stored on DocuSign's servers
- ✕ Mobile app feels like a companion, not standalone
3. Adobe Fill & Sign
Part of the Adobe ecosystem
Adobe's signing app comes free with basic features but pushes you toward Acrobat Pro ($19.99/mo) for advanced tools. At 470MB, it's one of the largest apps on the App Store. Decent if you're already in the Adobe ecosystem, but bloated for occasional signing.
Pros
- ✓ Free basic signing
- ✓ Integration with Adobe Document Cloud
- ✓ Well-known brand
Cons
- ✕ 470MB+ app size
- ✕ No Apple Pencil support
- ✕ Collects usage data
- ✕ Tamper-proof export requires Acrobat Pro ($19.99/mo)
4. Signeasy
Polished signing with send-to-sign
Signeasy has a clean interface and supports both self-signing and sending documents for others to sign. However, it was caught downloading user contacts without permission and has a 100-day cancellation policy. Good features, questionable privacy track record.
Pros
- ✓ Clean, polished interface
- ✓ Send-to-sign with tracking
- ✓ Good template system for repeated documents
Cons
- ✕ Downloaded user contacts without clear permission
- ✕ 100-day advance cancellation notice required
- ✕ Documents uploaded to Signeasy servers
- ✕ Starts at $6.99/month
5. Apple Markup
Built into iOS, free
Apple Markup is built into every iPhone — no download needed. Open a PDF, tap the markup icon, sign. It works for basic signing but has real limitations: signatures on multi-page PDFs can disappear, no date/checkbox tools, and signatures aren't flattened (anyone can remove them with a PDF editor).
Pros
- ✓ Free, built into iOS
- ✓ No app to download
- ✓ 100% on-device processing
Cons
- ✕ Known bug: signatures disappear on multi-page PDFs
- ✕ Can't add dates, checkboxes, or stamps
- ✕ Signatures not flattened (can be removed by recipient)
- ✕ No AI field detection
- ✕ No Apple Pencil palm rejection
The verdict
For personal signing on iPhone, eSign PDF offers the best balance of privacy, features, and price. DocuSign is only worth it if you send documents for others to sign. Adobe is bloated, Signeasy has privacy concerns, and Apple Markup breaks on multi-page PDFs. If you sign 1-10 documents a month, eSign PDF at $19.99/year is the clear winner.
Frequently asked questions
Is Apple Markup good enough for signing PDFs?
For signing a single-page document, it works in a pinch. But it can't add dates, breaks on multi-page PDFs, and doesn't flatten signatures (so they can be removed). For anything important, use a dedicated signing app.
Do I need DocuSign as an individual?
Probably not. DocuSign is built for businesses sending documents for others to sign. If you're the one signing (freelancer, renter, parent), eSign PDF or even Signeasy is more appropriate and much cheaper.
Are electronic signatures legally valid?
Yes. Electronic signatures are legally binding under the ESIGN Act (US), eIDAS (EU), and equivalent laws in most countries. All apps on this list produce legally valid signatures.
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Alternative
DocuSign Alternative
Looking for a DocuSign alternative? eSign PDF lets you sign and fill documents on iPhone for $19.99/year instead of $180/year. 100% offline, no account needed.
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Adobe Sign Alternative
Adobe Fill & Sign is 470MB and collects your data. eSign PDF is under 50MB, 100% private, with Apple Pencil support Adobe lacks. A better alternative.
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