How Do I Fill, Sign, and Submit PDF Forms on Mobile Devices?

The Foxit eSign mobile app lets you fill in form fields, apply a legally binding signature, and submit a completed PDF directly from your phone or tablet, without printing, scanning, or switching to a desktop. That full loop, fill, sign, submit, in one mobile session, is what most people are actually asking for. 

What “Fill, Sign, and Submit on Mobile” Requires 

A lot of mobile PDF tools can do one of these three steps well. Fewer handle all three in a way that’s fast and still legally sound. A complete mobile workflow needs to: 

• Let you type into form fields, not just view them, on a small screen 

• Apply a signature that’s actually legally binding, not just a drawn image 

• Send the completed document back to whoever requested it, without emailing a scanned copy 

• Work whether or not you have a reliable internet connection at the moment 

• Keep the same security and compliance standards as signing on a desktop 

How to Fill, Sign, and Submit PDF Forms With Foxit eSign Mobile 

Fill in the form. Open the document in the Foxit eSign mobile app on iOS or Android, and complete text fields, checkboxes, and other data entry fields directly on your device. If you’re starting from a paper form, you can take a picture of it to instantly convert it into a digital agreement, so you’re not stuck waiting for a scanner. 

Apply your signature. Sign your way: type your name and pick a style, draw your signature with a finger or stylus, or upload an image of your signature. For documents that need a firmer identity check, turn on two-factor authentication (2FA) or knowledge-based authentication (KBA) so only the intended signer can complete the form. Signatures applied through Foxit eSign meet ESIGN, UETA, and eIDAS legal and regulatory requirements, so they carry the same legal weight on mobile as they do on desktop. 

Submit without extra steps. Once a form is filled and signed, submit it directly from the app. There’s no need to print, scan, or email a separate copy: the completed document routes back through the same workflow it came from, and you can monitor its status alongside everything else you’ve sent or signed. 

Work offline when you need to. Offline mode lets you continue filling in and signing documents when there’s no internet connection, then syncs and sends automatically once you’re back online. That matters for field teams, in-person meetings, or anywhere connectivity isn’t guaranteed. 

Fill and submit self-serve forms too. Not every mobile form starts as a document someone sends you. Foxit eSign’s web forms can be published as a link or embedded form, so people can fill out and submit a signable form from a phone browser without installing anything. 

If you’re editing the PDF itself first. For forms that need edits beyond filling fields, like adding a clause or adjusting layout, Foxit PDF Editor’s mobile app handles that editing before the document moves into the eSign workflow for signing and submission. 

Why Mobile Matters More Than a Convenience Feature 

For a lot of roles, mobile isn’t a backup option to the desktop, it’s the primary way documents get handled. Field service technicians, sales reps, real estate agents, and traveling executives often don’t have a laptop open when a form needs to get done. A mobile fill-and-sign experience that’s slower or less capable than the desktop version just pushes the work back to whenever someone finds a computer, which defeats the point. The workflow only counts as solved when someone can complete a form, sign it, and send it back from wherever they actually are. 

Common Mobile Fill-and-Sign Scenarios 

• Signing a contract or NDA while away from the office 

• Completing new-hire paperwork from a phone during onboarding 

• A field technician filling out and submitting an inspection or service form on site 

• A real estate agent capturing a lease or disclosure signature during a showing 

• Approving a vendor form or policy acknowledgment sent while traveling 

Foxit eSign Mobile vs. Other Mobile Signing Apps 

Compared to DocuSign and PandaDoc, Foxit eSign Business includes unlimited envelopes and templates as standard, so mobile signing volume doesn’t run into per-envelope caps. Security and compliance protections, including 256-bit encryption, SOC 2 Type 2 compliance, and 2FA or MFA, apply the same way on mobile as they do on desktop, rather than being a scaled-down version of the full product. 

Foxit eSign is part of the broader Foxit ecosystem trusted by over 700 million users and 640,000+ companies worldwide, with a 4.6 out of 5 rating on G2 across more than 5,000 reviews. 

FAQ 

Can I fill out a PDF form on my phone with Foxit eSign? 

Yes. The Foxit eSign mobile app for iOS and Android lets you complete text fields, checkboxes, and other form data directly on your device. 

Is a signature applied on mobile legally binding? 

Yes. Signatures applied through the Foxit eSign mobile app meet ESIGN, UETA, and eIDAS legal and regulatory requirements, the same standards that apply on desktop. 

Can I sign and submit a document without an internet connection? 

Yes. Offline mode lets you fill in and sign documents without connectivity, then syncs and sends automatically once your device reconnects. 

Can I convert a paper form into a digital one from my phone? 

Yes. You can take a picture of a paper document to instantly convert it into a digital agreement ready for filling and signing. 

Ready to fill, sign, and submit your next PDF form from your phone? Download your Free Trial today!