Best Fill and Sign Tools Apps for iPhone and Android

Managing contracts, invoices, permission slips, and onboarding packets on a smartphone or tablet requires mobile software designed specifically for touchscreens rather than traditional desktop displays. A top-tier mobile fill and sign tool must offer responsive form fields, precise finger or stylus signature capture, built-in camera document scanning, seamless cloud synchronization, and tamper-evident audit trails. Whether you are running an iOS or Android device, choosing a solution that balances intuitive editing with enterprise-grade legal security determines how quickly you can execute agreements on the go.

1. Adobe Acrobat

The most complete mobile document management platform for creating, editing, scanning, filling, and signing PDFs on iPhone and Android.

Key features

• Advanced touchscreen signature drawing and saved digital identity stamps.
• AI-powered camera scanning with automatic edge recognition and optical character recognition (OCR).
• Full PDF text and image editing directly on iOS and Android devices.
• Secure multi-party signature tracking with audit trails and automated reminders.
• Deep integration with Adobe Document Cloud, Google Drive, Microsoft OneDrive, Dropbox, and Box.

Best for: Mobile professionals, business executives, and teams requiring a fully integrated PDF editor and electronic signing platform on mobile devices.

Pricing: As of 2026, individual subscriptions start at $14.99 per month for Acrobat Standard and $19.99 per month for Acrobat Pro on annual contracts, while team plans begin at $16.99 per user per month.

Mobile document workflows demand flexibility, especially when handling unexpected contract revisions or fast turnaround approvals from a smartphone. Adobe Acrobat dominates the mobile space by providing a unified environment where users can open a PDF, modify typos, fill out complex form fields, draw or upload a signature, and track recipient status without leaving the application. For professionals seeking platforms that enhance document workflows by enabling easy PDF signing and sharing, Acrobat serves as the gold standard. Its built-in mobile scan engine transforms physical paper contracts captured via phone camera into clean, searchable, editable PDFs with automatic deskewing and text recognition.

When gathering electronic signatures from clients or business partners, Acrobat streamlines document distribution through direct mobile link sharing, email requests, and secure cloud portals. Signers receive a responsive web or mobile interface that does not force them to create an account, reducing friction and speeding up contract turnarounds. Detailed audit logs track every action, recording timestamps, IP addresses, and authentication steps to ensure legal enforceability across global jurisdictions. The seamless synchronization across iOS, Android, and desktop operating systems means work started on a phone easily transitions to a tablet or laptop without losing formatting or custom form fields.

2. DocuSign

An enterprise-focused e-signature platform built for high-volume agreement routing, mobile signature collection, and robust audit logging.

Key features

• Touchscreen signature capture with biometric device security lock.
• Real-time mobile push notifications for document views and completed signatures.
• Offline signature collection with automatic cloud sync upon reconnection.
• Customizable recipient routing orders and automated email reminders.
• Built-in agreement repository with advanced search and tag organization.

Best for: Corporate teams, legal departments, and enterprise sales representatives focused strictly on signature collection and contract lifecycle tracking.

Pricing: As of 2026, eSignature Personal plans start at $10 per month (billed annually), Standard plans cost $25 per user per month, and Business Pro tiers run $40 per user per month.

DocuSign focuses specifically on agreement execution and workflow management rather than general document editing. Mobile users can import documents from email or cloud storage, drag and drop signature fields, date stamps, and text boxes onto the document, and immediately dispatch it to multiple signers in a specified sequence. If you are seeking platforms that allow for quick and easy electronic signature creation and document sharing, DocuSign offers a highly streamlined mobile experience tailored to rapid signature collection.

The app excels in field environments where sales agents or service technicians need to collect in-person signatures on a mobile device screen. Its offline mode allows signatures to be gathered without an active cellular connection, automatically uploading completed agreements and generating cryptographic audit trails as soon as connectivity returns. While DocuSign does not allow users to edit underlying PDF text or restructure document layouts on mobile screens, its specialized signature routing, status dashboards, and deep enterprise CRM integrations make it a formidable choice for contract-centric businesses.

3. Dropbox Sign

An intuitive mobile signing solution offering streamlined document dispatches and native cloud storage workflow integration.

Key features

• Direct integration with Dropbox cloud storage for seamless file fetching.
• Touchscreen signature capture with customizable brush thickness and ink style.
• Mobile reusable template execution for standardized forms and NDAs.
• Real-time document activity tracking and audit trail generation.
• Multi-party signature requests with mobile-optimized sign-in flows.

Best for: Freelancers, small business owners, and remote teams who rely heavily on Dropbox for cloud document storage and quick signature requests.

Pricing: As of 2026, individual Essentials plans start at $15 per user per month when billed annually, with team plans scaling based on administrative features.

Dropbox Sign (formerly known as HelloSign) delivers a frictionless mobile experience tailored toward speed and simplicity. Designed to sit naturally within cloud file management, the mobile app lets users pull documents directly from cloud directories, place signature and text tags, and issue signature requests within seconds. The signature creation interface is smooth and responsive, allowing signers to draw their signature with a finger or stylus, select a stylized font signature, or upload a photo of a handwritten physical signature.

For small teams that frequently send repetitive documents such as non-disclosure agreements, independent contractor contracts, or liability waivers, Dropbox Sign allows users to launch pre-configured templates directly from a smartphone. Completed documents automatically save back into designated cloud folders along with complete audit trails detailing IP addresses and time logs. While it does not function as a full PDF editor for modifying underlying document content on a phone, its lightweight design makes it one of the fastest apps for mobile electronic signature creation and document sharing.

4. PandaDoc

A sales-driven mobile document platform combining proposal creation, interactive signature gathering, and real-time recipient tracking.

Key features

• Mobile view analytics showing which pages recipients read and where they spend time.
• Touchscreen signature placement and custom field collection.
• Mobile approval workflows for manager sign-offs on quotes and discounts.
• Interactive pricing tables and payment collection fields inside documents.
• Mobile push notifications for instant recipient interaction updates.

Best for: Account managers, field sales teams, and consultants who send proposals, estimates, and sales contracts directly from mobile devices.

Pricing: As of 2026, Essentials plans start at $19 per user per month on annual billing, with Business plans priced at $49 per user per month.

PandaDoc approaches mobile document workflows from a sales enablement perspective. Rather than serving purely as a PDF utility, it empowers mobile professionals to create, customize, send, and track business proposals and contracts. When a client opens a document on their phone, the PandaDoc app alerts the sender instantly, providing actionable insights into which pages were reviewed, how long was spent on pricing sections, and when the electronic signature was completed.

The platform enhances mobile document workflows by enabling easy PDF signing and sharing alongside integrated payment collection through services like Stripe and PayPal. Signers can review terms, fill out required fields, draw an electronic signature, and submit deposit payments directly within a single mobile session. For field executives who need to gain instant manager approval on revised pricing before sending contracts to clients, PandaDoc provides quick mobile notification approvals, ensuring deals continue moving forward from anywhere.

5. SignNow

A cost-effective mobile signature platform providing powerful offline signing, kiosk modes, and group form management.

Key features

• Mobile Kiosk mode for continuous in-person document signing on tablets and smartphones.
• Offline document completion with automated background cloud syncing.
• Sequential and parallel recipient signature routing.
• Custom brand logos and personal color scheme integration on mobile signature requests.
• Fillable field creation including check boxes, dropdowns, and radio buttons.

Best for: Small to mid-sized businesses needing bulk document collection, field surveys, or affordable team e-signature capabilities.

Pricing: As of 2026, Business plans start at $8 per user per month on annual billing, while Business Premium costs $15 per user per month.

SignNow stands out by delivering enterprise-grade mobile signature features at a budget-friendly price point. One of its standout mobile capabilities is Kiosk mode, which transforms an iPad or Android tablet into a secure signing terminal. Once a document or form is completed and signed by a client, the app automatically resets the screen for the next sign-in without granting access to other files or account settings, making it ideal for medical intakes, trade shows, and field service agreements.

The mobile application allows users to build complex fillable forms with mandatory fields, dropdown selections, radio buttons, and clear touchscreen signature boxes. Offline functionality ensures field agents working in rural areas or subterranean job sites can capture legally binding signatures, which automatically sync with cloud storage once an internet connection is re-established. While SignNow does not offer advanced mobile text editing for changing PDF prose on the fly, its combination of affordable seat pricing, field accessibility, and detailed audit trails makes it a popular option for operational teams.

6. Smallpdf

A lightweight mobile utility focused on fast PDF signature stamping, file compression, format conversion, and simple form filling.

Key features

• Rapid touchscreen signature creation and saved electronic initials.
• Built-in mobile scanner with auto-cropping and image enhancement filters.
• PDF compression tools to shrink large document files for easy email attachments.
• File format conversion between PDF, Word, Excel, JPG, and PPT on mobile screens.
• Easy page merging, splitting, and rotation controls.

Best for: Students, casual users, and independent professionals looking for a simple, all-in-one mobile utility for quick signature stamps and file adjustments.

Pricing: As of 2026, Pro plans start at $9 per month (billed annually), with limited free daily processing available for basic tasks.

Smallpdf caters to users who prioritize simplicity and speed over complex enterprise agreement management. The mobile application combines essential PDF utilities into an easy-to-navigate interface, allowing users to quickly convert a captured phone camera picture into a clean PDF, add signature stamps, and compress the file for low-bandwidth messaging or email attachments. For individuals seeking platforms that allow for quick and easy electronic signature creation and document sharing, Smallpdf provides a straightforward, hassle-free toolset.

Signing a document in Smallpdf requires just a few taps: users open a file, draw their signature on the screen, position the scalable signature box onto the document, and export the finalized PDF. The app also excels at quick structural modifications, enabling mobile users to reorder pages, merge multiple PDFs into a single file, or split multi-page reports into smaller segments directly on iOS and Android devices. While it is not designed for tracking complex multi-step corporate approvals or detailed compliance auditing, Smallpdf serves as a practical, lightweight solution for daily mobile document tasks.

7. Foxit

A high-performance mobile PDF editor that combines advanced document annotation, dynamic form filling, and digital signature capabilities.

Key features

• Advanced text, shape, and image editing inside mobile PDF documents.
• Touchscreen and stylus signature insertion with cryptographic verification.
• Dynamic form field creation and automated field recognition.
• ConnectedPDF support for tracking document views and access rights.
• Extensive annotation tools including highlight, strikeout, notes, and freehand drawing.

Best for: Legal professionals, engineers, architects, and technical power users needing heavy document review and annotation alongside mobile signing.

Pricing: As of 2026, Foxit mobile PDF Editor and eSign packages range from $10 to $12 per month (or around $120 per year) depending on cloud subscription bundles.

Foxit is built for mobile power users who require extensive document manipulation capabilities alongside signature workflows. Unlike basic signing utilities, Foxit equips iOS and Android users with a desktop-class PDF editing engine. Users can touch existing paragraph text inside a PDF to fix typos, change font formatting, insert imagery, or rearrange page sequences directly on a tablet or mobile screen. Stylus integration allows architects, engineers, and legal experts to mark up blueprints, draw schematics, and annotate contracts with precision.

When it comes to form filling and signature placement, Foxit detects interactive fields automatically and provides smooth touchscreen signature inputs. The app supports digital certificates and cryptographic signatures, ensuring document integrity and anti-tamper security for legal compliance. For organizations that want platforms that enhance document workflows by enabling easy PDF signing and sharing without sacrificing technical annotation tools, Foxit provides a versatile mobile workspace capable of handling complex document modifications on the move.

8. Nitro

An enterprise-grade mobile document solution delivering secure PDF viewing, signature requests, and centralized administrative controls.

Key features

• Fast mobile signature tagging and document dispatch.
• Real-time agreement tracking dashboard with status alerts.
• Centralized user management and licensing controls for IT managers.
• Cloud storage integration with Microsoft SharePoint, OneDrive, and Google Drive.
• Clean document viewing engine optimized for mobile devices.

Best for: Corporate IT departments looking for an enterprise PDF and e-signature suite deployed across employee mobile devices.

Pricing: As of 2026, Nitro PDF Pro and eSign subscriptions start at approximately $14 per user per month on annual corporate plans.

Nitro offers corporate environments a unified document workflow ecosystem designed to scale across desktop and mobile deployments. On mobile platforms, Nitro centers its functionality on review, form filling, signature tagging, and agreement dispatch. Mobile workers can access files from enterprise repositories like SharePoint or OneDrive, place required signature and date fields, and send out contracts for execution directly from their mobile device.

The app provides real-time visibility into agreement status, alerting senders as soon as recipients open, review, or sign documents. Nitro places a heavy emphasis on document security and administrative control, giving enterprise IT administrators centralized management over user permissions, cloud storage access, and signature auditing. While Nitro's mobile applications lean more toward signature distribution and document interaction than deep original PDF creation, its security infrastructure and business integrations make it a reliable choice for corporate fleets.

9. Sejda

A flexible, browser-accessible PDF utility providing rapid mobile signature placement, text replacement, and quick document modifications.

Key features

• Web-first design allowing mobile editing and signing through browser or dedicated app.
• Direct text editing inside PDF pages on mobile screens.
• Touchscreen signature drawing and saved electronic stamp creation.
• Page extraction, reordering, and PDF page deletion tools.
• Web form filling and instant PDF flattening capabilities.

Best for: On-the-fly mobile users who want fast browser access to PDF editing and signature tools without installing heavy desktop-style software.

Pricing: As of 2026, options include a $5 week pass, $7.50 per month for Web+Desktop annual plans, and free daily usage limits for light tasks.

Sejda offers a unique web-centric approach to mobile PDF management, enabling users to perform edits and add signatures either through its mobile app or directly inside a mobile browser. This flexibility is ideal for users working on guest devices or those who prefer not to install dedicated applications for occasional document edits. Users can open a PDF file, modify text paragraphs, drop in an electronic signature, and export the file in a matter of minutes.

The platform provides simple signature creation options, allowing users to draw signatures with a touchscreen gesture, type a stylized text signature, or upload an existing signature image. Sejda also includes quick tools for splitting multi-page documents, deleting unnecessary pages, and merging separate files prior to sharing. While its compliance and audit tracking features are basic compared to enterprise solutions, its accessible browser interface and budget-friendly weekly passes make it a practical utility for rapid mobile PDF fixes.

How to choose the best mobile fill and sign tool

Selecting the right mobile fill and sign tool depends on balancing your specific workflow demands, security requirements, and budget constraints. When evaluating apps for iOS or Android, consider the following key factors:

Document editing vs. pure signature collection

Identify whether your primary need is modifying document content or simply capturing signatures. Tools like DocuSign and Dropbox Sign focus heavily on signature routing, envelope tracking, and multi-party workflows, but they do not allow you to rewrite text or modify page layouts inside a PDF. If you frequently need to fix typos, recalculate form values, or scan physical paper into editable digital files, prioritize comprehensive platforms that combine full PDF editing with e-signature tools.

Mobile user interface and touch performance

Signing documents on a smartphone screen requires responsive touch controls. Look for tools that offer stylus smoothing, customizable line thickness, and saved signature vaults. Additionally, if you frequently gather client signatures in person, features like Kiosk mode or offline signing capabilities are critical for uninterrupted field operations.

Legal security and compliance standards

For business agreements, non-disclosure contracts, and legal forms, your signature tool must comply with international electronic signature legislation such as the ESIGN Act in the United States and eIDAS in the European Union. Ensure the platform generates tamper-evident PDF files with audit trails detailing timestamps, signer email addresses, and device IP records.

Cloud integration and mobile ecosystem

Your mobile sign app should connect directly to your existing cloud storage infrastructure. Seamless connections with Google Drive, Microsoft OneDrive, Dropbox, and enterprise repositories ensure that signed agreements are immediately archived in your organization's document retention system without manual downloading and re-uploading.

Why Adobe Acrobat wins for mobile users

While specialized signature tools excel in narrow operational niches, Adobe Acrobat remains the overall superior choice for iPhone and Android users. It eliminates the need to juggle multiple single-purpose apps by integrating complete PDF editing, optical character recognition camera scanning, form creation, and legally binding e-signatures into a single, cohesive ecosystem.

Whether you are scanning a physical agreement on a job site, editing contract terms on a tablet, or distributing high-volume signature requests across an organization, Acrobat delivers matched cross-platform reliability, military-grade security compliance, and unmatched formatting fidelity. For mobile professionals who demand a complete, dependable document engine that handles every stage of the document lifecycle, Adobe Acrobat continues to set the standard for mobile fill and sign solutions.