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Nitro Pro

Nitro Pro is a versatile PDF editing and management software developed by Software, designed as a cost-effective alternative to for professionals and organizations seeking to create, edit, convert, sign, and secure PDF documents across multiple devices. Available on Windows, , iOS, and web platforms. Founded in 2005 in , , by a small team aiming to simplify document workflows, Software has grown into a global document productivity company headquartered in , with operations spanning six hubs across , , and . As of 2025, the company serves over 67% of enterprises and millions of users across 236 countries, emphasizing secure and efficient by eliminating paper-based processes. At its core, Nitro Pro offers robust features tailored for productivity, including text and , batch between PDFs and formats like Word or Excel, (OCR) for scanned documents, and AI-powered tools for summarization and data extraction. Security is a key focus, with capabilities such as Smart Redact to remove sensitive information and compliance certifications including SOC 2, HIPAA, and ISO 27001, ensuring safe collaboration through annotations, comments, and electronic signing. Available in tiered plans—, , and —Nitro Pro supports individual users to large enterprises with transparent , a 14-day free trial, and 24/7 , making it a scalable for streamlining workflows without hidden fees.

Product Overview

Description

Nitro Pro is a commercial software application designed for the creation, editing, viewing, and conversion of PDF documents, developed by Nitro Software Inc. It provides users with comprehensive tools to handle PDF files across various workflows, enabling seamless management of digital documents in professional and personal settings. As an affordable alternative to Adobe Acrobat, Nitro Pro caters to business and individual users by offering robust PDF functionalities at a lower cost, facilitating efficient document processing without the need for expensive subscriptions. The software integrates into document management practices, supporting tasks such as form filling, annotation, and secure sharing to streamline collaboration and protect sensitive information. Nitro Pro supports Windows (10 and 11), macOS (10.14 or later), and iOS/iPadOS (15 or later), ensuring compatibility with modern desktop and mobile environments. Originally launched in 2006 as Nitro PDF Professional, it has established itself as a reliable solution for PDF-centric operations.

Key Features

Nitro Pro provides a suite of core editing tools that enable users to modify PDF documents directly without requiring the original source files. These include text editing capabilities, allowing for the addition, deletion, or alteration of text with customizable fonts, sizes, and styles while preserving the document's layout. Image insertion supports embedding photos, logos, or graphics, with options to resize and position them seamlessly. Page reorganization features facilitate inserting, deleting, rotating, or rearranging pages, and Bates numbering adds sequential identifiers for legal and compliance purposes, such as in discovery documents. The software excels in conversion capabilities, supporting of files from , Excel, PowerPoint, and various image formats into PDFs, as well as exporting PDFs back to these editable formats. This process maintains original formatting, fonts, and layouts to ensure professional output, making it suitable for workflows involving mixed document types. Security features in Nitro Pro are robust, incorporating password protection to restrict access, tools to permanently remove sensitive information, and support for digital signatures that comply with legal standards like and ESIGN. It employs AES-256 encryption as the default for securing documents against unauthorized viewing or editing, aligning with industry standards for data protection. For annotation and collaboration, Nitro Pro offers markup tools such as highlighters, underlines, strikethroughs, and for comments, along with customizable stamps for approvals or reviews. with cloud services like , , , and enables real-time sharing and collaborative editing, allowing multiple users to annotate and track changes efficiently. (OCR) functionality transforms scanned paper documents or images into searchable and editable PDFs, accurately recognizing text while matching original fonts for a natural appearance. This feature supports multiple languages and for efficiency in digitizing archives. Batch processing automates repetitive tasks, including merging multiple files into a single PDF, splitting documents by page ranges, and compressing files to reduce size without significant quality loss. These tools streamline workflows for handling large volumes of documents, such as in legal or administrative environments. Nitro Pro also includes AI-powered tools, such as the Knowledge Assistant for document summarization and data extraction, enhancing productivity in analyzing and processing PDF content.

Company and Development

Nitro Software

Nitro Software, Inc. is a privately held global document productivity company founded in 2005 in , , by a small team dedicated to creating accessible and affordable PDF solutions for businesses. With global headquarters in , (founded in ), the company maintains a network of six offices, including locations in , , , , , and , with approximately 350 employees as of 2025. Nitro's business model emphasizes PDF productivity tools tailored for enterprises and small to medium-sized businesses (SMBs), featuring products such as Nitro Pro for document creation and editing, Nitro Sign for electronic signatures, and Nitro Analytics for performance insights. Significant milestones include the introduction of Nitro Cloud in 2013, which expanded the company's offerings into cloud-based services, and the acquisition of Connective in December 2021 to enhance eSign capabilities; the company reached over 1 million active subscription PDF licenses by the end of fiscal year 2021. As of 2025, Nitro is led by CEO Cormac Whelan, who assumed the role in 2023 following the tenure of co-founder Sam Chandler.

History of Development

Nitro Pro, originally launched as Nitro PDF Professional in 2005 by Nitro Software in , , emerged as a Windows-based PDF editor designed to provide an affordable alternative to . The software focused on core functionalities such as PDF creation, editing, and conversion, targeting business users seeking cost-effective tools without the premium pricing of established competitors. Early development emphasized user-friendly interfaces and compatibility with Windows environments to facilitate seamless document workflows in professional settings. During the 2010s, Nitro Pro underwent key phases of evolution, including the introduction of collaboration features through Nitro Cloud in , which enabled browser-based document sharing, signing, and real-time teamwork without requiring desktop installations. Following this, the product shifted toward an integrated productivity suite, bundling PDF tools with enhanced workflow capabilities to support broader document management needs. This period also saw integrations with for direct PDF handling within familiar applications and cloud services like for streamlined file access and synchronization. Technological advancements continued with the adoption of AI-driven enhancements, such as improved OCR capabilities integrated into recent versions for more accurate text extraction from scanned documents. The software has placed strong emphasis on security compliance, achieving alignment with regulations like GDPR to ensure data protection in enterprise use. No major acquisitions directly impacted core product development, though strategic partnerships and the 2021 Connective acquisition bolstered ecosystem compatibility, particularly for eSign features. As of 2025, Nitro Pro's development has centered on hybrid cloud-desktop models, combining on-premise editing with cloud-based collaboration and AI automation features like smart redaction. This evolution coincides with a transition to subscription-based licensing, with all perpetual licenses for Windows versions scheduled for deactivation by December 31, 2025, to streamline support and updates.

Software Versions

Release History

Nitro Pro's development began with version 5 in 2006, focusing on basic PDF creation, editing, and viewing capabilities as an affordable alternative to . Subsequent releases through version 9, spanning 2006 to 2014, gradually expanded core functionalities, including improved document conversion from formats and enhanced security features such as password protection and digital signatures. Version 10, released in June 2015, marked a significant advancement with the introduction of (OCR) for scanned documents and tools for handling multiple files efficiently. Versions 11 through 13, released between 2016 and 2020, integrated mobile synchronization across devices and capabilities, aligning with growing demand for collaborative workflows. For instance, version 11 launched in July 2016 with cloud storage integrations like and . Version 14 debuted on May 18, 2023, incorporating AI-assisted editing tools and deeper cloud integration for seamless document management. Ongoing patch updates have addressed specific enhancements, such as version 14.30 in 2024, which added features like improved support. Security vulnerabilities like CVE-2023-36664 were mitigated in early 2023 updates to versions 13.70.7.60 and 14.7.1.21. As of 2025, Nitro Pro follows an annual major release cycle supplemented by quarterly patches for bug fixes and updates. Support for older versions has been phased out progressively; for example, version 10 received until approximately 2020, after which activation servers were decommissioned, and versions prior to 13 lack official , receiving only basic community resources.

Current Version

As of November 2025, the current of Nitro Pro is 14.41.1.4, released on November 13, 2025, primarily for Windows and MacOS operating systems. This update builds on the software's core PDF capabilities, focusing on refinements that enhance and reliability for workflows. Key improvements in 14.41.1.4 include an improved installation process, enhanced file combining reliability, better PDF/A-2b conversion, optimized disk usage, and improved for signed documents. Additionally, functionalities have been optimized for seamless integration with formats, such as Word and Excel, allowing for more accurate preservation of layouts and metadata during conversions. The release also incorporates targeted bug fixes to improve overall stability, addressing issues like crashes during large file processing and inconsistencies in rendering high-resolution images. A MacOS version, 14.10, was released on July 31, 2025, with features like enhanced PDF/A-1b export and added Trust Center links. Nitro Pro 14.41.1.4 requires or 11 (64-bit) as the operating system, with a minimum of 4 RAM and 500 of available storage space. It maintains compatibility with ARM-based processors, enabling efficient performance on modern Windows devices like those powered by chips. Ongoing for this version includes regular patch releases to address vulnerabilities, ensuring with standards like and encryption protocols. The software integrates directly with Nitro's cloud platform, Nitro Workspace, for collaborative and secure across teams.

Licensing and Availability

Pricing Options

Nitro Pro offers flexible options tailored to individual users, teams, and enterprises, primarily through subscription models with a limited one-time purchase alternative. The standard subscription, Nitro PDF Standard, is priced at $180 per user per year (or $15 per month), providing access to core PDF creation, , , , and features, along with AI-powered tools, 24/7 , and integrations with popular applications. This plan includes automatic updates. For larger organizations, the Nitro PDF Plus subscription features with discounts available upon inquiry, incorporating advanced enterprise capabilities such as (SSO), domain controls, Nitro Analytics for document insights, and a dedicated manager. Custom quotes are available for enterprise-scale deployments, which may include access and enhanced protocols. A one-time purchase option, Nitro PDF Classic, is available for $270 per license, offering a three-year term limited to Windows users with essential PDF editing, , and file management tools but without ongoing updates beyond the term. Nitro Pro provides a 14-day free trial with full access to all features, requiring no , allowing users to evaluate the software before committing to a purchase. Add-ons such as Nitro Sign, an e-signature tool, are priced separately at $15 per user per month (or $180 per year) for the Standard plan, enabling secure document signing, templates, and trails; higher tiers with bulk sending and custom branding are available via volume discounts. is denominated in USD globally, with applicable taxes added at checkout, and no explicit regional variations are applied; however, volume-based discounts may reduce costs for educational or non-profit entities upon direct inquiry.

Perpetual License Transition

In 2023, Nitro Software announced its decision to deactivate all perpetual licenses for Nitro Pro on Windows by December 31, 2025, as part of a broader shift to a subscription-based model. This policy specifically targets licenses purchased before 2021, with affected users receiving email notifications beginning in 2024 to inform them of the impending changes. As of November 2025, some users have reported early deactivations of older versions, amid growing complaints. To facilitate the transition, Nitro provides migration support including discounted subscription offers, such as over 70% off on Nitro PDF Standard plans locked in for three years, along with access to the latest versions across Windows, Mac, and iOS platforms. Legacy users retain functionality until the deactivation date, after which the software will require activation via subscription to continue operating. The company has stated that this move enables ongoing innovation, security updates, and compliance, particularly addressing unpatched vulnerabilities in older perpetual versions. No refunds are offered for unused portions of perpetual license terms. The transition impacts a substantial number of legacy Nitro Pro users who relied on one-time purchases, prompting many to explore subscription alternatives or competing PDF solutions with perpetual options.

Reception and Criticism

Reviews and Ratings

Nitro Pro has received generally positive evaluations from professional sites, with aggregate scores ranging from 4.0 to 4.5 out of 5. On , it holds a 4.4/5 based on 363 reviews, praising its user-friendly and feature set for PDF . TechRadar's 2024 awarded it 4/5 stars, highlighting its comprehensive editing capabilities as a strong alternative to more expensive options. Reviewers frequently commend Nitro Pro for its ease of use, particularly for non-expert users, along with its affordability compared to and robust tools for , annotating, and converting documents. In a PCWorld review, it earned 4.5/5 for offering full-featured PDF at a lower cost, making it ideal for small businesses and individuals seeking Adobe-like functionality without the subscription model. Software Advice users rate it 4.5/5 across 564 reviews, noting its intuitive design and value for money in handling text, images, and signatures efficiently. Criticisms in professional assessments include occasional interface lag during heavy edits and limited native mobile support, with no full Android editing app available. Capterra's 4.5/5 rating from 564 reviews acknowledges strong conversion accuracy but points to minor glitches in complex file handling. Nitro Pro won TechRadar's "Best PDF Editor for Business" award in 2024 for its balance of features and accessibility. In comparisons, it often ranks second to for enterprise-level features, per user data emphasizing Adobe's superior integrations while Nitro excels in setup ease.

User Feedback

Users frequently praise Nitro Pro for its intuitive interface, which simplifies PDF editing and conversion tasks, making it accessible even for non-technical users. Many owners highlight its reliability in handling PDF conversions, noting that it streamlines document workflows without the complexity of more expensive alternatives. The software's cost-effectiveness, particularly through its one-time purchase option, is another common positive, allowing users to achieve significant savings compared to subscription-based competitors like . Additional commendations focus on the speed of PDF creation and editing, with users reporting quick file processing that enhances productivity. Customer onboarding is also appreciated for its straightforward setup and minimal learning curve, enabling rapid adoption in professional settings. Overall functionality satisfaction stands at approximately 86% based on recent evaluations from TrustRadius, reflecting strong performance in core features. On the negative side, a notable portion of users report crashes, particularly during of large volumes of files, which can disrupt workflows and require restarts. Formatting inconsistencies, such as loss of table structures or text alignment during exports to formats like Word, are also recurrent complaints in user reviews. These issues appear in about 15-20% of detailed feedback across platforms, often affecting document accuracy. Support interactions receive mixed responses, with average ticket resolution delays reported around or more in some cases, though email channels tend to yield better outcomes than live chat. Users express frustration over inconsistent response times, especially for technical troubleshooting. However, user sentiment varies by platform; on , Nitro Software holds a 2.8/5 rating from 327 reviews as of , with many criticisms centered on the impending deactivation of older perpetual licenses and support responsiveness. Feedback trends show improvement following the release of version 14, with enhanced stability and fewer reported glitches contributing to higher overall satisfaction. This is evidenced by an average rating of 4.5 out of 5 on Software Advice, drawn from 564 verified reviews as of 2025.

Controversies

Nitro Software's decision to deactivate perpetual licenses for older versions of Pro has sparked significant controversy among users. In , the company announced that all perpetual licenses for Windows versions of Nitro Pro 13 and earlier would expire by December 31, 2025, requiring customers to upgrade to subscription-based models or newer perpetual options for continued access. This policy shift, outlined in Nitro's Product Updates & Sunset Policy, was justified as necessary to focus resources on supported releases, with activation servers for discontinued versions being shut down to prevent security vulnerabilities. However, many users who had purchased these licenses as one-time, lifetime investments viewed the deactivation as a of , leading to widespread complaints about the retroactive invalidation of paid products. The deactivation process involved automated notifications and remote disabling of software installations, exacerbating frustration over lost functionality without refunds or extended . Complaints highlighted the impact on businesses and individuals reliant on the software for document management, with reports of sudden inoperability disrupting workflows. While Nitro offered upgrade paths, the lack of grandfathering for existing perpetual s fueled perceptions of aggressive tactics. A major data privacy incident further tarnished Nitro's reputation. In September 2020, an unauthorized third party gained limited access to Nitro's databases, compromising personal information of over 70 million users, including email addresses, names, usernames, and document titles associated with PDF workflows. Although Nitro described the breach as isolated and stated that no financial data or full documents were exposed, the scale of the compromise—potentially affecting employees at major organizations like , , and Apple—drew scrutiny over cloud sync and data handling practices. The company responded by notifying affected users, enhancing measures, and cooperating with investigations, but the event underscored ongoing concerns about reliability in Nitro's cloud-integrated features. Customer support and business practices have also faced criticism, as evidenced by Nitro Software's status with the (BBB). As of November 2025, the company is not BBB accredited, has an F rating, and has logged 21 complaints over the past three years, with 20 closed in the last 12 months alone. These primarily involve service issues (8 complaints), product problems (5 complaints), and billing disputes, often tied to license deactivations, unauthorized charges, and software glitches. Many users reported inadequate responses from support teams, including delays in resolving activation failures or refund requests, contributing to perceptions of poor post-sale reliability.

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