# Best Online Fax Software - Page 4

*By [Neeraja Prakash](https://research.g2.com/insights/author/neeraja-prakash)*


Online fax software enables users to securely send and receive faxes digitally. These platforms can transmit faxes through the software platform itself, by email, or from a platform’s mobile app, essentially turning a computer into a fax machine.

These tools save businesses the cost of paper, ink, and the machine itself. These solutions enable users to securely store documents as well as digitally sign and edit faxes, all without printing out documents. Online fax software platforms also remove hassles like a busy fax line. Additionally, a business has an existing fax number, they can transfer it to the fax software solution.

Online fax software performs the same functions as a fax machine, including the sending and receiving of faxes. These tools should not be confused with [email software](https://www.g2.com/categories/email). Online fax software sends electronic documents, typically in PDF format, directly to the recipient’s inbox via a fax number, while email software enables users to send electronic messages straight to the intended recipient’s inbox. While very similar, online fax is the preferred method for sending documents, specifically signed or confidential ones, as the transmission of information is typically more secure than email.

To qualify for inclusion in the Online Fax category, a product must:

- Allow users to send and receive a fax directly from the platform, an email account, or a mobile app
- Give users the ability to edit and sign documents within the tool
- Provide the ability to integrate with an existing fax number





## Top Online Fax Software at a Glance
| # | Product | Rating | Best For | What Users Say |
|---|---------|--------|----------|----------------|
| 1 | [RingEX](https://www.g2.com/products/ringex/reviews) | 4.2/5.0 (1,378 reviews) | CRM-integrated fax on unified business number | "[Seamless Communication, Unifies Our Workflow](https://www.g2.com/survey_responses/ringex-review-12983792)" |
| 2 | [iFax](https://www.g2.com/products/ifax/reviews) | 4.7/5.0 (465 reviews) | HIPAA-compliant faxing without physical machines | "[Seemless email to Fax solution with peach of mind](https://www.g2.com/survey_responses/ifax-review-12210933)" |
| 3 | [eFax Online Fax Service](https://www.g2.com/products/efax-online-fax-service/reviews) | 4.4/5.0 (198 reviews) | Email-integrated faxing without physical machines | "[eFax simplifies secure, professional, remote-friendly faxing with AI-powered efficient](https://www.g2.com/survey_responses/efax-online-fax-service-review-12830157)" |
| 4 | [Upland InterFAX](https://www.g2.com/products/upland-interfax/reviews) | 4.6/5.0 (156 reviews) | API-driven faxing for healthcare integrations | "[Sending Faxes Has Never Been Easier User](https://www.g2.com/survey_responses/upland-interfax-review-13106979)" |
| 5 | [GoTo Connect](https://www.g2.com/products/goto-connect/reviews) | 4.4/5.0 (1,390 reviews) | Unified phone and fax with VoIP | "[Easy Setup, Empowers Call Center Efficiency](https://www.g2.com/survey_responses/goto-connect-review-1180338)" |
| 6 | [HelloFax](https://www.g2.com/products/hellofax/reviews) | 4.5/5.0 (57 reviews) | Paperless faxing without physical machines | "[Does what it's supposed to do](https://www.g2.com/survey_responses/hellofax-review-8997374)" |
| 7 | [Documo](https://www.g2.com/products/documo/reviews) | 4.6/5.0 (214 reviews) | HIPAA-compliant faxing with EMR integration | "[Easy to Install, Insightful Reports, and Top-Notch Support](https://www.g2.com/survey_responses/documo-review-12501274)" |
| 8 | [OpenText Core Fax](https://www.g2.com/products/opentext-core-fax/reviews) | 4.5/5.0 (46 reviews) | Enterprise HIPAA-compliant fax server consolidation | "[Best fax SW I was ever working with, with great possibilities of customization.](https://www.g2.com/survey_responses/opentext-core-fax-review-4457043)" |
| 9 | [WestFax](https://www.g2.com/products/westfax/reviews) | 4.8/5.0 (31 reviews) | API-driven fax integration with developer support | "[Effortless Integration and Excellent Support](https://www.g2.com/survey_responses/westfax-review-12311798)" |
| 10 | [Sfax](https://www.g2.com/products/sfax/reviews) | 3.7/5.0 (14 reviews) | — | "[Sfax is quick, easy and HIPAA compliant!](https://www.g2.com/survey_responses/sfax-review-553454)" |


## G2 Grid® for Online Fax Software
![G2 Grid® for Online Fax Software plotting products by satisfaction and market presence](https://www.g2.com/categories/online-fax/grids.png?focus%5B%5D=1173&focus%5B%5D=81124&focus%5B%5D=1259222&focus%5B%5D=133160&focus%5B%5D=3695&focus%5B%5D=14857&focus%5B%5D=43109&focus%5B%5D=15611)
Highlighted products: RingEX, iFax, eFax Online Fax Service, Upland InterFAX, GoTo Connect, HelloFax, Documo, and OpenText Core Fax.
Underlying data: [Grid® JSON](https://www.g2.com/categories/online-fax/grids.json?focus%5B%5D=ringex&focus%5B%5D=ifax&focus%5B%5D=efax-online-fax-service&focus%5B%5D=upland-interfax&focus%5B%5D=goto-connect&focus%5B%5D=hellofax&focus%5B%5D=documo&focus%5B%5D=opentext-core-fax)


## How Many Online Fax Software Products Does G2 Track?
**Total Products under this Category:** 74

### Category Stats (Jul 2026)
- **Average Rating**: 4.31/5 The average rating of products in this category, based on all submitted ratings
- **Top Trending Product**: Upland InterFAX (+0.39%) - Among all products in this category, Upland InterFAX recorded the largest rating increase compared to last month
*Last updated: July 19, 2026*


## How Does G2 Rank Online Fax Software Products?

**Why You Can Trust G2's Software Rankings:**

- 30 Analysts and Data Experts
- 4,300+ Authentic Reviews
- 74+ Products
- Unbiased Rankings

G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.


## Which Online Fax Software Is Best for Your Use Case?

- **Leader:** [RingEX](https://www.g2.com/products/ringex/reviews)
- **Highest Performer:** [iFax](https://www.g2.com/products/ifax/reviews)
- **Easiest to Use:** [Documo](https://www.g2.com/products/documo/reviews)
- **Top Trending:** [iFax](https://www.g2.com/products/ifax/reviews)
- **Best Free Software:** [iFax](https://www.g2.com/products/ifax/reviews)


---

**Sponsored**

### ClickSend

ClickSend is a simple, reliable SMS platform built for businesses that can't afford to miss a message. It’s seriously simple infrastructure that works straight out of the box — and keeps working as you grow. Backed by genuinely helpful 24/7 support from people who actually know their stuff. Send from the Dashboard in just a few clicks — or straight from your email inbox. Build with our clean, well-loved API docs. Or connect through hundreds of integrations and slot it straight into the tools your team already uses. Most users are up and sending within minutes. No developers required (but if you have one, they'll love us too). Why 90,000+ businesses and developers choose ClickSend: · Direct carrier routes to 190+ countries — no middlemen, no grey routes · 99.95%+ uptime so your messages go out when it matters · Lightning-fast delivery for time-sensitive comms · Pay-as-you-go pricing — scale up, scale down, only ever pay for what you send · 24/7 support from real people who actually understand the platform It's built for operational messaging as much as marketing. Appointment reminders, delivery notifications, 2FA codes, staff alerts, booking confirmations — the communications that keep a business running day to day. Trusted by healthcare and wellness clinics, financial services, real estate agencies, education providers, event organisers, construction companies and not-for-profits — and the developers building messaging into their products and workflows.



[Visit website](https://www.g2.com/external_clickthroughs/record?secure%5Bad_program%5D=ppc&secure%5Bad_slot%5D=category_product_list&secure%5Bcategory_id%5D=1466&secure%5Bchosen_at%5D=2026-07-19T14%3A53%3A24Z&secure%5Bdisplayable_resource_id%5D=1466&secure%5Bdisplayable_resource_type%5D=Category&secure%5Bmedium%5D=sponsored&secure%5Bplacement_reason%5D=page_category&secure%5Bplacement_resource_ids%5D%5B%5D=1466&secure%5Bprioritized%5D=false&secure%5Bproduct_id%5D=138049&secure%5Bresource_id%5D=1466&secure%5Bresource_type%5D=Category&secure%5Bsource_type%5D=category_page&secure%5Bsource_url%5D=https%3A%2F%2Fwww.g2.com%2Fcategories%2Fonline-fax&secure%5Btoken%5D=3d1423ef0e97e64e64f558ccf1bfbb2dc72787c93ee5b54d6f7b222042c09390&secure%5Burl%5D=https%3A%2F%2Ftry.clicksend.com%2Fen%2Fstart-sending%2F%3Futm_source%3Dg2%26utm_medium%3Dpaid%26utm_campaign%3Dppc_campaign&secure%5Burl_type%5D=free_trial)

---


## What Is Online Fax Software?

[Collaboration & Productivity Software](https://www.g2.com/categories/collaboration-productivity)