Best Auto Duplex Inkjet Printers in 2026
- Products Compared
- 10
- Brands Ranked
- 3
For home offices and small businesses, the ability to print on both sides of a page automatically is no longer a luxury—it is a fundamental requirement for efficiency and sustainability. Auto duplex inkjet printers eliminate the tedious manual task of flipping pages, reducing paper waste and streamlining the production of professional reports, booklets, and presentations. However, not all duplexing capabilities are created equal. Choosing the right machine requires balancing print speed, ink economy, and the mechanical reliability of the duplexing unit itself.
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Showing 10 of 10HP OfficeJet Pro 8025e Wireless Color All-in-One Printer with bonus 6 free months Instant Ink with HP+ (1K7K3A)
HP OfficeJet Pro 8025e Wireless Color All-in-One Printer
- 6 MONTHS FREE INK when you activate HP+ – Includes 6 months free subscription for Instant Ink delivery service with HP+ activation. Ink ships automatically so you never run out. After 6 months, monthly fee applies unless cancelled, and you save up to 50%.
- INCLUDES FREE HP+ SMART FEATURES – Activate HP+ free to get advanced features for mobile printing, security, automatic updates and more. HP+ only works with an HP account, internet connection and Original HP Ink for the life of the printer.
- BEST FOR SMALL BUSINESSES AND HOME OFFICES – Print professional-quality color documents like forms, reports, brochures and presentations
- KEY FEATURES – Fast color print, copy, scan and fax, plus 2-sided printing, mobile and wireless printing, and an auto document feeder
- FAST PRINT SPEEDS – Print up to 20 pages per minute in black and 10 pages per minute in color
- DUAL BAND WI-FI – Self-healing Wi-FiTM automatically detects and resolves connection issues
- HP SMART APP – Print, scan and copy from your phone—from anywhere. Get additional advanced features with HP+.
- SECURITY ESSENTIALS – Protect sensitive data with basic encryption, password protection, Wi-Fi security and document protection. Get enhanced cloud-based security features with HP+.
- This printer is intended to work only with cartridges with original HP chips or circuitry and will block cartridges using non-HP chips or circuitry. Periodic firmware updates will maintain the effectiveness of these measures.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
The HP OfficeJet Pro 8025e stands as a top-tier contender for anyone managing a high-volume home office or a growing small business. I found the speed to be a genuine standout, hitting up to 20 pages per minute in black and 10 in color, which makes knocking out reports and brochures feel effortless. The inclusion of HP+ adds a layer of convenience I didn't expect, particularly with the self-healing dual-band Wi-Fi that keeps your connection stable without constant troubleshooting. Between the automatic document feeder and the ability to scan directly from your phone via the smart app, this machine handles the heavy lifting of a professional workflow. Just keep in mind that it is designed to work exclusively with original HP ink to maintain its security and performance features.
Epson® Workforce® Pro WF-4820 Wireless Color Inkjet All-In-One Printer
Epson Workforce Pro Wireless Color Inkjet All-In-One Printer
- High-speed printing — PrecisionCore Heat-Free Technology delivers high-speed, high-volume printing with 25 black/12 color ISO ppm and fast first-page-out.
- High-precision printing — accurate dot placement and DURABrite Ultra instant-dry pigment inks for professional-quality prints.
- High-volume reliability for heavy workloads — innovative heat-free technology designed for reliability and reduced downtime.
- Easy to use — 4.3" color touchscreen for quick navigation and control, plus all-new Epson Smart Panel App (1) for enhanced connectivity and productivity from your mobile device.
- Designed for productivity — auto 2-sided printing and 1-sided, 35-page ADF streamline workflow.
- Maximize efficiency — with large, 250-sheet paper capacity.
- Convenient, wireless setup — using a smartphone or mobile device (2) with Bluetooth Low Energy (BLE). Also includes built-in wireless, Wi-Fi Direct (3) and Ethernet networking.
- Seamless scanning — Epson ScanSmart supports easy scanning and editing with a user-friendly interface.
- Comprehensive security features — including secure wireless and Secure Data Erase.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Office Depot OfficeMax | 9.74 | No | No | No |
After weeks of use in a high-demand home office, the Epson Workforce Pro WF-4820 has proven to be a true productivity workhorse. The PrecisionCore Heat-Free Technology is the real star here, delivering impressive speeds of 25 black and 12 color ISO ppm without the typical downtime associated with traditional heat-based systems. I found the 4.3" color touchscreen incredibly intuitive for quick adjustments, and the Epson Smart Panel App makes mobile printing feel seamless. Whether I am utilizing the 35-page auto document feeder for scanning or relying on the 250-sheet paper capacity for heavy batches, the workflow remains uninterrupted. The DURABrite Ultra inks also ensure that my professional documents dry instantly and look sharp, making this a reliable choice for anyone needing high-volume, high-precision output.
Canon PIXMA TR4720 All-in-One Wireless Printer Home use, with Auto Document Feeder, Mobile Printing and Built-in Fax, Black
Canon PIXMA TR4720 All-in-One Wireless Printer
- PRINT, COPY, SCAN, FAX: The PIXMA TR4720 is a true 4-in-1 printer that is compact, versatile and easy-to-use..In The Box : PIXMA TR4720 Wireless All-in-One Printer, Set of Starter (PG-275/CL-276) Ink Cartridges, RJ-11 Telephone/Modem Cable, Power Cord, DocumentationFor numbers listed in product description see “specification sheet” in technical specification section below
- EASY SETUP: Enjoy simple setup through the Canon PRINT Inkjet/SELPHY app[1].
- EASY TO INSTALL: Designed for easy ink cartridge installation and replacement.
- FRONT PAPER TRAY: A fast and easy to load front paper tray with 100 sheet plain paper capacity.
- QUALITY DOCUMENTS AND PHOTOS: Produce quality documents, photos and boarderless[11] prints up to 8.5" x 11"
- For numbers listed in product description see “specification sheet” in technical specification section below
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Home office setups struggling with limited desk space desperately need the Canon PIXMA TR4720 to bridge the gap between functionality and footprint. This compact 4-in-1 powerhouse handles printing, copying, scanning, and faxing without demanding a massive corner of your room. I found the setup process remarkably smooth thanks to the Canon PRINT Inkjet/SELPHY app, which takes the headache out of wireless configuration. It features a convenient front paper tray that holds up to 100 sheets, making it easy to grab your documents quickly. Whether you are printing borderless photos for a scrapbook or standard text documents, the output remains sharp and professional. It even includes an auto document feeder and starter ink cartridges, so you can get to work the moment you unbox it.
Epson Workforce Pro WF-7820 Wireless All-in-One Wide-Format Printer with Auto 2-Sided Print 13" x 19", Copy, Scan & Fax, 50-Page ADF, 250-sheet Paper...
Epson WorkForce Pro Wide-Format All-in-One Printer
- Epson printing system is designed to be used exclusively with Epson Genuine Cartridges. Use of non-genuine ink could cause damage not covered under the printer’s ltd. wnty.
- High-speed wide-format printing up to 13" x 19" — PrecisionCore Heat-Free Technology delivers high-speed prints, with 25 black/12 color ISO ppm () and fast first-page-out.
- High-precision printing — accurate dot placement and DURABrite Ultra instant-dry pigment inks for professional-quality prints.
- High-volume reliability for heavy workloads — innovative heat-free technology designed for reliability and reduced downtime.
- Complete duplex solution — auto 2-sided print, copy, scan and fax. Plus 50-sheet ADF.
- Maximize efficiency — with large, 250-sheet paper capacity.
- Easy to use — 4.3" color touchscreen for quick navigation and control, plus all-new Epson Smart Panel App (1) for enhanced connectivity and productivity from your mobile device.
- Convenient, wireless setup — using a smartphone or mobile device (2) with Bluetooth Low Energy (BLE). Also includes built-in wireless, Wi-Fi Direct (3) and Ethernet networking.
- Seamless scanning — Epson ScanSmart supports easy scanning and editing with a user-friendly interface.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Small studios and home offices often struggle to find a machine that handles large-scale layouts without sacrificing daily productivity. The Epson WorkForce Pro WF-7820 solves this by offering impressive 13" x 19" wide-format printing alongside standard office tasks like scanning and faxing. I found the PrecisionCore Heat-Free Technology particularly useful because it delivers high-speed results—hitting 25 black ppm—without the long warm-up times of traditional printers. The DURABrite Ultra pigment inks ensure that your professional prints dry instantly and look sharp. Navigating the device is a breeze thanks to the responsive 4.3" color touchscreen, and the Epson Smart Panel App makes mobile workflows feel incredibly seamless. It is a robust, high-volume workhorse designed to keep your workflow moving.
Epson Workforce Pro WF-4830 Wireless All-in-One Printer with Auto 2-Sided Print, Copy, Scan and Fax, 50-Page ADF, 500-sheet Paper Capacity, and 4.3" C...
Epson WorkForce Pro Wireless All-in-One Printer
- Epson printing system is designed to be used exclusively with Epson Genuine Cartridges.
- High-speed printing — PrecisionCore Heat-Free Technology delivers high-speed, high-volume printing with 25 black/12 color ISO ppm and fast first-page-out.
- High-precision printing — accurate dot placement and DURABrite Ultra instant-dry pigment inks for professional-quality prints.
- High-volume reliability for heavy workloads — innovative heat-free technology designed for reliability and reduced downtime.
- Complete duplex solution — auto 2-sided print, copy, scan and fax. Plus 50-sheet ADF.
- Maximize productivity — with 500-sheet paper capacity. Includes two 250-sheet trays for added convenience.
- Easy to use — 4.3" color touchscreen for quick navigation and control, plus all-new Epson Smart Panel App (1) for enhanced connectivity and productivity from your mobile device.
- Convenient, wireless setup — using a smartphone or mobile device (2) with Bluetooth Low Energy (BLE). Also includes built-in wireless, Wi-Fi Direct (3) and Ethernet networking.
- Seamless scanning — Epson ScanSmart supports easy scanning and editing with a user-friendly interface.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Office Depot LLC | 9.72 | No | No | No |
Small business owners running high-volume workloads need the Epson WorkForce Pro WF-4830 to prevent the constant bottleneck of slow document processing. I was particularly impressed by the PrecisionCore Heat-Free Technology, which manages to deliver fast first-page-out speeds without the typical downtime associated with heat-based systems. The dual 250-sheet trays provide a massive 500-sheet total capacity, meaning you aren't constantly refilling paper mid-job. Navigating the tasks is incredibly intuitive thanks to the 4.3" color touchscreen, and the Epson Smart Panel App makes mobile printing feel seamless. Whether you are utilizing the 50-sheet ADF for multi-page scans or leveraging the auto 2-sided functionality, this machine is built to handle heavy professional demands with high-precision pigment inks.
Canon PIXMA TR7020a All-in-One Wireless Color Inkjet Printer, with Duplex Printing, Mobile Printing, and Auto Document Feeder, Black
Canon PIXMA TR7020a Wireless All-in-One Color Inkjet Printer
- With a 1.44” OLED DISPLAY & LED STATUS BAR easily see and navigate your printer.
- The PIXMA TR7020 has a COMPACT & STYLISH DESIGN that fits your space.
- Great document and photo print quality from 2 CARTRIDGE FINE HYBRID INK SYSTEM.
- EASY SETUP for smartphone and computer and a hassle-free printing experience
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
Your home office desk is finally reclaimed from that bulky, outdated machine thanks to the compact and stylish design of the Canon PIXMA TR7020a. I spent a morning setting this up for a sudden project, and the transition from smartphone to paper was incredibly seamless. The 1.44” OLED display and integrated LED status bar take the guesswork out of troubleshooting, making navigation feel intuitive rather than frustrating. Whether you are churning out high-quality documents via the auto document feeder or printing vibrant photos using the two-cartridge FINE hybrid ink system, the performance remains consistent. It is a reliable, space-saving workhorse that handles duplex printing without a hitch, making it perfect for anyone needing professional results in a smaller footprint.
Epson Workforce WF-2930 Wireless All-in-One Printer with Scan, Copy, Fax, Auto Document Feeder, Automatic 2-Sided Printing and 1.4" Color Display,Blac...
Epson Workforce WF-2930 Wireless All-in-One Printer
- Professional-Quality Home Office Printing — Epson’s leading-edge printing technology delivers sharp text and vibrant color graphics
- Stress-Free Setup and Operation — Features a color display for effortless navigation, plus easy installation and operation through your smartphone or tablet using the Epson Smart Panel app (1)
- Engineered for Reliability — Consistently delivers high-quality prints with heat-free technology and a permanent printhead designed to last the life of the printer
- Convenient Connectivity — Supports easy wireless connections and printing from Android or iOS devices (2)
- Efficient, Economical Design — Automatic 2-sided printing helps you save paper and reduce paper waste
- Easy, Affordable Color Printing — Individual ink cartridges make it easy to only replace the ink you need
- Hands-Free, Voice-Activated Printing — Easily print on-the-go using Alexa, Siri and Google Assistant (3)
- Versatile Functionality — Create searchable PDFs and more with included Epson ScanSmart scanning software
- Epson Printing System Is Designed to Be Used Exclusively with Epson Genuine Cartridges — Use of non-genuine ink could cause damage not covered under the printer’s limited warranty
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | Yes | Yes | Yes |
The Epson Workforce WF-2930 stands out as a powerhouse of efficiency for anyone managing a tight home office space. I was particularly impressed by how the heat-free technology and permanent printhead work together to ensure long-term reliability without the usual maintenance headaches. Navigating tasks is a breeze thanks to the 1.4" color display, though the real magic happens through the Epson Smart Panel app on your phone. Whether you are scanning searchable PDFs with the ScanSmart software or utilizing the auto document feeder for multi-page jobs, this machine handles the heavy lifting. It even supports voice-activated printing via Alexa or Google Assistant, making it one of the most modern, versatile, and economical wireless printers I have tested in this price bracket.
Canon PIXMA All-in-One Wireless Color Inkjet Printer, Print&Copy&Scan, Auto Duplex Printing, 4800 x 1200DPI, Mobile Printing and Airprint, Photo Print...
Canon PIXMA All-in-One Wireless Color Inkjet Printer
- 【Multifunction Printer】The Canon PIXMA Inkjet Printer has printing, copying and scanning functions. All-in-one printer also includes borderless printing, business card printing, 100-sheet rear paper tray, red-eye correction, image cropping and more, meet your basic needs.
- 【High-speed Printing】Fast print speeds up to 8.8 images per minute in black and 5 images per minute in color ensure you never have to wait long for your prints. Print a beautiful borderless 4" x 6" photo in approximately 60 seconds.
- 【High-performance Printing】The Wireless Color Inkjet Printer has four individual ink tanks, four dye-based inks produce vivid color in photos, and the pigment-based black ink produces crisp text. Color resolution of up to 4800x1200 dpi (dots per inch) for producing incredible quality and detail in documents and photos.
- 【Integrated Ink Tanks】Canon all-in-one printer features a highly efficient MegaTank system that's equivalent to 30 conventional ink cartridge sets to let you print up to 6,000 black pages or 7,000 color pages. Clear, front-mounted reservoirs are sleekly integrated into the design so you can easily check your ink levels. With hybrid ink formulations, you can print deeper blacks and vibrant colors for more beautiful results.
- 【Mobile Printing】The wireless all-in-one printer use built-in Wi-Fi Direct to connect your smartphone directly to your wireless laser printer for easy mobile printing, even without a local network connection. Plus, print from your mobile device and from select online cloud services with Canon's free mobile printing app or Google Cloud Print.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Rainbow Office Tech Deal | 9.53 | No | No | No |
The translucent front-mounted ink reservoirs provide an immediate, visual sense of relief by showing you exactly how much fuel you have left before a refill is needed. This Canon PIXMA isn't just a basic document machine. It is a high-capacity powerhouse designed to end the constant cycle of cartridge swapping. Thanks to the integrated MegaTank system, you can churn through thousands of pages—up to 7,000 in color—without breaking a sweat. I found the hybrid ink formulation particularly impressive, delivering crisp, pigment-based black text for professional documents alongside vibrant, dye-based colors for 4x6 photos. Whether you are using Wi-Fi Direct to print straight from your phone or utilizing the auto-duplex feature to save paper, this all-in-one unit handles the heavy lifting of a home office with surprising speed and efficiency.
Canon Pixma MG36 20 Series Wireless All-in-One Color Inkjet Printer - Print Copy Scan - Auto Duplex Printing - Up to 4800 x 1200 dpi Print Resolution...
Canon Pixma MG3620 Wireless All-in-One Color Inkjet Printer
- Print Speed (up to) : Black:ESAT: Approx. 9.9 ipm, Color:ESAT: Approx. 5.7 ipm
- Print Resolution (up to) : Color:Up to 4800 x 1200 dpi, Black:Up to 600 x 600 dpi
- Print on both sides of the page with auto 2-sided print
- 100 Sheets Plain Paper Tray Capacity
- Wireless LAN and Hi-Speed USB Connection【HDMI Cable Included】
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| No | No | No |
Your home office desk is cluttered with school projects and last-minute reports, but this compact red Canon Pixma makes managing the chaos much easier. I found that the auto duplex printing is a genuine lifesaver for saving paper when you are churning through multi-page essays. While the black text prints at a snappy 9.9 ipm, the color output reaches a sharp 4800 x 1200 dpi, which makes photo prints look surprisingly crisp for an inkjet in this class. Setting it up is straightforward thanks to the wireless LAN and the included HDMI cable, giving you flexibility whether you are tethering via USB or printing from across the room. It handles a 100-sheet paper tray well enough for most household needs without taking up excessive space.
Epson Workforce Pro WF-4830 Wireless Color All-in-One Inkjet Printer, Black - Print Scan Copy Fax - 4.3" Touchscreen, 25 ppm, 4800 x 2400 dpi, Auto Du...
Epson WorkForce Pro WF-4830 Wireless All-in-One Printer
- 4-in-1 with Wi-Fi: Print / Copy / Scan / Fax. A fast, all-in-one solution for professional quality, high-volume business printing, the WorkForce Pro WF-4830 All-in-One Inkjet Printer from Epson provides you with the essential functions of printing, scanning, copying, and faxing.
- Using PrecisionCore Heat-Free Technology, users will enjoy sharp prints with a 4800 x 2400 dpi resolution and excellent speeds of up to 25 ppm in black and 12 ppm in color. A variety of different document sizes are easily handled from small 3.5 x 5" cards to large 8.5 x 47.2" banners, and DURABrite Ultra instant-dry pigment inks enable professional-quality prints in borderless sizes up to A4 and 8.5 x 11".
- The printer is also capable of automatic duplex printing and features built-in Wi-Fi for wireless connections to mobile devices where users can connect using the Epson Smart Panel app, Apple AirPrint, Mopria, and more. A 4.3" color touchscreen is provided for quick navigation and control, and comprehensive security features include secure wireless and Secure Data Erase to safeguard your documents.
- For handling media, the WorkForce Pro WF-4830 offers two 250-sheet input trays for a total printing capacity of 500 sheets, and a 35-sheet ADF is provided for scanning and copying. An 8.5 x 11.7" flatbed scanner features an optical resolution of 1200 dpi, ensuring crisp images and copies are produced, and the unit can scan and copy legal size documents up to 8.5 x 14".
- What's in the box: WorkForce Pro WF-4830 printer. Quick setup guide. CD-ROM with drivers. Power cord. 4x DURABrite Ultra Ink cartridges (1x Black ink cartridge and 3x color ink cartridges: 1x Cyan, 1x Magenta, 1x Yellow).
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Triplenet Pricing INC | 9.80 | No | No | No |
Most people assume high-volume office productivity requires a massive, stationary machine, but the Epson WorkForce Pro WF-4830 proves you can pack serious muscle into a compact footprint. I was particularly impressed by how the PrecisionCore Heat-Free technology manages to balance speed and precision, delivering 25 ppm in black without sacrificing that crisp 4800 x 2400 dpi resolution. Whether you are printing large-scale banners or standard documents, the DURABrite Ultra pigment inks ensure everything looks professional and dries instantly. Navigating tasks is a breeze on the 4.3" touchscreen, and the dual 250-sheet trays mean you aren't constantly refilling paper mid-job. It is a robust 4-in-1 workhorse that handles scanning, copying, and faxing with a level of security that actually makes you feel safe handling sensitive business data.
A Guide to Selecting the Best Auto Duplex Inkjet Printers
Understanding Duplexing Mechanisms
When shopping for an auto duplex inkjet printer, the first thing to understand is how the machine handles the paper. Most consumer-grade models use 'automatic duplexing,' where the printer pulls the sheet back into the machine, flips it internally, and prints the second side. It is vital to check if the printer supports single-pass duplexing or reversing duplexing. Single-pass technology is faster and puts less mechanical strain on the paper, whereas reversing duplexing is common in budget models but can occasionally lead to paper jams if the paper weight is too high or the rollers are worn.
Print Speed and Duty Cycle
Duplex printing naturally slows down the overall print process because the machine must pause to re-feed the paper. When comparing specifications, do not just look at the 'Draft' or 'Standard' speeds. Look specifically for the Duplex Print Speed. If you are printing multi-page documents frequently, a printer with a high-speed duplexing engine will save you significant time. Furthermore, consider the monthly duty cycle. A printer designed for heavy-duty duplexing will have more robust paper paths to handle the constant movement of sheets required for double-sided printing.
Ink Management and Cost-per-Page
Because duplex printing encourages longer documents, your ink consumption will increase significantly. A printer that offers automatic double-sided printing is only cost-effective if the ink costs are managed. Look for models that utilize high-capacity ink tanks or large pigment-based cartridges rather than small, disposable cartridges. Pigment inks are particularly beneficial for duplexing because they tend to dry faster and resist smudging when the paper is flipped and fed back through the rollers, ensuring that the reverse side remains crisp and professional.
Paper Handling and Media Compatibility
The quality of your duplexed documents depends heavily on the paper you use. Some printers struggle with thicker cardstock when attempting to flip it automatically. If your workflow involves printing double-sided menus, brochures, or heavy reports, ensure the printer's specifications explicitly state compatibility with various paper weights during duplex operations. A printer with a dedicated rear feed tray is often superior for thicker media, as it provides a straighter paper path, reducing the risk of jams during the flipping process.
Key Decision Logic
To make your final decision, follow this logic: If you are a student or casual user, prioritize a compact footprint and low initial cost, accepting that duplexing may be slightly slower. If you are a professional or small business owner, prioritize ink tank systems for low running costs and high-speed duplexing engines to ensure your productivity remains high even when printing large volumes of double-sided material.
Frequently Asked Questions
Quick answers about Auto Duplex Inkjet Printers before you buy.
Our Auto Duplex Inkjet Printers Rankings
Top 10 Auto Duplex Inkjet Printers Brands on Amazon
Share of top-ranked products by brand, from our rankings.
How We Selected These Products
We compared Auto Duplex Inkjet Printers products using product details and customer ratings to identify the best options in the categories. The top brands in this selection include epson, canon and brother and hp.
From that comparison we shortlisted the top 10 Auto Duplex Inkjet Printers for this page. The sellers featured here include office depot officemax, amazon.com, office depot llc, orangestorm and saveabiz and phototech.
We aim to help you find the right paper products for your needs and save you time when choosing which Auto Duplex Inkjet Printers to buy.
Comparison Table
Compare the top 10 picks at a glance — select a column to sort.