diagrams.net is the best first choice for most people who want a free tool for flowcharts, network maps, and org charts—especially if offline work and control over where files are saved matter. Lucidchart is a more guided cloud option with documented support for all three diagram types, but its free plan has document and object limits. Miro works for small collaborative projects that fit within three editable boards. Visio is worth considering if your organization already provides an eligible Microsoft 365 subscription, but its included version is not a full substitute for paid Visio plans.
How to choose a free diagramming tool
“Free” can mean a standalone app, a limited free plan, or a feature included with a subscription you already have. Before choosing, match the tool to the diagram and the way you plan to maintain it.
- Diagram type: Check that the version you can use supports the specific flowchart, network notation, or org chart you need.
- Free-plan limits: Compare editable boards, documents, objects, and storage where the vendor publishes those limits.
- File handling: Consider whether you need offline access and whether you can choose where diagrams are stored.
- Org-chart upkeep: A chart created from imported data is not necessarily refreshed automatically when that data changes.
- Collaboration and subscription: Decide whether shared editing is essential and whether you already have an eligible Microsoft 365 plan.
The available vendor documentation does not establish equivalent feature-by-feature performance across these products, so the best fit depends on these practical requirements rather than a universal ranking.
Best free diagramming software compared
| Tool | What “free” means | Flowcharts | Network maps | Org charts | Key limitation or strength |
|---|---|---|---|---|---|
| diagrams.net | Free web app and desktop app | Not specifically enumerated in the cited source | Not specifically enumerated in the cited source | Not specifically enumerated in the cited source | Offline diagramming; you choose the storage location |
| Lucidchart | Limited free plan | Supported; templates and a shape library are documented | Supported; vendor documents network mapping and cloud-provider shape libraries | Supported; chart creation and data import are documented | Free documents and objects are limited; org-chart data refresh is not included |
| Miro | Free plan | Basic flowchart elements are free | Not established by the cited materials | Not established by the cited materials | Free workspace allows three editable boards |
| Visio in Microsoft 365 | Included for eligible Microsoft 365 business subscribers | Basic flow charts are supported | Not equivalent to the richer network support in paid plans | Partially supported in the basic offer | Subscription-dependent; advanced diagram features require paid plans |
diagrams.net: the strongest free starting point
diagrams.net offers a free web application and a desktop app for Linux, Windows, and macOS. Its official white paper says diagrams can be created offline and that users choose the cloud storage platform or device where diagram files are saved. That makes it a useful first candidate if you want to work without an internet connection or decide where your files live. diagrams.net’s offline documentation
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#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
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The cited official material does not enumerate its current shape libraries or establish every advanced network- or org-chart feature. If your work depends on specialized notation or a particular chart workflow, confirm that capability in the current product before committing to it.
Lucidchart: a cloud option for all three diagram types
Lucid documents flowchart creation using templates or its flowchart shape library, and lists Free among its supported plans. It also describes network mapping with shape libraries for providers such as AWS, Azure, and Google Cloud. Its org-chart documentation covers chart creation and importing data from CSV, Excel, or Google Sheets. Flowcharts, network diagrams, org charts, and org-chart data imports.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Free access is bounded: Lucid’s plan comparison describes document and object limits on the Free plan. It also lists org-chart data refresh as unavailable on Free, Individual, and Team plans, with refresh available on Enterprise. You can create a chart or import data on a free plan, but should not expect the chart to keep refreshing from a changing source automatically. Check Lucid’s plan comparison for the current limits; it was last updated August 14, 2026, and plan terms can change.
Miro: collaborative diagrams within a small board allowance
Miro says basic shapes, flowcharts, and connectors are free on every plan. Its free workspace allows three editable boards, which can suit a small set of shared diagrams but may be restrictive if you need to maintain many separate projects in one workspace. Miro’s diagramming overview and pricing page.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
The cited Miro materials establish its free flowchart elements and board limit, but do not establish support for network maps or org charts. Verify those specific needs rather than assuming that a general diagramming feature covers them.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Visio: free only if it comes with your subscription
Visio in Microsoft 365 is a lightweight, web-based version available to eligible Microsoft 365 business subscribers for basic diagrams, including flow charts. It is not a free standalone product. Microsoft says the included version lacks features needed for more complex diagram types; its comparison distinguishes basic flows from richer network and org-chart capabilities associated with paid plans, and describes org charts in the basic offer as only partially supported. Visio in Microsoft 365, Microsoft’s feature overview, and plan comparison.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Which option fits your situation?
- Start with diagrams.net if a free standalone tool, offline work, or choosing your storage location is important. Confirm any specialized diagram features you require.
- Choose Lucidchart if you want documented support across flowcharts, network diagrams, and org charts in a cloud tool, and its free document and object limits are sufficient. For regularly updated org charts, note that data refresh is an Enterprise feature.
- Choose Miro if collaboration is central and your free workspace can stay within three editable boards; the cited material confirms basic flowchart support, not network-map or org-chart coverage.
- Use Visio in Microsoft 365 if you already have an eligible business subscription and need basic diagrams. Check the paid-plan comparison if your work depends on richer network diagrams or complete org-chart support.
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