Fishbone Diagram Maker (Ishikawa)
Build a cause-and-effect diagram for root cause analysis. Edit categories and causes and the diagram updates live, fully editable on mobile. Includes lab report, healthcare and business templates. Pro Mode adds sub-causes, custom colors and PDF export.
Apply a color theme to every category at once, or click any category's color swatch above to set it individually.
Paste an outline, one category per line ending in a colon, causes separated by commas. Example:
Materials: Expired reagent, Wrong concentration
Methods: Skipped step, Wrong temperature
How to Use the Fishbone Diagram Maker
From a blank problem statement to a completed root cause analysis. Fully editable on mobile.
Everything above runs entirely in your browser. Your diagram is never uploaded to a server, so it stays completely private from start to finish.
Fishbone Diagram Maker (Ishikawa), Free and Online
A fishbone diagram maker organises the possible causes of a problem into categories along a fish-shaped skeleton, so a team can spot patterns during root cause analysis. This one is fully editable on mobile, includes lab, healthcare and business templates, and runs entirely in your browser.
A problem written as a single sentence hides how many different factors could actually be behind it, which is exactly the gap the fishbone diagram closes. Instead of guessing at one cause, you sort every plausible factor into categories along the bones of a fish, with the problem itself sitting at the head. This free fishbone diagram generator tool lets you type your problem into the Effect box, load a ready-made template for a lab report, a healthcare process review or a general business issue, and add causes under each category as the diagram updates live. Reorder categories with the up and down arrows, which work identically on touch and mouse. Export the finished diagram as a PNG. Pro Mode adds sub-causes nested under each cause, custom colours per category, bulk import from a pasted outline, and export to SVG, PDF and JSON.
1Simple vs Pro, What Each Mode Includes
| Feature | Simple Mode | Pro Mode (Free) |
|---|---|---|
| Business and blank templates | Included | Included |
| Up to 6 categories, 6 causes each | Included | Included |
| Live diagram preview, export as PNG | Included | Included |
| Lab, Healthcare, Service and Manufacturing (8M) templates | Not included | Included |
| Up to 10 categories, 10 causes each, plus sub-causes | Not included | Included |
| Custom colours, 5 colour themes | Not included | Included |
| Bulk import, save and load as JSON | Not included | Included |
| Export as SVG or PDF | Not included | Included |
2Common Category Sets
These category sets exist to stop a team from only exploring the causes that come to mind first. A quality issue on a production line might feel like an equipment problem at first glance, but working through Methods, Materials and Manpower as well often surfaces a contributing factor nobody would have raised unprompted. The categories are a starting point, not a rule, and renaming or replacing them to fit the actual context, a lab experiment, a hospital process, a delayed shipment, is expected and encouraged.
3Where the Fishbone Diagram Actually Came From
The diagram is named after Kaoru Ishikawa, a Japanese quality control professor at the University of Tokyo, though sources genuinely differ on exactly when he first used it, some place its earliest known use at the Kawasaki shipyards as far back as 1943, while others date his teaching version to the early 1950s, a discrepancy documented by Art of Lean's reference entry on the Ishikawa diagram. What is well established is that Joseph Juran named it the Ishikawa diagram in his 1962 Quality Control Handbook, and Ishikawa himself formalised it as one of seven basic quality tools in his 1968 book, Guide to Quality Control, the publication that actually spread it across Japanese industry and, eventually, the rest of the world.
| Question | Quick Answer |
|---|---|
| What goes in the fish's head? | The specific problem, or Effect, being analysed |
| What do the bones represent? | Categories of potential causes |
| What do the ticks on each bone represent? | Individual causes within that category |
| Who named it the Ishikawa diagram? | Joseph Juran, in his 1962 Quality Control Handbook |
Everything, including Pro Mode's sub-causes, custom colours and bulk import, runs entirely in your browser using JavaScript. Your diagram is saved only in local storage on your own device, and is never sent to a server.
4Frequently Asked Questions
Grounded in the documented Ishikawa, Juran and 1968 publication timeline, including the genuine disagreement over the exact founding date, not a flattened one-date origin story. The full account is detailed on Art of Lean's Ishikawa diagram reference. For related process and diagram tools on the rest of this site, see the WBS Generator and the full SmallStudyTools.com tool library.
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