Technical diagrams
System architecture diagram template
Clients, API gateway, services, databases and a message queue.
Free diagram maker for every kind of diagram
From a quick Venn diagram to a system architecture overview, SketchFlow is a free diagram maker that covers the everyday diagrams people need for work and study. Start from a template, change the labels and export a clean PNG or SVG.
What makes a good diagram?
A diagram turns relationships into a picture: how parts connect, how data flows, how causes lead to effects. A good diagram replaces paragraphs of explanation with something people understand at a glance.
Why SketchFlow
- Templates for technical, business and study diagrams.
- Arrows with labels, dashed styles and three routing modes.
- Group, lock, align and layer elements to keep complex diagrams tidy.
- SVG export stays sharp in documents and slides at any size.
How to use SketchFlow as a diagram maker
- Step 1: Pick a template close to what you need, or start on a blank board.
- Step 2: Add shapes with R, E and D and place them roughly where they belong.
- Step 3: Connect related shapes with A; add labels next to arrows with T.
- Step 4: Group parts that belong together with Ctrl/Cmd+G.
- Step 5: Export as SVG for documents or PNG for chat and tickets.
Templates for this
Open one on the board, or read how to adapt it first.
Technical diagrams
ER diagram template
Entities, key fields and one-to-many relationships for a shop database.
Technical diagrams
Sequence diagram template
A login request traced across user, browser, API and database lifelines.
Strategy & business
SWOT analysis template
Strengths, weaknesses, opportunities and threats in a 2×2 grid.
Strategy & business
Fishbone (cause & effect) diagram template
An Ishikawa diagram with six cause categories feeding one problem.
Mind maps & concept maps
Venn diagram template
Three overlapping circles to compare sets and find what they share.
Frequently asked questions
Which diagram types can I make?
Anything built from boxes, circles, diamonds, arrows and text: flowcharts, architecture, ER and sequence-style diagrams, SWOT, fishbone, Venn, sitemaps and more.
Can I export a transparent background?
Yes. Switch off the background option before you export, and the PNG or SVG keeps only your drawing.
Does it support UML?
You can draw UML-style diagrams with the basic shapes, but there are no dedicated UML symbols or validation.