Free tools
Heat map generator
Drop a CSV with lat/lng columns and we'll render a density heatmap instantly — no installs, no API key. For per-point detail with filters and tooltips, use MapsMaker.
1,200+
Maps created
85k+
Locations mapped
<5 min
Avg. setup time
From CSV to heatmap in 10 seconds
Drop a CSV and instantly see density patterns.
- Upload a CSV with lat + lng columns
- Auto-detects column names (lat/latitude, lng/longitude)
- Heatmap renders in your browser — no API key, no install
When a heatmap helps
Use heatmaps to spot density patterns without manual analysis.
- Customer or sales rep distribution
- Issue/incident density (where do problems cluster?)
- Foot traffic or visit logs
Heatmap vs cluster
Both handle dense data, but show different things.
- Heatmap: density (color intensity = many points nearby)
- Cluster: count (bubble shows N points grouped)
- Use heatmap to spot hotspots, cluster to see exact counts
Frequently asked questions
How many points?
Tested up to ~50,000 in-browser. For more, build the map in MapsMaker.
Can I see individual points?
Heatmap shows density, not individual markers. Use a pin map or CSV-to-map for per-point detail.
Can I tune the colors?
v1 uses a standard heat gradient. MapsMaker offers gradient customization.
Does it require an API key?
No — no key needed.
Is this tool free?
Yes — no signup required.
Will the CSV be saved?
No — processing is in-browser and the file is not uploaded to any server.
Save it as a real map
MapsMaker is where you publish and embed interactive maps.