Code 39 Barcode for Swimming Pool API
Generate code 39 barcode for swimming pools and aquatic centers with a single API call. ChartQuery renders publication-ready images, PNG or SVG, that you can embed in dashboards, emails, reports, or print directly. No chart library to install, no frontend code to write.
Live Preview
This image is generated in real time by the ChartQuery API, no static assets.
Quick Start
A single HTTP request is all you need. No SDK, no dependencies.
curl "https://api.chartquery.com/v1/barcode?data=CODE39-DEMO&type=code39&show_text=true" \
--output barcode.svgHow It Works
Send a Request
POST a JSON body or use GET with query parameters. No SDK or library needed.
Get Your Image
ChartQuery renders your chart, diagram, barcode, QR code, or label and returns it as PNG or SVG.
Use It Anywhere
Embed in emails, PDFs, dashboards, documents, or print directly. Works everywhere images work.
Features
25+ Barcode Formats
EAN-13, UPC-A, Code 128, GS1-128, ITF-14, and 20+ more standards, all from one endpoint.
Print-Ready Output
SVG and PNG output with configurable DPI, units (px, mm, in, cm), and precise bar width control.
Full Styling Control
Customize colors, margins, text position, rotation, font, and bearer bars for any requirement.
Industry Compliance
Generate GS1-compliant barcodes with Application Identifiers for retail, logistics, and healthcare.
Swimming Pool Use Cases
- Track daily visitor counts
- Generate member pass barcodes
- Create QR codes for lane booking
- Visualize seasonal attendance patterns
Frequently Asked Questions
What is a Code 39 Barcode API for Swimming Pool?
A Code 39 Barcode API for swimming pools and aquatic centers lets you generate code 39 barcode images programmatically via HTTP requests. ChartQuery renders publication-ready PNG or SVG output that you can embed in dashboards, emails, reports, or print, without installing any chart library or writing frontend code.
How do I generate a code 39 barcode for swimming pool with an API?
Send a POST request to the ChartQuery barcode endpoint with your data as JSON. The API returns a rendered image directly. You can also use GET requests with URL parameters for simple cases. No API key is required for basic usage, anonymous access is available with 60 requests per hour.
What output formats does the Code 39 Barcode API support?
SVG (default) and PNG. SVG is lossless and scalable, while PNG is a lossless raster format ideal for email and PDF.
Is the Code 39 Barcode API free to use?
Yes. The ChartQuery Code 39 Barcode API works without an API key. Anonymous access is rate-limited to 60 requests per hour and adds a small watermark. Authenticated users on paid plans get higher limits, no watermark, and longer chart persistence (6 months vs 3 days for shared URLs).
What are common code 39 barcode use cases in swimming pool?
Track daily visitor counts. Generate member pass barcodes. Create QR codes for lane booking. Visualize seasonal attendance patterns. ChartQuery handles the rendering so you can focus on your data and business logic.
Can I share and embed barcodes generated by the API?
Yes. Add "share": true to any request to get permanent URLs. The render_url is a direct image URL you can embed in emails, documents, or <img> tags. The view_url is an interactive HTML page you can embed as an iframe. No authentication needed for viewers.
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