Fill in the details, pick a template and format, download a print-ready certificate. Free REST API included.
/api/certificate — automate certificate generation. No key required.One endpoint. GET the template list, POST the fields to generate a file. No API key.
/api/certificate
templates
List all available certificate templates with their IDs and names.
| Param | Type | Description | |
|---|---|---|---|
| action | string | required | Must be templates |
{
"success": true,
"count": 8,
"templates": [
{ "id": 1, "name": "Modern" },
{ "id": 2, "name": "Dark Background" },
...
]
}
/api/certificate
generate
Generate a certificate and stream the file back directly. Takes 3–8 seconds. Body must be JSON.
| Field | Type | Description | |
|---|---|---|---|
| name | string | required | Recipient's full name |
| date | string | required | Date shown on the certificate |
| signature | string | required | Signing authority name |
| details | string | required | Body text / reason for the certificate |
| templateId | number | required | Template number 1–8 |
| format | string | optional | "pdf" (default), "jpg", or "png" |
| returnUrl | boolean | optional | If true, returns JSON with render URL instead of file stream |
fetch() in code.Content-Type: application/pdf Content-Disposition: attachment; filename="Certificate_Muhammad_Makki_Modern-Ahm7xMakki.pdf" Content-Length: <bytes> X-Template-Name: Modern X-File-Name: Certificate_Muhammad_Makki_Modern-Ahm7xMakki.pdf
{
"success": true,
"renderUrl": "https://...",
"template": "Modern",
"format": "pdf",
"fields": { "name": "Muhammad Makki", "date": "01/01/2025", "signature": "Dr. Smith" }
}
| ID | Name |
|---|
Yes — 100% free. No sign-up, no subscription, no credits, no limits on normal use. The API is also completely free with no key.
Three: pdf (default, print-ready), jpg, and png. Pick the one you need in the generator or via the format POST field.
Eight — spanning modern, dark, classic, green, red-and-yellow, golden elegant, blue simple, and golden-and-green styles. Preview them in the picker or via GET /api/certificate?action=templates.
Yes, for legitimate personal and business use. Do not use CertSter to forge official credentials or misrepresent qualifications — see the terms of use.
Typically well under 1 MB for PDF and 300–800 KB for high-resolution PNG/JPG, depending on the template.
Yes. Click API Docs to see the single endpoint (/api/certificate) with parameter tables and cURL/JavaScript examples. No API key required.
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CertSter is a free certificate generator by AHM7xMakki — part of a 16-tool free API platform. Owned by AHM7. Built and managed by Makki. About us →
No account required. Field data is used only to render the certificate — nothing is stored server-side beyond the request. Full policy →
For legitimate personal and business use. Do not use CertSter to forge credentials or misrepresent qualifications. Fair-use limits apply. Full terms →
CertSter by AHM7xMakki generates professional print-ready certificates instantly. Eight templates, PDF/JPG/PNG output, free REST API — no sign-up, no key.