WebP Converter transforms WebP images to classic formats like PNG and JPG, or converts other formats to WebP for better compression. Essential for handling modern web images.
Try it — live request, no key required
No key required to try it. Get a key to use it in your app.
{
"status": "ok",
"error": null,
"data": {
// WebP Converter response payload
}
}
About the WebP Converter API
WebP is Google's modern image format offering superior compression. While most browsers support it, some applications and platforms don't. This API converts between WebP and traditional formats seamlessly.
Ways to call it
One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.
- JSON
- Default REST response
- XML
- Markup format
- YAML
- Human-readable
- CSV
- Tabular export
- GraphQL
- Query language
- MCP
- For AI agents
What does the WebP Converter API do?
How do I authenticate WebP Converter API requests?
How much does the WebP Converter API cost?
How fast is the WebP Converter API?
What response formats does the WebP Converter API support?
What HTTP method does the WebP Converter API use?
Request parameters — POST /v1/webpconverter
Sent as JSON in the request body. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.
Required
| Parameter | Type | Example | Description |
|---|---|---|---|
imageRequired | string | Upload an image file to convert (supported formats: WebP, PNG, JPG, GIF) | |
outputFormatRequired | string | png | Target formatpngjpgwebpgiftiff |
Optional
| Parameter | Type | Example | Description |
|---|---|---|---|
qualityOptional | integer | 90 | Output quality (applies to jpg/webp) default 90 · range 1-100 |
maxWidthOptionalPremium | integer | 1920 | Maximum width in pixels (maintains aspect ratio) range 1-10000 |
maxHeightOptionalPremium | integer | 1080 | Maximum height in pixels (maintains aspect ratio) range 1-10000 |
curl -X POST "https://api.apiverve.com/v1/webpconverter" \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"outputFormat":"png","quality":90,"maxWidth":1920,"maxHeight":1080}'Authentication
Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.
| Header | When | Value |
|---|---|---|
x-api-keyRequired | Every request | Your API key. Header names are case-insensitive, so X-API-Key is the same header. |
AuthorizationAlternate | Instead of the above | Bearer <key> — for clients that only expose bearer auth. Resolves to the same account and the same billing. |
content-typeRequired | POST body | application/json |
A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.
Response — POST /v1/webpconverter
Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.
{
"status": "ok",
"error": null,
"data": {
"id": "c9d8e7f6-5432-10ba-dcfe-210987654321",
"inputFormat": "webp",
"outputFormat": "png",
"inputSize": 156789,
"outputSize": 234567,
"mimeType": "image/png",
"expires": 1707350400000,
"downloadURL": "https://storage.googleapis.com/apiverve/webpconverter/c9d8e7f6.png"
},
"code": 200
}
Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
idPremium | string | "c9d8e7f6-5432-10ba-dcfe-210987654321" | Unique identifier for conversion request |
inputFormat | string | "webp" | Format of uploaded input image file |
outputFormat | string | "png" | Format of converted output image file |
inputSizePremium | number | 156789 | Size of input image in bytes |
outputSizePremium | number | 234567 | Size of converted output image bytes |
mimeType | string | "image/png" | MIME type of converted output image |
expires | number | 1707350400000 | Unix timestamp when converted image expires |
downloadURL | string | "https://storage.googleapis.com/apiverve/webpconverter/c9d8e7f6.png" | URL to download converted image file |
Response headers
Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.
| Header | What it carries |
|---|---|
x-api-remaining-credits | Credits left in the current cycle |
x-api-credits-used | Credits spent in the current cycle |
x-api-max-credits | The allowance for the cycle |
x-api-version | Version of the endpoint that answered |
Errors
Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.
| Status | Meaning | What to do |
|---|---|---|
400 | Input was rejected | Read error; it names the parameter that has to change. |
401 | Key missing or invalid | Check the header name and the key value. |
403 | Key valid, but not permitted here | A key restriction or an IP allow-list — never a bad key. |
429 | Rate limited, or out of credits | Read error to tell them apart, then back off or top up. |
What a call costs — 10 credits per call
Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.
| Plan | Per month | Credits | WebP Converter calls | Per 1,000 calls |
|---|---|---|---|---|
| Free | Free | 200 | 20 | Free |
| Starter | $29.99 | 200,000 | 20,000 | $1.50 |
| Pro | $99.99 | 1,000,000 | 100,000 | $1.00 |
| Mega | $299.99 | 4,000,000 | 400,000 | $0.75 |
Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.
Call it from cURL — POST /v1/webpconverter
No SDK to install — this is a plain HTTPS call to /v1/webpconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.
curl "https://api.apiverve.com/v1/webpconverter" \
-H "x-api-key: YOUR_API_KEY"Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Node.js — POST /v1/webpconverter
Install the Node.js SDK, then call the WebP Converter API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
npm install @apiverve/webpconverterconst res = await fetch("https://api.apiverve.com/v1/webpconverter", {
headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Python — POST /v1/webpconverter
No SDK to install — this is a plain HTTPS call to /v1/webpconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.
import requests
res = requests.get(
"https://api.apiverve.com/v1/webpconverter",
headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from C# / .NET — POST /v1/webpconverter
Install the C# / .NET SDK, then call the WebP Converter API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.
dotnet add package APIVerve.API.WebPConverterusing var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");
var json = await client.GetStringAsync("https://api.apiverve.com/v1/webpconverter");
Console.WriteLine(json);Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Go — POST /v1/webpconverter
No SDK to install — this is a plain HTTPS call to /v1/webpconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/webpconverter", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from PHP — POST /v1/webpconverter
No SDK to install — this is a plain HTTPS call to /v1/webpconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.
$ch = curl_init("https://api.apiverve.com/v1/webpconverter");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);
$response = curl_exec($ch);
echo $response;Resources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Call it from Ruby — POST /v1/webpconverter
No SDK to install — this is a plain HTTPS call to /v1/webpconverter with your key in the x-api-key header. Swap in a real key and it runs as-is.
require "net/http"
uri = URI("https://api.apiverve.com/v1/webpconverter")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"
res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.bodyResources
Also published for
Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.
Zero-code embed — one snippet, no backend
Drop an interactive WebP Converter form onto any page. The widget calls the API for you, so no key ever appears in your markup and there is nothing to deploy.
Changelog — WebP Converter API
Every change to this endpoint, newest first. Breaking changes ship as a new version and the previous one keeps serving — response fields are added, never removed or retyped in place, so an integration written against v1 keeps working.
Entries are picked up from dated catalog snapshots, so the first one appears after the next snapshot that moves something. A period where nothing changed produces no entry — silence is a valid changelog for the WebP Converter API.
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