Gotenberg

https://gotenberg.dev/docs
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Gotenberg is a stateless API for converting HTML, Markdown, and Office documents to PDF and other...
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### Quick Start: Run Gotenberg container and convert URL to PDF

Source: https://gotenberg.dev/docs/getting-started/introduction

Two commands to get started: start the Gotenberg container with Docker, then use curl to POST a URL to the Chromium conversion endpoint and save the PDF as invoice.pdf.

```bash
# 1. Start the container.  

docker run --rm -p "3000:3000" gotenberg/gotenberg:8  

# 2. Convert a URL to PDF.  

curl \  

--request POST http://localhost:3000/forms/chromium/convert/url \  

--form url=https://sparksuite.github.io/simple-html-invoice-template/ \  

-o invoice.pdf  
```

--------------------------------

### Dockerfile for Gotenberg 8.23.1 and after (German locale)

Source: https://gotenberg.dev/docs/configuration

Use this Dockerfile to build a Gotenberg image with German language support for LibreOffice conversions. It installs the libreoffice-l10n-de package from trixie-backports, enables the de_DE.UTF-8 locale, and sets LANG, LANGUAGE, and LC_ALL environment variables. The USER is switched back to gotenberg after the setup.

```dockerfile
FROM gotenberg/gotenberg:8  

USER root  

RUN apt-get update -qq &&\
    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends -t trixie-backports libreoffice-l10n-de &&\
    sed -i '/de_DE.UTF-8/s/^# //g' /etc/locale.gen &&\
    locale-gen &&\
    # Cleanup.  
    # Note: the Debian image does automatically a clean after each install thanks to a hook.  
    # Therefore, there is no need for apt-get clean.  
    # See https://stackoverflow.com/a/24417119/3248473.  
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*  

ENV LANG de_DE.UTF-8  
ENV LANGUAGE de_DE:de  
ENV LC_ALL de_DE.UTF-8  

USER gotenberg  
```

--------------------------------

### GET /debug

Source: https://gotenberg.dev/docs/system/debug

Returns the runtime configuration, active modules, and dependency versions (Chromium, LibreOffice). Useful for troubleshooting and verifying startup flags.

```APIDOC
## GET /debug

### Description
Returns the runtime configuration, active modules, and dependency versions (Chromium, LibreOffice). Useful for troubleshooting and verifying startup flags.

### Method
GET

### Endpoint
/debug

### Headers
- **Gotenberg-Trace** (string) - Optional - A custom request ID to identify the request in the logs; overrides the default UUID.

### Request Example
```
curl --request GET http://localhost:3000/debug
```

### Response
#### Success Response (200)
Returns the runtime configuration, active modules, and dependency versions.

#### Response Example
See https://demo.gotenberg.dev/debug for details.

```

--------------------------------

### GET /debug

Source: https://gotenberg.dev/docs/getting-started/routes

Dumps the runtime configuration.

```APIDOC
## GET /debug

### Description
Dumps the runtime configuration.

### Method
GET

### Endpoint
/debug

### Response
#### Success Response (200)
- Returns the runtime configuration dump.

```

--------------------------------

### Docker: Bind to localhost for secure setup

Source: https://gotenberg.dev/docs/getting-started/installation

Runs Gotenberg with the port bound to localhost only, preventing external access. This is a more secure setup than the default.

```bash
docker run --rm -p "127.0.0.1:3000:3000" gotenberg/gotenberg:8
```

--------------------------------

### Dockerfile: Install Microsoft Core Fonts

Source: https://gotenberg.dev/docs/configuration

Build a custom Docker image to install Microsoft Core Fonts (ttf-mscorefonts-installer). Accepts the Microsoft EULA via debconf-set-selections and adds the contrib/non-free Debian repository. Run as root, then switch back to the gotenberg user.

```dockerfile
FROM gotenberg/gotenberg:8  

USER root  

RUN echo "deb http://deb.debian.org/debian trixie contrib non-free" \
      > /etc/apt/sources.list.d/contrib.list \
    && echo "ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true" \
      | debconf-set-selections \
    && apt-get update -qq \
    && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
         ca-certificates \
         wget \
         ttf-mscorefonts-installer \
    && rm -rf /var/lib/apt/lists/*  

USER gotenberg  
```

--------------------------------

### Example Request: cURL to /forms/chromium/screenshot/markdown

Source: https://gotenberg.dev/docs/convert-with-chromium/screenshot-markdown

Sends a POST request with the index.html and markdown files to the screenshot endpoint. The output is saved as my.png.

```bash
curl \  

--request POST http://localhost:3000/forms/chromium/screenshot/markdown \  

--form files=@/path/to/index.html \  

--form files=@/path/to/file.md \  

-o my.png  
```

--------------------------------

### Dockerfile for Gotenberg prior to 8.22.0 (German locale)

Source: https://gotenberg.dev/docs/configuration

Use this Dockerfile for Gotenberg versions up to 8.22.0 to enable German language support. It installs libreoffice-l10n-de from bookworm-backports, enables the de_DE.UTF-8 locale, and sets the same environment variables. The USER is switched back to gotenberg after the setup.

```dockerfile
FROM gotenberg/gotenberg:8  

USER root  

RUN apt-get update -qq &&\
    DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends -t bookworm-backports libreoffice-l10n-de &&\
    sed -i '/de_DE.UTF-8/s/^# //g' /etc/locale.gen &&\
    locale-gen &&\
    # Cleanup.  
    # Note: the Debian image does automatically a clean after each install thanks to a hook.  
    # Therefore, there is no need for apt-get clean.  
    # See https://stackoverflow.com/a/24417119/3248473.  
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*  

ENV LANG de_DE.UTF-8  
ENV LANGUAGE de_DE:de  
ENV LC_ALL de_DE.UTF-8  

USER gotenberg  
```

--------------------------------

### Run Gotenberg with CLI flag using Docker CLI

Source: https://gotenberg.dev/docs/configuration

Starts a Gotenberg container with the --my-module-property=foo flag. Override the command, not the entrypoint.

```bash
docker run --rm -p "3000:3000" gotenberg/gotenberg:8 gotenberg --my-module-property=foo
```

--------------------------------

### 200 OK response with metadata JSON

Source: https://gotenberg.dev/docs/manipulate-pdfs/read-metadata

Successful response returns JSON with metadata for each file. The example shows metadata for invoice.pdf and report.pdf.

```json
Content-Type: application/json; charset=UTF-8  

Content-Length: {content-length}  

Gotenberg-Trace: {trace}  

Body:  

{  

  "invoice.pdf": {  

    "PDFVersion": 1.7,  

    "Author": "Gotenberg",  

    "Title": "Invoice #001",  

    "CreateDate": "2024:03:05 09:15:32Z",  

    "PageCount": 2,  

    "Producer": "Gotenberg",  

    "MIMEType": "application/pdf"  

  },  

  "report.pdf": {  

    "PDFVersion": 1.4,  

    "Author": "John Doe",  

    "PageCount": 15  

    // ...  

  }  

}
```

--------------------------------

### Dockerfile: Install Specialized Script Fonts

Source: https://gotenberg.dev/docs/configuration

Build a custom Docker image to install specialized script fonts, such as fonts-hosny-amiri and fonts-thai-tlwg, for richer glyph sets beyond the basic Noto coverage. Run as root, then switch back to the gotenberg user.

```dockerfile
FROM gotenberg/gotenberg:8  

USER root  

RUN apt-get update -qq \
    && DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
        fonts-hosny-amiri \
        fonts-thai-tlwg \
    && rm -rf /var/lib/apt/lists/*  

USER gotenberg  
```

--------------------------------

### Run Gotenberg with environment variable using Docker CLI

Source: https://gotenberg.dev/docs/configuration

Starts a Gotenberg container with the MY_MODULE_PROPERTY=foo environment variable.

```bash
docker run --rm -p "3000:3000" -e MY_MODULE_PROPERTY=foo gotenberg/gotenberg:8
```

--------------------------------

### Correct HTML Asset Reference

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Correct HTML example that references an uploaded asset (logo.png) by filename only, as required by Gotenberg's flat directory storage.

```html
<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8" />

  <title>My PDF</title>

</head>

<body>

  <h1>Hello world!</h1>

  <img src="logo.png" />

</body>

</html>
```

--------------------------------

### Template Configuration: index.html with {{ toHTML "file.md" }}

Source: https://gotenberg.dev/docs/convert-with-chromium/screenshot-markdown

The index.html file must include the Go template action {{ toHTML "file.md" }} where the Markdown content should appear. This template is required for the conversion.

```html
<!DOCTYPE html>  

<html lang="en">  

  <head>  

    <meta charset="utf-8" />  

    <title>My PDF</title>  

  </head>  

  <body>  

    {{ toHTML "file.md" }}  

  </body>  

</html>  
```

--------------------------------

### cURL request to GET /health

Source: https://gotenberg.dev/docs/system/get-health-check

Sends a GET request to the health check endpoint. Returns 200 when healthy, 503 when unhealthy.

```bash
curl --request GET http://localhost:3000/health  
```

--------------------------------

### Convert Markdown to PDF with emulatedMediaType=screen

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-markdown-to-pdf

Sends a POST request to emulate screen media type instead of the default print, making the PDF match the browser viewport. The output is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/markdown \

--form files=@/path/to/index.html \

--form files=@/path/to/file.md \

--form emulatedMediaType=screen \

-o my.pdf
```

--------------------------------

### cURL request to GET /version

Source: https://gotenberg.dev/docs/system/version

Sends a GET request to the /version endpoint to retrieve the Gotenberg version. Useful for verifying deployments.

```bash
curl --request GET http://localhost:3000/version  
```

--------------------------------

### Convert HTML to PDF with emulatedMediaFeatures

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Sends a POST request with emulatedMediaFeatures as a JSON array to override CSS media features, forcing dark mode and reduced motion. The output is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/html \

--form files=@/path/to/index.html \

--form emulatedMediaFeatures='[{"name": "prefers-color-scheme", "value": "dark"}, {"name": "prefers-reduced-motion", "value": "reduce"}]' \

-o my.pdf
```

--------------------------------

### Convert HTML to PDF with emulatedMediaType=screen

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Sends a POST request to emulate screen media type instead of the default print, making the PDF match the browser viewport. The output is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/html \

--form files=@/path/to/index.html \

--form emulatedMediaType=screen \

-o my.pdf
```

--------------------------------

### Convert Markdown to PDF with printBackground=true

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-markdown-to-pdf

Sends a POST request to include background graphics and colors in the PDF by setting printBackground=true. The output is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/markdown \

--form files=@/path/to/index.html \

--form files=@/path/to/file.md \

--form printBackground=true \

-o my.pdf
```

--------------------------------

### Stamp Options JSON Example

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Example stampOptions JSON for PDF engine stamping. Keys depend on the configured PDF engine (pdfcpu default or pdftk).

```json
{  

  "font": "Helvetica",  

  "points": 24,  

  "color": "#008000",  

  "rotation": 0,  

  "opacity": 0.6  

}  

```

--------------------------------

### Convert Markdown to PDF with emulatedMediaFeatures

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-markdown-to-pdf

Sends a POST request to override CSS media features, emulating dark mode and reduced motion. The emulatedMediaFeatures field expects a JSON array of objects with name and value. The output is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/markdown \

--form files=@/path/to/index.html \

--form files=@/path/to/file.md \

--form emulatedMediaFeatures='[{"name": "prefers-color-scheme", "value": "dark"}, {"name": "prefers-reduced-motion", "value": "reduce"}]' \

-o my.pdf
```

--------------------------------

### Watermark Options JSON Example

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Example watermarkOptions JSON for PDF engine watermarking. Keys depend on the configured PDF engine (pdfcpu default or pdftk).

```json
{  

  "font": "Helvetica",  

  "points": 48,  

  "color": "#808080",  

  "rotation": 45,  

  "opacity": 0.15  

}  

```

--------------------------------

### cURL request to GET /prometheus/metrics

Source: https://gotenberg.dev/docs/system/prometheus-metrics

Sends a GET request to the Prometheus metrics endpoint. The endpoint is deprecated as of Gotenberg 8.29.0; use OpenTelemetry instead. The response status is 200 on success.

```bash
curl --request GET http://localhost:3000/prometheus/metrics  
```

--------------------------------

### cURL request to GET /debug

Source: https://gotenberg.dev/docs/system/debug

Sends a GET request to the /debug endpoint to retrieve runtime configuration and module details. Requires API_ENABLE_DEBUG_ROUTE=true. Optionally include the Gotenberg-Trace header for a custom request ID.

```bash
curl --request GET http://localhost:3000/debug  
```

--------------------------------

### Convert HTML to PDF with printBackground

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Sends a POST request to include background graphics and colors in the PDF by setting printBackground to true. The output is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/html \

--form files=@/path/to/index.html \

--form printBackground=true \

-o my.pdf
```

--------------------------------

### GET /health

Source: https://gotenberg.dev/docs/getting-started/routes

Health check endpoint.

```APIDOC
## GET /health

### Description
Health check endpoint.

### Method
GET

### Endpoint
/health

### Response
#### Success Response (200)
- Returns a simple health status.

```

--------------------------------

### Live Demo: curl request to demo.gotenberg.dev

Source: https://gotenberg.dev/docs/getting-started/installation

Sends a POST request to the Gotenberg demo instance to convert a URL to PDF. The demo runs on a Render instance with rate limits: 2 requests/second per IP and a 5MB body limit.

```bash
curl \
  --request POST https://demo.gotenberg.dev/forms/chromium/convert/url \
  --form url=https://sparksuite.github.io/simple-html-invoice-template/ \
  -o my.pdf
```

--------------------------------

### GET /version

Source: https://gotenberg.dev/docs/getting-started/routes

Returns the version of the Gotenberg service.

```APIDOC
## GET /version

### Description
Returns the version of the Gotenberg service.

### Method
GET

### Endpoint
/version

### Response
#### Success Response (200)
- Returns the version string.

```

--------------------------------

### Screenshot with viewport and JPEG options

Source: https://gotenberg.dev/docs/convert-with-chromium/screenshot-html

Sends an HTML file with viewport and image format options. Sets width, height, format to jpeg, quality 85, and optimizeForSpeed true.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/screenshot/html \

--form files=@/path/to/index.html \

--form width=1280 \

--form height=720 \

--form format=jpeg \

--form quality=85 \

--form optimizeForSpeed=true \

-o my.jpeg
```

--------------------------------

### Docker Compose setup for Gotenberg and OTEL Collector

Source: https://gotenberg.dev/docs/telemetry

Defines two services: gotenberg (image gotenberg/gotenberg:8) and otel-collector (image otel/opentelemetry-collector-contrib). Gotenberg is configured with environment variables to export traces, metrics, and logs via OTLP using the gRPC protocol to the collector at http://otel-collector:4317. The collector exposes port 4317 and mounts the otel-collector-config.yaml file.

```yaml
services:  

  gotenberg:  

    image: gotenberg/gotenberg:8  

    ports:  

      - "3000:3000"  

    environment:  

      OTEL_SERVICE_NAME: "gotenberg"  

      OTEL_TRACES_EXPORTER: "otlp"  

      OTEL_METRICS_EXPORTER: "otlp"  

      OTEL_LOGS_EXPORTER: "otlp"  

      OTEL_EXPORTER_OTLP_PROTOCOL: "grpc"  

      OTEL_EXPORTER_OTLP_ENDPOINT: "http://otel-collector:4317"  

  

  otel-collector:  

    image: otel/opentelemetry-collector-contrib  

    ports:  

      - "4317:4317"  

    volumes:  

      - ./otel-collector-config.yaml:/etc/otelcol-contrib/config.yaml  

```

```yaml
receivers:  

  otlp:  

    protocols:  

      grpc:  

        endpoint: 0.0.0.0:4317  

  

exporters:  

  # Replace with your preferred backend (Jaeger, Grafana Cloud, Datadog, etc.).  

  debug:  

    verbosity: detailed  

  

service:  

  pipelines:  

    traces:  

      receivers: [otlp]  

      exporters: [debug]  

    metrics:  

      receivers: [otlp]  

      exporters: [debug]  

    logs:  

      receivers: [otlp]  

      exporters: [debug]  

```

--------------------------------

### Convert URL to PDF with printBackground enabled

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-url-to-pdf

Sends a POST request to include background graphics and colors in the PDF. Use this when the HTML has background images or colors that should appear in the output.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/url \

--form url=https://my.url \

--form printBackground=true \

-o my.pdf
```

--------------------------------

### Wait For Selector: cURL request with waitForSelector

Source: https://gotenberg.dev/docs/convert-with-chromium/screenshot-markdown

Example request using the waitForSelector form field with the selector '#app-ready'.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/screenshot/markdown \

--form files=@/path/to/index.html \

--form files=@/path/to/file.md \

--form 'waitForSelector=#app-ready' \

-o my.jpeg
```

--------------------------------

### GET /prometheus/metrics

Source: https://gotenberg.dev/docs/system/prometheus-metrics

Exposes internal metrics in Prometheus format. This endpoint is deprecated as of Gotenberg 8.29.0; use OpenTelemetry for observability.

```APIDOC
## GET /prometheus/metrics

### Description
Exposes internal metrics in Prometheus format. This endpoint is deprecated as of Gotenberg 8.29.0; use OpenTelemetry for observability.

### Method
GET

### Endpoint
/prometheus/metrics

### Parameters
#### Headers
- **Gotenberg-Trace** (string) - Optional - A custom request ID to identify the request in the logs; overrides the default UUID.

### Request Example
```
curl --request GET http://localhost:3000/prometheus/metrics
```

### Response
#### Success Response (200)
Returns the metrics in Prometheus format.

#### Response Example
No example provided.

```

--------------------------------

### Convert HTML to PDF with page layout options

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-html-to-pdf

Sends a POST request to the Chromium HTML conversion endpoint with page layout parameters: paperWidth, paperHeight, margins, landscape, and scale. The response is saved to my.pdf.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/convert/html \

--form files=@/path/to/index.html \

--form paperWidth=8.27 \

--form paperHeight=11.7 \

--form marginTop=1 \

--form marginBottom=1 \

--form marginLeft=1 \

--form marginRight=1 \

--form landscape=true \

--form scale=2.0 \

-o my.pdf
```

--------------------------------

### Convert to PDF/A and PDF/UA with pdfa and pdfua

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-markdown-to-pdf

Converts to PDF/A-1b and enables PDF/UA during post-processing using LibreOffice. Slower than native conversion. PDF/A and encryption are mutually exclusive (returns 400 Bad Request); PDF/A-1b and PDF/A-2b don't support attachments; LibreOffice overwrites CreateDate, ModDate, and Keywords when PDF/A runs with other post-processing.

```bash
curl \
  --request POST http://localhost:3000/forms/chromium/convert/markdown \
  --form files=@/path/to/index.html \
  --form files=@/path/to/file.md \
  --form pdfa=PDF/A-1b \
  --form pdfua=true \
  -o my.pdf
```

--------------------------------

### 409 Response for Console Exceptions

Source: https://gotenberg.dev/docs/convert-with-chromium/convert-markdown-to-pdf

Example 409 response body when failOnConsoleExceptions is true. Lists each console exception with its location in the source file.

```text
Content-Type: text/plain; charset=UTF-8

Gotenberg-Trace: {trace}

Body:



Chromium console exceptions:



exception "Uncaught" (17:10): Error: Exception 1

at file:///tmp/db09d2c8-31e3-4058-9923-c2705350f2b3/index.html:18:11;

exception "Uncaught" (20:10): Error: Exception 2

at file:///tmp/db09d2c8-31e3-4058-9923-c2705350f2b3/index.html:21:11:
```

--------------------------------

### cURL request to convert HTML/Markdown to screenshot with emulated media features

Source: https://gotenberg.dev/docs/convert-with-chromium/screenshot-markdown

Sends a POST request to the Chromium screenshot markdown endpoint with two files (index.html and file.md) and an emulatedMediaFeatures JSON array that forces dark color scheme and reduced motion. The output is saved to my.jpeg.

```bash
curl \

--request POST http://localhost:3000/forms/chromium/screenshot/markdown \

--form files=@/path/to/index.html \

--form files=@/path/to/file.md \

--form emulatedMediaFeatures='[{"name": "prefers-color-scheme", "value": "dark"}, {"name": "prefers-reduced-motion", "value": "reduce"}]' \

-o my.jpeg
```

--------------------------------

### 200 OK response headers and body

Source: https://gotenberg.dev/docs/manipulate-pdfs/factur-x

Successful response returns the Factur-X PDF file, or a ZIP archive if multiple input files were provided.

```http
Content-Disposition: attachment; filename={output-filename.ext}

Content-Type: {content-type}

Content-Length: {content-length}

Gotenberg-Trace: {trace}

Body: {output-file}
```

--------------------------------

### Set environment variables for private IP denial

Source: https://gotenberg.dev/docs/outbound-url-filtering

Example environment configuration to enable private IP denial for webhooks and API downloads. Set these variables to true to reject requests to private IPs.

```yaml
environment:  

  WEBHOOK_DENY_PRIVATE_IPS: "true"  

  API_DOWNLOAD_FROM_DENY_PRIVATE_IPS: "true"  

```

--------------------------------

### GET /health

Source: https://gotenberg.dev/docs/system/get-health-check

Performs a health check on the API and its modules. Returns a 200 status with a JSON body when healthy, or a 503 status when unhealthy.

```APIDOC
## GET /health

### Description
Reports whether the API and its modules (Chromium, LibreOffice) are healthy. Use it for Kubernetes liveness probes or monitoring agents.

### Method
GET

### Endpoint
/health

### Headers
- **Gotenberg-Trace** (string) - Optional - A custom request ID to identify the request in the logs; overrides the default UUID.

### Request Example
```
curl --request GET http://localhost:3000/health
```

### Response
#### Success Response (200)
The service is healthy.

#### Response Example
```
{
  status: "up",
  details: {
    chromium: {
      status: "up",
      timestamp: "2021-07-01T08:05:14.603364Z",
    },
    libreoffice: {
      status: "up",
      timestamp: "2021-07-01T08:05:14.603364Z",
    },
  },
}
```

#### Error Response (503)
The service is unhealthy.

#### Response Example
```
{
  status: "down",
  details: {
    chromium: {
      status: "up",
      timestamp: "2021-07-01T08:05:14.603364Z",
    },
    libreoffice: {
      status: "down",
      timestamp: "2021-07-01T08:05:14.603364Z",
      error: "LibreOffice is unhealthy",
    },
  },
}
```
```

--------------------------------

### cURL request with waitForSelector

Source: https://gotenberg.dev/docs/convert-with-chromium/screenshot-url

POST request to /forms/chromium/screenshot/url with waitForSelector set to '#app-ready'. The output is saved as my.jpeg.

```bash
curl \  

--request POST http://localhost:3000/forms/chromium/screenshot/url \  

--form url=https://my.url \  

--form 'waitForSelector=#app-ready' \  

-o my.jpeg  

```
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