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If AWS Lambda reports wkhtmltopdf: command not found, the deployed function cannot find the executable. Installing wkhtmltopdf on your computer does not put it in Lambda. Package a Linux-compatible executable with the function, add it in a Lambda layer, or include it in a container image—and call it by its correct path or make its directory available on PATH.
What the error means—and what to check first
This message is a command-resolution failure: the process running in Lambda cannot resolve the name wkhtmltopdf to an executable. Start with the artifact Lambda actually runs, not the machine where you wrote or built the function.
- Inspect the deployment. Confirm the ZIP, attached layer, or container image contains the executable. A file present only on your workstation or in a temporary build stage is not available to the deployed function.
- Check the path. If the file is in a layer at
bin/wkhtmltopdf, Lambda extracts that layer under/opt, so try/opt/bin/wkhtmltopdf. AWS documents layerbinas a PATH directory for all runtimes; an explicit path makes it clear which file your code is invoking. - Check native compatibility. A Linux executable must match the function’s configured architecture, x86-64 or arm64, and be compatible with its runtime environment. A macOS or Windows executable will not become usable just because it is inside a ZIP.
- Recheck the error after deployment. If the message changes to a missing shared-library error, command lookup is no longer the only issue. The executable may need libraries or other runtime files that are not in the package.
AWS’s layer packaging guidance says: “Because Lambda functions run on Amazon Linux, your layer content must be able to compile and build in a Linux environment.” AWS recommends building layer content in Linux and identifies Docker as one way to do that.
Choose a packaging method
Both ZIP deployments with a layer and Lambda container images can package a native executable. The right choice depends on your current deployment workflow and how much control you need over the operating system and native dependencies. Neither is universally better.
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| Option | What goes in the deployment | Best fit | What to verify |
|---|---|---|---|
| Function ZIP | Your handler and the executable, plus any required supporting files, in the function package. | A small deployment where keeping the executable with the handler suits your existing process. | The deployed ZIP contains the files at the paths your code uses, and the executable matches the Lambda runtime and architecture. |
| ZIP plus Lambda layer | The function ZIP contains application code; a layer ZIP contains supplementary executable and dependency files. | When you want to package native files separately from application code. | The layer archive has the expected top-level directories, and its contents are available below /opt. |
| Container image | The image includes the application and the executable dependencies. | When your deployment workflow already builds and publishes Lambda container images, or you need to manage the OS and native files together. | The image’s base environment, executable, libraries, and architecture all match the function configuration. For AL2023-based Lambda images, AWS identifies microdnf (also linked as dnf) in place of AL2’s yum. |
Package wkhtmltopdf in a ZIP-based Lambda deployment
Build a layer with the expected paths
For a layer, place the executable under a top-level bin directory in the layer archive. Any layer libraries belong under a top-level lib directory. AWS documents lib as an LD_LIBRARY_PATH directory for all runtimes. The following commands package files you have already obtained or built for a compatible Linux environment; they do not install wkhtmltopdf or prove that a particular binary is compatible.
mkdir -p layer/bin layer/lib
cp /path/to/linux/wkhtmltopdf layer/bin/wkhtmltopdf
chmod 755 layer/bin/wkhtmltopdf
# If needed, copy compatible shared libraries into layer/lib/.
cd layer
zip -r ../wkhtmltopdf-layer.zip .
cd ..Inspect the archive before attaching it. Its entries should start with bin/ and, if you bundled libraries, lib/—not an extra enclosing directory such as layer/bin/. Then attach the layer to the function using your usual Lambda deployment workflow.
unzip -l wkhtmltopdf-layer.zipWith the expected layer layout, invoke the binary directly as /opt/bin/wkhtmltopdf. This avoids depending on PATH lookup. If you put the executable in the function ZIP instead, use its actual deployed path and make sure that location is executable.
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Call it from Python using an explicit path
This handler illustrates invoking a local input file and writing a PDF to the Lambda temporary directory. Adapt the paths and error handling to your application. It assumes the executable and any required libraries have already been packaged correctly.
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import subprocess
WKHTMLTOPDF = "/opt/bin/wkhtmltopdf"
def handler(event, context):
html_path = "/tmp/input.html"
pdf_path = "/tmp/output.pdf"
if not os.path.isfile(WKHTMLTOPDF):
raise FileNotFoundError(
f"wkhtmltopdf is missing at {WKHTMLTOPDF}; check the deployed ZIP or layer"
)
if not os.access(WKHTMLTOPDF, os.X_OK):
raise PermissionError(f"wkhtmltopdf is not executable: {WKHTMLTOPDF}")
if not os.path.isfile(html_path):
raise FileNotFoundError(f"HTML input is missing: {html_path}")
result = subprocess.run(
[WKHTMLTOPDF, html_path, pdf_path],
check=True,
capture_output=True,
text=True,
timeout=60,
)
return {
"pdf_path": pdf_path,
"stdout": result.stdout,
"stderr": result.stderr,
}The example uses an explicit argument list rather than a shell command string, so spaces in paths are handled as arguments and the process does not depend on a shell to resolve the executable. The input file must exist in the running function; packaging the binary does not create your HTML input. Choose a timeout suitable for your workload and the function’s configured limits.
Resolve shared-library and architecture problems
If Lambda now finds the executable but reports a loader or shared-library error, inspect the native dependencies rather than changing PATH repeatedly. The executable may depend on libraries, fonts, or font configuration that were not included. Bundle only files that are compatible with the Lambda environment and your selected architecture; for a layer, place libraries in its lib directory. If the binary expects libraries in another location, configure the runtime accordingly and verify the final environment.
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A third-party AL2023 example, malwazan/wkhtmltopdf-amazon-linux-2023, describes a layer containing a wrapper, executable, libraries, fonts, and font configuration, with callers using /opt/bin/wkhtmltopdf. Treat it as an example to audit, not an AWS-supported recipe: its listing does not establish security, maintenance, or compatibility with your particular runtime and architecture. Inspect the build inputs and validate it in your own function before relying on it.
Use a Lambda container image instead
A container image can package the application, wkhtmltopdf, and its native dependencies together. Build from a Lambda-compatible image for the runtime and architecture configured for the function, and ensure the final image—not merely an intermediate build stage—contains the executable at the path your handler invokes.
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Troubleshoot by the exact failure
wkhtmltopdf: command not found
- Cause: The executable is absent from the deployed artifact, stored at a different path, or not discoverable through PATH.
- Fix: Inspect the actual ZIP, attached layer, or final image. For the documented layer layout, test the explicit path
/opt/bin/wkhtmltopdfand verify that the archive hasbin/at its top level.
No such file or directory even though the file appears present
- Cause: The path used by the process does not match the deployed path. Native binary or loader incompatibility can also surface as a file-not-found-style launch failure.
- Fix: Confirm the exact path and architecture, and check whether the executable was built for a compatible Linux environment. Do not assume that a file listing alone proves it can run.
Permission denied
- Cause: The file lacks execute permission or is being invoked from a location or packaging setup that does not permit execution.
- Fix: Set executable permissions when packaging (for example,
chmod 755), then inspect the deployed artifact and verify the path being invoked.
A shared-library or loader error replaces the command error
- Cause: Lambda can start the executable but cannot find one of its native dependencies.
- Fix: Identify the missing library, include a compatible copy with the deployment, and use the correct library search path. For a layer, AWS documents
libunder/optas a library search location; a wrapper may be needed for dependencies outside that path.
It works locally but not after deployment
- Cause: Your local operating system, installed libraries, architecture, or PATH differs from Lambda’s runtime environment.
- Fix: Build or validate the packaged native files in a Linux environment compatible with the Lambda runtime, check the configured x86-64 or arm64 architecture, and test the artifact that is actually deployed.
Or skip the browser setup
If your input is a publicly accessible webpage and you need a clean screenshot or PDF rather than a Lambda-hosted wkhtmltopdf conversion of local or generated HTML, ScreenshotNeo can take the URL directly. It is a different workflow, not a drop-in executable for rendering arbitrary local files.
One GET request returns a screenshot or PDF. This cURL example saves a WebP screenshot:
Quick Recap
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options. Cookie banners, popups, and chat widgets are removed before the shot; bot checks, blank pages, and failed loads are never billed; an MCP server lets AI agents take screenshots; and 1,000 screenshots a month are free with no card, with paid plans starting at $5 for 3,000. Sign up for 1,000 free screenshots a month with no card.
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