The Tool Desk
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docker run --rm
-v "$PWD:/data"
<image>:<pinned-tag>
https://example.com /data/output.pdfThis works only when the image entrypoint invokes wkhtmltopdf and accepts its normal arguments. Check the image documentation or run its version command first. For production, pin a maintained tag or digest, verify the Qt build, install the fonts your pages need, and test representative documents before changing versions.
What runs inside the container
wkhtmltopdf is a headless command-line renderer that converts HTML pages to PDF with Qt WebKit; it does not require an X display or display service. The upstream project repository is archived and read-only as of January 2, 2023, and its separate packaging repository is archived as of August 28, 2023. Treat the binary and any Docker image as legacy dependencies: record the exact versions, review maintenance history, and regression-test output.
A container has its own filesystem. Files written there disappear when the container is removed unless you write into a bind mount or capture the process output on the host. Images are not interchangeable: entrypoints, wkhtmltopdf versions, patched-Qt features, libraries, fonts, architectures and command conventions differ.
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Choose and verify an image
Check the rendering build
The packaging documentation explains that patched Qt is used to provide additional wkhtmltopdf functionality. Run the image’s version command and confirm the reported Qt/build details match the features your application needs. Do not assume a distribution package and a patched-Qt build render the same page.
Pin version and architecture
Use a concrete tag or digest rather than an unpinned latest tag. Confirm that the image supports your deployment architecture; an image that works on one host may require emulation or a different build elsewhere. The packaging project documents Docker builds and architecture-specific packaging.
Inspect what the image contains
Determine whether the image is a one-shot command image or a base image, what its entrypoint is, and whether it includes only wkhtmltopdf or also wkhtmltoimage and supporting libraries. Surnet’s published variants distinguish a smaller edition from a full edition that includes wkhtmltoimage and libraries; its tags encode base-image, wkhtmltopdf and edition information. Check the maintainer’s current tag list because availability can change.
Account for fonts
Fonts are part of rendering, not a cosmetic afterthought. Missing fonts alter glyph widths, line breaks and pagination. Include the required font packages in the image and generate a test PDF inside the target container. Surnet’s example Dockerfile explicitly installs fonts for this reason.
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-
Create a working directory and place the output there:
mkdir -p wkhtml-job cd wkhtml-job -
Run the image with the current directory mounted at
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docker run --rm -v "$PWD:/data" <image>:<pinned-tag> https://example.com /data/output.pdf -
Confirm the result on the host:
ls -lh output.pdf file output.pdf
The destination must be the container path (/data/output.pdf), not merely the host path. The bind mount maps that container path back to your working directory. If the image has a different entrypoint, invoke the binary explicitly:
docker run --rm
-v "$PWD:/data"
<image>:<pinned-tag>
wkhtmltopdf https://example.com /data/output.pdfUse the form that the image documents; adding wkhtmltopdf to an image whose entrypoint already supplies it can produce an invalid command.
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Capture PDF bytes through standard output
Some images accept a hyphen as the output filename and write the PDF to standard output. Redirect that stream on the host:
docker run --rm
<image>:<pinned-tag>
https://example.com - > output.pdfKeep diagnostic messages on standard error so they do not corrupt the PDF stream. This method avoids a bind mount, but it depends entirely on the image’s documented argument convention. Verify the downloaded file with file output.pdf and open it with a PDF parser before using it in an automated pipeline.
Use a local HTML file
Mount the project directory and refer to the HTML by its container path:
docker run --rm
-v "$PWD:/data"
<image>:<pinned-tag>
/data/index.html /data/index.pdfRelative CSS, images and fonts must be readable from inside the container. If the document references host-only paths, localhost services or private DNS names, those addresses may not exist from the container’s network namespace. Make assets available through mounted files or a reachable URL, and test with the same network settings used in deployment.
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Build an image you control
A project-owned image should install a compatible wkhtmltopdf build and all required runtime libraries, put the executable on PATH, and set an entrypoint such as wkhtmltopdf. The packaging project documents Docker as a build method and builds from the wkhtmltopdf source tree with Qt. There is no universal safe apt-get install wkhtmltopdf recipe: distribution packages and patched-Qt builds can differ in capabilities and output.
A minimal structure is:
FROM <approved-base-image>
# Install the pinned wkhtmltopdf package or copied binary,
# required shared libraries, and application fonts.
COPY fonts/ /usr/local/share/fonts/
RUN fc-cache -f
ENTRYPOINT ["wkhtmltopdf"]Replace the placeholders with packages appropriate to your base OS and target architecture. Record the package checksum or image digest in your build process. Build a smoke-test PDF during CI so a missing library or font fails before deployment.
Image-selection checklist
| Decision | What to verify | Why it matters |
|---|---|---|
| wkhtmltopdf/Qt variant | Version output and whether patched Qt is present | Features and rendering can differ between builds. |
| Tag and architecture | Pinned tag or digest and supported CPU architecture | Floating tags and incompatible binaries undermine reproducibility. |
| Entrypoint | Whether arguments begin with a URL, HTML path or an explicit binary | The same docker run command is not portable across images. |
| Runtime contents | Shared libraries, fonts, wkhtmltoimage, and whether it is a base or one-shot image |
Missing dependencies cause startup errors or layout changes. |
| Maintenance | Registry update history, source repository and base-image status | Old images may contain unpatched operating-system components. |
The openlabs Docker Hub page still documents bind-mounted output, but its page reports an update almost 11 years before it was accessed. That is a maintenance warning, not a recommendation.
Reliable production operation
Make inputs deterministic
- Pin the image tag or digest and record the wkhtmltopdf and Qt versions.
- Bundle or install the exact fonts used by your templates.
- Use stable asset URLs or mount the complete HTML asset tree.
- Run the same architecture and network policy in CI and production.
Validate output
Check the process exit status, file existence and non-zero size. Parse the PDF or render a page image in CI to detect blank output, changed pagination or missing glyphs. Keep representative pages that exercise images, web fonts, JavaScript and long tables.
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Control resource use
Apply container CPU, memory and timeout limits appropriate to your workload. Large pages, many images and complex scripts consume more memory than a simple document. A failed or timed-out process should leave no partial file in the location consumed by downstream jobs; write to a temporary name and rename only after validation.
Troubleshooting
No PDF appears on the host
Confirm that the output path is inside the mounted directory and that the mount is writable. Inspect the container command and entrypoint; the image may have written to a different path or emitted bytes to standard output. Run docker inspect on the image to review its configured entrypoint and command.
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“No such file or directory” or shared-library errors
The binary or one of its runtime libraries is absent for the image architecture. Run the documented version command, inspect the image contents, and choose a complete variant or rebuild with the required libraries. Do not copy a binary built for a different base image without checking its dependencies.
Blank PDF or failed navigation
Test the URL from inside the container. Verify DNS, proxy settings, certificates, authentication and firewall rules. For local files, check that every CSS, image and font path is accessible under the mounted container path. A bot check or login page can also produce an apparently blank result.
Layout, pagination or glyphs changed
Compare the wkhtmltopdf and Qt build, installed fonts, locale, architecture and input assets with the known-good environment. Pin the previous image and run the same regression corpus before accepting an upgrade.
Standard-output capture is corrupted
Ensure the image really supports - as its output argument and that only PDF bytes go to standard output. Redirect standard error separately when diagnosing:
docker run --rm <image>:<pinned-tag>
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Frequently asked questions
Does wkhtmltopdf need Chrome or an X server in Docker?
No. It is a headless Qt WebKit command-line tool, so a display service is not required.
Should I use a floating Docker tag?
No. Pin a concrete tag or digest and keep a regression PDF set for upgrades.
Can a container read a file on my laptop without a volume?
No. Mount the directory containing the file, then use its container path in the wkhtmltopdf command.
When is stdout preferable to a bind mount?
Use stdout when the selected image documents PDF streaming and your pipeline can safely redirect and validate the bytes; otherwise a bind mount is clearer and easier to inspect.
Frequently Asked Questions
Which path should I use for the output PDF?
Use a path inside the bind-mounted directory, such as /data/output.pdf; the corresponding host file appears in the mounted host directory.
Why do two wkhtmltopdf images produce different pagination?
Their Qt builds, fonts, libraries, versions, locales or architectures may differ. Compare those components and pin the image that passes your regression tests.
How can I keep a failed conversion from replacing a valid PDF?
Write to a temporary filename, check the exit status and PDF contents, then rename it atomically after validation.
Quick Recap
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