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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Use a package that matches the Colab runtime, install it with apt, then run wkhtmltopdf input.html output.pdf. Start by checking the runtime’s Ubuntu release and CPU architecture. The commonly documented Focal amd64 package works only when those values match; Colab images can change, so treat the download URL as an example rather than a permanent guarantee.
What wkhtmltopdf does in Colab
wkhtmltopdf is an open-source command-line renderer that converts HTML or a web URL into PDF with the Qt WebKit engine. Its documentation says it runs headlessly and does not normally need a desktop display or display service. The basic form is:
wkhtmltopdf input.html output.pdfGoogle Colab gives you a temporary Linux runtime, not a preconfigured desktop. You therefore install the executable inside the current runtime, create or upload HTML, convert it, and download the resulting PDF. Packages and files disappear when the runtime is reset or disconnected.
1. Inspect the Colab runtime before downloading anything
Open a new code cell and run:
!cat /etc/os-release
!uname -mRecord the distribution release and architecture. The example package below is for Ubuntu/Debian-style systems using the Focal (Ubuntu 20.04) amd64 build. An x86_64 result corresponds to amd64. Do not install that file on an incompatible architecture or a runtime whose libraries do not match.
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The project’s downloads page identifies the 0.12.6 series as stable, released June 11, 2020, with release assets hosted on GitHub. Because that release is old relative to changing Colab images, re-check the live release assets and runtime metadata if installation fails.
2. Install wkhtmltopdf correctly
For a compatible Focal amd64 runtime, this sequence downloads the Debian package, refreshes package metadata, installs the package and verifies the command:
!wget -O wkhtmltox.deb https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.focal_amd64.deb
!sudo apt-get update
!sudo apt-get install -y ./wkhtmltox.deb
!wkhtmltopdf --versionUse apt-get install ./wkhtmltox.deb, not a manual copy of the .deb into /usr/bin. Apt reads package metadata and resolves dependencies. Copying the archive as if it were an executable is a known cause of permission and “Exec format error” failures.
A successful verification prints a version string. If the install reports unresolved dependencies, stop and inspect /etc/os-release, the architecture, and the current project release assets instead of repeatedly retrying the same URL.
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3. Create an HTML document in the notebook
This Python cell writes a UTF-8 HTML file into the runtime’s working directory:
from pathlib import Path
html = """
Colab PDF test
Hello from Colab
This page was converted by wkhtmltopdf.
"""
Path("input.html").write_text(html, encoding="utf-8")Convert it and download the result:
!wkhtmltopdf input.html output.pdf
from google.colab import files
files.download("output.pdf")For a public page, pass its URL instead of a local filename:
!wkhtmltopdf https://example.com output.pdfThe URL must be reachable from the Colab runtime. A site that requires a login, blocks automated traffic, or renders its content only after unsupported browser interaction may produce an incomplete document.
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4. Useful rendering options
Put global options before the input and output arguments. The command reference documents options for page dimensions, JavaScript, print styles, local files, headers and footers.
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Control paper and orientation
!wkhtmltopdf --page-size A4 --orientation Landscape input.html landscape.pdfChoose the paper size and orientation that match the document rather than relying on defaults. Margins, header text, footer text and page numbering can also be set with the corresponding command-line options documented by the project.
Wait for JavaScript
!wkhtmltopdf --javascript-delay 3000 https://example.com dynamic.pdfThe delay is in milliseconds. It gives scripts time to populate a page, but it does not make modern browser APIs universally compatible with Qt WebKit. Confirm the page is reachable and inspect the generated PDF before increasing the delay.
Use print styles
!wkhtmltopdf --print-media-type input.html print-media.pdfThis asks the renderer to apply print-oriented CSS. Keep print rules deliberate: navigation, animations and screen-only controls may otherwise appear in the PDF.
Allow local assets only when necessary
!wkhtmltopdf --enable-local-file-access input.html local-assets.pdfUse this only when the HTML references local CSS, images or fonts. Keep those files in a controlled directory. Enabling local access broadens what page content can read from the runtime filesystem.
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Pass request headers when a server needs them
The command reference includes header options for requests. Use them for a legitimate, temporary access requirement, and never place API keys or session cookies in a notebook that will be shared.
5. Local files, images and fonts
Relative paths are resolved from the HTML file’s location. A predictable layout helps:
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from pathlib import Path
Path("assets").mkdir(exist_ok=True)
# Write input.html and place images, CSS and fonts below assets/If an image is missing, check its path, file permissions and format. For local resources, use --enable-local-file-access only for the directory you control. Remote resources must be accessible to the runtime and may fail because of TLS, authentication, robots rules or network restrictions.
6. Direct invocation or a Python wrapper?
| Approach | Best fit | Trade-off |
|---|---|---|
| Shell command | Occasional conversions, notebooks and batch jobs | Smallest dependency chain; direct access to every CLI flag and clear process exit status |
| Python wrapper | Application code that benefits from a Python API | Convenient object-level calls, but wrapper documentation lists additional Linux components such as Xvfb and font packages |
A wrapper still needs the wkhtmltopdf executable. If your notebook only converts a few files, subprocess or a shell cell avoids adding another package layer. For a wrapper, follow that project’s installation instructions and verify its required system packages in the current Colab image.
7. Troubleshooting common Colab failures
“Exec format error”
Cause: the binary architecture does not match the runtime, or the Debian archive was treated as an executable. Fix: rerun !uname -m, select a matching release asset, and install the archive with sudo apt-get install -y ./wkhtmltox.deb.
Permission denied or command not found
Cause: installation did not complete or the executable is not on PATH. Fix: run !wkhtmltopdf --version, review the apt output, and reinstall the package rather than copying files manually.
Unmet dependencies
Cause: the package targets a different Ubuntu/Debian release, or the Colab image has moved on. Fix: inspect /etc/os-release, run !sudo apt-get update, and consult the current GitHub release assets. Do not assume the 2020 Focal package remains compatible forever.
Blank, partial or stale dynamic pages
Cause: JavaScript has not finished, the site needs browser features Qt WebKit does not provide, or the URL is blocked. Fix: test reachability, add a measured --javascript-delay, use print CSS where appropriate, and inspect the PDF. A delay cannot fix an unsupported application or an authentication wall.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsMissing CSS, images or fonts
Cause: incorrect relative paths, inaccessible remote resources or local-file restrictions. Fix: keep assets beside the HTML, check paths and permissions, and add --enable-local-file-access only for controlled local content.
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Cause: the wrapper has dependencies beyond the binary. Fix: install the system components named by that wrapper’s documentation, or use direct invocation when you do not need its API.
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Cause: release assets or runtime images changed. Fix: inspect the project’s current downloads and release pages, then choose an asset matching the live distribution and architecture. Pin the verified installation steps in a notebook cell so a future runtime change is visible rather than silently producing a different result.
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- Runtime lifetime: installed software and generated PDFs live in the temporary runtime. Download outputs or copy them to durable storage before disconnecting.
- Rendering time: large pages, remote assets and JavaScript delays increase conversion time. Prefer local, deterministic assets for repeatable reports.
- Batching: loop over files or URLs in Python, capture each process’s return code, and retain stderr so one failed page does not look like a successful PDF.
- Reproducibility: record the output of
/etc/os-release,uname -mandwkhtmltopdf --versionwith your job logs. - Display requirements: wkhtmltopdf is headless; a desktop session is not normally required. A Python wrapper can still introduce Xvfb requirements.
9. Security rules for notebook conversions
The official downloads page warns not to use wkhtmltopdf with untrusted HTML and JavaScript without sanitizing it, because malicious input can lead to complete server takeover. Treat HTML, URLs, scripts, local assets and headers as hostile inputs. Do not embed secrets in generated pages or shell commands.
Colab documentation explains that code running through a connected runtime can access that runtime’s filesystem and advises users to trust notebook authors. Run installation and conversion cells only in notebooks you understand. Remove credentials and sensitive files before sharing or disconnecting the runtime.
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10. Safe, repeatable notebook checklist
- Inspect
/etc/os-releaseanduname -m. - Select a release asset matching both values.
- Install the
.debwith apt and verifywkhtmltopdf --version. - Create or upload UTF-8 HTML and keep local assets in a controlled directory.
- Run
wkhtmltopdf input.html output.pdf, adding only the flags you need. - Open or download the PDF and check fonts, images, page breaks and dynamic content.
- Remove secrets and sensitive files before sharing the notebook or disconnecting the runtime.
Frequently asked questions
Does wkhtmltopdf need Xvfb in Colab?
The renderer itself is headless and normally does not require a display service. A particular Python wrapper may list Xvfb as an additional dependency.
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Can I convert a private URL?
Only if the Colab runtime can authenticate and reach it. Supply credentials through secure mechanisms, not hard-coded notebook cells, and expect some modern authentication flows to be incompatible with Qt WebKit.
Where does Colab save the PDF?
Unless you choose another path, it is saved in the current runtime filesystem. Use google.colab.files.download or copy it to storage before the runtime ends.
Is 0.12.6 guaranteed to work on every Colab image?
No. It is the documented stable series released June 11, 2020; compatibility depends on the live distribution, architecture and libraries.
Frequently Asked Questions
Does wkhtmltopdf need Xvfb in Colab?
The renderer itself is headless and normally does not require a display service. A particular Python wrapper may list Xvfb as an additional dependency.
Can I convert a private URL?
Only if the Colab runtime can authenticate and reach it. Supply credentials through secure mechanisms, not hard-coded notebook cells, and expect some modern authentication flows to be incompatible with Qt WebKit.
Where does Colab save the PDF?
Unless you choose another path, it is saved in the current runtime filesystem. Use google.colab.files.download or copy it to storage before the runtime ends.
Is 0.12.6 guaranteed to work on every Colab image?
No. It is the documented stable series released June 11, 2020; compatibility depends on the live distribution, architecture and libraries.
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