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Put the logo in the first page’s HTML, not in --footer-html. Give a first-page wrapper a fixed physical height, make it the positioning context, reserve space for the image, and absolutely position the logo inside that reserved area. Use matching paper size and margins in CSS and on the command line. This keeps the logo on page one only and works for both A4 and US Letter when the wrapper dimensions are changed with the paper size.
The reliable first-page pattern
The following pattern creates a one-page cover area. The wrapper establishes a containing block with a known height; the image is anchored to its bottom edge without affecting later document flow.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
@page { size: A4; margin: 12mm 12mm 16mm; }
html, body { margin: 0; padding: 0; }
.first-page {
position: relative;
box-sizing: border-box;
height: 297mm;
padding: 12mm 12mm 35mm;
}
.logo {
position: absolute;
left: 12mm;
right: 12mm;
bottom: 16mm;
width: auto;
max-width: calc(100% - 24mm);
max-height: 25mm;
object-fit: contain;
}
</style>
</head>
<body>
<section class="first-page">
<!-- first-page content -->
<img class="logo" src="logo.png" alt="Logo">
</section>
</body>
</html>position: relative makes .first-page the containing block. The logo’s bottom value is therefore measured from that wrapper, rather than from an unpredictable page or the end of the text. The bottom padding keeps normal content clear of the image.
Set A4 or Letter geometry consistently
wkhtmltopdf 0.12.6 with patched Qt accepts paper-size and margin options such as --page-size, --page-height, --page-width, -T, -R, -B and -L. The CSS page box, wrapper height and command-line settings must describe the same sheet.
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A4
wkhtmltopdf
--page-size A4
--margin-top 12mm
--margin-right 12mm
--margin-bottom 16mm
--margin-left 12mm
input.html output.pdfA4 is 210mm × 297mm, so the wrapper uses height: 297mm. The example’s 12mm top, left and right margins and 16mm bottom margin are repeated in the command.
US Letter
wkhtmltopdf
--page-size Letter
--margin-top 12mm
--margin-right 12mm
--margin-bottom 16mm
--margin-left 12mm
input.html output.pdfFor Letter, change the CSS to @page { size: Letter; } and change the wrapper height to 279.4mm. Keep the same margins in both places. You can also use explicit --page-height 279.4mm and a matching width, but do not mix an explicit command-line geometry with an unrelated CSS wrapper height.
Make a variable-height logo safe
Uploaded logos can be short and wide or tall and narrow. Constrain at least one dimension while preserving the source aspect ratio.
- Use
max-heightwhen the vertical footprint is the critical limit. - Use
max-widthwhen the logo must stay within the text column. - Use
height: autofor a normal image, orobject-fit: containwhen both dimensions are constrained. - Reserve bottom padding equal to the largest expected rendered logo height plus your desired clearance.
For a logo that should span the content width, replace the sizing rules with width: 100%; height: auto; inside a positioned bottom block. Increase the wrapper’s bottom padding to accommodate the tallest permitted upload. Otherwise, a tall image can overlap text even though its bottom edge is correctly anchored.
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Using a dedicated bottom block
.first-page {
position: relative;
box-sizing: border-box;
height: 297mm;
padding: 12mm 12mm 42mm;
}
.logo-slot {
position: absolute;
left: 12mm;
right: 12mm;
bottom: 16mm;
height: 25mm;
}
.logo-slot img {
display: block;
width: 100%;
height: 100%;
object-fit: contain;
}This version gives every upload the same 25mm slot. object-fit: contain preserves the aspect ratio and centers the image within the slot without distortion.
Keep the logo on the first page of a longer document
Absolute positioning is tied to the wrapper’s containing block; it is not a general “bottom of every flowed PDF page” mechanism. Treat the cover as a separate fixed-height object, then start the remaining content after it.
<section class="first-page">
...cover content and logo...
</section>
<div class="after-cover">
...remaining document...
</div>.after-cover {
page-break-before: always;
}A deliberate page break prevents the next content block from being packed into unused space on the cover. Test both a short document and a multi-page document; a wrapper that looks correct in a one-page PDF can behave differently when following content flows across page boundaries.
Why the usual alternatives fail
--footer-html and footer options
wkhtmltopdf’s header and footer options are document-furniture features. A footer is designed to repeat on pages, so it does not express “only on the first page.” Putting this logo in the page HTML gives you a page-specific wrapper instead.
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position: fixed; bottom: 0
Do not rely on fixed positioning for this job. An issue report for wkhtmltopdf 0.12.4 describes a fixed bottom element appearing only on the last page and at the end of the text rather than at the physical page bottom. A fixed element may work in a browser preview and still fail in the PDF renderer.
Flexbox alignment
wkhtmltopdf uses an older rendering engine. A wkhtmltoimage issue reports no visible difference when display: flex, justify-content and align-items were added in the affected setup. Flexbox is therefore a poor foundation for a production PDF placement that must be exact. Use a positioned wrapper and physical units instead.
A hard-coded pixel offset
A value such as top: 700px can appear to work for one paper size, margin set and rendering scale. It is brittle when switching between A4 and Letter or changing margins. A bottom coordinate in millimetres follows the page geometry rather than one particular pixel output.
Image loading and content details that affect placement
- Use a local file path or a reachable URL that the wkhtmltopdf process can access. If the image is remote, verify that the conversion host can resolve and download it.
- Give the image an explicit or bounded size. An image whose intrinsic dimensions are discovered late can change the required reserved space.
- Keep the
altattribute even though it is not printed; it makes the source safer and more accessible when reused outside PDF conversion. - Do not place substantial flowing text after the absolutely positioned logo inside the cover and assume it will avoid the image. Absolute elements are removed from normal flow; the padding reservation is what prevents overlap.
Verification checklist
- Run the exact wkhtmltopdf build used in production; the documented current line is 0.12.6 with patched Qt, while reported fixed-position behavior involves older builds.
- Render A4 and Letter using the same margins in
@page, the wrapper and the command line. - Try a short, wide logo; a wide logo with transparent borders; and a tall logo. Confirm that no text enters the reserved block.
- Render a one-page input and a multi-page input separately. Add a deliberate page break after the first-page wrapper when the document continues.
- Inspect the generated PDF itself. Browser previews do not reproduce every wkhtmltopdf behavior, especially for fixed positioning and flexbox.
Troubleshooting
The logo is missing
Check the image path, file permissions and whether the conversion process can access the URL. Temporarily use a known local PNG, then restore the dynamic source. Also check that the image is not being hidden by a selector or a zero-sized parent.
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The logo is too high or too low
Confirm that the wrapper height matches the selected paper size and that command-line margins match the CSS margins. Adjust the wrapper’s bottom value for clearance; do not compensate with an arbitrary pixel top value.
Text runs underneath the image
Increase the wrapper’s bottom padding or reduce the image’s maximum height. The reserved block must cover the largest rendered upload, not merely the logo used in your first test.
The logo appears on a later page
Inspect the wrapper’s height and page break. If the cover content itself exceeds one sheet, the wrapper cannot remain a single first-page object; shorten the cover or move material into the post-cover section.
Letter output clips the bottom
Use 279.4mm for the Letter wrapper and ensure the bottom margin is included consistently. A 297mm A4 wrapper on Letter paper places the bottom anchor beyond the sheet.
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The result differs between development and production
Compare wkhtmltopdf versions, patched-Qt builds, command-line margins, image files and fonts. Render with the production binary in an automated check and inspect the PDF rather than relying on a browser screenshot.
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If your actual goal is a clean screenshot or PDF of a page rather than a locally authored wkhtmltopdf document, ScreenshotNeo provides a single API request. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups and chat widgets; each step can be disabled. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and the response identifies the page verdict and billing status in X-Page-Verdict and X-Billed headers.
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import requests
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open("shot.webp", "wb").write(r.content)Node.js:
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Use the fixed-height wrapper when you control the HTML and need a first-page-only logo in a PDF generated by wkhtmltopdf. It is explicit, paper-size-aware and independent of repeating footer machinery. If you need a logo repeated on every page, use a separately tested header/footer design instead; that is a different requirement from a first-page cover logo.
Frequently Asked Questions
Can I use the same CSS for A4 and Letter?
Use the same positioning rules and margins, but change the page size and wrapper height: 297mm for A4 and 279.4mm for US Letter.
Will this place a logo at the bottom of every PDF page?
No. It anchors the logo to the first-page wrapper. Repeating page furniture requires a separate header/footer approach and its own renderer-specific testing.
Why does a browser preview look right but wkhtmltopdf does not?
wkhtmltopdf’s older engine does not implement all modern CSS behavior consistently, particularly fixed positioning and some flexbox layouts. Always inspect the generated PDF.
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