The Tool Desk
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CSS image-orientation: from-image can be a useful diagnostic, but server-side PDF output is more reproducible when the pixels are physically normalized first.
Why an iPhone photo turns sideways in a PDF
Many cameras save the sensor’s pixels in one raster order and record the intended viewing direction in the EXIF Orientation tag. A portrait can therefore contain landscape-shaped pixels plus metadata saying “rotate 90 degrees.” Photo viewers commonly honor that metadata. A PDF pipeline may decode the pixels without applying it, or an intermediate step may strip the metadata before Chromium rasterizes the image.
The result is not a Puppeteer rotation setting that is missing; it is an image whose orientation instruction was never applied at the stage that produced the PDF. EXIF also has mirrored states, not only 90°, 180°, and 270° rotations, so a fix that handles rotation alone is incomplete.
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The robust pipeline: normalize before HTML rendering
- Read the original image bytes.
- Run Sharp
autoOrient(), which applies the EXIF rotation or mirror transform. - Encode a canonical JPEG or PNG. Sharp removes the EXIF Orientation tag from the oriented output.
- Make that output reachable from the page as a data URL, file URL, or authenticated HTTP URL.
- Wait until the image has decoded, then call
page.pdf().
Sharp documents the operation as: “Auto-orient based on the EXIF Orientation tag, then remove the tag.” Its constructor option likewise rotates or flips an image to match EXIF Orientation when present. Only that EXIF tag is considered; XMP tiff:Orientation and other metadata are a separate responsibility.
Install the dependencies
npm install puppeteer sharpSharp includes native image-processing components for common Node.js platforms. In a production build, install it for the same operating system and architecture that runs your Puppeteer worker.
Complete Node.js example using a normalized buffer
import puppeteer from 'puppeteer';
import sharp from 'sharp';
import { readFile } from 'node:fs/promises';
const inputPath = './photo.jpg';
const outputPath = './oriented-report.pdf';
const input = await readFile(inputPath);
const normalized = await sharp(input)
.autoOrient() // applies rotations and mirror states
.jpeg({ quality: 90 }) // use .png() when lossless PNG output is required
.toBuffer();
const imageData = `data:image/jpeg;base64,${normalized.toString('base64')}`;
const browser = await puppeteer.launch({ headless: true });
try {
const page = await browser.newPage();
await page.setContent(`
<!doctype html>
<html>
<head>
<style>
@page { size: A4; margin: 18mm; }
body { font-family: sans-serif; margin: 0; }
img { display: block; max-width: 100%; height: auto; }
</style>
</head>
<body>
<h1>Photo report</h1>
<img src="${imageData}" alt="Normalized camera photo">
</body>
</html>`, { waitUntil: 'load' });
await page.evaluate(async () => {
const images = [...document.images];
await Promise.all(images.map(async image => {
if (!image.complete) {
await new Promise((resolve, reject) => {
image.addEventListener('load', resolve, { once: true });
image.addEventListener('error', reject, { once: true });
});
}
if (image.decode) await image.decode();
}));
});
await page.pdf({
path: outputPath,
format: 'A4',
printBackground: true,
waitForFonts: true
});
} finally {
await browser.close();
}The data URL avoids another network request and is convenient for a single image. For many or very large images, write normalized files to a controlled temporary directory or serve them from an endpoint instead of inflating the HTML string.
File-based variant
await sharp('photo.jpg')
.autoOrient()
.toFile('photo-normalized.jpg');
await page.setContent(`
<img src="file:///absolute/path/photo-normalized.jpg"
style="max-width:100%;height:auto">
`);
await page.pdf({ path: 'output.pdf', printBackground: true });Use an absolute file URL and ensure the Chromium process is allowed to read it. An HTTP endpoint is usually easier to secure and observe in containerized deployments.
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CSS image-orientation: useful fallback, not the deterministic fix
img {
image-orientation: from-image;
}With from-image, the browser is asked to use EXIF information to orient the image. The property is intended for camera and scanner orientation; use transform: rotate(...) for a deliberate design rotation. This can quickly show whether EXIF is the cause, but print behavior depends on the Chromium version and on which decoder receives the image. A later service that strips metadata will lose the correction.
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If you use the fallback, put the rule in print CSS or explicitly select the media type:
await page.emulateMediaType('screen'); // only if the document is authored for screen styles
await page.pdf({ path: 'output.pdf' });By default, page.pdf() generates a PDF using the print CSS media type. Do not apply both Sharp’s transform and a manual CSS rotation for the same camera orientation; that double-rotates the image.
Make Puppeteer wait for the real image
Correct pixels can still produce a missing or blank image if printing starts before a remote resource has loaded. For remote images, verify that the URL is reachable from the browser process, permits the required authentication, and is not blocked by an access-control policy.
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page.goto(url, {waitUntil: 'networkidle0'})when navigation is the page-loading step. - After
setContent(), wait for each image’sloadevent and calldecode()where available. - For lazy-loaded images, scroll or trigger the site’s lazy-load mechanism before collecting image elements.
- Only call
page.pdf()after fonts and images needed for layout are ready.
PDF settings that affect the result
Puppeteer’s PDF options control page geometry and readiness, not an unhandled EXIF transform.
| Option | What it changes | What it cannot fix |
|---|---|---|
format |
Standard paper size such as A4 or Letter. | Sideways source pixels. |
landscape |
Page orientation. | Photo orientation inside the page. |
preferCSSPageSize |
Whether CSS @page dimensions take precedence. |
EXIF interpretation. |
printBackground |
Printing background colors and images. | Image metadata. |
scale |
Overall print scaling. | Rotation or mirroring. |
waitForFonts |
Whether PDF generation waits for fonts. | Image decoding unless you wait separately. |
Choose page size and scaling after the image is upright. A landscape PDF page is not a substitute for orienting a portrait photograph.
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Edge cases you should handle
Mirrored orientations
EXIF defines mirrored variants as well as rotations. Sharp’s autoOrient() handles both, whereas a hand-written “rotate 90 degrees” rule may leave a selfie mirrored.
Metadata beyond EXIF Orientation
Sharp’s documented operation considers the EXIF Orientation tag. If your asset carries XMP tiff:Orientation or a vendor-specific instruction, inspect and normalize that metadata separately.
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If downstream consumers require PNG, replace .jpeg({ quality: 90 }) with .png(). The essential operation is .autoOrient(); the output format is independent.
Repeated processing
Normalize once at ingestion and keep the canonical derivative. Running a second orientation transform after the tag has been removed should not rotate it again, but combining normalization with a CSS transform can.
Large photos and memory
Data URLs duplicate the encoded image inside the HTML and can increase peak memory. Prefer a temporary file or streamed/authenticated URL for multi-megapixel uploads, and delete temporary files after the PDF job. Re-encoding at a suitable quality reduces PDF size; do not reduce dimensions below the print resolution your document needs.
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Verification recipe
- Create or select a fixture JPEG with a nontrivial EXIF Orientation value, such as a portrait whose stored raster is landscape.
- Generate one PDF from the original and one from the
autoOrient()output using identical HTML and PDF options. - Inspect the rendered pages, or rasterize both PDFs for a pixel-level comparison.
- Confirm that the normalized PDF is upright and remains upright after EXIF metadata is stripped from the derivative.
This test distinguishes an orientation problem from unrelated layout, clipping, or resource-loading failures.
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Troubleshooting
The photo is still sideways
- Check that the HTML references the normalized buffer or file, not the original upload.
- Inspect the source metadata; the orientation may be in XMP rather than EXIF.
- Remove any CSS
rotate()applied to the same image. - Confirm the PDF worker is running the Sharp version and code path you expect.
The image is missing or blank
- Wait for
loadanddecode()before printing. - Check file URL permissions, authentication, DNS, TLS, and response status from inside the browser environment.
- For lazy images, trigger loading before the readiness check.
Orientation works in the browser but not in the PDF
- Remember that PDF generation uses print media by default; put the CSS rule in print styles or call
emulateMediaType(). - Prefer pixel normalization so the result does not depend on Chromium’s print-time metadata handling.
Output quality or file size changed
Re-encoding is expected. Adjust JPEG quality or use PNG when lossless output is required, then verify that the resulting dimensions and visual quality meet your print requirements.
The process times out
Separate image processing time from page navigation time in logs. Resize or normalize oversized uploads before launching the browser, increase the navigation timeout only for known-slow endpoints, and close the browser in a finally block so failed jobs do not leak processes.
Performance, reliability, and cost choices
- Normalize at upload: pays the Sharp cost once and makes every later renderer deterministic.
- Normalize per PDF: avoids storing derivatives but repeats CPU work and can increase latency under load.
- Data URL: simplest isolation for one image, with higher HTML memory use.
- File or HTTP URL: better for many images, but requires access control and explicit readiness checks.
- CSS only: smallest code change, but dependent on the browser and print path honoring metadata.
Measure your own workload rather than assuming a fixed processing time: image dimensions, compression, concurrent jobs, storage, and browser startup all affect latency and resource use.
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FAQ
Does removing EXIF metadata alone rotate the photo?
No. Removing the tag only prevents a later decoder from seeing the instruction. The pixels must first be rotated or mirrored into their canonical order.
Can I fix an already-generated PDF?
Usually you must transform the embedded image and regenerate the PDF. Rotating the PDF page changes page geometry, not necessarily the image’s orientation within its content.
Should I preserve the original upload?
Yes. Keep the original for audit or future processing, and store a separate normalized derivative for rendering.
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