mirror of
https://github.com/alam00000/bentopdf.git
synced 2026-11-11 01:14:35 +01:00
539 lines
20 KiB
HTML
539 lines
20 KiB
HTML
<!doctype html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="UTF-8" />
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
|
|
|
|
<title>Deskew PDF Online Free - Straighten Scanned PDFs | BentoPDF</title>
|
|
<meta
|
|
name="title"
|
|
content="Deskew PDF Online Free - Straighten Scanned PDFs | BentoPDF"
|
|
/>
|
|
<meta
|
|
name="description"
|
|
content="Automatically straighten tilted scanned pages using OpenCV. Free, no uploads, no signup. Runs entirely in your browser."
|
|
/>
|
|
<meta
|
|
name="keywords"
|
|
content="deskew pdf, straighten pdf, fix tilted scan, online pdf"
|
|
/>
|
|
<meta name="author" content="BentoPDF" />
|
|
<meta
|
|
name="robots"
|
|
content="index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1"
|
|
/>
|
|
|
|
<link rel="canonical" href="https://www.bentopdf.com/deskew-pdf" />
|
|
|
|
<meta property="og:type" content="website" />
|
|
<meta property="og:url" content="https://www.bentopdf.com/deskew-pdf" />
|
|
<meta
|
|
property="og:title"
|
|
content="Deskew PDF Online Free - Straighten Scanned PDFs | BentoPDF"
|
|
/>
|
|
<meta
|
|
property="og:description"
|
|
content="Automatically straighten tilted scanned pages using OpenCV. Free, no uploads, no signup. Runs entirely in your browser."
|
|
/>
|
|
<meta
|
|
property="og:image"
|
|
content="https://www.bentopdf.com/images/og-deskew-pdf.png"
|
|
/>
|
|
<meta property="og:image:width" content="1200" />
|
|
<meta property="og:image:height" content="630" />
|
|
<meta property="og:site_name" content="BentoPDF" />
|
|
|
|
<meta name="twitter:card" content="summary_large_image" />
|
|
<meta name="twitter:url" content="https://www.bentopdf.com/deskew-pdf" />
|
|
<meta name="twitter:title" content="Deskew PDF Free" />
|
|
<meta
|
|
name="twitter:description"
|
|
content="Automatically straighten tilted scanned pages using OpenCV. Free, no uploads, no signup. Runs entirely in your browser."
|
|
/>
|
|
<meta
|
|
name="twitter:image"
|
|
content="https://www.bentopdf.com/images/twitter-deskew-pdf.png"
|
|
/>
|
|
<meta name="twitter:site" content="@BentoPDF" />
|
|
|
|
<meta name="mobile-web-app-capable" content="yes" />
|
|
<meta name="apple-mobile-web-app-capable" content="yes" />
|
|
<meta name="apple-mobile-web-app-title" content="Deskew PDF" />
|
|
|
|
<link href="/src/css/styles.css" rel="stylesheet" />
|
|
<link rel="manifest" href="/site.webmanifest" />
|
|
<link rel="icon" type="image/svg+xml" href="/images/favicon.svg" />
|
|
<link
|
|
rel="icon"
|
|
type="image/png"
|
|
sizes="192x192"
|
|
href="/images/favicon-192x192.png"
|
|
/>
|
|
<link
|
|
rel="icon"
|
|
type="image/png"
|
|
sizes="512x512"
|
|
href="/images/favicon-512x512.png"
|
|
/>
|
|
<link
|
|
rel="apple-touch-icon"
|
|
sizes="180x180"
|
|
href="/images/apple-touch-icon.png"
|
|
/>
|
|
<link rel="icon" href="/favicon.ico" sizes="32x32" />
|
|
</head>
|
|
|
|
<body class="antialiased bg-gray-900">
|
|
{{> navbar }}
|
|
|
|
<div
|
|
id="uploader"
|
|
class="min-h-screen flex flex-col items-center justify-start py-12 p-4 bg-gray-900"
|
|
>
|
|
<div
|
|
id="tool-uploader"
|
|
class="bg-gray-800 rounded-xl shadow-xl px-4 py-8 md:p-8 max-w-2xl w-full text-gray-200 border border-gray-700"
|
|
>
|
|
<button
|
|
id="back-to-tools"
|
|
class="flex items-center gap-2 text-indigo-300 hover:text-indigo-400 mb-6 font-semibold"
|
|
>
|
|
<i data-lucide="arrow-left" class="cursor-pointer"></i>
|
|
<span class="cursor-pointer" data-i18n="tools.backToTools"
|
|
>Back to Tools</span
|
|
>
|
|
</button>
|
|
|
|
<h1
|
|
class="text-2xl font-bold text-white mb-2"
|
|
data-i18n="tools:deskewPdf.name"
|
|
>
|
|
Deskew PDF
|
|
</h1>
|
|
<p class="text-gray-400 mb-6" data-i18n="tools:deskewPdf.subtitle">
|
|
Automatically straighten tilted scanned pages using OpenCV.
|
|
</p>
|
|
|
|
<div
|
|
id="drop-zone"
|
|
class="relative flex flex-col items-center justify-center w-full h-48 md:h-64 border-2 border-dashed border-gray-600 rounded-xl cursor-pointer bg-gray-900 hover:bg-gray-700 transition-colors duration-300"
|
|
>
|
|
<div class="flex flex-col items-center justify-center pt-5 pb-6">
|
|
<i class="ph ph-upload-simple text-4xl mb-3 text-gray-400"></i>
|
|
<p class="mb-2 text-sm text-gray-400">
|
|
<span class="font-semibold" data-i18n="upload.clickToSelect"
|
|
>Click to select files</span
|
|
>
|
|
<span data-i18n="upload.orDragAndDrop">or drag and drop</span>
|
|
</p>
|
|
<p
|
|
class="text-xs text-gray-500"
|
|
data-i18n="upload.hints.oneOrMorePdfs"
|
|
>
|
|
One or more PDF files
|
|
</p>
|
|
<p class="text-xs text-gray-500" data-i18n="upload.filesNeverLeave">
|
|
Your files never leave your device.
|
|
</p>
|
|
</div>
|
|
<input
|
|
id="file-input"
|
|
type="file"
|
|
class="absolute top-0 left-0 w-full h-full opacity-0 cursor-pointer"
|
|
accept="application/pdf"
|
|
multiple
|
|
/>
|
|
</div>
|
|
|
|
<div id="file-controls" class="hidden mt-4 flex gap-3">
|
|
<button
|
|
id="add-more-btn"
|
|
class="btn bg-indigo-600 hover:bg-indigo-700 text-white font-semibold px-4 py-2 rounded-lg flex items-center gap-2"
|
|
>
|
|
<i data-lucide="plus"></i> <span>Add More Files</span>
|
|
</button>
|
|
<button
|
|
id="clear-files-btn"
|
|
class="btn bg-gray-700 hover:bg-gray-600 text-white font-semibold px-4 py-2 rounded-lg flex items-center gap-2"
|
|
>
|
|
<i data-lucide="trash-2"></i> <span>Clear All</span>
|
|
</button>
|
|
</div>
|
|
|
|
<div id="file-display-area" class="mt-4 space-y-2"></div>
|
|
|
|
<div id="deskew-options" class="hidden mt-6 space-y-6">
|
|
<div>
|
|
<label
|
|
for="deskew-threshold"
|
|
class="block mb-2 text-sm font-medium text-gray-300"
|
|
>Skew Threshold (degrees)</label
|
|
>
|
|
<select
|
|
id="deskew-threshold"
|
|
class="w-full bg-gray-700 border border-gray-600 text-white rounded-lg p-2.5 focus:ring-indigo-500 focus:border-indigo-500"
|
|
>
|
|
<option value="0.1">0.1° (Very Sensitive)</option>
|
|
<option value="0.5" selected>0.5° (Default)</option>
|
|
<option value="1.0">1.0° (Normal)</option>
|
|
<option value="2.0">2.0° (Less Sensitive)</option>
|
|
</select>
|
|
<p class="text-xs text-gray-500 mt-1">
|
|
Pages with skew below this threshold won't be corrected.
|
|
</p>
|
|
</div>
|
|
|
|
<div>
|
|
<label
|
|
for="deskew-dpi"
|
|
class="block mb-2 text-sm font-medium text-gray-300"
|
|
>Processing Quality (DPI)</label
|
|
>
|
|
<select
|
|
id="deskew-dpi"
|
|
class="w-full bg-gray-700 border border-gray-600 text-white rounded-lg p-2.5 focus:ring-indigo-500 focus:border-indigo-500"
|
|
>
|
|
<option value="100">100 (Fast)</option>
|
|
<option value="150" selected>150 (Default)</option>
|
|
<option value="200">200 (Better)</option>
|
|
<option value="300">300 (Best Quality)</option>
|
|
</select>
|
|
</div>
|
|
|
|
<button id="process-btn" class="btn-gradient w-full mt-4">
|
|
Deskew PDF
|
|
</button>
|
|
</div>
|
|
|
|
<div id="results-area" class="hidden mt-6 p-4 bg-gray-700 rounded-lg">
|
|
<h3 class="text-lg font-semibold text-white mb-3">Deskew Results</h3>
|
|
<div class="grid grid-cols-2 gap-4 text-sm">
|
|
<div>
|
|
<span class="text-gray-400">Total Pages:</span>
|
|
<span id="result-total" class="text-white ml-2">-</span>
|
|
</div>
|
|
<div>
|
|
<span class="text-gray-400">Pages Corrected:</span>
|
|
<span id="result-corrected" class="text-white ml-2">-</span>
|
|
</div>
|
|
</div>
|
|
<div id="angles-list" class="mt-3 max-h-32 overflow-y-auto"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div
|
|
id="loader-modal"
|
|
class="hidden fixed inset-0 bg-black bg-opacity-75 flex items-center justify-center z-50"
|
|
>
|
|
<div
|
|
class="bg-gray-800 p-8 rounded-lg flex flex-col items-center gap-4 border border-gray-700 shadow-xl"
|
|
>
|
|
<div class="solid-spinner"></div>
|
|
<p id="loader-text" class="text-white text-lg font-medium">
|
|
Processing...
|
|
</p>
|
|
</div>
|
|
</div>
|
|
|
|
<div
|
|
id="alert-modal"
|
|
class="fixed inset-0 bg-gray-900 bg-opacity-90 flex items-center justify-center z-50 hidden"
|
|
>
|
|
<div
|
|
class="bg-gray-800 rounded-lg shadow-xl p-6 max-w-sm w-full border border-gray-700"
|
|
>
|
|
<h3 id="alert-title" class="text-xl font-bold text-white mb-2">
|
|
Alert
|
|
</h3>
|
|
<p id="alert-message" class="text-gray-300 mb-6"></p>
|
|
<button
|
|
id="alert-ok"
|
|
class="w-full bg-indigo-600 hover:bg-indigo-700 text-white font-semibold py-2 px-4 rounded-lg transition-colors duration-200"
|
|
>
|
|
OK
|
|
</button>
|
|
</div>
|
|
</div>
|
|
|
|
<section class="max-w-4xl mx-auto px-4 py-12">
|
|
<h2
|
|
class="text-2xl md:text-3xl font-bold text-white mb-8 text-center"
|
|
data-i18n="howItWorks.title"
|
|
>
|
|
How It Works
|
|
</h2>
|
|
<div class="space-y-6">
|
|
<div class="flex items-start gap-4">
|
|
<div
|
|
class="flex-shrink-0 w-10 h-10 bg-indigo-600 rounded-full flex items-center justify-center text-white font-bold"
|
|
>
|
|
1
|
|
</div>
|
|
<div class="flex-1">
|
|
<h3 class="text-lg font-semibold text-white mb-1">Upload PDF</h3>
|
|
<p class="text-gray-400">
|
|
Select your scanned PDF with tilted pages
|
|
</p>
|
|
</div>
|
|
</div>
|
|
<div class="flex items-start gap-4">
|
|
<div
|
|
class="flex-shrink-0 w-10 h-10 bg-indigo-600 rounded-full flex items-center justify-center text-white font-bold"
|
|
>
|
|
2
|
|
</div>
|
|
<div class="flex-1">
|
|
<h3 class="text-lg font-semibold text-white mb-1">Auto-Detect</h3>
|
|
<p class="text-gray-400">OpenCV analyzes and detects skew angles</p>
|
|
</div>
|
|
</div>
|
|
<div class="flex items-start gap-4">
|
|
<div
|
|
class="flex-shrink-0 w-10 h-10 bg-indigo-600 rounded-full flex items-center justify-center text-white font-bold"
|
|
>
|
|
3
|
|
</div>
|
|
<div class="flex-1">
|
|
<h3 class="text-lg font-semibold text-white mb-1">Download</h3>
|
|
<p class="text-gray-400">Get your straightened PDF instantly</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
|
|
<section class="max-w-6xl mx-auto px-4 py-12">
|
|
<h2
|
|
class="text-2xl md:text-3xl font-bold text-white mb-6 text-center"
|
|
data-i18n="relatedTools.title"
|
|
>
|
|
Related PDF Tools
|
|
</h2>
|
|
<div class="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-6 gap-4">
|
|
<a
|
|
href="rasterize-pdf.html"
|
|
class="block bg-gray-800 p-4 rounded-lg hover:bg-gray-700 transition-colors border border-gray-700"
|
|
>
|
|
<h3 class="text-white font-semibold mb-1">Rasterize PDF</h3>
|
|
<p class="text-gray-400 text-sm">Convert to image-based PDF</p>
|
|
</a>
|
|
<a
|
|
href="compress-pdf.html"
|
|
class="block bg-gray-800 p-4 rounded-lg hover:bg-gray-700 transition-colors border border-gray-700"
|
|
>
|
|
<h3 class="text-white font-semibold mb-1">Compress PDF</h3>
|
|
<p class="text-gray-400 text-sm">Reduce PDF file size</p>
|
|
</a>
|
|
<a
|
|
href="repair-pdf.html"
|
|
class="block bg-gray-800 p-4 rounded-lg hover:bg-gray-700 transition-colors border border-gray-700"
|
|
>
|
|
<h3 class="text-white font-semibold mb-1">Repair PDF</h3>
|
|
<p class="text-gray-400 text-sm">Fix corrupted PDF files</p>
|
|
</a>
|
|
<a
|
|
href="rotate-pdf.html"
|
|
class="block bg-gray-800 p-4 rounded-lg hover:bg-gray-700 transition-colors border border-gray-700"
|
|
>
|
|
<h3 class="text-white font-semibold mb-1">Rotate PDF</h3>
|
|
<p class="text-gray-400 text-sm">Rotate PDF pages</p>
|
|
</a>
|
|
<a
|
|
href="ocr-pdf.html"
|
|
class="block bg-gray-800 p-4 rounded-lg hover:bg-gray-700 transition-colors border border-gray-700"
|
|
>
|
|
<h3 class="text-white font-semibold mb-1">OCR PDF</h3>
|
|
<p class="text-gray-400 text-sm">Make PDF searchable</p>
|
|
</a>
|
|
</div>
|
|
</section>
|
|
|
|
<section class="max-w-4xl mx-auto px-4 py-12">
|
|
<h2
|
|
class="text-2xl md:text-3xl font-bold text-white mb-6 text-center"
|
|
data-i18n="faq.sectionTitle"
|
|
>
|
|
Frequently Asked Questions
|
|
</h2>
|
|
<div class="faq-list">
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
How does the tool detect that a page is tilted?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
Each page is rendered to an image at the DPI you choose, then OpenCV
|
|
analyzes it: it fits a minimum-area rectangle around the dark pixels
|
|
and, as a fallback, measures the angle of dominant text lines with a
|
|
Hough transform. The resulting angle is what the results panel
|
|
reports for that page.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
What does the Skew Threshold setting do?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
Pages whose detected tilt is below the threshold are left alone. The
|
|
default of 0.5 degrees catches visible tilt without touching pages
|
|
that are already straight; drop it to 0.1 degrees when you want the
|
|
tightest alignment before OCR, or raise it to 1 or 2 degrees to
|
|
correct only clearly crooked pages.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
Does deskewing keep the text selectable?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
No. Every page in the output, including pages that didn't need
|
|
correction, is written as an image at the processing DPI, so any
|
|
existing text layer is lost. Run the result through
|
|
<a href="/ocr-pdf" class="text-indigo-300 hover:text-indigo-400"
|
|
>OCR PDF</a
|
|
>
|
|
afterward if you need searchable text; OCR works better on
|
|
straightened pages anyway.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
Which DPI should I use when deskewing a scan?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
150 DPI is fast and accurate for ordinary letter-sized scans. Use
|
|
200 or 300 DPI for small print or fine detail, and 100 DPI when
|
|
speed matters more than precision. The setting also controls the
|
|
resolution of the output pages, so higher values produce larger
|
|
files.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
Will the page size change after rotation?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
Output pages keep the original page dimensions. The rotated image is
|
|
padded with white in the corners exposed by the rotation and then
|
|
fitted onto the page, so content may shrink by a hair but nothing is
|
|
pushed off the sheet.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
Does it work on every kind of scan?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
It works best on pages with clear horizontal lines of text. Pages
|
|
that are mostly photos, drawings, or diagonal design elements give
|
|
the detector little to measure, so the angle can be off; check the
|
|
results panel and keep your original for those.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
How do I know which pages were corrected?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
After processing, a results panel lists every page with its detected
|
|
angle and marks the ones that were rotated; pages under the
|
|
threshold show their angle but are labeled as untouched. If you
|
|
queued several PDFs, each downloads under its original name and the
|
|
panel shows the last file processed.
|
|
</p>
|
|
</details>
|
|
<details class="faq-d">
|
|
<summary class="faq-d-q">
|
|
Are my scans uploaded for processing?
|
|
<i data-lucide="plus" class="faq-d-icon"></i>
|
|
</summary>
|
|
<p class="faq-d-a">
|
|
No. The PDF rendering and the OpenCV analysis both run in your
|
|
browser through WebAssembly. The engine is downloaded the first time
|
|
you use it, but your documents never leave your computer.
|
|
</p>
|
|
</details>
|
|
</div>
|
|
</section>
|
|
|
|
{{> footer }}
|
|
<script type="module" src="/src/js/utils/lucide-init.ts"></script>
|
|
<script type="module" src="/src/js/utils/full-width.ts"></script>
|
|
<script type="module" src="/src/js/utils/simple-mode-footer.ts"></script>
|
|
<script type="module" src="/src/js/logic/deskew-pdf-page.ts"></script>
|
|
<script type="module" src="/src/js/mobileMenu.ts"></script>
|
|
<script type="module" src="/src/js/main.ts"></script>
|
|
|
|
<script type="application/ld+json">
|
|
{
|
|
"@context": "https://schema.org",
|
|
"@type": "SoftwareApplication",
|
|
"name": "Deskew PDF - BentoPDF",
|
|
"applicationCategory": "PDF Tool",
|
|
"operatingSystem": "Any - Web Browser",
|
|
"offers": {
|
|
"@type": "Offer",
|
|
"price": "0",
|
|
"priceCurrency": "USD"
|
|
}
|
|
}
|
|
</script>
|
|
|
|
<script type="application/ld+json">
|
|
{
|
|
"@context": "https://schema.org",
|
|
"@type": "HowTo",
|
|
"name": "How to deskew PDF online",
|
|
"description": "Learn how to straighten tilted pages in scanned PDFs",
|
|
"step": [
|
|
{
|
|
"@type": "HowToStep",
|
|
"position": 1,
|
|
"name": "Upload PDF",
|
|
"text": "Select your scanned PDF with tilted pages"
|
|
},
|
|
{
|
|
"@type": "HowToStep",
|
|
"position": 2,
|
|
"name": "Auto-Detect",
|
|
"text": "OpenCV analyzes and detects skew angles"
|
|
},
|
|
{
|
|
"@type": "HowToStep",
|
|
"position": 3,
|
|
"name": "Download",
|
|
"text": "Get your straightened PDF instantly"
|
|
}
|
|
]
|
|
}
|
|
</script>
|
|
|
|
<script type="application/ld+json">
|
|
{
|
|
"@context": "https://schema.org",
|
|
"@type": "BreadcrumbList",
|
|
"itemListElement": [
|
|
{
|
|
"@type": "ListItem",
|
|
"position": 1,
|
|
"name": "Home",
|
|
"item": "https://www.bentopdf.com"
|
|
},
|
|
{
|
|
"@type": "ListItem",
|
|
"position": 2,
|
|
"name": "Deskew PDF",
|
|
"item": "https://www.bentopdf.com/deskew-pdf"
|
|
}
|
|
]
|
|
}
|
|
</script>
|
|
</body>
|
|
</html>
|