Scanned PDFs
Compress scanned PDF files
Scanned PDFs are image-heavy by nature and often start at large file sizes — particularly multi-page documents from a flatbed scanner or phone camera. They compress well under a balanced preset, but the ideal target depends on scan resolution and page count.
At a glance
- Use this page to compress files quickly with a guided workflow.
- Accepted input: .pdf.
- Output: downloadable file generated in-browser for supported workflows.
- Upload Choose your file
- Process Runs locally
- Download Save result
Drop your file here
or tap to browse · accepts .pdf
Runs in your browser. No file uploads for supported tools.
Best on desktop for 100MB+ files · mobile recommended under ~100MB.
How local processing works
- Your PDF is processed in your browser using local JavaScript libraries.
- PDFWhisk does not upload your file to a processing server for supported tools.
- Only normal page assets load from the site (HTML/CSS/JS), not your document contents.
Selected files
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Ready to download
Support: hello@pdfwhisk.com (reply in ~24h)
Security & privacy detailsHow this tool helps
Reduce the file size of your PDF documents instantly, right in your browser. Our PDF compressor uses smart optimization to shrink files by up to 90% while preserving text clarity, image quality, and formatting. Perfect for email attachments, uploading to portals, or saving storage space. Unlike other tools, your PDF never leaves your device - all compression happens locally using your browser's processing power. Choose from three quality levels: high compression for maximum size reduction, balanced for the best mix of quality and size, or low compression to keep near-original quality. Works with scanned documents, reports, presentations, and any PDF file. Use it when you need to split large PDFs for portal limits, compress PDFs on iPhone, reduce email attachment size.
Best for
How it works
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1
Open PDFWhisk Compress tool
Visit PDFWhisk in your browser and open the Compress PDF tool. No account or app needed — it runs entirely in your browser.
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2
Add your PDF
Drag your PDF file onto the page, or click to browse and select it from your device. Your file is not uploaded to any server.
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3
Choose compression level
Select Light (keeps quality high) or Heavy (reduces file size most). For most upload portals, Medium works well.
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4
Compress the PDF
Click Compress and wait a few seconds while your browser processes the file locally.
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5
Download the result
Click Download to save your compressed PDF. The original file is unchanged.
Intent guide
Compress scanned PDF files is a common task with specific constraints: upload limits, mobile workflows, and privacy concerns. This guide is written for that intent and pairs directly with the tool above so you can act immediately.
When to use a 10MB PDF target
If your upload form, email system or job portal rejects large documents, targeting 10MB gives you a practical goal instead of guessing. Many PDF tools only offer vague quality levels, which forces you to re-run compression several times. PDFWhisk is designed around the outcome you actually need: a file that clears a known limit with acceptable readability.
A reliable workflow (without trashing readability)
Start by checking whether the PDF is image-heavy (scans, screenshots, photos) or mostly text. Image-heavy documents usually compress well; text-heavy PDFs may already be efficient and can show limited savings. Use the target preset first, then review the before/after size and quality hint. If the tool warns that your target would require heavy quality loss, step up to the next target or split the file into smaller parts.
Common UK use cases and what to watch for
People most often use this for CV uploads, tenancy documents, application forms, bank statements, and supporting evidence PDFs. For job applications, always open the output and zoom in on small text. For scanned statements and forms, check signatures, dates and reference numbers remain readable. If you're emailing the file, compress after you remove unnecessary pages to avoid over-compressing.
Why this page exists (intent-specific guidance, not generic fluff)
This page is focused on the real job: getting a PDF under 10MB (or close to it) with minimal friction, especially on mobile. Use the preset call-to-action above, then follow the related actions below if you need to split, delete pages or merge documents before final upload.
Before you upload/share
- Review the output before sending or uploading.
- Keep the original file until the recipient or portal accepts the document.
- Use the related tools below if you need to merge, split or compress as a follow-up step.
Frequently asked questions
Why are scanned PDFs so large?
Scanned PDFs store each page as a high-resolution image rather than editable text, which makes them significantly larger than digitally created PDFs of the same content.
How much can I compress a scanned PDF?
Scanned PDFs often compress by 40–70% with a balanced preset. High-resolution scans see the biggest reductions. Review the output to confirm scan details remain readable.
Will compressed scans still be legible for official submissions?
Yes if you use a balanced or low preset. Check that handwriting, stamps, and any identification details are clearly visible before uploading to an official portal.
What to do next
Chain tools together for a complete workflow.
Popular searches for this tool
Intent-specific pages for common real-world tasks (upload limits, email attachments, iPhone workflows, and privacy-first processing).