Compress Scanned PDFs — Phone Photos and Flatbed Packets
Observation: once a PDF is a stack of photos, text-only tricks do almost nothing. You have to re-encode the images.
Scans are often IDs, leases, and medical forms. Process them in the browser. Do not upload a stack of photos of your life to compress it.
A scanned PDF commonly stores each paper page as raster image data, which can dominate file size. Some scans also contain an OCR text layer, forms, or other structures. BytesPDF targets supported embedded images. Start with Recommended and verify the visible scan, searchability, forms, and other structures your workflow needs.
Scanned PDF Submission Checks
Use these checkpoints with the destination's current instructions. Requirements can vary by account, institution, region, document type, and workflow. BytesPDF does not verify or guarantee recipient acceptance. Page reviewed . See the browser-local processing architecture.
| Portal / Recipient | Requirement / check |
|---|---|
| Destination's current file-size rule | Confirm in the exact portal, account, or recipient instructions |
| Accepted file type and PDF rules | Check format, encryption, signature, page, and version requirements |
| Filename and account rules | Use the requested naming and submission workflow |
| Legibility and document integrity | Inspect every required page, field, link, mark, and image |
| Submission evidence | Keep the original and save the portal receipt or confirmation |
Which Compression Mode Should You Pick?
Three modes — pick based on what the recipient needs to do with the file.
✅ Recommended — default for scans
Re-encodes page images aggressively. Handwriting and stamps stay readable at screen zoom.
🟡 Less — archival scans
Keep Less for faded ink, pencil, or stamps you may enlarge later.
🔴 Extreme — last resort
Can posterize pencil and pale blue ink. Check a zoomed page before you send.
Before compressing a high-stakes document
Compression rewrites the PDF. BytesPDF rejects files containing a cryptographic signature because any rewrite would invalidate it. Keep digitally signed files and required PDF/A archival masters unchanged. Bookmarks, links, forms, annotations, accessibility tags, and color profiles are preserved where the PDF library can retain them, but always inspect the downloaded copy before filing or submitting it.
PDF Compression Core
Recompress supported PDF images locally with an adjustable quality and size trade-off.
or drag and drop PDFs here
PDF files only · Max 150MB per file · Up to 10 at a time
Frequently Asked Questions
Scenario-specific answers. For general PDF help, see our FAQ.
Why are scanned PDFs so large?
Will OCR still work after compression?
Phone camera vs flatbed?
Color or grayscale?
Does this deskew pages?
Can I compress a 200-page scan on a phone?
Editorial review: Technical content reviewed by Zeeshan, lead engineer at BytesPDF. Recipient requirements change; confirm the current instructions in the exact destination workflow.
Last reviewed: . We update this page when provider guidance or tool behavior changes.
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Limits and examples are informational and may vary. Confirm the recipient's current requirements before submitting a high-stakes document. Digitally signed or archival-conformance files should be submitted in their original form.