Compress PDF to 5MB
Get a PDF under 5MB for uploads, forms and sharing. Free browser-based compression — no upload, no account.
Why 5MB is the practical target
Email can technically carry 20–25MB attachments, but the real world is stricter: upload forms, school portals, job application systems and messaging apps often cap files at 5–10MB, and corporate mail servers sometimes enforce 10MB. A PDF under 5MB simply goes through everywhere — no bounce messages, no "file too large" errors, no awkward follow-up emails. That is why 5MB, not the theoretical email maximum, is the target worth aiming for.
How the compression works
The tool above re-saves your PDF with compressed object streams using pdf-lib, running entirely in your browser. Think of it as repacking a suitcase: the contents are identical, but the wasted space inside the file format is gone. Text and vector graphics are preserved exactly, no pages are removed, and images are never downsampled. You get a before/after size on every result card, so there is no guessing.
When 5MB is out of reach
Most PDFs exported from Word, Google Docs or design tools shrink comfortably under 5MB. The stubborn cases are scanned documents and photo-heavy files: a scanned page is a full-page image, and lossless re-encoding cannot make image bytes disappear. If your file will not budge, try extracting only the pages you need — fewer pages means fewer megabytes — or accept the more ambitious 1MB target only if your document is text-heavy.
Sending it by email
Once the file is under 5MB, attach it normally. If you are fighting a specific mail server limit, read our guide to compressing PDFs for email, which covers Gmail, Outlook and corporate limits. For a general shrink with no fixed target, see reduce PDF file size.
Private by design
Small PDFs are usually the ones you share — invoices, applications, records. This compressor never uploads your file: everything is processed locally in your browser tab. Close the tab and nothing remains.
Frequently asked questions
Is 5MB guaranteed?
No. Compression is a lossless re-save with compressed object streams. Most office-exported PDFs shrink well, but scanned or photo-heavy files may stay above 5MB because the tool never downsamples images.
Why is 5MB a good target?
Many upload forms, school portals and messaging apps cap attachments well below email limits. A file under 5MB passes almost everywhere without a second thought.
Why did my file barely shrink?
Already-optimized PDFs have little redundancy left, and image bytes cannot be losslessly removed. The result card tells you exactly what happened.
Does compression change quality?
No. Text and vector content are preserved exactly; nothing is removed or downsampled.
Are encrypted PDFs supported?
No. Encrypted or password-protected PDFs are rejected; export an unlocked copy first.
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