How to Compress a PDF Without Losing Readability

This PDF compressor runs entirely in your browser. Your file never leaves your device, so contracts, IDs and personal documents stay private. It shrinks file size by recompressing embedded images while leaving text as real characters, so pages stay sharp, selectable and searchable. Image-heavy and scanned PDFs often save 80% or more. Text-only files usually change far less, because there was little image data to reclaim. Files up to 10 MB are supported. Pick Light, Balanced or Strong, compress, then download a smaller copy. The original on your device is never overwritten.

Key benefits

• Image-heavy and scanned PDFs often shrink by 80% or more with Strong compression.
• Runs 100% in your browser. Nothing is uploaded to a server.
• Text stays sharp, selectable and searchable. Pages are not flattened into blurry images.
• Page count, order and content stay the same. Only embedded images are recompressed.
• Free to use with no account, no watermark and no daily cap.
• Accepts PDFs up to 10 MB, which covers most email attachments and form uploads.

How to use it, step by step

1. Add a PDF (max 10 MB). Drop the file in or browse to select it. Only PDFs up to 10 MB are accepted. Everything stays on your device.
2. Choose a compression level. Light keeps the highest image quality. Balanced is a good default. Strong aims for the smallest file, often 80%+ smaller on scans and photo-heavy PDFs.
3. Compress in your browser. Processing happens locally. Progress shows while images are recompressed. Text and page structure are left intact.
4. Download the smaller PDF. Compare original and compressed sizes, then save the new file. Your original remains unchanged.

Common use cases

• Shrinking a scanned contract or ID so it fits an email attachment limit.
• Meeting a portal upload cap for visas, universities or job applications.
• Reducing a report full of photos before sending it to a client.
• Compressing receipts and invoices before an expense claim.
• Making a large PDF practical to share on a slow or metered connection.

Pro tips

• Use Strong for scans and photo-heavy PDFs when you need the biggest size drop, often 80%+.
• Use Light or Balanced when the PDF must stay close to print quality.
• Keep files under 10 MB. If yours is larger, split it first or remove unused pages.
• Compress once at the end. Running the same file through Strong repeatedly can soften images without much extra saving.
• For strict upload limits, try Strong first, then split or remove pages if the file is still too large.

Common mistakes to avoid

• Expecting a text-only PDF to shrink by 80%. Most of the size in those files is already efficient.
• Uploading a file over 10 MB. The tool rejects anything larger.
• Assuming compression removes pages. It does not. Only image encoding changes.
• Trying a password-protected PDF first. Unlock it with the PDF Unlocker, then compress.
• Compressing the same file over and over hoping for more savings. After the first Strong pass there is usually little left to reclaim.

Frequently asked questions

How do I compress a PDF?

Add a PDF up to 10 MB, choose Light, Balanced or Strong, then download the result. Compression runs in your browser. Only embedded images are recompressed, so text and pages stay intact.

Is this PDF compressor free?

Yes. There is no account, trial, daily cap or watermark. Processing happens in your browser, so nothing is uploaded.

What is the maximum file size?

10 MB. Files larger than that are rejected. If you need to go smaller first, split the PDF or remove pages you do not need.

Does my PDF get uploaded to a server?

No. Compression runs entirely in your browser on your device. The file never leaves your computer.

Will compressing make text blurry?

No. Text stays as real characters and fonts, so it remains sharp, selectable and searchable. Only embedded images are recompressed.

How much smaller will my file get?

Image-heavy and scanned PDFs often save 80% or more with Strong. A text-only document may barely change, because there was little large image data to compress.

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Ready to get started? Open the PDF Compressor and try it now - completely free.