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Private by design · 100% on-device

Compress PDF Files

Shrink your PDF's file size right in your browser. Re-encode image-heavy pages without losing text quality and download a smaller PDF in seconds — no uploads, no sign-up, no watermark.

Drop a PDF to compress

Reduce file size by re-encoding the pages. Great for scans and image-heavy PDFs.

  • No uploads
  • No sign-up
  • No watermark
  • Works offline

How it works

How to compress a PDF

Three quick steps, all in your browser. Your file never leaves your device.

  1. 01

    Add your PDF

    Drop a PDF into the box above or browse for it. The file loads straight into your browser — nothing is uploaded to a server.

  2. 02

    Pick a compression level

    Choose Smallest, Balanced, or Quality. Each setting re-encodes the embedded images to a target resolution while keeping text and vectors sharp.

  3. 03

    Compress and download

    Click Compress and save the smaller PDF instantly. You see exactly how much smaller it got — no watermark, no account, no upload wait.

Quality

Choose the right compression level

Each level re-encodes the images inside your PDF to a target resolution. Text and vector graphics are never touched, so they stay crisp whichever level you pick.

Smallest

~72 DPI

Smallest file size

Images are downsampled to about 72 DPI. Best for email attachments, web uploads, and anywhere a tight size limit matters most.

Recommended

Balanced

~150 DPI

The recommended default

Images are downsampled to about 150 DPI — a strong balance of small size and on-screen clarity. The right choice for most documents.

Quality

~300 DPI

Best visual quality

Images stay near 300 DPI for print-grade clarity, with modest size savings. Use it when the document still needs to look crisp on paper.

Real results

How much smaller will my PDF be?

It depends on what's inside. Scans and image-heavy files shrink the most; text-only PDFs are already compact. Here are typical results at the Balanced level.

Scanned multi-page report

18 MB~2 MB
~89% smaller

Image-heavy scans compress the most, since every page is essentially a photo that can be downsampled.

Image-rich slide deck

40 MB~6 MB
~85% smaller

Presentations packed with photos and screenshots shrink dramatically while staying clear on screen.

Photo-scanned contract

12 MB~1.5 MB
~87% smaller

Perfect for emailing signed paperwork that started life as a phone photo or flatbed scan.

Figures are illustrative — your savings depend on the images in your document. PDFNEO always compares the result against your original and keeps whichever is smaller, so you never download a larger file.

Features

Everything you can do with the PDF compressor

One focused tool for shrinking PDFs — without a subscription or a single upload.

Smart image downsampling

The compressor re-encodes embedded images to a target resolution, trimming the megabytes that bloat scans and image-heavy PDFs.

Text stays sharp and selectable

Only images are downsampled. Your text and vector graphics keep their original quality and remain fully selectable and searchable.

Three compression levels

Switch between Smallest, Balanced, and Quality to dial in the exact trade-off between file size and on-screen clarity.

See the savings instantly

After compressing you get the before and after size plus the percentage saved, so you always know what you are downloading.

Never larger than the original

If re-encoding would not actually shrink your file, PDFNEO keeps your original instead — you never download something bigger.

Works offline

Once this page has loaded you can disconnect entirely. Compression keeps running with zero network access.

Compress a PDF to a target size

Need to hit a specific limit — 100 KB for a form, 1 MB for email, 2 MB for a portal? Pick the level below as a starting point, compress, then check the exact result. How small a file gets depends on how many images it contains.

Under 100 KBSmallest

Aim for the Smallest level on a scanned or image-light document. Tight forms and short scans can land near 100 KB.

Under 200 KBSmallest

A common upload cap for portals and job applications. Smallest level handles most one- or two-page scans comfortably.

Under 500 KBSmallest / Balanced

Plenty of room for a multi-page scan while keeping text readable. Start with Balanced and drop to Smallest if needed.

Under 1 MBBalanced

The sweet spot for emailing reports and contracts. Balanced keeps pages crisp on screen at a fraction of the size.

Under 2 MBBalanced

Comfortable for image-rich decks and longer documents that still need to look sharp when opened.

Under 5 MBQuality

Use Quality when print clarity matters and the limit is generous — near 300 DPI with meaningful savings.

These are starting points, not guarantees. Text-only PDFs are already small, so there may be little to remove — PDFNEO always keeps whichever is smaller, your original or the compressed copy.

Privacy

Your PDFs never leave your device

Adobe, Smallpdf, and iLovePDF upload your file to a server to compress it — and several make you sign in first. PDFNEO does all of the compression locally, so contracts, scans, and records stay private.

Compress a PDF now

PDFNEO

  • Compresses files in your browser's memory
  • No file is ever uploaded to a server
  • No account, email, or sign-up required
  • No watermark and unlimited use

Typical cloud tools

  • Upload every document to a remote server
  • Often require an account to compress or save
  • May add watermarks or daily limits
  • Leave copies of your files in the cloud

Use cases

When to compress a PDF

Trimming file size is one of the most common PDF tasks — here is where it helps every day.

  • Shrink a PDF to fit under an email attachment limit
  • Compress a scanned report before sharing with a client
  • Reduce an image-heavy slide deck for faster uploads
  • Make a signed contract small enough to text or message
  • Trim a large portfolio so a website accepts it
  • Save storage by compressing archived documents

Why PDFNEO

Compress PDF vs. the alternatives

Most online compressors route your documents through their servers. PDFNEO was built the opposite way — and that changes everything about speed, privacy, and cost.

Truly private compression

Your file is compressed in your browser and never uploaded. Sensitive contracts and scans never touch a third-party server.

Instant, no round-trip

There is no upload wait and no download queue. Compression runs on your device — even on slow or metered connections.

Free with no catches

No daily limits, no premium gate, no watermark, and no account. Compress as many PDFs as your device can handle.

Keep going

Other PDF tools you might need

Keep working privately. Every PDFNEO tool runs in your browser with no uploads.

Merge PDF

Drag several PDFs together, set the order, and export a single clean document.

Open tool

Split PDF

Extract page ranges or slice a document into separate files in one pass.

Open tool

Organize PDF

Drag to reorder PDF pages, rotate or delete them, and select several at once, then rebuild.

Open tool

PDF to Images

Convert every PDF page to a high-resolution PNG, JPG, or WebP image — choose the pages, DPI, and quality, then download individually or as a ZIP.

Open tool

FAQ

Frequently asked questions

Everything about shrinking PDF file size with PDFNEO.

How do I compress a PDF for free?
Add your PDF to the compressor at the top of this page, choose a compression level, then click Compress and download the smaller file. It is completely free, with no sign-up and no watermark.
How do I reduce PDF file size without losing quality?
Pick the Quality level, which keeps images near 300 DPI while still trimming size, or Balanced for a strong mix of size and clarity. Text and vector graphics are never downsampled, so they stay perfectly sharp at every level.
Can I compress a PDF without uploading it?
Yes. Unlike most online tools, PDFNEO never uploads your file. Everything is compressed locally in your browser's memory, so sensitive contracts, scans, and records stay on your device.
How do I compress a PDF for email?
Choose the Smallest level for the biggest reduction, then check the resulting size shown after compression. This is the best option when you need a PDF to fit under a mailbox's attachment limit.
How do I compress a PDF to 100KB or 200KB?
Use the Smallest level to maximize the reduction, then look at the after size. Image-heavy and scanned PDFs can often reach a few hundred KB; how small a specific file gets depends on how many images it contains.
Why didn't my PDF get smaller?
PDFs that are mostly text or vector graphics are already compact, so there is little to remove. When re-encoding would not actually shrink the file, PDFNEO keeps your original so you never download something larger than you started with.
Does compressing a PDF reduce quality?
Compression downsamples embedded images to a target resolution, so photos and scans become slightly softer at the smaller levels. Text and vector graphics are untouched and stay crisp. Pick Quality or Balanced when image clarity matters most.
Can I compress a PDF on my phone?
Yes. The compressor is fully responsive and works in any modern mobile browser. Open your PDF, choose a level, compress, then save the smaller file to your device.
Is it safe to compress PDFs online with PDFNEO?
It is private by design. Your file is read straight from your device into your browser and is never sent to a server or third party. Close the tab and every trace of the document is gone.

Ready to compress your PDF?

Drop in a file and shrink it in seconds. No account, no upload, no watermark.

Compress PDF