How Do I Shrink a PDF Size? 6 Easy Methods (Free & Fast)

Why do PDFs get so large?

Before we fix the problem, understand the causes. A PDF can bloat because of:

• High‑resolution images – A single 300 DPI photo can be 5–10 MB.
• Scanned pages saved as color images – Instead of black‑and‑white text, each scan is a large JPEG.
• Embedded fonts – Custom fonts add 2–8 MB, even if you only use a few characters.
• Hidden metadata and old edits – PDFs can store revision history, annotations, and XML data.
• Uncompressed objects – Some PDFs aren't saved with object compression (enabled by default in modern creators).

Good news: All of these can be stripped or optimized without ruining the document's readability.

Method 1: Use a free online PDF shrinker (easiest & fastest)

Best for: Anyone who wants a quick, no‑installation solution. Works on any device with a browser.

1. Visit ratpdf.com/PDF/Compress.
2. Drag and drop your PDF (up to 100 MB).
3. Select a compression level:
   • Basic – minimal size reduction, fastest.
   • Recommended – best quality/size balance (usually shrinks by 60‑80%).
   • Maximum – smallest file, good for email or strict size limits.
4. Click ''Compress'' and download the smaller PDF.

Why it's safe: Files are encrypted with TLS, automatically deleted after 2 hours. For files under 20 MB, compression happens locally in your browser (WebAssembly) – nothing is uploaded.

Method 2: Shrink PDF on Windows (no internet required)

Best for: Offline use or sensitive documents that cannot be uploaded.

Using Microsoft Print to PDF (hidden trick)

1. Open the PDF in any reader: Edge, Chrome, Adobe Reader, or even Word.
2. Press Ctrl + P to open the print dialog.
3. In the printer selection, choose Microsoft Print to PDF.
4. Click ''More settings'' (or ''Properties'') and set:
   • Pages per sheet: 1
   • Quality: 150 DPI (or ''Standard'')
   • Optional: Check ''Print as image'' for better compatibility but larger file.
5. Click ''Print'' and save the new PDF.

This method re‑rasterizes the PDF at screen resolution. A 50 MB PDF often shrinks to 5–8 MB. Text remains sharp, but very fine graphics may soften slightly.

Using built‑in PDF optimizer in Adobe Acrobat Pro (paid)

If you have Acrobat Pro: File → Save as Other → Optimized PDF. Set images to 150 DPI, discard metadata, and compress text streams.

Method 3: Shrink PDF on Mac (Preview is free and powerful)

Best for: All Mac users. Preview comes with every Mac and has a hidden ''Reduce File Size'' filter.

1. Open the PDF in Preview (double‑click the file).
2. Click File → Export… (do not use ''Save As'').
3. In the ''Quartz Filter'' dropdown, select Reduce File Size.
4. Optional: If you need even smaller, choose ''Reduce File Size (Lossy)'' – but text may blur.
5. Choose a location and click ''Save''.

Preview's filter downsamples images to 96–150 DPI and applies JPEG compression. A 30 MB PDF often becomes 2‑4 MB with no noticeable quality loss for on‑screen viewing.

Method 4: Shrink PDF on iPhone or iPad (iOS built‑in)

Best for: Apple mobile users. iOS 15 and later include a system‑wide PDF shrinker.

1. Open the Files app and locate your PDF.
2. Tap the PDF to preview it.
3. Tap the Share icon (square with arrow).
4. Scroll down and tap Reduce File Size.
5. iOS will process the PDF and save a compressed copy next to the original (with ''(Reduced)'' in the name).

This method is extremely convenient and respects your privacy (all local). It reduces image quality but keeps text clear.

Alternative: Use our online compressor in Safari – it works identically and often gives more control.

Method 5: Shrink PDF on Android (using online tool)

Best for: Android users who don't want to install apps.

1. Open Chrome or your preferred browser.
2. Go to ratpdf.com/PDF/Compress.
3. Upload your PDF – for files under 20 MB, compression happens locally (no upload).
4. Choose compression level and download the shrunken file.

There is no built‑in PDF shrinker on Android, but our tool works perfectly in any modern browser. You can also install apps like ''PDF Compressor'' from the Play Store, but they often show ads or ask for payments.

Method 6: Shrink PDF by converting to another format (last resort)

If you absolutely need a tiny file and don't need to preserve PDF features (like forms or vector graphics), convert the PDF to a highly compressed image format:

• Convert to ZIP of JPEG images: Use any PDF to image converter (e.g., our PDF to Images tool). Then zip the images. This can reduce size drastically, but you lose searchable text.
• Convert to plain text: If you only need the words, use PDF to TXT conversion. A 20 MB PDF may become 50 KB of text.
• Use lossy WebP inside PDF: Some advanced tools (including ours) support WebP compression, which makes photos 30% smaller than JPEG at the same quality.

Comparison table: Which method should you use?

Real examples: How much can you shrink a PDF?

Example 1 (scanned contract): 50 pages, black and white, 300 DPI. Original: 28 MB. After our ''Maximum'' compression: 1.2 MB (95% reduction). Text remains perfectly readable because JBIG2 compression is lossless for monochrome.

Example 2 (color brochure): 20 pages, high‑res photos. Original: 45 MB. After ''Recommended'' compression: 6.8 MB (85% reduction). Photos look sharp on a laptop screen.

Example 3 (text report with charts): 80 pages, few images. Original: 12 MB. After ''Basic'' compression: 3.1 MB (74% reduction). All charts and text crisp.

Example 4 (photo album PDF): 30 pages, each page a full‑screen photo. Original: 120 MB. After ''Maximum'' compression: 18 MB (85% reduction). Some fine detail lost, but still suitable for sharing.

What if I need to shrink a PDF to a specific size (e.g., 5 MB or 10 MB)?

Our tool can target exact sizes. After upload, we show an estimate; if it's still too large, you can apply ''Maximum'' or use the ''custom target size'' slider (Pro feature). For free users, you can run the compression twice – the second pass often squeezes out more.

Frequently asked questions about shrinking PDFs

Check the FAQ below for answers to: ''Will shrinking a PDF ruin image quality?'', ''Can I shrink a PDF on a Chromebook?'', ''How do I shrink a PDF without losing text sharpness?'', and more.

Still stuck? Watch this quick tutorial

If you prefer video, here's a 1‑minute demonstration of all methods. (Embedded video placeholder – we'll add a YouTube link soon.)