Compress PDF
Reduce PDF file size
Drop your PDF to compress
Drag & drop or browse a file
PDF only · Max 100 MB · Compressed in your browser — never uploaded
Reading PDF…
Choose Compression Level
Compressing your PDF
Processing pages…
0%
PDF Compressed!
Original Size
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→
Compressed Size
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–% smaller
⚡ 3 Simple Steps
How to Compress a PDF File
1
Upload PDF
Select your PDF file. Works with all types of PDFs up to 100 MB.
2
Choose Level
Pick High Compression, Recommended, or Less Compression.
3
Download
Click Compress and download your smaller PDF file instantly.
Compress PDF Online — Free PDF Size Reducer
Our free PDF compressor reduces the file size of your PDF documents quickly and easily. Upload your PDF, choose your compression level, and download a smaller version — all processed directly in your browser. Your files are never uploaded to any server.
Ideal for compressing PDFs before emailing, uploading to websites, or sharing on messaging apps where file size limits apply.
Why Use This Compressor?
- Three compression levels: High, Recommended, Low
- Shows before & after file size with savings %
- Browser-based — no server upload needed
- No watermarks on compressed output
- Works on all devices including iPhone and Android
- Free with no signup or account required
When to Compress PDF
- PDF too large to email (Gmail, Outlook limits)
- Uploading to job portals or HR systems
- Sharing on WhatsApp, Telegram (file size limits)
- Reducing PDF size for website upload
- Optimizing scanned PDF documents
- Making PDFs faster to load online
Compress PDF — Frequently Asked Questions
Common questions about reducing PDF file size
Results vary by PDF content and chosen compression level. PDFs with many images typically compress by 40-80%. Text-heavy PDFs may compress by 20-40%.
The "Less Compression" option preserves most quality. "Recommended" provides a good balance. "High Compression" produces the smallest file with slightly reduced visual quality.
100% safe. Compression happens entirely in your browser using JavaScript. Your PDF file is never sent to any server or seen by anyone.
No. Password-protected PDFs cannot be processed. Remove the password first using a PDF unlock tool, then compress.
Our tool re-renders each page using PDF.js and re-encodes images at a selected quality level. This significantly reduces image data, which is the main contributor to PDF file size.
Files up to 100 MB are supported. For very large PDFs (50+ MB), compression may take a minute or two depending on page count.
For "Recommended" and "Less Compression" levels, the visual difference is minimal. "High Compression" may slightly reduce sharpness of images within the PDF.
Currently one PDF at a time. After downloading, click "Compress another PDF" to process the next file.