What does Compress PDF do?

It reduces PDF file size by re-rendering pages at a controlled resolution and JPEG quality. You choose a preset or set a target file size, and the tool optimizes accordingly.

Is my PDF uploaded to a server?

No. Compression runs entirely in your browser. Your file never leaves your device.

What’s the difference between the compression presets?

Light (200 DPI) is best for printing, with 30–40% size reduction. Balanced (150 DPI) cuts 50–60%. Maximum (100 DPI) hits 70–80% for screen viewing. Extreme (72 DPI) pushes 85–95% when file size is the priority.

What is target-size mode?

You set the maximum file size you need (in MB). The tool samples pages at various quality levels and picks the best settings to hit your target.

Will compression make my PDF look worse?

It depends on the preset. Light and Balanced produce results that look nearly identical to the original at normal zoom. Maximum and Extreme show visible quality loss but are acceptable for on-screen reading.

Can I convert to grayscale while compressing?

Yes. The grayscale option removes color information, which further reduces file size by about 40% on top of the compression.

Does it work with password-protected PDFs?

Yes. Enter the password to decrypt, then compress. Everything runs locally.

Can I compress PDFs on my phone?

Yes. Works in any modern mobile browser with the same controls as desktop.

บีบอัด PDF

ลดขนาดไฟล์พร้อมปรับแต่งคุณภาพให้เหมาะสม

1. Select PDF

Select a PDF file from your device. All processing happens locally in your browser.

2. Choose quality

Select compression level: Light for quality, Balanced for best results, or Maximum for smallest size.

3. Download

Get your compressed PDF instantly. See exactly how much space you saved.

About Compress PDF

How PDF Compression Works

The tool renders each page as an image at a controlled resolution and quality level, then rebuilds the PDF from those optimized images. Lower DPI and JPEG quality mean smaller files. Higher settings preserve more detail. You choose the balance.

OxygenPDF offers four presets — Light, Balanced, Maximum, and Extreme — plus a target-size mode where you set the exact file size you need and the tool figures out the right settings automatically.

Why Compress a PDF

File size caps are everywhere. Email attachment limits, upload forms, cloud storage quotas. Compression gets you under the line.

Email Attachments

Most email providers cap attachments at 25 MB. A 40 MB report won’t send. Compress it to fit.

Web Uploads

Job applications, government forms, and insurance portals often limit uploads to 5–10 MB. Compression gets large scans under the limit.

Faster Sharing

Smaller files transfer faster over slow connections, load quicker in browsers, and take up less space on shared drives.

Storage Savings

Archiving hundreds of scanned PDFs? Even moderate compression cuts storage needs in half.

Four Presets and a Target-Size Mode

Light compression (200 DPI, 85% quality) typically reduces file size by 30–40%. Good for printing. Balanced (150 DPI, 75% quality) hits 50–60% reduction — the sweet spot for most uses. Maximum (100 DPI, 60% quality) pushes 70–80% reduction for screen-only viewing. Extreme (72 DPI, 35% quality) gets 85–95% reduction when every kilobyte counts.

Target-size mode flips the process. Enter the maximum file size in MB, and the tool samples representative pages to find the best compression level that fits. It runs a binary search across quality settings so you get the highest quality that meets your constraint.

How It Compares

Compression is a standard feature, but the controls and privacy model differ.

ฟีเจอร์	Adobe Acrobat	iLovePDF
Multiple compression presets
Target-size mode
Grayscale conversion
Custom DPI and quality sliders
Real-time size estimate
No file upload required	Desktop only
Free to use		Limited

Your PDF Stays on Your Device

Online compressors upload your file, process it on their servers, and send back the result. Your document passes through infrastructure you don’t control. For personal documents, financial records, or anything under NDA, that’s a risk.

OxygenPDF compresses in your browser. The file never leaves your machine. Close the tab and the data is gone.