How to Compress a PDF to Under 1 MB, 500 KB, 200 KB or 100 KB

The quickest way to get a PDF under a specific size is to tell the compressor the size you need. In PDF Perfect's Compress tool, switch on Target File Size, type the limit in MB (1 for 1 MB, 0.5 for 500 KB, 0.2 for 200 KB, 0.1 for 100 KB) and compress. The tool tries each quality level from High Quality downwards and keeps the first result that fits, all inside your browser.

Why Upload Forms Set Size Limits

Online application forms, university and government portals, and email services all cap attachment sizes to keep their systems fast. The exact limit varies by site and changes over time, so always check the number shown next to the upload button. Common caps are 1 MB, 2 MB or 5 MB per file, and some forms go as low as a few hundred KB.

Email limits are usually much higher. Our guide to getting a PDF under an email size limit covers Gmail, Outlook, Yahoo and iCloud.

Step by Step: Compress a PDF to a Target Size

1. Open the Compress tool and switch on Target File Size.
2. Type the limit in MB. Use a little headroom: for a 1 MB limit, enter 0.95.
3. Drag your PDF onto the drop zone. Compression starts straight away.
4. Check the before and after sizes on screen, then download the file.

What Target Size Actually Does

PDF Perfect compresses by redrawing each page as an image and saving it at a lower resolution and JPEG quality. With a target set, it starts at High Quality and steps down through Balanced, Maximum and two stronger settings until the file fits. You get the best-looking version that meets your limit. If even the strongest setting can't reach it, you get the smallest version it could make, and the sizes on screen show how far off it is.

Because pages become images, text in the compressed copy can't be selected or searched. That's fine for uploading a signed form or a scan, but keep your original file too.

When a PDF Won't Go Small Enough

• Remove pages you don't need first. Extract only the pages the form asks for, then compress that smaller file.
• Split long documents. If a portal accepts several files, split the PDF by size so each part is under the limit.
• Rescan at a lower resolution. Scanning at 150 to 200 DPI instead of 600 DPI makes a much smaller starting file, and grayscale is smaller than colour.
• Check for huge photos. A single high-resolution photo can outweigh every other page combined; resize it before putting it in the PDF.

Is It Safe to Compress an ID or Application Form Online?

The documents that meet strict size limits are often the sensitive ones: passports, ID cards, transcripts and bank statements. Many online compressors upload them to a server. PDF Perfect doesn't: compression runs on your device, and you can confirm it with the offline or Network-tab test on our How It Works page.