How to Compress a PDF Under 200 KB

4 min read

Compressing a PDF under 200 KB means reducing its file size until it passes an upload limit. Job portals, university applications, visa forms, and government sites often cap each document somewhere between 100 KB and 500 KB. A scanned ID card or certificate from a phone is usually far larger than that. This guide shows how to get it under the limit in your browser, with nothing to install.

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Why are scanned PDFs so large?

A scanned PDF holds images, not text. Every page is a photo. A modern phone camera shoots at 12 megapixels or more, so a single page can weigh 2 to 5 MB, and scanner apps often save those images with light compression.

An upload portal doesn't need that resolution. An A4 page stays readable on screen at a fraction of it. Compression removes that difference.

Before you start: check the portal's limit

Each portal sets its own rules, and they can change from one intake to the next. Read the upload instructions and note three things:

  1. The maximum size per file, such as 200 KB or 500 KB.
  2. The accepted formats: PDF only, or JPG as well.
  3. The page rules: whether several documents must go into one file.

Aim a little below the limit, such as 180 KB for a 200 KB cap. Some systems count 1 KB as 1,000 bytes and others as 1,024, so a small margin prevents a rejected upload.

Step 1: Compress the PDF

Open the Compress PDF tool. It processes the file in your browser and uploads nothing, so a passport scan or ID card stays on your device.

  1. Click the upload area or drag the PDF onto it.
  2. Choose a compression level:
    • Low Compression: best quality, moderate size reduction.
    • Medium: balanced quality and size. Start here.
    • High Compression: smallest file, lower quality.
  3. Click Compress PDF and wait for every page to finish.

The tool re-renders each page as an optimized JPEG image and rebuilds the PDF. This works well on scans. The trade-off: text in the compressed PDF can no longer be selected or searched. For scanned application documents, that rarely matters.

Step 2: Check the result

When it finishes, the tool shows the original size, the compressed size, and the percentage saved. Compare the compressed size with the portal's limit.

  • Under the limit? Download the file, open it, and check that the important details are still readable: ID numbers, names, and dates.
  • Still too big? Run it again at High Compression.
  • The file grew? This can happen with text-only PDFs exported from Word. Those files are usually small already, so check whether the original passes the limit.

Step 3: When it's still too large

High compression on a multi-page document is sometimes not enough. There are three more options.

Remove pages you don't need

Portals often want specific pages, such as the front of a certificate without the back. Open Merge PDF, choose the Split tab, and type the range you need, such as 1-2. Fewer pages means a smaller file. Compress the result again if needed.

If the portal wants several documents in one file, use the Merge tab after you compress each document.

Shrink the images before they become a PDF

If you photographed the document, prepare the photos before turning them into a PDF. This gives you the most control over the final size.

  1. Reduce the photo dimensions with the Image Resizer. A width of about 1,200 pixels keeps an A4 page readable on screen.
  2. Compress the photos with the Image Compressor at Medium or High.
  3. Combine them into a PDF with Image to PDF. Choose A4 pages and Low (smaller file) image quality.

Turn an existing PDF into images first

If all you have is a large PDF, convert its pages to JPG with PDF to Image at 1× resolution. Then follow the image compression and image-to-PDF steps above.

Tips for scans that stay readable after compression

  • Even lighting. Photograph the document near a window or under a bright lamp, with no shadow from your hand or phone. Shadows and noise make the file bigger and the text blurrier.
  • A plain background. Place the page on a dark, plain surface so the edges are clear, then crop everything outside the paper.
  • Black and white for text documents. A black-and-white or grayscale scan mode produces a much smaller file than color.
  • One document per file. Don't combine documents the portal asks for separately.
  • Check at full size. Zoom to 100% and make sure every number is readable before you upload.

Summary

  1. Check the size limit and format rules on the portal.
  2. Compress with the Compress PDF tool at Medium, then High if needed.
  3. Check the size and readability of the result.
  4. If it's still too large, drop pages you don't need or shrink the photos before building the PDF.

Every step runs in your browser, so your personal documents never reach a server.

Try Compress PDF →