Compress PDF to 100 KB, 200 KB or 1 MB

By the MuftTools teamUpdated October 2026How we check

Make a PDF small enough for the portal

Recruitment forms, college admissions, scholarship portals, passport and visa appointments, insurance claims and HR systems often set a maximum size for each PDF you upload. The limit is usually given in KB or MB: 100 KB for a certificate, 200 KB for a caste or income certificate, 500 KB or 1 MB for a full marksheet set. A scan straight from a phone or printer is often many times larger, and the portal simply refuses it.

This tool brings your PDF under the exact size you choose. It works in your browser: the file is not sent to any server, there is no sign-up, no daily limit and no watermark, and it keeps working even if your connection drops after the page has loaded.

How to compress a PDF to a set size

1. Choose the PDF. Tap the box or drop the file on it. If it has a password, type it when asked.
2. Pick the target. Tap 100 KB, 200 KB, 500 KB or 1 MB, or choose Custom and type the limit from the portal's instructions.
3. Pick the method. Auto suits almost everyone. Keep text selectable never turns pages into pictures. Pages as images gives the smallest files for scanned documents.
4. Press Compress. The tool tries settings until the file fits, then shows the size before and after.
5. Check the preview. Zoom in on small print, signatures and photos, and use Next to look at every page.
6. Download. The file is saved as yourfile-compressed.pdf. Upload that one to the portal.

How the compression works

A PDF is made of text, fonts, drawings and pictures. In a scanned document each page is one big picture, and pictures are almost always what makes a PDF heavy. The tool works in three stages and stops as soon as the file fits:

1. Clean-up without any loss. Unused leftovers from editing apps, old page thumbnails and duplicate structure are removed, and the file is packed more tightly. Nothing you can see changes.
2. Smaller pictures, same text. Each picture inside the PDF is resized and saved again as a JPEG. The tool searches for the gentlest setting that meets your target, then fine-tunes the quality so the file lands close under the limit instead of far below it. Typed text, fonts and lines are not touched, so they stay sharp and you can still select and search the text.
3. Pages as images. If the first two stages are not enough, Auto turns every page into an image at the highest resolution that fits, from 150 DPI down to 50 DPI. This can reach much smaller sizes, but the text can no longer be selected or copied. The result box says clearly when this has happened.

If none of this reaches your target, the tool tells you the smallest size it managed and lets you download that version, rather than giving you an unreadable file and calling it a success.

Why some PDFs barely shrink

A PDF made from a Word file or exported from accounting software is mostly text and fonts. Those parts are already compact, and squeezing them further would mean turning the text into pictures. That is why a 40-page typed report might go from 120 KB to only 60 KB while keeping its text, while a 4 MB scan of a marksheet can come down to 150 KB.

Embedded fonts also take room. A document that uses several fonts, especially Hindi or other Indian-language fonts, carries each font inside the file. The analysis line under the file name shows how much of your PDF is pictures, which tells you roughly how far it can go.

Tips for tight limits like 100 KB

• Turn on Black and white for scans of printed pages. Text stays readable and the file gets much smaller.
• Upload only the pages the portal asks for. If it wants page 1 of a certificate, remove the rest first with the PDF editor, then compress.
• Scan at 150 to 200 DPI. Phone scanner apps often save at very high resolution. A lower setting gives a smaller starting file and a sharper result.
• Crop the edges. Dark table edges and shadows around a phone photo add size without adding anything useful.
• Do not zip the PDF. Portals that ask for a PDF will not accept a ZIP, and zipping hardly reduces a PDF anyway.
• Check the minimum too. A few forms also set a minimum size. If yours does, choose a target just under the maximum rather than the smallest option.

Common mistakes

The most common one is uploading a file that looks fine on a phone screen but is unreadable when printed or zoomed. Always zoom into the preview, especially roll numbers, dates, signatures and stamps. If they are blurred, choose a larger target or switch on Black and white instead of going lower.

The second is converting a PDF to images and back by hand, which usually makes the file bigger and loses the text. Compress the PDF directly instead. If the portal wants a JPG instead of a PDF, use the PDF to JPG converter and then the image compressor. To put several photos into one PDF first, use JPG to PDF.

Your file stays private

Everything happens inside your browser tab. The PDF is read from your device, compressed in memory and saved back to your device. It is never uploaded, so the tool is safe for marksheets, salary slips, bank statements and identity documents. Close the tab and nothing is left behind except the file you downloaded.

Compress to a set size

• Compress PDF to 100 KB
• Compress PDF to 200 KB
• Compress PDF to 1 MB