Shrink your PDF to exactly 100KB
Open Compress PDF →Why your PDF is so big in the first place
A PDF made by typing in Word and saving is tiny, often 30–80KB for several pages. The big ones are almost always scans or phone photos. A modern phone camera captures 12 megapixels or more, and every one of those pixels is saved, including the table under your certificate, the shadow of your hand and the grain of the paper.
So a “100KB limit” is not really about the document. It is about throwing away the parts of the picture nobody needs, while keeping the parts somebody has to read.
Step 1: Keep only the pages the form asks for
This is the single biggest saving and costs nothing in quality. If the form wants your Class 12 marksheet, it does not want the envelope scan, the blank back side or your Class 10 marksheet too. Every page you remove is size you can spend on the pages that stay.
Use Split PDF to pick out just the pages you need, or Rotate & Organize PDF to delete blank pages and fix sideways ones.
Step 2: Crop away the table
If the PDF came from phone photos, look at the edges. A border of wooden table or bedsheet around each page is pure waste. Crop each photo to the edge of the paper with Crop Image and rebuild the PDF with JPG to PDF. You will often save 20–30% before compressing at all.
Step 3: Decide whether colour matters
Colour photos store three channels of information; greyscale stores one. For a marksheet, a caste certificate or an Aadhaar card, black and white is perfectly readable and much smaller. Keep colour only when it carries meaning, such as a coloured stamp the officer needs to see or a photo ID where your face must be clear.
Step 4: Compress to the exact number
This is where most people get stuck. Typical compressors offer “low, medium, high” and you discover the result only after downloading. FileFitly’s Compress PDF lets you type the number instead. It measures the actual file at each quality level and keeps the sharpest version that is just under your limit.
- Open Compress PDF and add your file.
- Choose 100KB, or Custom for any other number.
- Tick Black & white if colour does not matter.
- Press Fit, check the preview, and download.
What 100KB can realistically hold
| Scanned A4 pages | Result at 100KB |
|---|---|
| 1 | Sharp, even small print readable |
| 2–3 | Clear for normal text |
| 4–6 | Readable; small print gets soft |
| 7+ | Rough. Remove pages or ask for a higher limit. |
Mistakes that make it worse
- Compressing a compressed file. Each round of compression adds blur. Always start from the original scan.
- Taking a screenshot of the PDF. It lowers resolution unpredictably and often adds your phone’s status bar.
- Shrinking with “print to PDF” at low quality. You lose control over the result and still might not hit the number.
- Aiming exactly at 100KB. Some portals count 1KB as 1,000 bytes and others as 1,024. Land a little under, as FileFitly does automatically.
When the PDF will not go under 100KB
If you have removed pages, gone black and white and it still will not fit with readable text, you have three honest options:
- Check the form again. Many allow 200KB or 300KB for some documents and 100KB only for others.
- See whether the form lets you upload more than one file for that item, and split the document.
- Rescan the original at a lower resolution. Scanners set to 150 DPI give smaller files than 300 or 600 DPI and are still perfectly readable on screen.
Before you upload
Open the final file on your phone and zoom in on your name, roll number and any figures. If you can read them comfortably, the person checking your application can too. Keep the original file safe; you may need a clearer copy at document verification.
Shrink your PDF to exactly 100KB
Open Compress PDF →