Getting under 100 KB without wrecking the document
100 KB is one of the strictest limits you’ll meet: common on exam registration forms, scholarship applications and some government portals. For comparison, a single phone photo is usually 2–4 MB, and an ordinary office scan of one page is 300 KB to 1 MB. Getting under 100 KB means cutting 90% or more, and how you cut matters.
This tool searches for the best result that fits, in this order:
- Remove waste without losing anything: leftover editing data, duplicate images, uncompressed sections.
- Recompress images, keep text. Photos are resized and re-encoded in steps; scanned pages become sharp black-and-white. Real text in the PDF stays selectable.
- Convert only the heaviest pages to images, one at a time, until the file fits. Lighter pages keep their text.
Every attempt is measured for real. The first one under your limit is the one you get, so you receive the highest quality that fits, not an arbitrary preset.
What 100 KB looks like in practice
From our own tests:
| Starting file | Result under 100 KB |
|---|---|
| 5-page office scan, 15 MB | about 85–90 KB, black-and-white, clearly readable |
| 4-page brochure with large photos, 16 MB | about 65 KB, photos smaller, text still selectable |
| 13-page report with one huge image page | about 90 KB, only the image page converted |
| Fillable government form, 204 KB | not compressed further: form fields are never destroyed |
Getting the most out of a 100 KB limit
- Send fewer pages. If the portal only needs page 1, extract it first. A single page fits 100 KB far more easily than five.
- Start from a greyscale scan. Colour scans of black-and-white documents waste most of their size on paper tint.
- Crop photos before converting. If you’re making a PDF from a phone picture, crop away the table and background first, then use JPG to PDF.
- Try 200 KB if allowed. If the portal accepts more, the 200 KB tool will keep noticeably more detail.
Is it still readable?
After compressing, the first page is previewed right below the result. Zoom in on small print such as dates, registration numbers and signatures before you upload. Black-and-white conversion keeps strokes crisp, but very small, faint handwriting can lose detail at this size. If that happens, uploading fewer pages at a higher quality is the better fix.
Your document never leaves your device during any of this. There is no upload, no account, and no copy kept anywhere.
If the result is still too big
When the tool reports that 100 KB couldn’t be reached, the message tells you why. A fillable form keeps its fields; a long text document keeps its readability. In both cases the quickest fix is usually to upload fewer pages, or to ask whether the portal accepts a higher limit. Typing a slightly larger value, such as 150, into the Max size box shows how close you can get.
Frequently asked questions
Can every PDF be compressed to 100 KB?
Most one- to three-page scans, certificates and photos can. Long documents with lots of text and fonts sometimes can't without becoming unreadable; in that case we show the smallest readable result and explain why.
How is this different from the 200 KB tool?
It's the same engine with a stricter target. At 100 KB the tool is more likely to convert scanned pages to black-and-white and to lower image resolution, so it pays to check the preview before uploading.
Will the result be accepted by the portal?
The file is a standard PDF that any viewer or portal can open, and its size is measured on the finished file. Portals sometimes also check page count or dimensions, so read their instructions too.
My file is a photo, not a PDF. What do I do?
Turn it into a PDF with the JPG to PDF tool first, then compress it here. Or, if the portal accepts images, use Compress Image to shrink the photo directly.
Do you keep a copy of my document?
No. There is no server involved in processing. The file is handled in your browser's memory and disappears when you close the tab.