Drop your PDF
One file or several. Password-protected PDFs need unlocking first.
Compress PDF to 100 KB
Get a PDF under 100 KB without guessing: the limit is already set, so you just drop the file. Images are shrunk first and the text stays sharp when possible. Nothing is uploaded.
- Free
- No sign-up
- Runs in your browser
Common limits
First the images inside are shrunk and the text is kept. Only if that is not enough are pages turned into images.
100% private — your PDFs are processed on your device and are never uploaded to any server.
Works with PDFs up to about 300 MB each. Password-protected PDFs cannot be processed.
Next step
Keep going with your result in another tool. Nothing is uploaded.
How it works
The limit is already set
The maximum size is 100 KB; you can change it or keep the pages readable.
Download the smaller PDF
The PDF is reduced on your device and you download it at 100 KB or less.
How to compress a PDF to 100 KB
To compress a PDF to 100 KB, drop it on the box above: the limit is already set to 100 KB. The tool shrinks the images inside the PDF first and keeps the text selectable; only if that is not enough does it convert pages to images. Everything happens in your browser, so the PDF is never uploaded.
What 100 KB holds in a PDF
100 KB is 100,000 bytes. As a rough guide, that is one or two lightly scanned pages at a reading-quality resolution, though a PDF made from text (not scans) takes far less room per page and a PDF full of photos takes more.
Where a 100 KB PDF limit is common
A limit of about 100 KB is typical for very strict form uploads and single-page certificates. Uploads over the limit are rejected outright, so the aim is to land at or under the number, not to shrink as far as possible.
How the PDF gets under 100 KB
Most of a PDF's weight is usually its images, especially scans and photos. The tool recompresses those images at a lower quality and resolution, keeps the text as real, selectable text, and checks the result against your limit. If the document still does not fit and you allow it, it turns pages into images as a last resort, which always fits but makes text no longer selectable.
How many pages fit in 100 KB (estimate)
| Scan setup (A4 page) | Approx. weight per page | Pages that fit |
|---|---|---|
| 150 DPI, grayscale | 70 KB | 1 |
| 150 DPI, color | 150 KB | less than one |
| 200 DPI, grayscale | 120 KB | less than one |
| 300 DPI, grayscale | 250 KB | less than one |
| 300 DPI, color | 600 KB | less than one |
How much has to go
| Typical document | Reduction needed |
|---|---|
| 10-page scan, 150 DPI grayscale (about 700 KB) | 86% |
| 10-page scan, 150 DPI colour (about 1.5 MB) | 93% |
| 10-page scan, 300 DPI colour (about 6 MB) | 98% |
| Phone-photographed 5-page document (about 15 MB) | 99% |
When you need a 100 KB PDF
A 100 KB limit for a PDF is very strict and usually applies to single-page certificates, declarations and signed forms on portals that were designed for tiny uploads. At this size only a lightly scanned page or a text-based PDF fits.
What to give up first at 100 KB
To fit 100 KB the scan quality has to drop: grayscale or even black and white, around 150 DPI, one page at a time. Colour photographs inside the document are the first to go, since they weigh far more than the text around them.
Tips to fit under 100 KB
- Scan in black and white or grayscale at 150 DPI; colour scans are several times heavier for the same page.
- If your document has several pages, send only the ones the portal asks for and split the rest.
- Export documents from a text editor as PDF instead of scanning a printout: a typed page is often under 50 KB.
- Keep the option to convert pages to images off if the text must stay selectable or searchable.
Private by design
The PDF is processed in your browser. Contracts, IDs, invoices and medical documents are never uploaded to a server, which is why there is no queue and no file size imposed by an upload.
Frequently asked questions
How do I compress a PDF to 100 KB?
Drop the PDF on the tool at the top of this page. The limit is already set to 100 KB; the tool reduces the file until it fits and lets you download it.
Can a scanned page fit in 100 KB?
Yes, one or two pages at low resolution in grayscale. Colour or high-resolution scans need a bigger limit.
How do I make a one-page certificate 100 KB?
Drop it in the tool above with the limit at 100 KB. If it is a scan, the tool shrinks its image; if it is text, it may already be small.
Will my PDF be exactly 100 KB?
It will be 100 KB or less. The tool stops as soon as the file fits, so the result is often just under the limit rather than exactly on it.
Will the text stay selectable?
Yes when the images alone can be shrunk enough. If that is not enough and you allow converting pages to images, those pages lose selectable text; you can switch that option off.
Why won't my PDF get under 100 KB?
PDFs with many high-resolution photos, or many pages, may need a stronger reduction. Try removing pages, splitting the file or allowing the last-resort option.
Is it free and private?
Yes. No sign-up, no watermark, and the PDF never leaves your device because it is processed in your browser.
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