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Converts on your device — your PDF is never uploadedCompress a PDF to 100 KB
Shrink a PDF to under 100 KB — the target is already set, so just drop your file in and press Compress. The tool tries progressively stronger settings and keeps the best quality that fits. Text stays selectable, nothing is uploaded, and there is no watermark or sign-up.
What Fits in 100 KB
| Document | Reaching 100 KB | Recommended settings |
|---|---|---|
| 1–2 page scanned form | Comfortable | Smart mode, grayscale on |
| Passport or ID photo page | Comfortable | Smart mode, colour kept |
| 5–10 page scan | Possible, noticeably softer | Smart + grayscale, or Maximum |
| 20+ page colour document | Unlikely | Split into separate files |
The arithmetic is simply 100 KB divided by the page count. Two pages gives each page 50 KB, which is plenty for a legible grayscale scan. Twenty pages gives each 5 KB, which is not.
Getting There Without Wrecking It
- Turn on grayscale first. For scanned text this is nearly free — it removes colour data that was only ever carrying paper tint and scanner noise, often 20–40% of the file.
- Let Smart mode try before Maximum. Smart keeps text vector-sharp no matter how hard the images are compressed, so a scan of typed text can survive aggressive settings surprisingly well.
- Reduce pages if you can. If the form only needs the signature page, send only that page.
- Re-scan at a sensible resolution if you control the source. Scanning a text document at 600 DPI produces a file nobody needs; 200 DPI is ample for legibility.
Why 100 KB Specifically?
The number is a fossil. When these upload forms were designed, a scanned page from an office machine was 40–80 KB, so a 100 KB cap was generous — room for a page or two with margin to spare. Nothing about that assumption survived the smartphone. A photographed page today arrives at 3–6 MB, sixty times the budget, and the forms never moved.
Indian government portals, visa applications, examination boards and bank KYC systems are the most common places you will meet it, and they are rarely negotiable — the upload simply fails.
The Order That Actually Works
Most people reach straight for the quality slider, which is the setting that costs the most visible damage per kilobyte saved. There is a better sequence:
| Step | Typical saving | Visible cost |
|---|---|---|
| 1. Grayscale | 20–40% | None on text scans |
| 2. Lower resolution | 50–75% | Very little above 150 DPI |
| 3. Lower quality | 30–60% | The visible one |
| 4. Fewer pages | Proportional | None — if the form allows it |
Target mode applies these in roughly that order for you, which is why it usually lands on a better-looking file than manually dragging quality down to 30.
If Your Scanner Made the Problem
Compression repairs a file; scanning settings prevent the problem. If you still have access to the paper document, re-scanning at 200 DPI in grayscale will often produce something already close to 100 KB with far better clarity than squeezing a 600 DPI colour scan down to the same size. Detail that was never captured cannot be lost, but detail that was captured and then crushed looks worse than detail captured sensibly in the first place.
Frequently Asked Questions
How do I compress a PDF to 100 KB?
Drop your PDF in - the 100 KB target is already set. Press Compress and the tool works through progressively stronger settings until the file fits, keeping the best quality that does. Nothing is uploaded.
Is 100 KB realistic for my document?
It depends almost entirely on page count. A one or two page scan reaching 100 KB is routine. A twenty page colour document is a different matter - 5 KB per page leaves very little room, and the tool will tell you the smallest it managed rather than pretending.
What if it cannot reach 100 KB?
You will be told the smallest size achieved and at what quality. Three things to try, in order: switch on grayscale, switch to Maximum mode, or split the document into fewer pages.
Will the text still be readable at 100 KB?
In Smart mode the text is never touched - it stays vector-sharp regardless of how hard the images are squeezed. What degrades is the scanned or photographic imagery. For a scan of a typed page, readability usually survives well because grayscale plus moderate quality is enough.
Why do so many forms ask for 100 KB?
The limits were set when documents were small office scans, and they were never revised. A phone photo of the same page today is fifty times larger, which is why this specific number causes so much trouble.
Does it work on a phone?
Yes. The whole process runs in the browser on iOS and Android, which is convenient because the oversized photo is usually already on the phone.
Is my document uploaded?
No. Everything is parsed and rebuilt on your device. For passport scans, certificates and bank statements - the documents these limits usually apply to - that matters.
Is it free?
Completely free: no sign-up, no email, no watermark and no daily cap.