Compress PDF to 100 KB
Portal demands a PDF under 100 KB? This tool compresses yours to fit — strongest compression that stays legible, processed entirely on your device.
Free, no signup, no watermark. If a target can’t be reached, we tell you exactly why and what to change.
How it works
Drop your PDF
The file opens directly in your browser — never uploaded, which matters for the contracts, IDs, and records people compress.
We compress to 100 KB
Pages are re-rendered as optimized images and rebuilt into a PDF that fits your limit — the strongest compression that stays legible.
Check & download
Exact final size shown. If your target isn’t realistic for the page count, we say so instead of producing a smudge.
Who needs a 100 KB PDF?
The 100 KB PDF cap is the standard “single document” limit across application systems:
- Visa and immigration portals — each supporting document in its own capped field.
- University admissions — certificates, score cards, ID pages.
- Recruitment portals — proofs and declarations attached per-file.
Budget reality: 100 KB holds one to two scanned pages at clearly readable quality, three at a stretch. Starting from images instead of a PDF? Skip a step — the JPG to PDF under 100KB tool converts and hits the limit in one pass.
How this works — the honest trade-off
This tool achieves its dramatic size reductions by re-rendering each page as an optimized image and rebuilding the PDF. For scanned documents — the files that actually hit portal limits — this is exactly right: scans are images already, and re-encoding them efficiently is pure win.
The trade-off you should know before downloading: rebuilt pages are images, so text is no longer selectable or searchable, exactly like a scan. If you need a digitally-native contract to keep live text, use your PDF software’s “reduce file size” function instead. If you need a scanned certificate under a portal limit — you’re in the right place.
And the privacy angle, since these files are often sensitive: the entire render-and-rebuild happens in your browser. The document never travels to us or anyone else.
Making a tight target work
Tight PDF budgets reward preparation. Three changes that often make the difference between “couldn’t reach target” and a clean pass:
- Crop before compressing. Scanner output includes margins and bed shadow — pure waste at this budget. A tight crop can halve the starting size before compression even begins.
- Split multi-page documents. Most portals with tight caps accept one file per page. Two single-page PDFs at this target look far better than two pages crammed into one.
- Start from the best source. Compressing an already-compressed PDF stacks losses; if you have the original scan images, the JPG-to-PDF tool builds a cleaner small PDF directly.
The tool enforces a legibility floor — about 4 KB per page — and refuses to produce files below it, telling you the realistic minimum instead.
Private by architecture, not by promise
Your files are processed entirely on your own device — they are never uploaded to us or anyone else. We couldn’t see them if we wanted to. This website is served from servers in the United States (North Carolina).
Processed on your device
The compression engine is JavaScript running in your browser. There is no upload step in the code — nothing to trust, just how it works.
No signup, no watermark
Every tool is free and works instantly. No account, no email required, no marks on your files.
Honest results
If your target size can’t be reached at acceptable quality, we say so and tell you exactly what to change — not silently degrade your file.
Frequently asked questions
How many pages fit in a 100KB PDF?
One to two scanned pages at clearly readable quality. Three is possible with clean, high-contrast source pages. Beyond that, split the document into separate files — the tool tells you honestly, with the smallest achievable size, whenever your page count can’t make the target.
Should I compress the PDF or rebuild it from images?
If you already have a PDF, compress it here. If you’re starting from photos or scans as images, the JPG-to-PDF-under-100KB tool produces better quality — it optimizes the images before they ever become a PDF.
Will the text stay selectable after compression?
No — pages are re-rendered as images to achieve the size reduction (see the explanation above). Scanned documents are unaffected in practice; they were images to begin with.
Is my PDF uploaded during compression?
No. Reading, rendering, and rebuilding all run in your browser. Sensitive documents never leave your device.
My PDF is password-protected. Can you compress it?
Not while it’s encrypted. Open it with the password and re-save (or print to PDF) to produce an unprotected copy, then compress that.
How long does PDF compression take?
A few seconds per page on a typical device — each page is rendered and re-encoded locally. A 10-page scan usually finishes well under a minute, with progress shown throughout.