100 KB target
Reduce a PDF to 100 KB
For portals that literally reject anything over 100 KB. Drop a lean PDF, keep the target on, preview the pages, then download if you’re under.
Drop your PDF here
Click anywhere or drop files, tweak options, then press Reduce
Quick presets
One tap for common upload caps—then press Reduce.
Auto-reduce after add
Off by default—you stay in control
Aim for a max file size
Chase a KB target instead of a quality slider
Scanned or photo-heavy PDFs shrink the most. Text-only PDFs are often already compact—if we can’t go smaller, we’ll keep your original instead of making a bigger file.
How it works
- 01
Start with one lean page
Drop a single-page PDF when possible. Extra pages burn the entire 100 KB budget.
- 02
Leave the 100 KB target on
It’s pre-filled in Options. Press Reduce and watch the size in the list.
- 03
Preview, then download
Open Preview to check text and stamps. Download only when the size and clarity both pass.
What 100 KB really buys you
A hundred kilobytes is closer to a fax-era attachment than to a modern phone scan. It can hold a short letter, a clean ID page, or a simple form— not a thick packet of photographed paperwork. Treat this preset as an extreme mode, not a default for every document.
If your upload is already a multi-page gallery of phone photos, trim to the pages the form actually requires before you press Reduce. Compression cannot invent space that the page count already spent.
Files that have a fighting chance
- Single-page scans with even lighting and little background clutter
- Text letters exported from a word processor (sometimes already under)
- Forms with one or two small logos instead of full-bleed photos
Color magazine-style pages and dense photo résumés usually need 200 KB or 500 KB instead.
A workflow that protects readability
- Drop the file and leave Aim for a max file size set to 100.
- Press Reduce and read the new size in the list.
- Open Preview—zoom small text, stamps, and signatures.
- Download only if both size and clarity are acceptable.
If Preview looks mushy while you’re still over the limit, stop chasing 100 KB. Ask whether the portal accepts a higher cap, or split the submission into separate uploads when the instructions allow it.
When we refuse to make the file larger
Clean digital PDFs can already be near 100 KB. Extra processing may rasterize pages and inflate the download. In that case you’ll see “Kept original”—use that file as-is, or move to the unrestricted PDF size reducer if you only need a modest trim for email.
Related tools
Common questions
Can a multi-page scan fit in 100 KB?
Usually not while staying readable. One clean page—or a short letter with light graphics—has a realistic chance. Longer photo packets should drop pages first or use a higher cap.
Why did the tool keep my original?
Text-heavy digital PDFs are often already compact. Extra compression can make them larger. When that would happen, we keep the original and mark it so you don’t download a worse file.
Should I flatten or re-scan before trying 100 KB?
If you control the source, a single-page scan at moderate resolution beats compressing a 12-megapixel photo of a document. Fewer pixels in means fewer bytes out.
How do I confirm I’m under 100 KB?
After Reduce, the list shows the new size. Open Preview to check readability, then download only if the number is under your portal’s rule.
What if I’m still over after one pass?
Remove pages, crop margins in the source if you can, then re-run. If the site allows more room, switch to the 200 KB preset instead of destroying legibility.