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Compress PDF to 100 KB

Give it the number the form asked for. The result lands under 100 KB, and your document never leaves this device.

  • 0 uploads
  • No limits
  • No signup
  • Works offline

Where the 100 KB limit comes from

The tightest cap in common use. It turns up on older application portals, on some scholarship and grant systems, and on government forms whose upload limits were set when a 100 KB attachment was generous.

What 100 KB actually means for a PDF

One hundred kilobytes for a PDF is a different order of problem from 100 KB for an image, because a PDF carries structure a picture does not: a cross-reference table, page objects, an embedded font or two, and whatever the producing application left behind. On a short document that overhead can be most of the file before a single scanned page is counted.

That is why the lossless pass matters more at this budget than at any other. Subsetting the fonts and dropping the metadata, the thumbnail cache and the unreachable objects can take a two-page text PDF under 100 KB with nothing re-encoded at all. If it does, stop there — you have hit the number without touching a pixel.

What is realistic at 100 KB

A one or two page scan reaches 100 KB comfortably at 96 dpi. A twenty-page document will not — not here, not anywhere. At that length the tool will report the smallest it could reach, and the honest answer is to split the document and upload the parts separately.

If the portal accepts several files, splitting is almost always better than crushing one file until the print is unreadable.

The order that works

  1. Try Lossless-lite first. If it gets you under the limit, you keep selectable text and lose nothing. It takes seconds.
  2. If not, switch to Balanced at 144 dpi. This is where the real compression happens, and where the text becomes an image.
  3. Only drop to 96 dpi if you must. Small print and stamps start to blur below 144, and a document nobody can read is not a document that passed.
  4. If it still will not fit, split it. Most portals that cap a file at 100 KB accept more than one file.

Before you upload it anywhere

Open the compressed file and read it. Check the small print, the signature and any stamp — those are the first things to go when compression gets aggressive, and they are usually the parts the other side cares about. A rejected application costs far more than another minute of checking.

How it works

  1. 01Add your PDFDrop it here, click to choose, or paste it from the clipboard.
  2. 02The budget is already set to 100 KBChange it if the form you are filling in says something different.
  3. 03CompressEach pass re-renders the document and measures the result, until it fits.
  4. 04DownloadThe file lands under your limit. Nothing was uploaded to get there.

Questions people actually ask

Why can a two-page PDF be 900 KB when the text is only a few kilobytes?
Because the text is rarely the expensive part. A full embedded font family carries every glyph it defines, including alphabets your document never uses, and can run to several hundred kilobytes on its own. Add an editor's revision history and an embedded thumbnail for each page and the document is mostly things nobody reads.
Can any PDF be compressed to 100 KB?
A one or two page scan reaches 100 KB comfortably at 96 dpi. A twenty-page document will not — not here, not anywhere. At that length the tool will report the smallest it could reach, and the honest answer is to split the document and upload the parts separately.
Will the text still be selectable?
Only in Lossless-lite mode. Balanced mode — the one that reaches small targets — renders each page as an image, so the text becomes a picture of text: not selectable, not searchable, invisible to a screen reader. The result screen says which mode produced your file.
What if it cannot reach the target?
The tool tries progressively lower quality and then lower resolution, and if the smallest setting still overshoots it tells you so and gives you that smallest version rather than pretending. If the portal accepts several files, splitting is almost always better than crushing one file until the print is unreadable.
Does it ever go over the limit?
No. The search only accepts a result at or under 100 KB, so what you download is safe to upload. Landing slightly under is normal; landing over would defeat the purpose.
Is the file uploaded to a server?
No. Every page is rendered and re-encoded by your own browser. Nothing leaves the device, which matters when the document is an ID, a payslip or a medical record.

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