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Compress a PDF to 100 KB, free, without uploading it

Application, exam and scholarship portals often accept documents of 100 KB at most. Drop the PDF and the target is already set to 100 KB: the pictures in it are made smaller step by step until the file fits, and the result says exactly how it got there. Text stays text. Nothing is uploaded, which matters for ID documents.

PDF · any size

✓ no upload✓ target 100 KB✓ no watermark✓ works offline

Compress to a size:50 KB100 KB200 KB500 KB1 MB

How a PDF gets under 100 KB

  1. Drop the file. The PDF opens in a worker in your tab, with the target already at 100 KB. Change it in the options if your form asks for another number.
  2. Compress. The pictures in the file are shrunk and re-encoded, first gently, then further, until the whole file is under the target. The gentlest setting that fits is the one you get.
  3. Check and download. The result shows the size before and after and the setting it took. Open it to check it is still readable, then upload it.

What it does

  • Counts 100 KB as 100,000 bytes, the stricter way, so the file passes a portal whichever way it counts.
  • Keeps text as real text and drawings as drawings; only pictures change.
  • Picks the gentlest setting that reaches the target, so the file is as readable as the limit allows.
  • Works best for certificates, mark sheets, ID proofs, one to three scanned pages.

What it does not do

  • It cannot make every file smaller than 100 KB: a file whose size is text, fonts or many pages may stay above it, and the result says how close it got.
  • It does not turn pages into pictures or remove pages; split the file or delete pages if it is still too big.
  • It does not shrink 1-bit black and white scans; they are usually small already.

Questions

What if my file cannot get under 100 KB?

The result says so and gives you the smallest file it could make. Remove pages you do not need with Delete pages, split the file, or scan at a lower resolution, then try again.

Will it still be readable?

Text stays sharp because it is not touched. Pictures and scans get softer the smaller the target; the tool stops at the gentlest setting that fits. Open the result before you upload it.

Is 100 KB counted as 100,000 or 102,400 bytes?

The tool aims for 100,000 bytes, the smaller of the two, so the file is accepted either way.

Can I use it on my phone?

Yes. Open the page in your phone's browser, choose the PDF from your files, and download the result.

Does my file leave my device?

No. Everything runs in your browser tab, so ID documents and certificates are never sent anywhere.