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Compress a PDF to 100 KB

Get a PDF under 100 KB for an upload form. Text is kept when possible; pages become images only if they must.

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Hitting a size limit

The text is kept first, with stronger image compression at each step. Only if the file still does not fit are the pages turned into images, and the result tells you when that happened.

Drop a PDF here or click to choose onePDF files up to 100.0 MB each.

Processed on this device with your browser. Nothing is uploaded.

How it works

A 100 KB limit is common on older government and exam portals and on some job application systems, which often ask for scanned certificates, ID proofs and signatures as separate small PDFs. Choose your PDF and the tool rebuilds it at the best quality that fits under 100 KB.

How it works, honestly: the text is kept first. The photos and scanned pages inside the PDF are resampled to the resolution the page really needs and re-saved as JPEG, duplicate and unused data is removed, and the file is recompressed, so text stays selectable and searchable and links and form fields keep working. Only when that still cannot reach the size you need are the pages turned into images as a last resort; then the text can no longer be selected, searched or copied, and the result tells you so. Keep your original.

Be realistic about page count: 100 KB is a small budget, and every extra page lowers the resolution each page can have. For multi-page documents, check whether the portal allows one file per document, then split the PDF or remove pages you do not need before compressing. Turn on black and white for text scans; it often halves the size.

What the 100 KB compressor did to real files

Measured on 2026-09-22 with this page's own compressor in Chrome. The test files were a 3-page scanned document (each page a 300 dpi image of printed text, 4.8 MB) and a 6-page report exported from a word processor (selectable 10.5-point text and one photo, 253 KB).

100 KB for a whole PDF is very tight. The text report got there without losing anything that matters: its one photo was re-encoded and the file recompressed, and all 3,770 words are still selectable text. The 3-page scan could not fit by shrinking its images alone, so its pages were turned into images at about 57 dpi; 10-point text was still readable on screen, but soft, and it would print poorly. The result said both things plainly.

For a scan that must fit 100 KB, the most effective moves are to send fewer pages (Remove PDF pages or Split PDF), convert to grayscale, or upload the one page that matters as a compressed JPG.

Test fileResultLowest image resolutionWhat the tool did
3-page scan, 4.8 MB98 KBabout 57 dpi (pages)Pages turned into images, with a warning below 100 dpi
6-page text report, 253 KB69 KBnot lowered (its one photo was only re-encoded)Text kept (Recommended level)

How to use it

  1. Choose the PDF; the target is already set to 100 KB.
  2. Turn on black and white for scans of printed text.
  3. Click Compress PDF and check the size and the resolution reported.
  4. Open the result and zoom in on the smallest print before you upload.

Frequently asked questions

Are my files uploaded?

No. The file is read and processed by your browser on your device; nothing is sent to a server. The PDF engine is downloaded from this site the first time you use a tool and then runs on your device.

Will the text still be selectable?

In most cases, yes: the tool shrinks the images inside the PDF and cleans up the file, and leaves text, fonts, links and form fields as they are. Only if the size you need cannot be reached that way are the pages turned into pictures, and the result says so clearly. For a scan this changes little, because its pages were pictures already (any OCR text layer is kept in keep-text mode).

What if the PDF hardly gets smaller?

Text-only PDFs made by Word or a web browser are often already compact: text takes very little space and there are no big images to shrink. The tool tells you when nothing could be saved and keeps your original. Turning such pages into images would usually make them bigger, not smaller.

My PDF did not get under 100 KB. What now?

The tool stops lowering the resolution before pages become unreadable. Remove pages that are not required, split the document into separate uploads, or rescan at 150 dpi in black and white.

Is 100 KB the same as 0.1 MB?

Roughly. Here 1 KB is 1,024 bytes, so 100 KB is 102,400 bytes. A portal that counts 1 KB as 1,000 bytes allows only 100,000 bytes; to be safe there, use the main PDF compressor with a target of 95 KB.

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