Compress PDF to 100 KB
Get a PDF under the 100 KB limit that exam boards and government portals insist on. Nothing is uploaded — which matters when the document is your certificate or ID.
- Select your PDF. The target is already set to 100 KB.
- Click Compress PDF and wait — the tool works out how much compression the limit requires.
- Open the downloaded file and check it is still readable before you submit it.
Why 100 KB, and why it is so hard
The 100 KB ceiling comes almost entirely from government and examination portals — recruitment boards, university admissions, licensing authorities. The limits were set when connections were slow and have never been revisited, so candidates uploading a phone scan of a certificate routinely arrive with a 3 MB file against a 100 KB cap. That is a thirty-fold reduction.
It is achievable, but only within limits worth understanding before you start.
The page-count problem
This is the thing that decides whether you succeed. A PDF's size is roughly the sum of its pages, so 100 KB is a budget split across however many pages you have:
| Pages | Budget per page | Result |
|---|---|---|
| 1 | ~100 KB | Comfortable. Text stays crisp. |
| 2–3 | ~35–50 KB | Fine for typical documents. Slight softening. |
| 5 | ~20 KB | Noticeably soft. Small print may struggle. |
| 10+ | ~10 KB or less | Not realistically legible. |
So before compressing harder, check how many pages the form actually requires. If it wants a degree certificate and you are uploading a six-page transcript, remove the pages you don't need. Cutting six pages to one turns an impossible target into an easy one.
Photograph it properly and the problem shrinks
Much of the file size in a bad scan is noise the compressor has to spend data encoding: shadows, background clutter, an uneven angle. A clean capture is smaller before you compress anything.
- Even daylight, no flash, no shadow across the page.
- Phone held parallel to the document, not tilted.
- Fill the frame with the document — crop out the desk.
- Use your phone's document scanner (Notes on iPhone, Google Drive on Android) rather than the plain camera. It flattens the background to clean white, which compresses far better than a photograph of a page.
Before you submit
Open the compressed file at 100% zoom and read the smallest text on it — a registration number, a date, a signature. If you cannot read it, neither can the person reviewing your application, and a rejected submission costs far more than another five minutes here. If it fails that check, reduce the page count rather than accepting an illegible file.