100 KB is the classic portal limit for a single scanned document. Drop the file in and the tool works down to it in three stages, cheapest first, stopping as soon as one fits.
A one-page ID scan or a two-page text document clears it. A ten-page colour form does not, and the tool says so plainly rather than handing back something that missed.
The 100 KB ceiling appears on the forms where the document is a single page: an ID card, a photograph page, a signature specimen, a school-leaving certificate. On those it is achievable with room to spare. On a multi-page colour form it is achievable only by accepting a soft image, and the tool will tell you which of the two you have.
Where the 100 KB limit comes from
- Indian and South Asian government portals: ID and certificate uploads100 KB per file
- School and university admission forms100 to 200 KB
- State recruitment and exam portals50 to 100 KB
- Photo and signature specimen uploadsOften 20 to 50 KB, as JPEG
- Older municipal and utility portals100 KB, unchanged for years
Numbers like this are written into an upload form at launch and then outlive the hardware that justified them. There is usually nobody left to appeal to, so the workable answer is a file that clears the cap while staying readable.
How the tool hits 100 KB
Add the PDF
Most files that arrive here are one page: an Aadhaar or PAN scan, a degree certificate, a signature specimen. It is read into browser memory, so a slow connection costs nothing and the document never leaves the machine.
The cheap stages, and how far down the ladder they go
Structure is cleared first, which costs no quality at all. The images then walk the ladder, and a one-page text document usually stops within the first three rungs, while a colour ID scan tends to run out of ladder before it reaches 100 KB.
Stage three, which colour scans usually need
A text document rarely gets this far. A colour ID scan almost always does: the pages are rebuilt as pictures at a resolution worked out from a 150 dpi probe, with an invisible text layer behind them so a certificate number can still be searched.
Download, and read the result line
It names the final size and the stage that produced it. For a single ID page a rebuild at 100 dpi or above is still perfectly legible on screen, which is how a portal clerk will actually look at it.
Structure, then the images in place, then the pages as pictures. It stops at the first stage that fits.
Untouched at the first two stages. If the pages do get rebuilt, an invisible text layer keeps them searchable.
The IDs, forms and statements people compress for portals never leave the device.
What fits in 100 KB, and what does not
It depends almost entirely on whether the page is text or a photograph. Black type on white compresses to very little, while a colour scan of the same page can be twenty times larger, because every pixel of a photograph carries information worth keeping. The estimator below predicts which attempt your file will need.
When it cannot reach 100 KB
A one-page document that misses 100 KB is nearly always carrying pixels it does not need. Three moves, cheapest first:
- Crop to the document. A phone photograph of an ID card is mostly desk. Cropping to the card before making the PDF can triple the detail that 100 KB buys.
- Use the separate slots. Where a portal has one field for the front and one for the back, two files at 100 KB each carry twice the detail of one file holding both pages. Split PDF will separate them.
- Go back to the first copy. A screenshot of a scan, or a scan that has been through a messaging app, has already lost detail and will compress badly. Start again from the original.
Getting a single ID page under 100 KB cleanly
Most 100 KB uploads are one page, and one page is where preparation pays. The tool can only work with the pixels it is given, so a smaller, cleaner starting image reaches the cap at a higher rung of the ladder.
- Crop to the card. A phone photo of an ID card on a desk is mostly desk. Crop to the card before making the PDF, and the same 100 KB buys three times the detail.
- Greyscale beats colour. Unless the portal insists on colour, a greyscale scan at 150 dpi is sharper at 100 KB than a colour scan at any setting.
- One page per file. If the portal has separate slots for front and back, use them. Two single-page files at 100 KB each carry twice the detail of one two-page file.
- Start from the original. A screenshot of a scan, or a scan that has been through WhatsApp, has already lost detail. Go back to the first copy.
Where people use the 100 KB target
- Aadhaar, PAN and driving licence uploads1 page, fits
- School-leaving and degree certificates1 to 2 pages, fits
- Signature specimen pages1 page, fits easily
- Short declarations and affidavits1 to 3 pages, usually fits
Why this runs in your browser
The documents that get compressed to 100 KB are Aadhaar cards, PAN cards, degree certificates and signature specimens, all of which identify you completely. Uploading one to a compression site before uploading it to the portal hands a copy to a second party for no benefit at all.
The tool is right above
Everything on this page runs in your browser. Scroll up, drop the file, and keep it on your machine.
Common questions
The questions people ask with a 100 KB portal cap in front of them.
01Can any PDF fit in 100 KB?
A one-page ID scan or a two-page text document, yes, usually at the first or second attempt. A ten-page colour scan cannot while staying legible. Split it and upload the parts if the portal allows, or ask whether the stated limit is really per file.
02Which portals ask for 100 KB?
Mostly Indian and South Asian government and admissions portals, for ID documents, certificates and declarations. The number dates from when server storage was expensive and has rarely been revisited.
03Will the text still be readable?
For a text document, yes, at the first attempt. For a colour ID scan the later attempts soften it visibly, though a portal clerk reading it on screen will not usually notice.
04Will the text still be selectable?
Usually. The first two stages leave your text alone entirely. If the file only fits by rebuilding the pages, the certificate number can still be searched thanks to the layer written behind them.
05What if the file cannot get under 100 KB?
You still get the smallest attempt, labelled honestly. For a single page the fix is almost always a tighter crop rather than harder compression, since a photo of a card is mostly desk.
06My file was already small. Why did it grow?
It returns an already-small file untouched. A signature specimen is often well under 100 KB to begin with, and nothing is gained by putting it through again.
07Are my files uploaded anywhere?
No. Rendering and compression run in your browser. The file never leaves the device.
08Is it free?
Free. Every tool, unlimited use, no signup.