Compress PDF to Exact Size
Fit a PDF under an exact file-size limit.
Most regular PDF tools run in this browser tab on your device. They are not uploaded to a server as part of the standard workflow.
About Compress PDF to Exact Size
Most compression tools answer one question: how small can this file get? That is the wrong question when something is already telling you a number. An email server rejecting anything over 1 MB, a university portal capping submissions at 500 KB, a job application form asking for 200 KB — in each case the size is a hard limit you already know, and what you need is the smallest file that is still legible at that size, not the smallest file period.
This tool works towards that number. It renders your pages, measures the real file, and if it is still too large it tries again at a lower quality and a lower resolution, stopping as soon as it fits. Every size you see on the result screen was measured from a file this tool actually produced — nothing is estimated.
Sometimes the target cannot be met. A PDF has a floor below which its pages stop being readable, and a high-resolution scan or a document full of photographs may not fit under a small limit without becoming unreadable. When that happens you get the smallest legible file we could make, with its real size shown, rather than a file that quietly misses the target. Try a larger target or the Low setting in that case.
Nothing is uploaded. Every render happens in this browser tab on your own device, so your document never travels across the internet at all.
How to Compress PDF to Exact Size
Drop in the PDF you need to shrink
One file at a time, up to 50 MB. If it is already smaller than your target, you get it straight back unchanged — compressing it would only make it bigger.
Choose a target size
Pick 100 KB, 200 KB, 500 KB or 1 MB, or type your own such as 250 KB. These are the limits that upload forms and mail servers actually enforce.
Pick how hard to work at it
Low will work hardest to hit a small target and may soften the text. High gives up rather than pushing a page below the point where it stays readable.
Download the result
The screen shows the real measured sizes and whether the target was met. If it says it could not reach the target, the file you get is the smallest legible one we could make, with its actual size stated.
Compress PDF to Exact Size details and limits
When a PDF cannot be made small enough
A PDF has a floor, not a knob. Below a certain point the text on a page stops being readable, and a page that cannot be read is not a compressed document — it is a broken one. A high-resolution scan or a document that is mostly photographs may simply not fit under 100 KB at any legible quality. When that happens this tool returns the smallest file it could actually produce and says plainly that the target was missed, rather than handing over a file that quietly fails the upload form.
Why the page count makes this slower
Hitting a target means re-rendering every page at several quality and resolution settings, measuring the real file each time, and stopping as soon as it fits. A forty-page scan is re-rendered several times over, which is why the progress bar shows several passes. Nothing is estimated: every size shown was measured from a file this page actually produced.
Choosing a setting that suits the target
High is the right choice for a target you expect to reach easily, because it stops rather than trading sharpness away for no gain. Low is the one that reaches small targets, at the cost of softer text. Balanced suits the middle, and is the setting to use when you do not yet know whether your document will fit.
What happens to a file already under the target
It is returned untouched. Re-encoding a file that already meets the limit would make it larger and spend quality for nothing, so the tool says what it did and hands back the original bytes.
Compress PDF to Exact Size questions
Will my PDF definitely reach the size I choose?
Not always, and we would rather tell you than quietly hand you a file that misses the target. A PDF has a floor below which its pages stop being readable, so a high-resolution scan may not fit under 100 KB without becoming unreadable. When that happens you get the smallest legible file we could make, with its real size shown. If the result is too small or too large for your purpose, try the same file with a different target.
Why does hitting an exact size take longer than normal compression?
Normal compression makes three versions and keeps the smallest. Hitting a target means re-rendering your pages several times at different quality and resolution settings, checking the real size each time, and stopping as soon as it fits. On a long scanned document that is noticeably more work — it is why the progress bar shows several passes rather than one.
What is the difference between low, balanced and high?
They set how far down the quality search is allowed to go. Low will work harder to reach a small target and may reduce text sharpness. High gives up sooner rather than pushing a page below the point where it stays readable. If a target is unreachable, Low is the setting most likely to reach it.
Is my file uploaded?
No. Every render happens in this browser tab on your own device. Your PDF is never sent to a server, which is also why a very large document depends on how much memory your phone or computer has free.
My PDF was already smaller than the target. Why was nothing changed?
Because compressing it would only have made it larger and cost you quality for nothing. The tool returns your original file untouched and says so.
Add this to your home screen
Opens straight to a tool, with the pages already downloaded — useful on a phone, where you are compressing between other things.