Compress a PDF to under 1 MB
1 MB is one of the most common limits on online forms: virtual front desks, job applications, insurance claims and school enrolments. The target of 1 MB is already filled in below: drop your PDF, press Compress and download a file that fits.
Drop your PDF here
or pick a file from your device
- Drop your PDF onto the box or press Select PDF. Nothing is uploaded: the file is read inside this tab.
- Leave Smart selected and the target at 1 MB. CLEKARA tests sample pages with every profile and picks the gentlest one that gets under 1 MB.
- Press Compress PDF. The result is opened and checked; the message tells you whether the target was reached and the exact final size.
How it gets under 1 MB
A text document exported from Word is usually far below 1 MB already; what pushes a PDF over the limit is almost always photos or scanned pages. Those are exactly what the compressor reduces.
Compression runs on Ghostscript compiled to WebAssembly, inside your browser. If even the strongest profile is not enough, it lowers the resolution of the images step by step (80, 60 and 45 dpi) until the file fits, and the message says how far it went. If it still cannot fit, you get the smallest valid result with suggestions — never a broken file.
When the target cannot be reached
Most of the weight in a PDF comes from images. A file that is already optimised, or mostly text with embedded fonts, has little left to remove. Digitally signed PDFs are blocked on purpose, because rewriting them would invalidate the signature.
Frequently asked questions
Does 1 MB mean 1,000 KB or 1,024 KB?
It depends on the website, so CLEKARA uses the strictest one: the result must weigh no more than 1,000,000 bytes. A file that passes that check is accepted by any form that says “maximum 1 MB”.
Is my document uploaded to a server?
No. The PDF never leaves your device; the compression engine runs in this browser tab.
Can I choose a different size?
Yes. Change the number in “Optional target size” to any value in MB, or use the links above for other common sizes.
Is it free?
Yes, with no account, no watermark and no daily limit.