Reduce a PDF to under 1 MB for a portal, an email or a messaging app. With a megabyte to spend, most documents keep their selectable text and only their photos are re-saved. You see the exact size in bytes before you download, and the PDF is compressed in your browser, never uploaded.
How to use Compress PDF to 1MB
Choose a PDF. The Target size is already 1 MB; pick another size or Custom if your limit differs.
Click Compress to 1 MB.
Check the exact size in bytes and whether it's under 1,000,000 bytes.
Click Download PDF.
Frequently asked questions
How do I compress a PDF to under 1 MB?
Choose it here and click Compress to 1 MB. It starts with the gentlest settings and stops at the best quality that fits.
What does 1 MB mean here?
1 KB is counted as 1,000 bytes, so the target is at most 1,000,000 bytes. That is the stricter count, so the file also passes portals that count 1 KB as 1,024 bytes. The result shows its exact size in bytes, so you can compare it with your form's limit.
Will compressing to 1 MB lower the quality?
Only as much as needed. If the lossless repack fits, nothing visible changes. Otherwise photos are re-saved at a lower dpi and quality while text and drawings stay sharp. Pages are turned into images only if that still isn't enough.
Can a long scanned document fit in 1 MB?
Often, but it depends on the page count: 20 pages leave 50,000 bytes each, so the pages may be re-saved at a low dpi. If the result is too soft to read, split the PDF into parts and compress each one.
Is 1 MB small enough for email?
Yes. Email services allow much bigger attachments, but a 1 MB PDF sends quickly and fits inboxes and forms with tighter limits.
Does it work on my phone?
Yes. It runs in mobile browsers with no app to install. Large PDFs take longer on a phone, because each attempt is computed on the device.
Is my PDF uploaded?
No. It never leaves your device.
Where a 1 MB limit is common
Upload portals for applications, claims and KYC that take a full document rather than a single page. Check the limit in the portal's own instructions.
Sending a document in a chat or by email so it opens quickly on a phone.
Scanned documents made with Scan to PDF or JPG to PDF, which can be several MB straight from the camera.
How the 1 MB target is reached
First the file is restructured losslessly; if that already fits, nothing visible changes. Next, photos inside the PDF are re-saved as JPEG, starting at 150 dpi and 72% quality and stepping down to 60 dpi and 40%. Text, fonts and vector drawings aren't touched, so the text stays selectable and searchable. Only if that still isn't enough is every page turned into a picture, from 150 dpi down to 50 dpi. At each stage the tool searches for the highest setting that fits instead of jumping to the smallest.
What happens to the text
When the text and fonts on their own are bigger than the target, the only way to fit is to turn each page into an image. The page still looks the same at normal zoom, but its text can't be selected, searched or copied, links and form fields stop working, and fine print gets softer as the dpi drops. The result tells you which of the two happened. If you need the text back, run OCR PDF on the result, but note that adding a text layer makes the file bigger again.