Compress PDF to KB
Shrink a PDF, or turn photos of certificates into one PDF, so it lands inside an exact KB range such as under 100 KB or 50 to 300 KB, with page reordering, rotation and a black and white option.
Runs in your browser — nothing is uploadedFree trial: 1 run of Compress PDF to KB every day. After that, 2 credits per run.
A PDF that lands inside the size range the upload form accepts
Upload portals often want a certificate as a PDF between two sizes, such as 50 to 300 KB, or simply under 100 KB. Add your PDF, or photos of the pages, choose the rule, and the tool redraws the pages at the resolution and quality that fit, then shows the exact size.
Pages are processed in your browser. Password-protected PDFs can be opened with their password, which also stays on your device.
What Compress PDF to KB gives you
A range, in one step
The search checks the maximum and the minimum together, trying quality first and then resolution, instead of making you compress and then enlarge in separate tools.
Photos of certificates to one PDF
Add several phone photos, reorder and rotate them, and they become one PDF with each photo fitted on an A4 page.
Cleaner scans
Black and white and "Whiten the paper" remove shadows and grey paper, which makes pages easier to read and smaller.
Honest about readability
The final resolution is shown, with a warning below 100 dpi, and a PDF that already fits can be downloaded untouched.
How to use Compress PDF to KB
Choose the size rule
Pick an exam rule, an "Under N KB" option, or a custom range.
Add the PDF or photos
Remove, rotate or reorder pages until the list matches what the form needs.
Make the PDF and check it
Open the result and make sure every page is readable before uploading it.
Other names for this tool
People also look for this as PDF size reducer, reduce PDF size in KB, PDF compressor to KB, JPG to PDF under 100 KB and certificate PDF compressor. It is the same tool on this page.
Looking for the opposite job? Compress PDF.
Limitations
- Pages are saved as images, so text is not selectable and links and form fields are removed.
- Very long documents cannot fit small limits legibly; the tool warns when the resolution falls below 100 dpi.
Questions about Compress PDF to KB
Why can the text no longer be selected?
To reach a fixed size, each page is redrawn as a JPEG image. That is what makes a hard size limit reachable, and it is why the text layer is not kept.
Can it make a PDF bigger?
Only by redrawing pages at a higher resolution or quality. It never pads a file with junk data to reach a minimum size.
How do I compress a PDF to 100 KB?
Choose "Under 100 KB", add the file and press Make the PDF. One or two scanned pages usually fit at a readable resolution; a long document may need pages removed or split into separate uploads.
Why is the text in the new PDF not selectable?
Each page is saved as a JPEG image, which is how a fixed size becomes reachable. Upload portals only need to display the page, so this rarely matters, but keep your original file for anything else.
What if my PDF is smaller than the minimum?
The pages are redrawn at a higher resolution or quality until the file reaches the minimum. If even 300 dpi at high quality stays below it, the tool says so rather than padding the file with meaningless data.
Can it open a password-protected bank or exam PDF?
Yes. Enter the password when asked and the file opens in your browser. The new PDF is saved without the password, so keep it somewhere private.
How many pages can fit in 100 KB?
It depends on how busy the pages are. Plain text pages shrink far more than photos. The result shows the resolution used, and anything below 100 dpi comes with a warning to check that small print can still be read.