Is there a limit on the number of PDFs I can merge?

No hard limit is enforced. However, since the files are processed entirely securely's RAM, combining very large files (e.g. over 100MB total) may depend on your device memory.

Can I adjust the page order inside a PDF?

Our tool merges documents in the order you list them. If you need to separate and re-order pages, you can use our Split PDF tool first, then merge the parts.

Is my personal data secure while merging PDFs?

Yes, the entire merge process happens in your local browser sandbox. No document data is sent to our servers, keeping your private certificates completely secure.

What exactly does the 300KB file size limit mean?

The 300KB size limit requires your document or photo to be strictly smaller than 307,200 bytes on disk. Government portals and application databases will automatically reject any upload that exceeds this exact byte capacity.

Can I compress a very large file (e.g. 5MB) down to 300KB?

Yes. Depending on the original file size, our local processing engine will apply aggressive JPEG quantization and iterative canvas scaling to mathematically ensure the final output file is under the 300KB target limit.

Merge PDF to 300KB

Combine multiple PDF documents or certificates into a single file. Control order, sort pages, and optimize output size.

Official Guidelines Compliance

How to compress your file to 300KB

When applying for exams like IBPS, UPSC, or SSC, you are frequently asked to combine multiple credentials—such as high school marksheets, graduation degrees, and caste certificates—into a single PDF file. The combined file must also comply with size ceilings. Our secure Merge PDF tool lets you combine multiple PDF documents, sort pages visually, and optimize the output size, all without sending sensitive educational records to external servers. Large files can cause upload failures on strict portals or delay email delivery. Our advanced local processing engine ensures your file is shrunk to exactly 300KB.

How to Use Merge PDF to 300KB

Follow these simple steps to safely compress your file to 300KB.

Choose PDF Files for 300KB

Select two or more PDF files from your device to merge together.

Arrange File Order

Drag and drop the files in the list to arrange them in the exact order they should appear in the merged document. Merge 300KB.

Merge and Download

Set your target size constraint and click the merge button to download the combined PDF.

Frequently Asked Questions about 300KB

Answers to common questions about compressing to 300KB.

Is there a limit on the number of PDFs I can merge? No hard limit is enforced. However, since the files are processed entirely securely's RAM, combining very large files (e.g. over 100MB total) may depend on your device memory.: No hard limit is enforced. However, since the files are processed entirely securely's RAM, combining very large files (e.g. over 100MB total) may depend on your device memory.
Can I adjust the page order inside a PDF? Our tool merges documents in the order you list them. If you need to separate and re-order pages, you can use our Split PDF tool first, then merge the parts.: Our tool merges documents in the order you list them. If you need to separate and re-order pages, you can use our Split PDF tool first, then merge the parts.
Is my personal data secure while merging PDFs? Yes, the entire merge process happens in your local browser sandbox. No document data is sent to our servers, keeping your private certificates completely secure.: Yes, the entire merge process happens in your local browser sandbox. No document data is sent to our servers, keeping your private certificates completely secure.
Frequently Asked Questions about 300KB? Answers to common questions about compressing to 300KB.: Answers to common questions about compressing to 300KB.
What exactly does the 300KB file size limit mean? The 300KB size limit requires your document or photo to be strictly smaller than 307,200 bytes on disk. Government portals and application databases will automatically reject any upload that exceeds this exact byte capacity.: The 300KB size limit requires your document or photo to be strictly smaller than 307,200 bytes on disk. Government portals and application databases will automatically reject any upload that exceeds this exact byte capacity.
Can I compress a very large file (e.g. 5MB) down to 300KB? Yes. Depending on the original file size, our local processing engine will apply aggressive JPEG quantization and iterative canvas scaling to mathematically ensure the final output file is under the 300KB target limit.: Yes. Depending on the original file size, our local processing engine will apply aggressive JPEG quantization and iterative canvas scaling to mathematically ensure the final output file is under the 300KB target limit.