Merge PDF Online — Combine Files in Seconds
Merging PDF files is one of the most common document tasks in any professional environment. Whether you are assembling a multi-chapter report, combining invoices into a single statement, or packaging a portfolio for a client, the ability to merge PDFs quickly and reliably is essential.
Why merge PDFs instead of sending multiple files?
Sending a single consolidated PDF is almost always preferable to sending multiple separate files. A single file is easier for the recipient to open, easier to print, easier to archive, and far less likely to result in missing attachments. Contracts, proposals, and reports in particular benefit from being delivered as one cohesive document.
How to merge PDF files with PDF Size Reducer
Open the Merge PDF tool, upload all the files you want to combine, arrange them in the correct order by dragging the thumbnails, and click Merge. The entire process takes under thirty seconds. Your merged PDF retains bookmarks, annotations, and hyperlinks from the original files.
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Compress PDF Online — Reduce File Size Instantly
Large PDF files create friction at every step — they're slow to email, blocked by attachment limits, and cumbersome to upload. Compressing a PDF reduces its file size while preserving the visual quality that matters to your readers.
How does PDF compression work?
PDF compression primarily targets images embedded within the document, which are almost always the largest contributor to file size. PDF Size Reducer's compression engine resamples embedded images to a lower resolution that remains crisp on screen and in print, while stripping embedded fonts, metadata, and other overhead that adds to the file size without improving readability.
When should you compress a PDF?
Compress PDFs before emailing them as attachments, before uploading to portals with file size restrictions, and before storing in cloud services where storage costs money. A typical PDF can be reduced to 30–70% of its original size, making compression one of the highest-impact tools available.
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Convert PDF Files — Change Formats Without Losing Quality
PDF conversion is the bridge between the fixed, printable world of PDF and the editable world of Word documents, spreadsheets, and images. PDF Size Reducer offers both directions: converting PDFs into editable formats, and converting other formats into PDF.
PDF to Word — edit your documents again
Converting a PDF to a Word document (.docx) is the most common conversion request. PDF Size Reducer's PDF to Word converter uses advanced layout analysis to preserve the original document structure — including headings, tables, columns, and text formatting — so the converted Word file closely matches the original PDF in appearance.
Image to PDF — create PDFs from photos and scans
The Image to PDF tool accepts JPG, PNG, WEBP, and TIFF files and assembles them into a single PDF document. This is ideal for combining scanned pages, creating a PDF photo portfolio, or packaging visual assets for delivery to a client.
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Protect PDF Online — Add Passwords & Secure Sensitive Documents
Protecting PDF files with a password is a fundamental security measure for anyone who handles confidential documents. Legal contracts, medical records, financial statements, and business proposals all deserve to be secured before being transmitted over email or cloud storage.
What does password protection do?
PDF password protection uses AES-256 encryption to prevent unauthorised users from opening the document. Without the correct password, the file is entirely unreadable. You can also set a separate permissions password that allows the document to be opened but prevents printing, copying text, or editing the content.
When should you protect a PDF?
Protect PDFs when sharing financial documents, legal agreements, HR records, or any file containing personally identifiable information. Best practice is to send the password to the recipient through a different channel than the document itself — share the PDF via email and the password via text message or phone call.
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