Merge and Compress PDF Online
Combine multiple PDFs into one file, then shrink it for Gmail and Outlook — free step-by-step workflow on FileToolsHub.
Most email-ready PDF packets need two jobs: merge separate files into one document, then compress so the attachment clears inbox limits. Merging alone often leaves a 20–40 MB scan stack; compressing alone cannot fix a folder of separate PDFs.
This workflow uses FileToolsHub’s free Merge PDF and Compress PDF tools. Keep the uncompressed merge as your archive master; send the compressed copy to clients and portals.
Step-by-step
Merge files in order
Open Merge PDF, upload PDFs cover-first, and download one combined document.
Open merge pdfRemove blanks (optional)
If scans include blank pages, open Edit PDF Pages and delete them before merging.
Open edit pdf pagesCompress for email
Upload the merged PDF to Compress PDF and download the smaller attachment.
Open compress pdfPassword protect (optional)
Lock sensitive packets with Protect PDF and share the password separately.
Open protect pdf
Tips
- Gmail and many portals cap attachments around 25 MB — compress after merge, not before.
- Fix sideways phone scans with Rotate PDF before merging so readers do not open a crooked packet.
- If compression is not enough, split the document with Split PDF and send parts separately.
Related workflows
Tools in this workflow
Merge PDF
Use this PDF merger to combine two or more PDFs into one file, in the order you upload them. Each file can be up to 25 MB.
Compress PDF
Rewrite a PDF with object streams so the file may get smaller. Embedded photos are not resampled.
Edit PDF Pages
Reorder or delete pages in a PDF document.
Protect PDF
Add a password to protect your PDF from unauthorized access.
Split PDF
Use this PDF splitter to save chosen pages, or every page, as separate PDFs. Two or more pages download as a ZIP.