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How to Merge, Split & Compress PDFs for Free

By DocFila Team · February 13, 2026 · 5 min read

PDFs are the universal format for sharing documents — contracts, invoices, reports, presentations, and more. But working with PDFs often means you need to combine several files into one, extract specific pages, or reduce a bloated file size before emailing. Expensive desktop software used to be the only option. Today, you can do all three on your phone for free.

How to Merge PDFs (Combine Multiple Files Into One)

Merging PDFs is useful when you need to submit a single document that contains content from multiple sources — for example, combining a cover letter, resume, and portfolio into one application file.

Step-by-Step With DocFila

1. Open DocFila and navigate to PDF Tools.
2. Tap "Merge PDFs."
3. Add files. Import two or more PDFs from your device or your DocFila library.
4. Arrange the order. Drag and drop the files into the sequence you want. The first file becomes page one of the merged document.
5. Tap "Merge." DocFila combines the files into a single PDF in seconds.
6. Save or share. Export the merged PDF to your device or share it directly via email or messaging.

Tips for Merging

• Check page numbers after merging to ensure continuity.
• If you are merging scanned documents with digital PDFs, the file size may increase. Consider compressing afterward.
• To include photos (JPG, PNG), turn them into a PDF with the image to PDF tool first, then merge.

How to Split a PDF (Extract Specific Pages)

Splitting is the opposite of merging. You take a large PDF and extract specific pages — useful when you only need certain sections of a long report, or when you want to separate a multi-page scan into individual documents.

Step-by-Step With DocFila

1. Open DocFila and go to PDF Tools.
2. Tap "Split PDF."
3. Import your PDF. Select the file you want to split.
4. Review the pages. DocFila splits the PDF into one single-page PDF per page and lists them.
5. Tap "Split." DocFila creates the single-page PDFs.
6. Save or share the pages you need.

Tips for Splitting

• Use split when sharing only a relevant section of a contract or report to avoid sending unnecessary pages.
• To keep a range of pages as one file, merge the single pages you need back together, or delete the pages you do not need from a copy.
• The original PDF remains unchanged — splitting creates a copy.

How to Compress a PDF (Reduce File Size)

Large PDFs cause problems: email attachments get rejected, uploads take forever, and storage fills up quickly. Compression reduces file size, and image-heavy scans shrink the most; how much a file shrinks depends on the PDF.

Step-by-Step With DocFila

1. Open DocFila and go to PDF Tools.
2. Tap "Compress PDF."
3. Import your PDF.
4. Set the compression. A slider sets how much the file is compressed (lower means a smaller file with softer images):
   • Higher settings: keep more image detail and give a larger file.
   • The default: a balance of quality and size for most files.
   • Lower settings: give the smallest file and are best for email attachments where image quality is less critical.
5. Tap "Compress." The app processes the file on your device. Check the result before you send it.
6. Save or share the compressed PDF.

What Makes PDFs Large?

• Embedded images: Scanned documents and photo-heavy PDFs are the biggest offenders. Compression downscales and re-encodes these images.
• Fonts: Fully embedded fonts add size. Subsetting (embedding only the characters used) helps.
• Metadata and layers: Design files exported from Illustrator or InDesign may contain hidden layers and metadata that inflate file size.

Tips for Smaller PDFs

• Scan at 200–300 DPI instead of 600 DPI unless you need archival quality.
• Use Black & White mode for text-only documents — it produces dramatically smaller files than color scans.
• Compress after merging, not before, so you only compress once.

Why Choose DocFila Over Online PDF Tools?

Online PDF tools require you to upload sensitive documents to third-party servers. This creates privacy and security risks, especially for contracts, medical records, and financial documents. DocFila's PDF tools — merge, split, compress, rotate, watermark, password protection and image to PDF — run on your device, so your files stay on your phone unless you choose to share them. Converting a PDF to Word, or Excel and PowerPoint files to PDF, uses DocFila's online conversion service, and the app asks before it uploads the file.

• Works offline. The on-device PDF tools do not need an internet connection.
• Generous size limits. The on-device tools handle large files, with caps of 100–200 MB for conversions and compression, and files you save into your DocFila library are limited to 15 MB each.
• No watermarks on your edits. DocFila does not stamp a watermark on merged, split or compressed PDFs.
• All-in-one. Merge, split, compress, annotate, sign, and scan — all in a single app.

Master Your PDFs Today

Related DocFila tools

Keep going with the document workflow that matches this page. Open the tool you need, then finish the file in DocFila.