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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, Files app, or cloud storage (Google Drive, iCloud, Dropbox).
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.
• You can also merge images (JPG, PNG) with PDFs — DocFila converts them automatically.

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. Choose your pages. Enter a page range (e.g., 3–7) or select individual pages from the thumbnail view.
5. Tap "Split." DocFila creates a new PDF with only the selected pages.
6. Save or share the extracted PDF.

Tips for Splitting

• Use split when sharing only a relevant section of a contract or report to avoid sending unnecessary pages.
• You can split a PDF into individual single-page files if you need to process each page separately.
• 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 while maintaining acceptable quality — often shrinking a 20 MB file to under 2 MB.

Step-by-Step With DocFila

1. Open DocFila and go to PDF Tools.
2. Tap "Compress PDF."
3. Import your PDF.
4. Choose compression level. DocFila offers three presets:
   • Low compression: Minimal quality loss, moderate size reduction (~30–40%).
   • Medium compression: Good balance of quality and size (~50–60%).
   • High compression: Maximum size reduction (~70–80%) — best for email attachments where image quality is less critical.
5. Tap "Compress." The app processes the file and shows you the before-and-after file size.
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 the engine can optimize the combined file holistically.

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 processes everything on your device — your files never leave your phone unless you choose to share them.

• 100% offline processing. No uploads, no servers, no data leaks.
• No file size limits. Online tools often cap at 10–25 MB. DocFila handles files of any size.
• No watermarks. Free tools often stamp watermarks on your output. DocFila does not.
• All-in-one. Merge, split, compress, annotate, sign, and scan — all in a single app.

Master Your PDFs Today