Free Online Image to PDF Converter

Using Micro PDF's image to PDF tool, multiple images (supporting JPG, PNG, BMP, GIF formats) can be merged into a single PDF file with one click. You can adjust image sorting, page size and orientation. The generated PDF is suitable for image archiving, document scanning organization, photo collection creation, etc., avoiding scattered image management.

Whether it's ID photos taken on your phone, design material images, or screenshots, Micro PDF can quickly merge them. Free users can enjoy unlimited conversion with simple and efficient operation.

Table of Contents

• Key Points
• How to Use Micro PDF to Convert Images to PDF
• Page Settings and Image Optimization Options
• Conversion Results and Application Scenarios
• Multi-Platform Support and Batch Conversion Features
• Frequently Asked Questions

Key Points

• Multiple format support: Compatible with mainstream image formats such as JPG, PNG, BMP, GIF, no format preprocessing required.
• Flexible sorting: After upload, you can drag and drop to adjust image order, ensuring PDF page order meets requirements.
• Customizable pages: Supports adjusting page size (A4, Letter, custom), orientation (landscape/portrait) and margins.
• Image optimization: Automatically compresses oversized images (optional), maintaining clarity while reducing PDF size.
• Free and unlimited: Single image up to 10MB, maximum 30 images per session, unlimited daily usage.

How to Use Micro PDF to Convert Images to PDF

Micro PDF's image to PDF tool is simple to operate, completed in 3 steps:

1. Visit Micro PDF official website: Micro PDF, click on the "Image to PDF" tool entry.
2. Upload images: Click "Select Images" or drag and drop files (supports mixed formats, up to 30 per session), drag to adjust order after upload.
3. Customize settings: Select page size (default A4), orientation (default portrait), check "Compress Images" (optional), click "Start Merging", click "Download PDF" to save file after completion.

Efficient Merging Tips

• Document scanning organization: Arrange ID card front/back, diploma images in order, select "Small Margins" to generate compact PDF archives.
• Photo collection creation: Select "Landscape A4"+"No Compression" to preserve high-quality photo quality, suitable for family album archiving.
• Screenshot stitching: Merge long screenshots in order to PDF, select "Adaptive Pages" to automatically adjust image size to fit pages.

Page Settings and Image Optimization Options

Different settings adapt to different scenarios, effects as follows:

Image Processing Details:

• PNG transparent background: Transparent areas preserved after conversion, displayed as white background in PDF (PDF doesn't support transparency layers).
• GIF animations: Only retains first frame static image, dynamic effects not supported.
• Oversized images: Automatically reduced to page size (can manually set "No Scaling", may cause content to exceed page).

Conversion Results and Application Scenarios

Micro PDF converted PDFs perform excellently in multiple scenarios:

• Document archiving: Merge ID cards, bank cards images into PDF for online submission or printing, avoiding image loss.
• Design material organization: Merge multiple design sketches, material images into PDF, generate visual material library for easy reference.
• Meeting records: Merge whiteboard photos, note photos in order to PDF, forming complete meeting minutes for sharing.
• Student assignments: Merge hand-drawn assignments, experiment report photos into PDF, standardize submission format for easy teacher review.

Multi-Platform Support and Batch Conversion Features

Micro PDF's image to PDF tool supports all-scenario usage:

• Web-based: Computer browser batch upload images, suitable for processing local design materials or screenshots, supports drag-and-drop sorting.
• Mobile: WeChat mini-program "Micro PDF" supports direct upload and merging after phone photography, suitable for organizing ID photos while traveling.
• Desktop: Client supports reading entire image folders for batch merging, automatically sorts by filename, suitable for large image processing.

Frequently Asked Questions

1. What to do if merged PDF image order is disorganized?

After upload, you can drag image thumbnails to adjust order. Left-side numbers are page numbers, confirm before clicking merge.

2. What are the limitations for free users?

Free users maximum 30 images per session, single image maximum 10MB; VIP users support 100 images per session, single image 200MB, unlock custom watermark function.

3. Image rotation angle is incorrect, can it be adjusted after merging?

Yes. After upload, click the "Rotate" button below each image (left/right rotate 90 degrees), adjust to correct direction before merging.

4. Can text descriptions be added to merged PDF?

Yes. Use Micro PDF's "Edit PDF" tool to add text annotations below images (such as document names, capture time).

5. When mixing landscape and portrait images, will pages be disorganized?

No. Select "Adaptive Orientation" (default enabled), tool automatically adjusts each page orientation according to image ratio, landscape images use landscape pages, portrait uses portrait pages.

6. Merged PDF size is too large, how to reduce?

Check "Deep Compression" during conversion, or optimize with "PDF Compression" tool, can reduce over 50% in size (slight clarity loss).

7. Can page numbers or table of contents be added to merged PDF?

Yes (VIP feature). Check "Add Page Numbers" during merging, automatically adds sequence numbers to bottom of each page; multiple image groups can be merged separately first, then use "PDF Merge" tool to add table of contents.