Choose a format for the actual use
JPEG is often suitable for photographs when transparency is unnecessary. PNG is useful for crisp graphics or transparent backgrounds. WebP can reduce file size when the receiving platform supports it. No format is best for every situation, so check the destination's accepted formats before converting.
Keep a high-quality original. Repeatedly converting a lossy image can accumulate artifacts, and changing a file extension does not convert the underlying image data. Use an actual conversion tool and inspect the result.
- Use transparency only when the destination needs it.
- Check the final file extension and open the exported file.
- Retain the original for future edits or alternate sizes.
Crop and resize before final compression
Crop to the intended composition, then resize to the destination's pixel dimensions. Preserve the aspect ratio unless the design intentionally calls for a different shape. Enlarging a small image usually cannot restore missing detail; if it looks soft, return to a larger source rather than repeatedly increasing dimensions.
Compress after you have chosen the crop and output dimensions. Compare fine text, thin lines, gradients, and edge details at normal display size. For important artwork, compare the output against the original before replacing it.
- Avoid stretching logos or product photographs.
- Check both pixel dimensions and file size.
- Review transparency against light and dark backgrounds.
Combine images into a PDF
If you are preparing receipts, scans, forms, or a visual handout, put the images in the intended order before exporting them to PDF. Check page orientation, page margins, legibility, and whether each image fits the page without cropping important content. A PDF container does not automatically make low-resolution text readable.
After export, reopen the PDF in a separate viewer and inspect every page. Confirm the page count and order, and test the file against any upload or email size limit.
- Rotate portrait and landscape pages intentionally.
- Use descriptive filenames and avoid unintended blank pages.
- Check small print and handwritten notes at useful zoom levels.
Troubleshoot common quality problems
A halo around a removed background may come from edge pixels that resemble the background. A file that looks washed out may have been converted with different color handling. A PDF with blurry text may contain a low-resolution source image rather than selectable text. Return to the original and change one variable at a time to find the cause.
- Test exported images in the context where they will appear.
- Do not assume a color-based background remover can distinguish every subject from a similar-colored background.
- Keep a quality version separate from a compressed delivery copy.
Example: prepare a set of receipts for submission
Start with the clearest original scans, rotate pages upright, crop only empty borders, and retain any required dates, totals, or signatures. Resize only if the submission instructions require it. Combine the images into a PDF, then check page order, legibility, and file size after downloading.
- Do not crop out evidence or context the recipient requires.
- Keep a backup of the original images.
- Inspect the PDF at a zoom level that makes small print readable.
Why output quality can change
Compression, resizing, and format conversion each affect the result differently. Repeated lossy conversions may create artifacts; an image-to-PDF conversion may preserve the image exactly but cannot recover details that were absent from the source. If the result is blurry, return to a higher-quality source and change one setting at a time.
- Test transparency against the actual background.
- Check accepted formats before converting logos or graphics.
- Compare the final downloaded output, not just the preview.
Before you finish: checklist
Use this quick review to catch common mistakes before you rely on or share the result.
- Destination format and size requirements confirmed
- Original images retained
- Crop and aspect ratio reviewed
- Output format opens correctly
- PDF page order and orientation checked
- Text and fine details readable in the downloaded file
Frequently asked questions
Does converting an image to PDF improve its resolution?
No. It places the image in a PDF container; it does not restore detail missing from the source. Start with a clearer image when text is unreadable.
Should I use PNG or JPEG?
Choose based on the image and destination. PNG is useful for transparency and crisp graphics; JPEG is often practical for photographs without transparency. Confirm platform support.
Why is my PDF still large after converting images?
High-resolution images can make a PDF large. Resize or compress only as much as the recipient permits, and check that small text remains readable.