Table of contents
Quick answerStep-by-step guidePractical tipsCommon mistakesA practical format checklistQuick answer
JPG is best for photos and small image files. PNG is best for screenshots, graphics, and transparency. PDF is best for documents, page order, printing, and records. MDN has a practical image file type and format guide that explains common image formats in more detail.
Many file problems happen because people choose a format by habit instead of by destination. Before converting, check what the website, email recipient, printer, or application portal actually accepts.
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Step-by-step guide
Choose JPG when you need a photo-like image with a smaller file size. It is widely supported and usually works well for scans, page previews, and website photos.
Choose PNG when you need crisp screenshots, flat graphics, transparent backgrounds, or images with sharp text edges. PNG can be larger, but it avoids some JPG artifacts.
Choose PDF when you need one file with one or more pages. PDF is best for applications, invoices, reports, forms, and documents that should print consistently.
Convert only when the destination requires it. A PDF should not become separate images unless the receiver wants image files. Several images should become a PDF when the receiver wants one document.
Review the output after conversion. Check file size, page order, text clarity, and whether the file opens in the app or portal where it will be used.
Practical tips
For social posts and website photos, JPG is usually a practical default because it keeps file sizes manageable.
For logos and graphics with transparency, PNG is usually the safer choice.
For forms and multi-page paperwork, PDF is usually the cleanest choice because it keeps pages together.
If an image is too large, resize it before upload. If a PDF is too large, compress it instead.
Common mistakes
Do not use a PNG for every image just because it sounds higher quality. It can create unnecessarily large files.
Do not send separate JPGs when the recipient expects one PDF attachment.
Do not convert a PDF to image format if you need clickable links, searchable text, or form fields.
A practical format checklist
Ask three questions: Is it one image or multiple pages? Does the receiver require a specific format? Does text need to stay selectable? These answers usually point to the correct file type.
When in doubt, keep the original and create a copy in the requested format. That gives you flexibility without losing the best source file.
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FAQ
Is JPG smaller than PNG?
Often yes for photos, but size depends on dimensions and image content.
Can I put JPG and PNG into one PDF?
Yes. Use a JPG to PDF tool that also accepts PNG images.
Which format is best for uploads?
Use the format requested by the upload form. If several are accepted, choose based on document or image needs.
Which format keeps transparency?
PNG supports transparency. JPG does not.
Which format is best for printing documents?
PDF is usually best for documents that need predictable printing.