How to Compress Images for DSLR Photos on iPhone

Updated February 17, 2026 · 7 min read

You do not need an app to shrink photos on an iPhone. Camera JPEGs straight off the card can be many megabytes each, which is heavy for sharing or web use.

Recommended settings for DSLR photos

SettingStarting point
FormatJPEG (WebP where accepted)
Widthabout 3000 px on the long edge
Quality85
File size1000 KB or less

These are practical defaults. If the platform or form you are using publishes its own limits, follow those instead.

How to Compress Images

Open Safari, visit TheCompressJPEG and tap the file picker. Choose photos from your library; iOS will hand them over as JPEG even if they were shot in HEIC.

Set the target to 1000 KB or a maximum width of 3000 pixels, tap Compress, and save the result to Files or Photos. Everything stays on the phone, which matters for personal pictures used for DSLR photos.

Step by step with TheCompressJPEG

  1. Open the compress JPEG to 1 MB tool, or the main compressor for custom settings.
  2. Drop in your image. Nothing is uploaded; it is processed in your browser.
  3. Set the maximum width to 3000 and the target size to 1000 KB.
  4. Press Compress, check the result and download it.
Ready to try it? Compress your JPEG to 1 MB now. It's free and private.

Quick tips

  • Check the result on a phone, where most people will see it.
  • Use consistent dimensions for a set of related images.
  • Resize before you compress; it improves quality at any file size.
  • Write a size limit slightly below the stated maximum to leave a margin.

FAQ

Will compressing reduce image quality for e-learning courses?

Some detail is removed, but at sensible settings the difference is not visible at normal viewing size.

How do I compress many images for e-learning courses at once?

Drop all of them into the tool together and use Download all to get a single ZIP.

What JPEG quality should I use for e-learning courses?

Quality around 78 keeps photos looking natural while cutting file size substantially.

Wrapping up

For DSLR photos, the reliable recipe is simple: resize to around 3000 pixels, compress at quality 85 or to a 1000 KB target, and check the result before you upload. Keep the original so you can always start again.

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