A photo straight off a phone or camera can be several megabytes — fine for printing, far too heavy for a website or email. Shrinking it is easy once you understand the two levers that actually control file size: dimensions and compression.
This guide explains the difference, which image format to choose, and how to cut a file dramatically while keeping it sharp to the eye.
What you need
- ✓The image you want to shrink.
- ✓The dimensions you actually need (e.g. 1600px wide for a full-width web image).
- ✓An image compressor/resizer — a browser-based one keeps the photo private.
Step-by-step
- 1
Resize the dimensions first
This is the biggest win. A 4000px-wide photo displayed at 800px is wasting three-quarters of its data. Resize to the largest size you'll actually display before doing anything else.
- 2
Choose the right format
Use WebP or AVIF for the web — they're 25–50% smaller than JPEG at the same quality. Keep JPEG for broad compatibility, and PNG only for graphics with transparency or sharp edges/text.
- 3
Compress with a sensible quality
Export at around 75–85% quality. The eye can't tell it from 100%, but the file is far smaller. Only go lower if you must, and check for blockiness.
- 4
Check it at actual size
View the result at the size it'll appear. If it looks clean there, you're done — don't optimise for a 400% zoom no one will use.
- 5
Strip metadata if privacy matters
Photos carry EXIF data (camera, and sometimes GPS location). Removing it shrinks the file slightly and protects your privacy before you share.
Examples
- A 5 MB, 4032px phone photo resized to 1600px and saved as 80% WebP drops to about 180 KB — a 96% reduction with no visible loss on screen.
- A screenshot saved as PNG at 900 KB re-exported as WebP at ~120 KB, staying crisp because WebP handles both photos and graphics well.
Tips
- →Resize before you compress — reducing dimensions saves far more than quality tweaks alone.
- →Prefer WebP/AVIF for the web; keep a JPEG fallback only if you need old-browser support.
- →Use PNG only for transparency or crisp text/line art — it's wasteful for photos.
- →Keep the original; work on a copy so you can re-export at different sizes later.
- →Strip EXIF/GPS before sharing photos publicly.
Common mistakes
- Compressing without resizing. Shrink the dimensions to what you'll display first — it's the bigger saving.
- Saving photos as PNG. Use JPEG/WebP for photos; reserve PNG for transparency and sharp graphics.
- Over-compressing to a tiny size. Around 75–85% quality is invisible; lower introduces visible blocking.
- Leaving GPS data in shared photos. Strip EXIF metadata before posting images publicly.
Conclusion
Reducing image size is a two-step habit: resize to the dimensions you'll actually display, then compress to a sensible quality in a modern format like WebP. Check it at real size, keep your original, and strip metadata before sharing — you'll cut megabytes with no visible loss.