How to resize an image on iPhone
To resize an image on iPhone, open Lessr, add your photo, and set the new size — pick a preset like Instagram Square, type an exact width and height, or scale by a percentage. Lessr resizes a copy right on your device and lets you save or share it, so your original stays as it is and nothing is uploaded.
How to resize an image
- Open Lessr and choose Resize Image.
- Add a photo from your library or the Files app.
- Set the new size: pick a preset like Instagram Square or a passport size, type an exact width and height, or scale by a percentage.
- Choose a fit mode — Fit to keep the original shape, Fill to crop to the exact size, or Stretch to force it — and set a quality level if you want.
- Tap Resize, then save the new image to Files or Photos, or share it directly.
Supported formats
Input: Photos: JPEG, HEIC, PNG, WebP.
Output: Photos: JPEG, HEIC, PNG, or WebP.
You can keep the same format or switch formats while you resize.
What you can adjust
- Size method: pick a preset, type an exact width and height (Custom), or scale by a percentage
- Social media presets: Instagram Square, Instagram Portrait, Instagram Story, Facebook Post, Facebook Cover, X (Twitter) Post, YouTube Thumbnail, and LinkedIn Post
- Passport photo presets (US, UK, EU, Indian) and common sizes like HD 720p and 1080p, with 4K on Pro
- Fit mode: Fit to keep the original shape, Fill to crop to the exact size, or Stretch to force the exact size
- Quality level for JPEG, HEIC, and WebP images
When to use Resize Image
Fit photos to social media
Each app expects its own size. Pick a preset like Instagram Square, Instagram Story, or YouTube Thumbnail so your photo posts at the right dimensions instead of being awkwardly cropped on upload.
Passport and ID photos
Sites that require passport or ID photos often demand exact dimensions. The US, UK, EU, and Indian passport presets set the right size in a single tap.
Meet exact size requirements on forms
Job portals and government forms sometimes ask for an image at an exact width and height. Switch to Custom, type the numbers, and resize to match.
Make a large photo smaller
Scale a big photo down by a percentage to make it lighter for email, documents, or web pages while keeping its original shape.
Tips
- Use Fit to keep your photo's shape and avoid stretching; choose Fill only when you want it cropped to fill an exact size.
- Enlarging a small image a lot can look soft — Lessr warns you when a size would upscale, so you can pick a smaller jump.
- To resize and change format at the same time, choose a different output format before you tap Resize.
Frequently asked questions
How do I resize an image to an exact size?
Open Lessr, choose Resize Image, add your photo, switch to Custom, and type the width and height you need. Tap Resize and save the new image to Files or Photos.
What's the difference between Fit, Fill, and Stretch?
Fit keeps your photo's original shape and sits it inside the size you set. Fill crops the photo to fill the exact size. Stretch forces the exact size and can distort the picture.
Can I make a photo larger?
Yes. You can scale up by a percentage or to a bigger size. Enlarging a small image a lot can look less sharp, so Lessr warns you whenever a resize would upscale.
How large can the resized image be?
The free version resizes up to 1080p. Pro raises this to 4K and Original, and adds batch resizing for many photos at once.
How many images can I resize for free?
The free version includes 2 per day, one image at a time. Pro removes the daily limit and adds batch resizing.
Are my photos uploaded, and is my original changed?
No to both. Resizing happens entirely on your iPhone or iPad with no uploads, and Lessr saves the result as a new file while leaving your original untouched.
Resize Image runs entirely on your iPhone or iPad — no uploads, no account, no ads.
Download Lessr on the App Store