Downscale an Image by Percentage
Shrink any image by a percentage with clean resampling. Set 50% and both dimensions halve — proportions locked, file size down, nothing cropped. Ideal for web pages, email, and upload limits.
2 free credits · No signup · ~10 seconds
Shrink by a percentage instead of guessing pixel dimensions.
Why use this edit tool
Percentages beat guessing pixels
When you only know the image is "too big", a percentage is a far more natural control than a pixel field. Halve it, check the preview, halve it again if needed. You never have to calculate the matching dimension or risk distorting the picture by getting it wrong.
Smaller dimensions, smaller file
File size scales roughly with pixel count, so dropping to 50% removes about three quarters of the pixels and shrinks the file dramatically. That is usually the fastest fix for a page that loads slowly or an attachment that will not send.
Downscaling usually looks better, not worse
Unlike enlarging, shrinking discards information rather than inventing it, and averaging several source pixels into one tends to hide noise and compression artefacts. A downscaled image frequently looks cleaner and sharper than the original did at full size.
Serving images at the size they display
A 4000 px photo shown in a 800 px column still costs the visitor the full download. Shrinking to roughly the displayed size is one of the highest-impact things you can do for page speed, and it is also what Lighthouse means by "properly size images".
Local and private
The resize happens in your browser on canvas. There is no upload step, so no queue, no size ceiling from a server limit, and no copy of your file left anywhere once you close the tab.
Common target sizes
Blog body image
1600 × 900
Double an 800 px column so it stays sharp on retina screens.
Email attachment
1200 × 800
Comfortably under most mailbox limits while still looking good full-screen.
Profile avatar
400 × 400
Crop to square first, then downscale.
Thumbnail
300 × 200
Small enough to load instantly in a grid or list view.
Slide deck image
1920 × 1080
Matches a 1080p projector without wasting file size.
How to downscale an image by percentage
Upload the image
Drop in a PNG, JPG, WebP, or SVG. Everything is processed locally in your browser.
Choose how much smaller
Drag the scale slider from 95% down to 5%. The preview shows the true relative size as you go.
Download
Save the smaller image at its new dimensions as a PNG.
What the tool looks like
When you need it
Faster pages
Stop shipping 4000 px photos into an 800 px layout.
Email attachments
Get under a mailbox size limit without deleting anything.
Upload limits
Forms, forums, and job portals that cap image dimensions or weight.
Avatars and thumbnails
Produce a small, tidy version for a profile or list view.
Documents and decks
Keep a PDF or presentation from ballooning because of full-size photos.
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Frequently Asked Questions
Related Tools
Shrink your image
Pick a percentage and download the smaller version.