Reducing image dimensions means lowering the pixel width and height of an image. This guide covers every method — exact pixel width, percentage scaling, exact file size targets and format conversion — all running 100% in your browser.
No upload · 100% local
Pixel-exact dimensions
Batch + ZIP download
What does “reduce image dimensions” mean?
Reducing image dimensions means lowering the pixel width and height of an image — for example turning a 4000 × 3000 px photo into 1920 × 1440 px. To reduce image dimensions here: drop a JPG, PNG or WebP file into the tool, enter a new width in pixels (or pick a scale such as 50%) with the aspect ratio locked, then download the result. Fewer pixels also means a smaller file, so reducing dimensions is the fastest way to shrink an image that is still too large after compression. Every image is resized locally in your browser — nothing is uploaded, there is no sign-up, and there is no limit on how many images you can process.
What it does
Reduces image dimensions in pixels (width × height) and the resulting file size
Exact pixel width/height, or a scale percentage from 5% to 200%
Aspect ratio
Locked by default — enter one side and the other is calculated
File size control
Quality slider (1–100%) or an exact target of 100KB / 200KB / 500KB
Batch limit
No quota — dozens of images at once, downloaded as one ZIP
Max file size
About 40MB per image, limited only by your device memory
Privacy
Zero uploads — decoding and resizing run on the HTML5 Canvas in your browser
Price
Free, no account, no watermark, no daily limit
Reduce image dimensions in the same 3 steps
No matter which tool you open, the workflow is identical — upload, set the new pixel dimensions, download. Each tool page only pre-fills the settings for you.
1
Drop your images
Drag & drop JPG, PNG or WebP files, or click the zone to browse. Batch upload is supported and nothing is uploaded to a server.
2
Set the new dimensions
Enter a target width in pixels or pick a scale such as 50%, keep the aspect ratio locked, then choose the output format and quality or an exact target file size.
3
Compare & download
Check the before/after preview with the new pixel dimensions and saving ratio, then download one file or the whole batch as ZIP.
Reduce image dimensions (pixel width & height)
Set an exact pixel width or scale the image by percentage, with the aspect ratio locked by default. This is the most effective way to shrink an oversized photo.
Reduce image dimensions to 1920 px wide with the aspect ratio locked, then export as WebP — the recommended pixel size for hero banners and full-width website visuals. Fewer pixels means a much smaller file, and every image is resized inside your browser.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output WebP · Width 1920px · Quality 82% — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Cut the pixel width and height of any image in half — a 4000 × 3000 px photo becomes 2000 × 1500 px, removing about 75% of the pixels. Ideal for building thumbnails or shrinking oversized uploads, with unlimited batch processing.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output WebP · Scale 50% · Quality 82% — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Bring files under a fixed KB budget — perfect for upload forms, ID photos and email attachments. Dimensions are only reduced further if the target cannot be reached otherwise.
Automatically searches for the quality setting that brings any image under 100KB, and reduces the image dimensions further only if the target still cannot be met — perfect for online registrations, profile photos and form uploads.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Target 100 KB — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Bring images under 200KB while keeping the original pixel dimensions intact — ideal for blog visuals, product photos and email attachments where resolution still matters.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Target 200 KB — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Bring DSLR and smartphone photos under 500KB with virtually no visible quality loss. Combine it with a smaller pixel width when a high-resolution photo is still heavier than you need.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Target 500 KB — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Built for online application systems: always exports JPG, stays strictly under 100KB, and lets you set an exact pixel width first when the form also limits image dimensions. Batch processing supported.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Target 100 KB — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Switch between JPG, PNG and WebP to squeeze out extra bytes once the dimensions are right. WebP is usually 25%–35% smaller than JPG at the same perceived quality.
Convert PNG to WebP in one click — typically 30%–70% smaller with full transparency preserved. Add a target width if you also want to reduce the image dimensions in the same pass.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output WebP · Quality 82% — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Convert JPG / JPEG to next-generation WebP and save 25%–35% bandwidth at the same perceived quality. Pair it with a reduced pixel width for the biggest Core Web Vitals win.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output WebP · Quality 80% — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Convert WebP back to the universally supported JPG format. Transparent areas are filled with the background colour you pick, and you can reduce the image dimensions in the same step for office software or printing.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Quality 88% — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Convert WebP to lossless PNG with the alpha channel fully preserved — ideal for design assets you still need to edit. Set a target width first if the PNG dimensions also need to come down.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output PNG · Quality 100% — so you can adjust only if you want.
3. Compare the before/after preview and download a single file or the whole batch as ZIP.
Match the pixel dimensions to where the image is displayed. Anything larger than twice its display width only wastes bandwidth.
Where the image is used
Recommended dimensions
Why
Website hero banner
1920 × 1080 px
Standard full-width desktop visual
Blog / article image
1200 × 675 px
16:9, sharp on retina screens
Social share (Open Graph)
1200 × 630 px
Facebook, LinkedIn, X preview card
Instagram square post
1080 × 1080 px
1:1 feed image
E-commerce product photo
1000 × 1000 px
Enough detail for zoom
Product thumbnail / grid
600 × 600 px
Fast-loading listing image
Profile picture / avatar
400 × 400 px
Crisp at every display size
ID photo for online forms
413 × 531 px
Common 35 × 45 mm at 300 DPI
Email signature logo
320 × 120 px
Safe width in every mail client
Reducing image dimensions — FAQ
How do I reduce image dimensions online?
Drop your JPG, PNG or WebP file into the upload area, open the "Image dimensions" panel, and either enter an exact width in pixels (the height follows automatically while the aspect ratio is locked) or choose a scale such as 50%. The preview updates in about a second and shows the new pixel dimensions next to the new file size, then you download the image. No upload, no account and no software install is required.
What is the difference between image dimensions and image file size?
Dimensions are measured in pixels (for example 1920 × 1080 px) and describe how many pixels the image contains. File size is measured in KB or MB and describes how much storage the encoded file takes. They are linked but not the same: halving the dimensions removes about 75% of the pixels and usually shrinks the file dramatically, while compression lowers the file size without touching the dimensions. This tool lets you control both at once.
How can I reduce image dimensions without losing quality?
Downscaling is always resampling, so some pixel information is discarded — but visible quality loss can be avoided. Reduce dimensions in a single step rather than repeatedly, never scale above 100%, keep the aspect ratio locked so the image is not stretched, export to WebP at quality 80–85 (visually lossless for most photos) or PNG for flat graphics and screenshots, and only go as small as the space where the image is actually displayed.
What dimensions should I reduce my image to?
Match the display area: 1920 px wide for full-width website banners, 1200 px for blog and article images, 1200 × 630 px for social share cards, 1080 × 1080 px for Instagram posts, 1000 px for product photos, 600 px for thumbnails and 400 px for avatars. A useful rule is to keep the image no more than twice the CSS width it is displayed at — anything larger only wastes bandwidth.
Can I reduce the dimensions of many images at once?
Yes. Drop dozens of files at once, set the width or scale percentage a single time, and the same dimensions are applied to every image in the batch. Each result keeps its own aspect ratio, and you can download the whole batch as one ZIP archive. There is no server quota, so the only practical limit is your device memory.
Are my images uploaded to a server?
No. Nothing is uploaded. Decoding, resizing and re-encoding all happen locally through the HTML5 Canvas API inside your own browser, so your images never leave your device. Once the page has loaded you can even disconnect from the internet and keep reducing image dimensions offline.
How do I reduce image dimensions to fit a 100KB limit?
Switch the compression mode to "Target size" and pick 100 KB. The tool first searches the quality range for a setting that fits the budget while keeping your dimensions, and only reduces the resolution further if the target still cannot be reached. Export as JPG or WebP for this — PNG is lossless, so a PNG can only reach a size target by losing pixels.
Can I set an exact width and height and ignore the aspect ratio?
Yes. Turn off the aspect-ratio lock and enter both width and height to force exact dimensions; the image will be stretched to fit. Leave the lock on and fill in only one field when you want proportional downscaling, which is the right choice in almost every case.
Does reducing image dimensions help page speed and SEO?
Significantly. Oversized images are the most common cause of a poor Largest Contentful Paint score. Reducing a 4000 px photo to the 1200 px it is actually displayed at can cut the transferred bytes by 80–90%, which improves Core Web Vitals, mobile load time and crawl efficiency. Exporting to WebP saves a further 25–35% over JPG at the same perceived quality.
Which image formats can I reduce?
You can open JPG/JPEG, PNG and WebP, plus GIF, BMP and AVIF in newer browsers, and export to WebP, JPG or PNG. HEIC files from iPhones must be converted by the device first, because most browsers cannot decode HEIC directly.
Is this image dimension reducer really free?
Yes. Reducing dimensions, converting formats, target-size compression and batch ZIP export are 100% free with no account, no watermark and no daily limit. There is nothing to subscribe to, because all the work runs on your own device instead of on a server.