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. Drop a JPG, PNG or WebP file into the tool above, type a new width in pixels (or pick a scale like 50%) with the aspect ratio locked, then download the result. Fewer pixels also means a smaller file, so cutting dimensions is the fastest fix for an image that is still too large after compression. Decoding and resizing happen on your device, so nothing is uploaded and there is no limit on how many images you can run.
What it does
Reduces pixel width × height and the resulting file size
Exact pixel width/height, or a scale from 5% to 200%
File size targets
20KB, 50KB, 100KB, 200KB, 500KB or 1MB, hit by binary search
Aspect ratio
Locked by default; unlock it to force both width and height
Batch
No quota. Dozens of images at once, downloaded as one ZIP
Max input
Roughly 40MB per image, bounded by your device memory
Privacy
Zero uploads. Runs on the HTML5 Canvas in your own browser
Price
Free. No account, no watermark, no daily cap
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.
Set any photo to exactly 1920 × 1080 pixels — the Full HD standard for wallpapers, video thumbnails and presentation slides. Keep the aspect ratio and the tool letterboxes the extra space, or unlock the ratio to stretch and fill the frame. No upload, runs in 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 JPG · Width 1920px · Quality 85% — 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.
Make any photo a perfect 1080 × 1080 pixel square for Instagram posts. Instagram downsizes and re-encodes uploads, so 1080px is the sharpest you can ship and anything bigger just costs bandwidth. The tool fits your image inside the square and fills the rest with a colour you choose.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Width 1080px · Quality 85% — 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.
Resize an image to exactly 1280 × 720 pixels — the size YouTube displays thumbnails at and recommends for uploads. Because thumbnails appear tiny on most screens, designing at 1280 × 720 keeps text and faces readable. Runs entirely in your browser, no upload.
1. Open the tool, then drop your JPG, PNG or WebP files (or click to browse).
2. The settings are already applied — Output JPG · Width 1280px · Quality 85% — 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.
Squeeze any JPG, PNG or WebP under 20KB for application systems that reject anything larger. The tool picks the highest quality that still fits 20KB, and only shrinks the pixel dimensions when quality alone cannot get you there. Batch uploads work the same way.
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 20 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 an image under 50KB while keeping the original pixel dimensions wherever possible. 50KB is the default ceiling on many government and university upload portals, so this preset exists to hit that number exactly without guesswork. Runs locally, so your ID photo never leaves your device.
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 50 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.
Convert JPG to PNG online for free. Because PNG is lossless, the conversion preserves every pixel of your JPG with no extra quality loss — perfect when you need a lossless master or a transparent-ready file. Everything runs locally in 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 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.
Convert PNG to JPG online for free and cut file size dramatically. JPG compresses far more than PNG, so a PNG photo often shrinks by 50–90%. Transparent areas are filled with a background colour you choose. All processing is local.
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.
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
YouTube thumbnail
1280 × 720 px
16:9, 2MB max, JPG or PNG
Instagram square post
1080 × 1080 px
1:1, sharpest at this size
Instagram portrait post
1080 × 1350 px
4:5, takes more feed space than square
Instagram story / Reel
1080 × 1920 px
9:16 full screen
Open Graph share card
1200 × 630 px
Facebook, LinkedIn and X preview
Website hero banner
1920 × 1080 px
Full-width desktop visual
Blog / article image
1200 × 675 px
16:9, crisp on retina screens
Amazon / Etsy product photo
2000 × 2000 px
2000px enables zoom; 1000px is the floor
Shopify product photo
2048 × 2048 px
Square, 20MB cap
US passport / visa photo
600 × 600 px
2 × 2 in at 300 DPI
UK / EU ID photo
413 × 531 px
35 × 45 mm at 300 DPI
LinkedIn profile picture
400 × 400 px
Renders sharp at every display size
Avatar / form upload
200 × 200 px
Small enough for a 20KB budget
Email signature logo
320 × 120 px
Safe width in every mail client
Reducing image dimensions — FAQ
How do I reduce image dimensions online?
Drop a JPG, PNG or WebP file into the upload area, open the dimensions panel, then type a new width in pixels. The height follows automatically because the aspect ratio is locked. If you would rather think in percentages, pick a scale such as 50% instead. The preview shows the new pixel dimensions beside the new file size within about a second, and you download from there. No upload, no account, nothing to install.
What is the difference between image dimensions and file size?
Dimensions are the pixel width and height, like 1920 × 1080 px. File size is what the encoded file weighs on disk, in KB or MB. They move together but they are not the same thing. Halving the dimensions removes roughly three quarters of the pixels and usually shrinks the file dramatically, while compression lowers the file size without touching the dimensions at all. This tool controls both.
How small can I go before the image looks bad?
Match the size to where the image is displayed. A blog column that renders at 800px does not need a 4000px photo, and the extra pixels cost you nothing but bandwidth. Going below roughly twice the display width is where you start to see softness on retina screens. Downscale in one step rather than repeatedly, keep the aspect ratio locked, and export WebP at quality 80 to 85 for photos.
Can I hit an exact file size like 20KB or 100KB?
Yes. Switch the compression mode to Target size and choose 20KB, 50KB, 100KB, 200KB, 500KB or 1MB. The tool binary-searches the quality range for the highest quality that still fits your budget while keeping your dimensions, and only drops the resolution further if the target is otherwise unreachable. Export JPG or WebP for this. PNG is lossless, so a PNG can only reach a size target by losing pixels.
Can I reduce the dimensions of many images at once?
Drop in as many files as you like, set the width or percentage once, and the same dimensions are applied to the whole batch. Each image keeps its own aspect ratio, so a mixed set of portrait and landscape photos all come out right. Download the batch as a single ZIP. There is no server quota, so the practical ceiling is your device memory.
Are my images uploaded to a server?
No. Decoding, resizing and re-encoding all run locally through the HTML5 Canvas API in your own browser, so your images never leave your device. Once the page has loaded you can disconnect from the internet and keep working. That matters for passport scans, signed contracts and client photos, which is the reason the tool was built this way.
Can I set an exact width and height and ignore the aspect ratio?
Yes. Turn off the aspect-ratio lock and enter both values to force exact dimensions. The image will be stretched to fill them, so edges and faces can distort. Leave the lock on and fill in one field when you want proportional downscaling, which is right in almost every case.
Does reducing image dimensions help page speed and SEO?
It is usually the single biggest win available. Oversized images are the most common cause of a poor Largest Contentful Paint score, and LCP feeds into Google rankings. Moving a 4000px photo down to the 1200px it is actually displayed at can cut transferred bytes by 80 to 90 percent. Exporting WebP instead of JPG saves another 25 to 35 percent 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 will not open, because most browsers cannot decode HEIC through Canvas. Convert those on the phone first, in Settings or by exporting from Photos.
Is this image dimension reducer really free?
Yes. Resizing, format conversion, target-size compression and batch ZIP export are free with no account, no watermark and no daily limit. There is no subscription to sell because the processing runs on your own device, so there is no server bill to pass on.