Image Size ReducerReduce image size online.
Reduce image size online.
No account needed.
Compress JPEG, PNG, WebP, and SVG images for web, email, or social media. Everything runs in your browser — nothing uploaded.
Free · No account · Supports JPEG · PNG · WebP · SVG
No upload100% privateFree forever
Processing securely on your device — no data sent to any server
Drop your images here
JPG · PNG · WebP · SVG
Privacy Note: We use your browser's hardware to process this file. Your image stays on your computer throughout the entire process — nothing is transmitted.
No upload·100% private·Instant
How it works
Three steps. Under 10 seconds.
Drop your image
Drag any JPEG, PNG, WebP, or SVG onto the zone or click to browse. No file size limit.
Adjust quality
The slider controls how aggressively image data is discarded. Quality 80 is a good starting point.
Download the result
Your browser compresses locally. Compare sizes before downloading. No data leaves your device.
Why does image size matter?
A photo from a modern smartphone is often 4–10 MB. While excellent for printing, it is far more than needed for web use, email, or social media — and sending oversized images creates friction at every step.
Reducing image size eliminates that friction: images attach to emails without rejection, upload to platforms without errors, load faster on web pages, and transfer more quickly over mobile networks.
- Email attachments. Gmail limits attachments to 25 MB; Outlook.com to 20 MB; many corporate mail servers to 10 MB. A 2 MB image is universally easier to send than an 8 MB original.
- Website uploads. WordPress, Squarespace, and most CMS platforms have upload size limits (often 2–10 MB). Reducing image size before uploading avoids rejected uploads.
- Social media. Instagram, Facebook, and LinkedIn recompress images on upload. Uploading a pre-compressed image gives you more control over the final quality.
- Messaging apps. WhatsApp compresses images automatically, often significantly. Sharing a pre-compressed image preserves more detail than letting the app crush it.
- Web performance and SEO. Google uses page speed as a ranking factor. The largest images on a page directly affect Largest Contentful Paint (LCP). Smaller images improve your search ranking.
- Cloud storage management. If you back up photos to Google Photos, iCloud, or Dropbox, reducing sizes before backup can save gigabytes of storage over time.
How to get the best results.
- For photos (JPEG, WebP): start at quality 80. If the result looks identical to the original, try 70. Most people cannot see a difference between quality 75 and 100 on screen.
- For graphics, logos, and screenshots (PNG): the compressor uses colour quantisation. Start at quality 80 for transparent PNGs; you can often go lower for solid-colour graphics.
- If you need the absolute smallest file and format is flexible, try converting to WebP — it almost always produces smaller files than compressed JPEG or PNG.
- Always keep the original file. Compress a copy. Lossy compression is irreversible.
Privacy by architecture
Your files never leave your browser.
Most online tools upload your file to a server, process it remotely, then send it back. This tool is architecturally different: compression runs via WebAssembly on your CPU. There is no server that receives your image. Not even temporarily.
- No file data transmitted over the network at any point
- No account, sign-in, or email required to use any feature
- Closing the tab clears all data from browser memory completely
- Open-source processing: Canvas API and pngquant WASM
FAQ
Frequently asked questions
How much can you reduce image size without losing quality?
For JPEG and WebP images, you can typically reduce file size by 60–80% at quality 75–85 with minimal visible quality loss at screen sizes. PNG can be reduced by 40–70% using colour quantisation. The quality slider lets you find the right balance.
What is the difference between reducing image size and resizing an image?
Reducing image size (compression) makes the file smaller in kilobytes while keeping the same pixel dimensions. Resizing changes the pixel dimensions — the canvas size — which also makes the file smaller but changes how large the image appears. For web performance, you often want both: resize to the correct display dimensions, then compress to reduce the file size further.
Which format gives the smallest file size?
WebP typically produces the smallest files — 25–35% smaller than JPEG and 25% smaller than PNG at equivalent quality. If you are not restricted to a specific format, converting to WebP will give you the smallest file.
Is my image uploaded to a server?
No. All compression happens in your browser using the Canvas API and pngquant WASM for PNG. Your file never leaves your device.
Can I reduce multiple images at once?
Yes, with no batch limit. Drop as many files as you need — all processing runs locally in your browser.
Does reducing image size change the pixel dimensions?
No. This tool reduces file size in bytes only. A 4000×3000 pixel image remains 4000×3000 pixels after compression. To change pixel dimensions, use the Resize Image tool.
What quality setting should I start with?
Quality 80 is a good starting point for most images. At quality 80, JPEG and WebP files are typically 50–70% smaller than quality 100 with no visible loss at screen sizes. If the result looks identical to the original, try lowering to 70.
Can I preview the quality before downloading?
Yes. Each file card shows original and compressed sizes with the percentage reduction. Click the image preview to open the before/after comparison slider and compare quality before downloading.
Related tools
More tools you might need.
Compress ImageReduce JPEG, PNG, WebP and SVG file sizes by up to 90% — all in your browser.
Compress JPEGReduce JPEG file sizes with fine-grained quality control. Fast, free, private.
Compress PNGShrink PNG files by up to 80% using pngquant quantisation — no upload.
Resize ImageResize to exact pixel dimensions or scale by percentage — aspect ratio lock included.