Compressing a JPEG photo
A 4.2MB JPEG photo re-encoded at 80% quality typically drops to under 1MB with very little visible difference at normal viewing size.
Image compressor
Upload an image and drag the quality slider — this tool re-encodes it in your browser with Canvas’s toBlob and shows the real before-and-after file size, no guessing. JPEG and WebP genuinely shrink at lower quality settings; PNG is a lossless format, so its “compression” here is honestly a re-encode that can still trim the file, not a quality reduction. Nothing you upload ever leaves your browser.
Output format
Before / after
Upload an image to see the before/after size here.
How to compress an image
- Choose an image. Click the upload area and pick a JPEG, PNG, WebP or GIF file from your device.
- Pick an output format. Choose JPEG or WebP for adjustable lossy compression, or PNG to keep it lossless.
- Drag the quality slider. Lower the quality to shrink a JPEG or WebP further, watching the size update live.
- Compare before and after. Check the original and compressed file sizes shown side by side under the preview.
- Download the compressed file. Click download once you are happy with the size and visible quality trade-off.
Worked examples
Re-encoding a PNG screenshot
A 900KB PNG screenshot re-encoded through the tool often comes out two or three hundred kilobytes smaller, purely from a cleaner re-encode, since PNG has no quality slider to lower.
Image compressor FAQ
- Does PNG compression actually reduce quality?
- No — PNG is lossless, so the quality slider is disabled for it; the tool only re-encodes the file, which can still shrink it somewhat.
- What quality setting should I use for JPEG?
- Around 70 to 85 percent usually balances a visibly small file size against no noticeable loss of detail for most photos.
- Is WebP better than JPEG for compression?
- WebP often produces a smaller file than JPEG at the same visual quality, though not every platform accepts a WebP upload.
- Does this tool change my image’s dimensions?
- No — compression only re-encodes the pixels at the same width and height; use the resizer tool if you also need different dimensions.
- Is my image uploaded to a server to be compressed?
- No, the entire compression process runs locally in your browser using the Canvas API, with nothing sent anywhere.
- Why did my compressed file end up larger?
- This can happen at a very high quality setting on an already well-compressed source file; try a lower quality value or a different format.
- Can I compress a GIF with this tool?
- You can upload a GIF, but the output is a single still frame in your chosen format, not an animated result.
Ready to broadcast everywhere?
Sign up free — no credit card. You land on the Free plan, and you can start a one-time 7-day Studio trial from your workspace whenever you are ready. Connect your first accounts, import a batch, and watch one post fan out across every platform.