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Image Optimizer

Compress locally, then re-decode the output to measure fidelity and verify its metadata containers before export.

Local execution receiptinput path disclosedTool content stays out of MonoTools URLs and API requests.
Working input
Browser memory
Cross-tool handoff
Session only · 10 min
URL payload
Never
Export
Explicit action

Verify it: open DevTools Network, clear the log, use the tool, then inspect fetch/XHR requests. Page assets and optional aggregate analytics may use the network; tool input is not included.

Full privacy model
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How to use

  1. 01Apply a delivery preset or choose a format, encoder, quality or target size.
  2. 02Select a bounded local raster image and adjust the maximum width; changing settings cancels stale work.
  3. 03Review fidelity, metadata proof and the before/after split, then download or pass the optimized file directly into responsive variant generation.
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FAQ

Does it upload images?
No. Analysis, resize, target-size search and export run in browser memory.
Why can the result miss my target size?
If MozJPEG or the native encoder is still too large at minimum quality, reduce the maximum width or raise the target.
Does the quality slider affect PNG?
No. Browser PNG export is lossless, so the tool hides lossy quality controls for explicit PNG output.
Where does MozJPEG run?
The same-origin WASM module runs inside a local Web Worker. Pixels are not uploaded. If Worker or WASM startup fails, the result explicitly reports the browser-native JPEG fallback.
Are SSIM and PSNR measured on the full image?
They use a bounded 256-pixel-edge sample after the encoded output is decoded again. This keeps analysis responsive and is evidence for tuning, not a calibrated perceptual quality certification.
guides

Guides

Image performance7 min read

How to Compress Images Locally in Your Browser

Resize screenshots and photos, choose WebP, JPEG or PNG, and compare the result without uploading the source image.

Read guide →
Image privacy6 min read

How to Remove EXIF and GPS Metadata Before Sharing

Inspect and remove GPS, EXIF, XMP and publishing metadata locally, verify the cleaned image, then recheck the exact public copy after upload.

Read guide →
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