Compress images client-side with no server upload. Adjust quality, max width, and output format. Compare before/after and download compressed images.
A quick decision brief for this specific tool
One JPEG, PNG, or WebP file plus browser encoder quality, maximum pixel width, and JPEG/PNG/WebP or source-format output
Measured original/output bytes and dimensions, a before/after preview, honest larger-or-smaller comparison, and a downloadable re-encoded file
The browser decodes the image, proportionally resizes to rounded whole pixels when requested, draws to Canvas, and measures the actual encoded Blob instead of predicting file size
Choose your path
Privately re-encode one supported image, optionally resize it proportionally, compare measured output, and download only after visual and byte review.
Reduce a large image without trusting a fabricated savings estimate.
Upload a JPEG/PNG/WebP, select maximum width/format/quality, and inspect actual bytes, dimensions, and preview.
Can download a tested asset and recognizes that encoder quality is not a target file size.
Process a file without sending it to a remote image optimizer.
Use the local file control and review the browser-processing disclosure.
Understands decoding/re-encoding happens in the page while device/browser trust and local download handling still matter.
Avoid accidental transparency, metadata, or format loss.
Compare source/output format, use PNG when transparency is required, and review the before/after preview.
Knows JPEG flattens transparency to white, re-encoding normally strips metadata, and the original must be kept until output is checked.
This tool is part of these guided projects. Each project provides step-by-step instructions with checklists and all the tools you need in one place.
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Uses the HTML5 Canvas API to re-encode images at the specified quality level, leveraging browser-native compression algorithms.
Reports the browser-produced Blob size and output pixels after re-encoding. It does not promise that a lower quality setting will reach a target size or remain visually acceptable.
Decoding, Canvas drawing, and encoding occur in the page on the user's device. Large images can consume substantial memory or make the interface temporarily busy.
Updated: August 2026
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Re-encode one JPEG, PNG, or WebP directly in your browser, optionally resizing it while preserving proportions. Compare actual bytes and dimensions before downloading; the tool never predicts a guaranteed saving from a quality percentage.
