Developer builds browser-only tool to compress images to exact byte size

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A developer built a client-side browser tool to compress images to an exact file size target, such as the 50KB limit enforced by Indian government exam portals, without uploading files to any server. The tool uses a binary search algorithm across JPEG quality values, calling the canvas toBlob API repeatedly to zero in on the largest file that still meets the target. Eight iterations narrow the quality range to roughly ±0.002, completing the process in under a second on a typical phone photo. The developer openly acknowledges current limitations, including an inability to handle cases where even the lowest quality setting produces a file above the target, which requires an additional resolution-reduction step not yet implemented. Issues like canvas aliasing during large downscaling steps and EXIF orientation metadata are also flagged as known gaps in the current implementation.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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